The SBC 302 rod/stroke ratio is 1.9:1. SOUND FOR DAYS. This rod length is also very popular for stroker engines based on either the "B" engines (361, 383, 400) or the RB engines. They're the same old tired, cheap-to-make 4 valve relief, pressed pin, round dish pistons GM has been foisting off on the public since years ago when the drop in CR was mandated. But 383 stroker cranks that use the 400 rod are not that readily available and the rod length-to-stroke ratio is not favorable. This is another thing that's basically accounted for if a 0.040" quench distance is maintained. So, if there is 9.025" available and the stack is only 9.00", that leaves 0.025" space above the piston crown with the piston at top dead center (TDC). The added height from the oil clearance would only be an issue if the engine is being built with a marginal amount of quench (<0.035" for steel rods); if built with the "ideal" 0.040" quench, the oil clearance can be basically ignored. A long, thick tie wrap can be used as a sort of feeler gauge. Planning a stroker build? Application: CHEVY 383 STROKER w/ 350 ROD Press Fit - Rod Bolt Installation [1] Please check the part-number(s) for your application against the part-number(s) listed on the instruction sheet. The stack out will be crank 1/2 stroke 1.9", connecting rod 5.7", Piston 1.425". The exact amount will vary with how much piston to wall clearance there is; more clearance means more piston rock. If desired the oil clearance may be added; easiest way to do this would be to either add the oil clearance to the rod length, or simpler yet, just add the oil clearance after the stack height is calculated. How to Build a 383 Stroker Out of a 350 – 5 Easy Steps to Crack It! However, Ross offers a 383 stroker piston with a 1.120" compression height that doesn't require rail supports. The 6" rod in a 383 will almost always require the oil ring to be in the pin bore since the compresson height has to be so short, but aside from some slightly additional cost, the 6" is … This much piston protruding from the bore would prevent the head from being bolted on, so something has to be changed to shorten the stack height so the parts will fit into the block. West Coast Engines motto is, “do it once, do it right.” The 383 stroker crate engines we build are fully custom, hand-made for your hot rod, American muscle car, or Chevy classic truck! The stroker 383 engine is oversquare as well due to having a larger bore diameter than the stroke. The engine will typically pull more vacuum at low RPM, which means better throttle response and low end torque (good for street performance and everyday driving). The actual compression height of the HT383 piston is presently unknown. For comparisons sake, a stock SBC 350 has a ratio of 1.64:1, and the 6" rod 383 stroker is at 1.6:1. The 400 crankshaft rod journals produce a longer stroke for the engine and create a larger displacement. This combination has been shown to work very well. For quench area a thicker head gasket will have to be used such as a FlePro 0.71 MLS. The 383 stroker not only adds 33 cubic inches over the 350 engines but also has additional torques. So instead of a shorter rod like the 5.565" factory SBC 400 rod, it is preferred to use at least the 5.7" rod combined with a piston made for this application having a compression height of 1.425". This will give a stack out of 9.025". A 9.1:1 compression ratio using a quench of 0.040" will require a 24cc dish. Hello ,Im building a 383 stoker motor!Bottom end is done but have heard several opinions on push rod length and have read some articles to this matter !Some say standard pushrods are fine ,other say to optimize the stoker for what it is you need custom length push rods>I dont want to build this to tear it apart and change push rods im not sure so if any of you … Besides the unwanted change in the rod/stroke ratio causing undue side loading of the piston to the cylinder wall, using a shorter rod can also cause the skirt of the piston to strike the counterweights of the crankshaft at bottom dead center. This measures 9.025" nominal. They will have a much better chance of having enough clearance without any modifications to them or the block. Rod length isn't going to affect piston deck height on a stroker unless you fuck up though. Next, if using a standard 5.7" rod length, use a piston with a 1.560" piston compression height (measured from the centerline of the wrist pin to the top of the piston crown). All kits can be internally … Scat, Balanced Street/Strip Assembly, Chev SB 383, 350 Main, 4.030 Bore, 3.750 Stroke, 2-pc. no with the longer rod the wist pin is higher up on the piton. On the other hand, lower rod ratios do have some advantages. While the HT383 is not that different than many SBC engines, the differences are important ones: The HT 383 pistons are a letdown. Eagle also makes a great cast steel crankshaft internally balanced for lower power applications such as street engines without power adders. However, it is not recommended for high RPM use or power adders such as turbos or nitros. To stroke the SBC 350 to 383 cid requires a 0.030" overbore plus a crankshaft having a stroke of 3.750". 1.740" + 5.703" + 1.560" = 9.00". Another option for increased clearance are small base circle camshafts which are designed specifically to give the additional crankshaft counterweight clearance. A 388 is a 350 block bored +0.060" with a 3.750" crank. K1 Technologies is dedicated to providing world class "energy transfer technology" at an affordable price. It is generally thought that a ratio of 1.5:1 to 1.55:1 is about as low of a rod/stroke ratio that should be used in a performance build that will redline at 5500 rpm or more. This causes one edge of the piston to be a small amount higher than the other edge. Yet another option, although one of the least popular, is to use the stock SBC 400 rod with a 350 SBC piston. Rod length for the same stroke of engine has all to do with the concept of rod angle and the side pressure the piston puts on the cylinder wall. Using a capscrew rod will sometimes be enough, but they still must be checked. ). It's design exceeds the factory specifications for a stock engine and carries the standard bearing sizes. When calculating the stack of parts that make up the reciprocating assembly, use the radius of the stroke, which is the same thing as 1/2 of the stroke, because only 1/2 of the crankshaft stroke swings above the crankshaft centerline. You can go a little tighter than this between the crankshaft counterweights and the block. These pistons have no redeeming qualities, unless you consider the aluminum alloy being hypereutectic a plus. The stack of parts looks like: 1.875" + 5.565" + 1.56 = 9.00". The stroke is increased from 3.48 to 3.75-inch to realize 382.6 cubic inches, commonly rounded off to 383. I have a 69 Z11 with non matching 350. In this article, oil clearance will NOT be added into the stack height. The following article will help the new engine builder to better understand the details involved in building this powerplant. From a HRM article on 383 strokers. A popular parts combo for a 383/388 stroker is the Scat cast steel crankshaft and Scat I-beam forged Pro Stock rods. Shorter rods mean the overall height of the block can be shorter, which means the overall weight of the block can be lighter. The only engine that surpasses it in volume is the production 305 and 350 SBC. Stroker 383 Cu. It produces 340 HP @ 4500 rpm and It produces 435 ft/lb torque at 4000 rpm. For a more detailed discussion, see Quench. They are for use with a factory 5.7" rod or the equivalent. Or it can be a specialty aftermarket crankshaft that has been manufactured with the 350 main journal size that will fit into the 350 block with no machine work at all. 350 SBC piston compression height and piston deck height. (You must log in or sign up to reply here. This will be dead zero deck height on a standard 350 block. A 383 stroker has a 0.030 over bore of the stock 350, giving you 4.030 as a bore diameter. If using the stock SBC 400 rod (5.565"), it will not need any clearancing. The GM small block 5.7-liter 350 is the base for the 383 stroker; the 350 crankshaft is exchanged for a GM small block 400 crankshaft. We have found the thickness of the wire of a paper clip for clearances of the rods on the pan rail is just about right. 383 If using the 3.80" stroke crankshaft this is a must even when aftermarket stroke rods are used. When the piston approaches top dead center, the clearance between the crown of the piston and the underside of the cylinder head diminishes to just short of a collision. A stock’s bore/stock’s ratio, short-stroke 350, with its 3.480 inches of stroke and a broke 4.000 inches, is 1.150:1. Now, we have a choice to make. What is a stroker engine and how does it differ from a standard model? This can be a production SBC 400 Chevy crankshaft with the main journals turned down from 2.65" to 2.45" to allow the 3.750" stroke crankshaft to fit into the main bearing saddles of a 350 block. I went with 6" rods. So, 1.875" + 6.000" + 1.125" = 9.000". It has not one frigging thing to do with detonation. For clearance, I-beam rods are much easier to use than H-beam rods. Nominal piston compression distance for ".000" (zero) deck height appears in the intersecting box. SBC 383 Stroker Kit, Scat 9000 Cast Crankshaft 3.750 Stroke, 350 Main, 5.700 Stroker I-Beam Rods, Mahle Forged -5cc Flat Top Pistons, 1-PC Rear … Rod length mostly affects side loads on the cylinder walls, and piston speeds as they approach TDC and BDC... but you will never notice a difference between those rods in a 383. Common sense will tell you that if you retain the 350's 5.7" rod length and 1.560" piston compression height, that the additional length of the radius of the crank will push the piston out of the top of the bore at top dead center (1.875" stroke radius + 5.7" rod length + 1.560" piston compression height = 9.135"). The radius of the 3.750" stroke crank is 1.875" (3.750" times .5 = 1.875"). Chevy shoots for a 9.0" stack of parts for SBC engines. Most SBC engine builders agree the 5.565" rod/3.75" stroke ratio is borderline unacceptable at 1.48:1. This page has been accessed 130,014 times. If that option does not appeal to you, you can use the 3.80" stroke crank as mentioned above, use a 5.7" stroker clearanced rod and a Sealed Power H859CP Piston which has a compression height of 1.425". So for a stock 350 Chevy having a stroke of 3.48", use 1/2 of the stroke (3.480" times .5 = 1.74") to start putting the stack of parts together that will fit into the block. This is perfect for guys who want BIG sound without losing street driving practicality or reliability. Most often this problem is solved by using a piston having a shorter compression height to compensate for the stroke increase. This puts the piston crown 0.110" above the block deck (remember, an undecked block deck height is ~ 9.025"). Not sure what you want? Discussion in 'Traditional Hot Rods' started by Jenkins Competition, Jan 8, 2021. It wasn’t all that long ago (okay, LBJ was president and Bonanza was a hit TV show so maybe it was a long time ago) that a factory 327 / 350 hp small-block has serious street cred' and Chevy’s 427 making 435 horsepower was boulevard king.Today, it’s a walk in the park to build a … The places for clearance problems between the crank and block is at the bottoms of the cylinders and the pan rails. A 388 can also be achieved by boring a 350 block +0.30" and using a 3.80" crank. The piston deck height is still 0.025" with this combination of parts. The CR is advertised as 9.1:1. In. Another consideration is piston "rock". If it gets caught while checking, no damage. This 9.025" dimension is called the block deck height (or just "deck height"). This crank in a 0.030" over block gives a displacement of 388ci. Now, if we add up all the dimensions of our "stack" components, we find that we have room in the block for them, plus a little extra which will be between the crown of the piston and the block deck. It appears the head gasket is composite and 0.028" thick. To bring the quench down to 0.040" would require a piston CH of about 1.413" (or a head gasket thickness of 0.015"). This space is called the piston deck height (not to be confused with block deck height). For closed-chamber heads (Max Wedge, 915, Stage V … My guess is in most applications either length will work well. This squeezes or "squishes" the mixture that is there, across the cylinder toward the spark plug. The bottom line to all this is it's best to maintain an adequate quench figure of 0.040". Same thing here as was said above, regarding stroker rods. All small block Chevy blocks are manufactured with the same measurement from the centerline of the main bearing bores to the deck where the cylinder heads bolt on. It was my understanding it resulted in a more optimum rod ratio. You may need to do a little grinding on the inside of the block at the pan rail to clear the big end of the rod, but it will be minimal. One way to arrive at a ~0.040" quench distance is to cut the block decks to zero piston deck height and to use a head gasket that compresses to around 0.040". They give a 9.1:1 CR with a 0.028" thickness head gasket and the Vortec chamber size of 64cc. If any metal has to be removed, remove the least amount needed, or else the water jacket could be hit. With the shorter ones you could use lower octane fuel. Now, the stack looks like this: 1.875" + 5.7" + 1.425" = 9.00" with a 0.025" piston deck height. It should be noted that these concepts are based on differing rod lengths using the same stroke (comparing a 5.7-inch rod to a 6.0-inch rod in a 383 ci Chevy 5. There should be a minimum of 0.050" clearance between the parts of the reciprocating assembly and anything else if it's a steel rod engine. Piss off your neighbors, scare the local Honda boys, and … Generally a SBC 383 stroker will have the chance of hitting metal to metal in a three places: This is the most likely place to have interference. Here are a few things you should know before you get started. A nominal dimension is the targeted dimension, the actual dimension may vary a small amount from this, say +/- 0.005". This allows a quench (or squish, or "squench") measurement of 0.040". Grinding on either can be an iffy proposition, so only remove what's absolutely necessary and not a bit more. Stroke is 3.80" instead of the usual 3.75". Putting the 400 crank in the 350 increases the stroke to 3.750. When using steel rods on a street/strip performance engine, having a tight squish of 0.035" minimum to 0.045"-0.050" will allow a high performance street/strip motor to run on pump gas without detonation, providing that all the other important areas are also covered, like the static and dynamic compression ratios. A 383 is a 350 block bored +0.030" with a 3.750" crank. Yeah, my experience is with a 406. Hot rod guys in particular love creating their very own engine, and this interchangeability helps to allow that. by: 1Gary, Cobalt327, Jon, Techinspector1(Click here to edit this page anonymously, or register a username to be credited for your work.). Both much better than the 5.56 rod used in the 400 motors. Spark timing can be advanced a few degrees for some additional low speed torque, and the engine is less prone to detonation, w… I’m starting with a 4 bolt main 350 bored 60 over (numbers are very visible on front so I assume it has not been decked), an after market cast 383 crank, world … RB length rods, are the stock length as originally used by Mopar in the 413, 426 Wedge and 440 engines. The 383/388 SBC stroker has become one of the most popular engines in the history of the small block Chevy. To the best of our knowledge no one has ever laid claim to conceiving the first home-grown 383 by grinding down the mains on a 400 crank to fit in a 350 block with a .030-inch overbore to achieve the original budget stroker combination. The rods that are most likely to be too close to, or to contact the cam are cylinder numbers 1, 2, 5, and 6. The Eagle 10352380057I is a great 3.8" stroke crankshaft for up to around 500 HP. 383/388 Chevy stroker - Crankshaft Coalition Wiki -- hot rod tech … The main complaint about using this combo is the rod length. At TDC as the piston transitions from upward to downward movement, the piston will tip on its wrist pin. Using the quench distance of 0.053", a piston dish size of 21cc would be about right for a 9.1:1 CR. Only if less than 0.035" would this possible be an issue. These rotating assembly engine rebuild kits are designed for street use and include Keith Black forged pistons, Scat 4340 Pro-Comp I-beam rods and a Scat 4340 forged crankshaft.All Scat 4340 cranks are 2-piece rear main seal, internally balanced and weigh approximately 51-55 lbs.These assemblies will require balancing either by us or your machine shop. This high-speed jetting of the mixture not only eliminates any dead spots in the chamber, but also creates turbulence to achieve a more homogeneous mixing of the fuel/air mixture so that there are no lean or rich areas in the chamber. The place where the rod hits is the nut (if a nut and bolt rod big end) or the capscrew. BTW, this has little to nothing to do with making or not making power. THE HOT ROD SPECIAL. When our GMC Sprint damaged the beast of burden stock small block 350, we decided to turn it around with something a little different. Select your connecting rod length in Columns 3, 5 or 7. The rod ratio concern in this case is a matter of frictional losses and side loading caused by a too-short rod more than a horsepower or two possibly gained from a longer rod. Building a stroker is a “no-brainer” for a torquey monster, but we wanted to achieve the extra cubic inches with connecting rod length. Starting on the top-end we have aluminum heads and a lopey sounding COMP camshaft.The bottom end has a Scat or Eagle forged steel crankshaft rated up to 500 HP, forged rods, and hypereutectic pistons with Hastings rings.. On top of the engine is an aluminum intake fed by a Holley carburetor.Get your fuel injection upgrade with a FITech EFI system! The Scat counterweights will clear the pistons using a 5.7" rod and the rods will clear the cam, so no grinding on the rods for cam clearance will be necessary. I want to keep it as original looking as possible with a little more power. Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. A 0.028" gasket using the numbers above will give a quench distance of 0.053". Squish is the high speed jetting of fuel air mixture from the dead zone opposite the combustion chamber. Terms of Service. This 383 stroker crate engine is called “The Growler” for a reason – it GROWLS. Why do you say that? Using a shorter rod is not the desired way to make the change. If the quench is less than 0.040", be sure to double check clearances to be sure there is no contact between the piston and head- for obvious reasons. 383 Stroker Small Block Chevy - Car Craft Magazine - Hot Rod … Some builders prefer not to use a 6" rod, the thinking being because the wrist pin intrudes into the oil ring groove- meaning pinned rings or support rails must be used to allow the oil control ring package to do its job- isn't worth the possible advantages from a higher rod/stroke ratio and/or lighter pistons, etc. More displacement at a reasonable cost. Seal, Flat Top: Chevrolet Small Block 383 Cubic Inch 350 Main 2-Piece Seal 6.000" Rod Length 4.030" Bore Size 3.480" Stroke 11.3:1 w/64cc Compression Using a 6" rod also has advantages if internally balancing is going to be done because there's more room for the crankshaft counterweights. 4. There's nothing to be gained by going tighter, and a 0.040" quench distance will avoid unseen problems for the most part. If you are going to do a rebuild, it does not cost that much more to go to a 383 stroker. Another option is to use a longer 6.00" rod combined with a piston having a 1.125" compression height. OK, you have me wondering. Forged pistons generally have a looser piston to wall clearance than cast pistons, but newer design forged pistons have tighter clearances than was used in days gone by. ARP part number 134-6027 is for a set of rod bolts with additional clearance at their heads to help cam to rod clearance problems. Connecting rod dimensions and construction can make the difference between a reliable racer and one that self destructs at the first sign of abuse. The 383 stroker engine is typically installed in a vehicle to increase horsepower and torque. We decided to add some cubic inches to our small-block for the tried and true 383 stroker build. When the various parts that make up the reciprocating assembly are selected, these parts have to fit into the SBC deck height dimension of ~9.025". you choose pistons with the correct pin height to get the piston top at the right height. Just click the "edit" tab at the top of this page, or click one of the [edit] links to the right of an article section. This engine was introduced in response to the wildly popular SBC 383 stroker engine made popular by backyard mechanics, machine shops, and later in the aftermarket. Privacy Policy. Using a 9.025" block deck height, 3.8" stroke, and 5.7" rods, the piston CH would need to be 1.4” for the stack to equal 9” (1.9 + 5.7 + 1.4 = 9.0). The stroker rods do not require any trimming to make them clear the CAM and the pan rails of the block because the rod bolts enter from the bottom and nothing comes out of the top. Another example using the 3.80" stroke crank (3.80" x .5 = 1.90"). [2] Make sure there is an adequate chamfer around the top of the connecting rod bolt hole to clear the radius under the head of the bolt. KB pistons for a 5.7" rod SBC 383 stroker, https://www.crankshaftcoalition.com/wiki/index.php?title=383/388_Chevy_stroker&oldid=3476443, Heavy-duty powdered metal steel, screwed-in studs, Hypereutectic aluminum, round dish w/4 valve reliefs, 32º BTDC total @ 4000 rpm w/o vacuum advance, Bore is 4.00" instead of the usual 4.030" or 4.060". Four-Cylinder Engines The Chevrolet 2.2L's — also known as the Vortec 2200 — rods have a center-to-center (c-c) length of 5.590 inches, weigh 530 grams and utilize 0.31-inch rod bolts. It uses a 4-bolt block and Vortec iron heads with 1.94" x 1.5" valves and an aluminum dual plenum intake. Using a reduced base circle cam will not necessarily help- the clearances have to be physically checked for all the rods. Confirm stroke length in Column 2. A $200.00 stroker crank, con rods and pistons and machine work and you have a 383 stroker. I’ve read a lot of the threads on here about 383’s and picked up a lot of good information. In a running engine, the oil clearance will create a slightly longer stack- a 0.003" rod bearing oil clearance will add something slightly less than 0.003". This page was last modified on 10 November 2019, at 13:54. Using the stock length rods is not so much of a problem as not using any length stroker rods. Chevy 383 Engine - We Build a Small-Block That Makes 500HP … These are the questions Tony tackles in today's episode of Lincoln Tech tips. Because with a shorter rod you will snap the piston back faster and prevent detonation. It is better to use an aftermarket 'stroker' rod from the get-go instead of having to grind on another type of rod/rod nut to gain enough clearance.
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