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Old 04-01-2012, 05:06 PM
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496 stroker setup

hi i just needed some help with choosing parts for my stroker build this is my first big block build i need help finding out my compression ratio and if i should use a different set of heads so here are the parts so far 4.250 stroke crank with 6.385 length rods with flat top pistons +3cc 4.31 in bore the head i was looking at are the brodix bb2 heads they have 119cc combustion chamber with a intake runner volume of 340 havent decided on the cam yet was thinking bout either the comp cam 11-213-3 which has an advertised duration of 292/292 and lift of .550 or the comp cam 11-214-4 which is 305/305 with.575in lift i will also be using comp 1.72 ratio rockers this engine is for a street car with some strip so i need it to stay on pump gas plan on later maybe adding the bottle to it also what size/type carb do yall think i should use thank you

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Old 04-01-2012, 06:05 PM
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I build a few of these and find a piston with a short dome is better and brings the compression to near 10-1. The 340 is too much intake runner for a lower compression engine. You need to keep port velocity up. 280-300 is plenty. Go with as much lift as you can. Big blocks love lift..
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Old 04-01-2012, 06:30 PM
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i thought the 340 intake flow was going to be a problem do you know of a good aluminum head in the flow range your talking about and thank you for your reply
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Old 04-01-2012, 06:36 PM
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i would use an oval port head if its going to be a street/strip car
whats everything else?
car, gears, trans etc.etc.etc.
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Old 04-01-2012, 07:12 PM
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so oval ports are better for the street than a square port will have to check into some oval port heads than it will be going in a 86 monte carlo ss with a 4l80e manual valve body and i havent decided on the geres yet was thinking either 373 or 355 gears do you have any opinions on the carb size i should go with
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Old 04-01-2012, 08:26 PM
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ProComp oval port or their clones. These are great street heads.. Let the naysayers go on. But, I've used them for years, on my and customers engines and had "0" problems with them.. I use Manley valves and springs/retainers from Comp products in Wisconsin.

One of the earliest 496 engines I built is now on its third freshen (had to go .070 over). Built early 2004. It has been in four different bodies. Street raced big time. Drag raced several times a season. Just an all around great reliable power maker. JE pistons short dome. 6.385 H-beam rods. Std weight steel crank. .660-.685 roller cam. Old Holley strip dominator intake. 850 vac secondary carb in street duty and a 850 double pumper for competition.

The Know it alls mock the old intake and the vac carb. But, they see taillights most of the time and the thing is easy on engine parts.. Driveline is a different story.. Thats why the different bodies/chassis.
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Old 04-01-2012, 09:52 PM
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I myself have been looking into building a 496 for my 67 camaro.. upon some research i found Probe piston has a 18cc dome CH 1.270 for a 6.385 rod.. with the 18cc dome and a 115-119cc combustion chamber with around a .045 quench gives about a 10:1 to 10.5:1 SCR which is good street compression.. A 300-320 cc intake runners are plenty for the 496.. 340 way to big IMO.. your better to run the smallest intake runner possible without choking the motor. for a street/strip.. A 305cc polished ports with 2.25/1.88 valves would be a good combo imo..The smaller ports will keep the low rpm air speed higher which results in goos street maners and good torque.. I found a good roller setup from Lunati that i think would work very well on the street and good strip manners too.. Voodoo roller# 60234 or a Flat tap solid # 402A5LUN.. remember as cubs go up the rpm ranges for some of these cams go down a bit as most are base on 396-454..

hope this helps
JP
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