350 rebuild

J

johnnyjaws

Member
hi I have a 1976 c3 corvette it has a 4 speed and a 330 rear or a 308 rear motor has 49000 miles on it and runs good but I want a stronger motor I bought these parts for a rebuild, there new and I can return them if u think it wont work I want low and mid range torque and some top end I live in Hudson valley ny lots of mountain and back roads I have edelbrock e street heads valves 202/ 160 - 64 cc . a comp cams k kit 262-270 duration and 462-469 lift and Harland sharp 1.6 roller rockers I wanted to stay with std bore and going to get rid of the dish pistons and install flat tops with a dome volume of - 5 I got a edelbrock performer rpm air gap intake and I have a 600 4bl Holley carb I had this carb already what do u think your suggestions are greatly appreciated
 
well we can start if you tell me the cam part number, comp cams listed it under, and the cylinder head part number and any and all other info you can give me.
 
ok comp camgrind xe262-h lift in-462 ex-469 duration in-262 ex-270 eldebroke e street heads #5089 64 cc in-2.02 ex-1.60 deck thickness 9/16 valve spring diameter 1.26 installed height 1.750 seat pressure 125 lbs seat at 5.00 lift 320lbs max lift 0.525 stock 1976 350 block bore 4.00 stroke 3.48 speed pro fmp -h345acp-350 sbc flat top pistons coated 5.7 rods stock . piston weight 562 gms compression distance 1.548 dome volume -5 piston ring size 5/64,5/64.3/16 Harland sharp cps #s1002 1.6 3/8 stud roller rockers
 
have you installed long tube headers and a low restriction exhaust yet?
the parts you list will work fairly well for what your trying to do, but a 3.54:1-3.73:1 rear gear and a low restriction exhaust will make the car much more responsive, with those parts.
since your stated goal is increased low and mid rpm range torque Id point out that that the most dependable route is INCREASED displacement.
as a general rule you get about 1-1.2 ft lbs of torque per cubic inch of displacement over much of the engines designed power curve from about 2500rpm-5500rpm with a sbc (obviously components selected effects results)
volumetric.gif

thus a stroker crank added, that increases displacement from 350-383 can easily be worth an additional 35-40 ft lbs of torque over most of the power band.
the reason I point this out is that its usually NOT a great deal more expensive to build a 383 vs the 350

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is a two bolt main ok I heard it was good to 400hp? I would like to use my original block not mantatore if not ill just pull the stock motor and save to sell with car if I ever sell it thank you for all your wise information
 
johnnyjaws said:
....sweet do u use baffles in them
Click to expand...

here once again is where having the ability to weld and fabricate is a huge plus, the factory baffle inserts are very restrictive

the stock inserts cost about $244 for two
http://www.summitracing.com/parts/dou-d950

you could buy some exhaust cone inserts , to use either alone or in pairs or fabricate something similar, or fabricate something similar to the spiral baffles pictured with perforated sheet and tube that would be far less restrictive and more effective
http://www.summitracing.com/parts/dtc-772-32530
exhaustconez.jpg

exhaustcone.jpg

prefor1.jpg


baf2.jpg

most aftermarkets side pipe exhaust baffle inserts are very restrictive, losses of 50-80 peak horse power compared to results with the baffles removed have been documented on dynos
baf1.jpg

baf3.jpg

you can fabricate something far less restrictive, or at least use baffles that are less restrictive

vette153.jpg

you can and really should fabricate a set of spiral baffles from perforated steel tube and sheet, it will significantly reduce any restriction to exhaust
http://www.spiralturbobaffles.com/
94280002_sm.jpg
(something similar to this made from perforated steel tube and sheet, would have far less restrictive and efficient)

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http://www.macsmufflers.co.nz/cs/prodLi ... Category=9

http://www.metalgeek.com/static/cope.pcgi

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