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Topic: 383 stroker conversion

in Forum: C3 Engines

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383 stroker conversion (1/3)
3/31/17 11:23am

Dblancha79

Gold Member
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Weatogue, CT - USA

Vette(s):
1979 C3 L82 383 cu in

Joined: 6/29/2015
Posts: 80

I have been looking into this crank conversion for my 79" L82 350 cu in motor.

Based on the RSR compression ratio calculator it bumps up the ratio to 9.8 to 1 if I leave my current 76 cc heads. Based on the HP calculator for the new compression ratio I don't gain that much HP.

I take it to get to 460 you have to go to a taller cam lift and much smaller cc head?

Has anyone just changed the crank and shorter piston combo and if so what was your actual HP gain?

Thanks

______________

"Made to be run hard"

Simsbury, Ct.

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Re: 383 stroker conversion (2/3)
3/31/17 4:06pm

snake97
Former Member
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Metairie, LA - USA

Vette(s):
1979 Black, Oyster interior purchased in March 1980

Joined: 7/7/2013
Posts: 24

I went with an 18cc dish piston with a 64cc combustion chamber which supposedly comes to 9.8:1. The block was also bored.030 . My heads have 210cc intake ports which are rather large for a street engine. The people I purchased my heads from said the larger cubic inch engine worked better with larger intake ports. I also installed a hyd roller cam, I felt that if the newer engines had them, there was a reason. I also had to get an intake that came close to matching the intake ports, so I got a performer rpm from Edelbrock. I top it off with a quadrajet. I'm not sure of the hp, but from talking to the guys at the tuners in the area, they all guestimate the hp to be in the 425-450 range. My son has a2013 Corvette with an LS3 and I can take him in an 1/8 mile, in the 1/4 he takes me. The new LS's with the 7 speed trans keep pulling. To sum up what I'm saying,the 383 I have is like day and night in performance over the 350. I've had people looking all over my car for nitrous because people don't expect performance from a 79 with a quadrajet. The 383 is a torque monster also. With the big glass window and a full tank of gas the car has a lot of weight over the rear so it hooks up. I've written a lot of info here that you probably don't care about, but this was how I got to the hp range you are looking for and I love it. Also I purchased a cam that makes enough vacuum so all of my lights, brakes, and other vacuum acc. still work.

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Re: 383 stroker conversion (3/3)
3/31/17 7:21pm

Dblancha79

Gold Member
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Weatogue, CT - USA

Vette(s):
1979 C3 L82 383 cu in

Joined: 6/29/2015
Posts: 80

Thanks, Great info.

______________

"Made to be run hard"

Simsbury, Ct.

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