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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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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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Thanks, Great info.
"Made to be run hard"
Simsbury, Ct.
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in Forum: C3 Engines, Driveline and Handling
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