Originally Posted by shsouthard
Wow thanks to all.. this is alot of good info it will take a bit to comprehend but good none the less. As you can tell I started with a stock 79 L-82 vette some years back the gas mileage was bad so in an atempt to make this affordable to drive I had a friend change the gears in the rear to 308s trying to drop the cruise RPM as it spends most of its time on the highway years later the gas mileage still sucks 12.1 mpg on the last tank. I have a 700R4 laying around so what the heck rebuild it and have it put in. thats were its at now. I guess it is stock the mech said I dont need a shift kit he can do a few things to make it shift good and firm. while I wait my mech say if you want more power find a set of L-31 vortech heads and get 1.6 to 1 roller tip rockers and Edelbrock RPM Performer intake, so I did now looking at putting them on but the stock compression is 8.9 to 1 with 76cc stock heads the average awnser I get on compression with the 64cc heads is 10.2 to 1 so I think my cam will be to small so looking for the right choice wich brings us to this thread. Does anybody have a set up close to this if so what cam do you use ? what type of drive is it ok on bottom cruise good on the highway ?? were would you guys go with all this if it were you?
I think the short book
tech wrote answered all of your questions and then some. You need a bigger cam for that high of compression, a bigger cam requires a taller gear. You can try to get around that but you'll be kicking youself in the *** in the long run. When working with a 50 year old engine there is really no need to reinvent the wheel for this application.