78 Engine rebuild

[mmvette80]

No, but if I ever purchase another Vette it will be a manual.
Im beyond the point of selling it to get a manual. Ive done too much to the car.

 

[Jack]

Jack, How much compression will the cam overlap you mentioned earlier compensate for? If I am at 10:1 and the cam helps a bit.......you said on a earlier post 60 degrees. I am checking to see what I can arrange on the heads. As I said on the email the book I am using says not to bother rebuilding the 624s but at this point I wish I had.
No need to apologize this is my mistake not yours.
Thanks
John

Not much, if any ... your cam has about 52* OL at adv dur ... rather mild.

Your cam (crane 272 / 100052) probably has 1 degree of cam advance ground into it (you may wanna verify w/ crane). Regardless, if you RETARD the cam a coupla cam degrees to minus one degree it will kill some of the CR (estimate 0.5 reduction). It will also kill some of the bottom end giddyup ... but will pick it back up & increase on upper end (where you probably don't/won't use it). By the same token, dialing additional advance into cam will increase CR ... & increase bottom grunt.
JACK:gap