[Stan Weiss]

Originally Posted by quick67bird

Hey guys I was talking to a guy at work about my car and we were discussing my cam in my engine. He was telling me that the huge solid flat tappet I was running was probably down over a 100 HP from running a similar cam in a solid roller. I know I am losing HP by not using a roller, but I would not think a 100 HP. What do you all think? I am happy with my car for now and won’t change anything till I go turbo, but I am just wondering.

Originally Posted by quick67bird

https://www.chevelles.com/threads/so...tappet.119279/

Here is a post from Harold Brookshire (RIP) from UD posting about this subject.

I looked at that post by Harold and say they are not similar cams.

"They were both 288/296 at .020", 255/263 at .050". The flat tappet was 166/173 at .200", .540"/.556" valve lift. The roller tappet was 176/183 at .200", .626"/.626" valve lift. Both cams used .026" valve lash, hot."

"The only real difference is in the shape of the lift curve. Both cams shut the valve on the seat at the IDENTICAL seating velocity."

My question would be how much difference would there be in HP if I put 1.75:1 rocker arms on the flat tappet cam?

Stan