Piston to valve clearance question?

Smitty · 07-16-2011, 10:26 AM

Guys,

Currently I have an original Cam Dynamics stock eliminator cam in my car. Specs are 519/525 lift and the .050 duration numbers are 250 int and 266 exhaust. The combo runs good, especially for the low lift however I want to run faster.

I have two options for camshafts, they are listed below:

Lunati Solid Roller: 785/785 lift duration @ .050 is 273 int and 283 exh

Ultra Dyne Solid Roller: 722/722 lift, duration @ .050 is 264 int and 271 exh

What I didn't do when I built the engine was write down what my valve clearance numbers where with the hydraulic cam. I know we had a good amount but not sure how much. Basically what I am asking is what matters more in this equation, duration or lift?

Engine is a 351C with closed chambered heads, 61cc's, .450 dome piston, block has not been zero decked.

Any good advice would be appreciated, thanks!

Smitty

07-16-2011, 10:26 AM	#1
Smitty Member Join Date: Jan 2003 Location: Gibsonton, FL Posts: 267 Likes: 0 Liked 1 Time in 1 Post	Piston to valve clearance question? Guys, Currently I have an original Cam Dynamics stock eliminator cam in my car. Specs are 519/525 lift and the .050 duration numbers are 250 int and 266 exhaust. The combo runs good, especially for the low lift however I want to run faster. I have two options for camshafts, they are listed below: Lunati Solid Roller: 785/785 lift duration @ .050 is 273 int and 283 exh Ultra Dyne Solid Roller: 722/722 lift, duration @ .050 is 264 int and 271 exh What I didn't do when I built the engine was write down what my valve clearance numbers where with the hydraulic cam. I know we had a good amount but not sure how much. Basically what I am asking is what matters more in this equation, duration or lift? Engine is a 351C with closed chambered heads, 61cc's, .450 dome piston, block has not been zero decked. Any good advice would be appreciated, thanks! Smitty