Here's another piston to valve clearance question.............
Is there any way to know how much clearance I have with a particular setup "before" I purchase a new cam for it?
I've seen ways to check clearance - once you have bought everything, but I don't want to spend a small fortune on a roller cam setup and find out the clearance between piston and valve is to close.
I have a 454 block with factory Iron Heads from a 68-70 car. The heads are large oval port type with closed combustion chambers. My pistons are SpeedPro Forged with a .095" dome. Part # 2399F60. I was running a Hydraulic FT cam with about .575 lift for both exhaust and intake (1:7 ratio rockers). Duration was about 245 deg @ .050" lift. No problems with that - never smashed a piston to a valve.
Some of the roller cam setups I'm looking at have lifts of about .600 to .625. That's about .050" more lift than I've been running. Does anybody know from experience if I will be ok with that much lift or is that "pushing it".
Like I said, I dont' want to spend $800 for a roller cam kit with .625 lift and find out the clearance to tight - and then have to return all the parts and start over again.
Maybe I could or could have checked clearance with the old cam and use that as a baseline
The motor is already apart. Block is at the machine shop getting cleaned and honed.
Lee
Is there any way to know how much clearance I have with a particular setup "before" I purchase a new cam for it?
I've seen ways to check clearance - once you have bought everything, but I don't want to spend a small fortune on a roller cam setup and find out the clearance between piston and valve is to close.
I have a 454 block with factory Iron Heads from a 68-70 car. The heads are large oval port type with closed combustion chambers. My pistons are SpeedPro Forged with a .095" dome. Part # 2399F60. I was running a Hydraulic FT cam with about .575 lift for both exhaust and intake (1:7 ratio rockers). Duration was about 245 deg @ .050" lift. No problems with that - never smashed a piston to a valve.
Some of the roller cam setups I'm looking at have lifts of about .600 to .625. That's about .050" more lift than I've been running. Does anybody know from experience if I will be ok with that much lift or is that "pushing it".
Like I said, I dont' want to spend $800 for a roller cam kit with .625 lift and find out the clearance to tight - and then have to return all the parts and start over again.
Maybe I could or could have checked clearance with the old cam and use that as a baseline
The motor is already apart. Block is at the machine shop getting cleaned and honed.
Lee