valve to piston clearance
Posted: Wed Jan 02, 2019 10:27 am
I want to start putting my motor together and I am starting from scratch with a machined 85 ish 302 Roller block stroked to 331.
AFR Aluminum Heads ,Howards cam 221145-10 cam
A necessary check will be valve to piston clearance and push rod length determination.
I have a couple of questions.
FYI I do have an adjustable pushrod length Tool,and will get light weight check springs
1) do I need to temporarily substitute a solid lifter for the hydraulic ones or modify a sacrificial pair of hydraulic ones So that I don't have to worry about the hydraulic lifter compressing and perhaps causing an error in pushrod length? and valve clearance
2) there is lots of different info about clearance .I have seen .125 for both and .125 for exhaust and .060 for Intake.(this is a street motor ) with 380 Hp as a goal
3) do you check 1 piston each bank to ensure the deck heights are machined right? or 4 corners?
4)I kind of know the answer to this one already ,but the Felpro 1011-1 Gaskets specified by AFR is $71 Canadian .Can I use the gasket for clearance checking and then re-use it for final build or should I get on extra to sacrifice for clearance checking?
As always your thoughts are appreciated
AFR Aluminum Heads ,Howards cam 221145-10 cam
A necessary check will be valve to piston clearance and push rod length determination.
I have a couple of questions.
FYI I do have an adjustable pushrod length Tool,and will get light weight check springs
1) do I need to temporarily substitute a solid lifter for the hydraulic ones or modify a sacrificial pair of hydraulic ones So that I don't have to worry about the hydraulic lifter compressing and perhaps causing an error in pushrod length? and valve clearance
2) there is lots of different info about clearance .I have seen .125 for both and .125 for exhaust and .060 for Intake.(this is a street motor ) with 380 Hp as a goal
3) do you check 1 piston each bank to ensure the deck heights are machined right? or 4 corners?
4)I kind of know the answer to this one already ,but the Felpro 1011-1 Gaskets specified by AFR is $71 Canadian .Can I use the gasket for clearance checking and then re-use it for final build or should I get on extra to sacrifice for clearance checking?
As always your thoughts are appreciated