Clearance piston to valve
 

Hi
I need information. On my B/SA 1995 Camaro with LT1. At 101.5 timing, the valve clearance to piston is .018 int and .053 on exh. It is too tight or is normal. If i back the cam at 106, i have 32 int and 36 exh. All with .039 head gasket. what you do with this?

Thank for your help

Re: Clearance piston to valve
 

How are you measuring that ? Light checking spring, or clay, do you have a welded lifter ?

Re: Clearance piston to valve
 

This is Roller Hydro. but I checked the lash with light spring and solid roller lifter. but i have same result with light spring and roller hydro.

Re: Clearance piston to valve
 

what is the total deck, head gasket and piston depth?
Also what is cam ground on?

Re: Clearance piston to valve
 

Mark you have a pm.

Re: Clearance piston to valve
 

deck is .015 gasket .039 total .054.

but i want know?

Have you ever seen this in stock eliminator for a hydraulic roller cam?

Re: Clearance piston to valve
 

Late model LT-1 minimum total deck with gasket is.062" IIRC. Your short .008" and would fail a tear down. I had one and built my own engine and had plenty of clearance with CP pistons and a Bullet cam. That cam was pretty aggressive so it seems odd to me you would have so little clearance.

Re: Clearance piston to valve
 

Same thing I was thinking Rich.

Re: Clearance piston to valve
 

I run with with Fel-Pro 9966 pt the thickness is .049 not .039 (it is my mistake) But it changes nothing to my question.

Rich ... you don't need to swear at me

Re: Clearance piston to valve
 

It's been quite a while since I had that LT-1 Stocker Lee but I do recall doing that engine and being real happy I did not have to worry about a tight P-V issue. Still wish I had one as they are great fun to drive. Not fun to work on! Swear at you ? I don't have a clue as to what that statement means.

Re: Clearance piston to valve
 

To answer your original question: I would not try to run it that close. Closest I have ever run my SS LT1 is .036" intake (I prefer .040") and .065" ex, measured with checking springs, using a dial indicator, not clay.

Re: Clearance piston to valve
 

ghost, Did you check valve clearance with valve springs that you are going race with? you need a solid roller lifter the same height as your hydraulic roller to check cam lift & valve clearance, you will have more valve clearance with heavy springs. Tom

Re: Clearance piston to valve
 

Thanks for your help

tomorow, i check again with my race springs and solid lifters with same height

Re: Clearance piston to valve
 

Doubt race springs will get him enough clearance.

Re: Clearance piston to valve
 

after checking carefully with RACE spring . i have .038int and .065exh at 101.5 timing. Is tight but O.K. for my application

Thank's again

Re: Clearance piston to valve
 

That is close with race springs. Hope it goes well for you.