piston to valve clearance -- how to know
Staging Lane
Joined: Dec 2001
Posts: 58
Likes: 0
From: Troy, MI
Re: piston to valve clearance -- how to know Before you put the heads on for good, clay the piston crown and bolt the head on. Then turn the engine over by hand. Take the head off and look at the clay. If you see piston through the clay, it'll hit the valve <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> If your really good, you can measure the thickness of the clay to get your clearance...
That's what I did on my '69 Austin Healey Sprite. It's running 12.5:1 Compression with a high lift/long duration cam with higher ratio rockers. It also has .015" piston pop-up. I had to check.
It may be overkill for an LS1 with any sane combo...
Roger <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
<small>[ June 06, 2002, 09:10 AM: Message edited by: rcclass ]</small>
That's what I did on my '69 Austin Healey Sprite. It's running 12.5:1 Compression with a high lift/long duration cam with higher ratio rockers. It also has .015" piston pop-up. I had to check.
It may be overkill for an LS1 with any sane combo...
Roger <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
<small>[ June 06, 2002, 09:10 AM: Message edited by: rcclass ]</small>
Thread Starter
TECH Enthusiast
Joined: Apr 2002
Posts: 588
Likes: 0
From: SC
Re: piston to valve clearance -- how to know Thats great, but say you want to know ahead of time (before you buy everything) if the combination will clear ok.
for example, with 2.08/1.60 ARE S2 heads, will a 230/224 .563/.569 on a 111 LSA clear?
How about a 226/232 .569/.569 112 LSA?
for example, with 2.08/1.60 ARE S2 heads, will a 230/224 .563/.569 on a 111 LSA clear?
How about a 226/232 .569/.569 112 LSA?
