LT 1 350 valve to piston clearance - Page 2

Chipper Chapman · 01-02-2017, 01:33 AM

I ran .050 on exhaust side in my 350/255. Keep burnout to 5500 or less and never had anything touch, at .040 they do.

Alan Roehrich · 01-01-2017, 02:15 PM

No, it is not legal to cut the valve reliefs on pistons in NHRA Stock Eliminator.

I would probably consider 0.060" piston to valve clearance on the exhaust to be the minimum safe clearance, if it was properly checked to begin with, and you have very good valvetrain control.

01-02-2017, 01:33 AM	#1
Chipper Chapman Member Join Date: Jan 2004 Location: Belmont N.S. Canada Posts: 473 Likes: 246 Liked 166 Times in 71 Posts	Re: LT 1 350 valve to piston clearance I ran .050 on exhaust side in my 350/255. Keep burnout to 5500 or less and never had anything touch, at .040 they do. __________________ Chris Chapman 1969 Chevelle NHRA F-G/SA 1090

01-01-2017, 02:15 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,136 Likes: 1,617 Liked 1,924 Times in 432 Posts	Re: LT 1 350 valve to piston clearance No, it is not legal to cut the valve reliefs on pistons in NHRA Stock Eliminator. I would probably consider 0.060" piston to valve clearance on the exhaust to be the minimum safe clearance, if it was properly checked to begin with, and you have very good valvetrain control. __________________ Alan Roehrich 212A G/S