Piston to valve

HIGHOCTAIN2000 · 05-25-2015, 12:50 PM

What is the minnium piston to valve clerance you have run, aplication is stocker with auto trans and solid lifter.

Alan Roehrich · 05-25-2015, 01:03 PM

On the intake, I run as little as the piston to head clearance plus 0.010", on the exhaust, I like to see 0.070".

Tom Goldman · 05-25-2015, 05:16 PM

You are my hero Alan ! ...I thought I was brave at .025 !
I do go closer @ .060 on the exhaust though.

Alan Roehrich · 05-25-2015, 05:25 PM

Tom, I've run 0.050" total on a big block intake, at 0.00" deck with a 0.042" Cometic head gasket. I've run tighter than 0.070" on the exhaust, but I know that I have kissed the piston with a valve or two when the exhaust valve bounced on the seat. I know valve bounce can happen, so I won't tell anyone to run tighter than 0.070" on the exhaust. Valve bounce on the intake will not cause a clearance problem, just beats on the valve job and makes Jimmy Bridges chew me out.

Dwight Southerland · 05-26-2015, 08:07 AM

The driver is also a big factor in how close you can get by with.

05-25-2015, 12:50 PM	#1
HIGHOCTAIN2000 Junior Member Join Date: Nov 2007 Posts: 27 Likes: 0 Liked 0 Times in 0 Posts	Piston to valve What is the minnium piston to valve clerance you have run, aplication is stocker with auto trans and solid lifter.

05-25-2015, 01:03 PM	#2
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,913 Likes: 995 Liked 1,040 Times in 272 Posts	Re: Piston to valve On the intake, I run as little as the piston to head clearance plus 0.010", on the exhaust, I like to see 0.070". __________________ Alan Roehrich 212A G/S

05-25-2015, 05:16 PM	#3
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,436 Likes: 776 Liked 700 Times in 204 Posts	Re: Piston to valve You are my hero Alan ! ...I thought I was brave at .025 ! I do go closer @ .060 on the exhaust though. __________________ Tom Goldman 1500 SG , 1506 STK

05-25-2015, 05:25 PM	#4
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,913 Likes: 995 Liked 1,040 Times in 272 Posts	Re: Piston to valve Tom, I've run 0.050" total on a big block intake, at 0.00" deck with a 0.042" Cometic head gasket. I've run tighter than 0.070" on the exhaust, but I know that I have kissed the piston with a valve or two when the exhaust valve bounced on the seat. I know valve bounce can happen, so I won't tell anyone to run tighter than 0.070" on the exhaust. Valve bounce on the intake will not cause a clearance problem, just beats on the valve job and makes Jimmy Bridges chew me out. __________________ Alan Roehrich 212A G/S

05-26-2015, 08:07 AM	#5
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 1,980 Likes: 53 Liked 724 Times in 177 Posts	Re: Piston to valve The driver is also a big factor in how close you can get by with. __________________