Blueprint specs.

Mike Taylor 3601 · 09-19-2016, 09:24 AM

deck clearance can be changed from spec, IE spec shows .025'' deck clearance and .016'' thick gasket, which would be a total of .041''. so as a example you could change to .002 deck clearance and .039'' thick gasket and be .041''
As long as distance between piston and head = the spec for deck clearance and gasket thickness combined is legal,always allow .002-.003'' extra to make sure you stay on the legal side.

Mike Taylor 3601

Greg Reimer 7376 · 09-19-2016, 10:33 AM

My 327 calls for .002" tech height and a gasket thickness of .018" for a total deck with gasket of .020". We all know you would NEVER set an engine up that close. It would'nt work over 3000 rpm without clearance issues.This is nothing but a legal minimum. It's OK to have more deck height and gasket thickness than the minimum. Long ago, I built a 283 with a standard bore used block(try finding one now),and after getting the block and the assembly back from the machine shop, I trial assembled it without rings just to see what we had.We had .050"on one bank, .038"on the other, and that was without gaskets. I never remember hearing of the tech team measuring anybody's gasket thickness in a tear down situation. Anybody have their deck height checked,either?

Rsmith38 · 09-19-2016, 11:09 AM

Quote:

Originally Posted by Greg Reimer 7376

My 327 calls for .002" tech height and a gasket thickness of .018" for a total deck with gasket of .020". We all know you would NEVER set an engine up that close. It would'nt work over 3000 rpm without clearance issues.This is nothing but a legal minimum. It's OK to have more deck height and gasket thickness than the minimum. Long ago, I built a 283 with a standard bore used block(try finding one now),and after getting the block and the assembly back from the machine shop, I trial assembled it without rings just to see what we had.We had .050"on one bank, .038"on the other, and that was without gaskets. I never remember hearing of the tech team measuring anybody's gasket thickness in a tear down situation. Anybody have their deck height checked,either?

Yes - Both NHRA and IHRA checked deck height and gasket thickness on my Jeep when I set the records - both were very professional -

Michael K · 09-19-2016, 12:51 PM

Thanks for the replies. The important thing seems to be how NHRA goes about this in a tear down. I wondered why the specifications include the gasket thickness.

Bob Mulry · 09-19-2016, 02:06 PM

Hi,

Just adding some info............................

Measure used and prior compressed gaskets when calculating total deck....

NHRA measures the gasket that was on the engine in the area that was compressed.........

If you measure a NEW gasket that wasn't compressed you will come up short on your desired deck height.....

Gaskets will compress a bunch.....

Just sayin',
Bob

Tom Moock · 09-19-2016, 05:25 PM

Micheal K, Stock only, they also measure on the side of the piston how far down the top ring is on the piston. Tom

09-19-2016, 09:24 AM	#1
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,369 Likes: 349 Liked 293 Times in 101 Posts	Re: Blueprint specs. deck clearance can be changed from spec, IE spec shows .025'' deck clearance and .016'' thick gasket, which would be a total of .041''. so as a example you could change to .002 deck clearance and .039'' thick gasket and be .041'' As long as distance between piston and head = the spec for deck clearance and gasket thickness combined is legal,always allow .002-.003'' extra to make sure you stay on the legal side. Mike Taylor 3601

09-19-2016, 10:33 AM	#2
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,135 Likes: 172 Liked 704 Times in 218 Posts	Re: Blueprint specs. My 327 calls for .002" tech height and a gasket thickness of .018" for a total deck with gasket of .020". We all know you would NEVER set an engine up that close. It would'nt work over 3000 rpm without clearance issues.This is nothing but a legal minimum. It's OK to have more deck height and gasket thickness than the minimum. Long ago, I built a 283 with a standard bore used block(try finding one now),and after getting the block and the assembly back from the machine shop, I trial assembled it without rings just to see what we had.We had .050"on one bank, .038"on the other, and that was without gaskets. I never remember hearing of the tech team measuring anybody's gasket thickness in a tear down situation. Anybody have their deck height checked,either? Last edited by Greg Reimer 7376; 09-19-2016 at 10:36 AM.

09-19-2016, 12:51 PM	#4
Michael K Member Join Date: Nov 2012 Location: Minnesota Posts: 101 Likes: 89 Liked 62 Times in 17 Posts	Re: Blueprint specs. Thanks for the replies. The important thing seems to be how NHRA goes about this in a tear down. I wondered why the specifications include the gasket thickness.

09-19-2016, 02:06 PM	#5
Bob Mulry VIP Member Join Date: Apr 2002 Location: Coarsegold, CA Posts: 1,016 Likes: 57 Liked 320 Times in 102 Posts	Re: Blueprint specs. Hi, Just adding some info............................ Measure used and prior compressed gaskets when calculating total deck.... NHRA measures the gasket that was on the engine in the area that was compressed......... If you measure a NEW gasket that wasn't compressed you will come up short on your desired deck height..... Gaskets will compress a bunch..... Just sayin', Bob __________________ Bob Mulry 7516 STK A & M Motorsports

09-19-2016, 05:25 PM	#6
Tom Moock Senior Member Join Date: May 2004 Posts: 801 Likes: 1 Liked 10 Times in 6 Posts	Re: Blueprint specs. Micheal K, Stock only, they also measure on the side of the piston how far down the top ring is on the piston. Tom __________________ Tom Moock 5704 STK Last edited by Tom Moock; 09-19-2016 at 05:39 PM. Reason: Forgot to add stock only