CLASS RACER FORUM - Decking block

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Kdw1403

11-03-2016 05:50 PM

Decking block

is it legal to zero deck a lt1 350 for stock eliminator? If not how much in the hole do I need to leave the piston.

richie 2

11-04-2016 04:59 AM

Re: Decking block

I doubt it...nhra/ihra have that spec. & required head gasket thickness listed...

Rich Biebel

11-04-2016 07:42 AM

Re: Decking block

Total deck with gasket IIRC is .062"

If you had a zero deck you'd need a .062" thick gasket....

That's for a late model EFI LT-1...

The old LT-1's probably have a total deck number that would not be safe to run.....

Billy Nees

11-04-2016 07:54 AM

Re: Decking block

Quote:

Originally Posted by Rich Biebel (Post 518943)

If you had a zero deck you'd need a .062" thick gasket....

And with the way that a head gasket usually overhangs the bore, the hot lick is to use the thinnest head gasket that you can and more negative deck.

Dwight Southerland

11-04-2016 10:38 AM

Re: Decking block

Quote:

Originally Posted by Billy Nees (Post 518946)

And with the way that a head gasket usually overhangs the bore, the hot lick is to use the thinnest head gasket that you can and more negative deck.

Really??

Billy Nees

11-04-2016 12:03 PM

Re: Decking block

Quote:

Originally Posted by Billy Nees (Post 518946)

And with the way that a head gasket usually overhangs the bore, the hot lick is to use the thinnest head gasket that you can and more negative deck.

I guess THAT didn't come out right.
And the way the head gasket usually IS LARGER THAN THE BORE IN DIAMETER, ETC.ETC.ETC.

Rich Biebel

11-04-2016 01:21 PM

Re: Decking block

Yes that's better Billy....

Ed Wright

11-04-2016 03:26 PM

Re: Decking block

What Billy said. Second time. LOL

Mark Yacavone

11-04-2016 03:49 PM

Re: Decking block

You want to order the gasket bore size AFTER you do the valve job...in the new NHRA.

Billy Nees

11-04-2016 05:38 PM

Re: Decking block

I can always count on my buddys to keep me on the straight and narrow!

randy wilson

11-07-2016 11:37 AM

Re: Decking block

Quote:

Originally Posted by Billy Nees (Post 518956)

I guess THAT didn't come out right.
And the way the head gasket usually IS LARGER THAN THE BORE IN DIAMETER, ETC.ETC.ETC.

I know that sounds like it's right, but for some reason if I run zero deck, the motor is a few horse better then when running the piston down in the block to get the same compression. Maybe it's just me.

Dwight Southerland

11-07-2016 04:59 PM

Re: Decking block

Quote:

Originally Posted by randy wilson (Post 519215)

That's what I meant by "Really?!?" I have the same experience.

randy wilson

11-07-2016 07:48 PM

Re: Decking block

Quote:

Originally Posted by Dwight Southerland (Post 519224)

That's what I meant by "Really?!?" I have the same experience.

Go with what you know. As long as it comes up legal. I used to do those Wissota 2 barrel 9.5 to 1 compression things in B mod, and the zero deck motors were about 9 to 11 better then the 0.030 down motors. Just what I found out. Take it for what it's worth.

Ed Wright

11-07-2016 07:52 PM

Re: Decking block

Surprising. Same .062" squish, I'm surprised it helps to do it that way. Old as I am, I ain't seen everything yet. LOL

randy wilson

11-07-2016 09:14 PM

Re: Decking block

Quote:

Originally Posted by Ed Wright (Post 519234)

Surprising. Same .062" squish, I'm surprised it helps to do it that way. Old as I am, I ain't seen everything yet. LOL

Don't know why, and ain't smart enough to tell you why. It just is what it is. Seen it about 3 times.

Ed Wright

11-08-2016 12:13 AM

Re: Decking block

Quote:

Originally Posted by randy wilson (Post 519242)

Don't know why, and ain't smart enough to tell you why. It just is what it is. Seen it about 3 times.

Good to know, Randy. Guess Cometic would make gaskets to do that. Been running mine with .030" gaskets, and .033" in the hole.

randy wilson

11-08-2016 10:26 AM

Re: Decking block

Quote:

Originally Posted by Ed Wright (Post 519252)

Good to know, Randy. Guess Cometic would make gaskets to do that. Been running mine with .030" gaskets, and .033" in the hole.

Yes, we've ran some 60 plus gaskets many times.

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