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 Post subject: Quench area
 Post Posted: Mon Mar 07, 2011 3:14 pm 
 
Heres the engine bbc, 4.5 bore, steel rod,on gas, 73 -7500 rpm , how tight would you go :-k Not kissing the head and not leaving any power on the table. I want the cake and eat it to.


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 Post subject: Re: Quench area
 Post Posted: Mon Mar 07, 2011 4:49 pm 
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How loose are the pistons in the bore and what gasket.

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 Post subject: Re: Quench area
 Post Posted: Mon Mar 07, 2011 5:35 pm 
 
This is a new build Gen 6 502 block .030 bore with Weisco pistons .005 piston to wall clearance. Will deck block and select head gasket or combination of both Cometic head gaskets .0027,30,40,45,50


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 Post subject: Re: Quench area
 Post Posted: Mon Mar 07, 2011 6:42 pm 
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I would keep it down say 10 and use a 40 or so gasket...But others may disagree
some... [-X
It's a bracket motor??? Steel rod?? Better safe than sorry..Pistons really get rocking so wait till you get some heat in it before you whack it =;

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 Post subject: Re: Quench area
 Post Posted: Mon Mar 07, 2011 7:01 pm 
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So here's an experience I had with a pump gas/methanol 23* 434 SBC in a 9.000 deck BowTie block. Pistons were .003 out of the hole and used an .038 gasket. Several cylinders showed that the pistons were "kissing" the head in the quench area but it ran like that for the better part of 9 years in RPM ranges up to 7700 or so on quarter mile runs.

Same block but now an 18* C12/methanol engine with same .003 out of the hole using a Cometic .040 gasket. Had that down this winter and it didn't show any contact between piston and head. RPM range on that engine has been up to 8600.

Your mileage may vary.

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 Post subject: Re: Quench area
 Post Posted: Tue Mar 08, 2011 9:51 am 
 
And I was questioning myself for thinking .041 was giveing up a little. Thanks guys =;


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 Post subject: Re: Quench area
 Post Posted: Tue Mar 08, 2011 10:50 pm 
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Beretta wrote:
I would keep it down say 10 and use a 40 or so gasket...

I like those numbers, mine is 10 & 37. You're not leaving that much on the table IMO


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