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  #1  
Old Jun 28th, 06, 07:05 AM
67SS&99SS 67SS&99SS is offline
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Andy
 
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Default piston to deck height clearance for sbc

What is the typical piston to deck height clearance for a 350 block? Is it .040"? I am putting together a 383 with my engine program and with 64 CC vortec heads, a .040" depth for the piston in the bore, 12 CC dished piston, and a .015" head gasket, I am getting 9.96:1 CR which is exactly what I want. I want to stay as close to my target of 10:1 CR as possible. Am I right in assuming a .040" clearance? How much could it be off from that? FYI, have a 1970 350 4 bolt main block that has never been machined.
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  #2  
Old Jun 28th, 06, 07:17 AM
JimM JimM is offline
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Default Re: piston to deck height clearance for sbc

particularly with a stroker, deck clearance HAS to be actually measured, don't assume.

A stock engine generally has around .025" deck clearance.

When I did my stroker, at final assembly it measured ZERO deck! This was an undecked numbers block, with scat crank & 6" rods, and SRP pistons. I ended up throwing away a set of 1094's and using a different gasket to get .040" piston to head (quench) clearance.

Checking deck ht is easy, just use a straightedge and a feeler guage.
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Old Jun 28th, 06, 07:24 AM
rojo rojo is offline
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Default Re: piston to deck height clearance for sbc

I agree with Jim, you need to measure it. My '69 was .025 and the '67 was .045. The '67 must have some sort rebuilders pistons in it.

Edit: I reread the post and saw "engine program". At first I thought you were bolting your heads on now.
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Old Jun 28th, 06, 07:58 AM
67SS&99SS 67SS&99SS is offline
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Default Re: piston to deck height clearance for sbc

Thanks guys. It will definately be measured when it is assembled. I hope that it will work out so that I can easily obtain my 10:1 CR. I should be able to play around with head gasket thicknesses to get it pretty close, right? Here is a dyno graph of my current setup. The higher numbers are open headers and the lower are 2.5" dumped exhaust. I achieved this with a hydrallic flat tappet off the shelf cam, vacuum secondary carb, clutch fan, production water pump, power steering, and the 170 CC combustion chamber of vortec heads


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Last edited by 67SS&99SS; Jun 28th, 06 at 08:10 AM.
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Old Jun 28th, 06, 08:45 AM
NER perf NER perf is offline
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Default Re: piston to deck height clearance for sbc

im confused .are you saying pistons are 040" in the hole or head deck to block/quench side of piston is 040"away? those are two different measurements if you run that mototr with the pistons 040"in the block it will rattle itself to death .youd run better with more compression and better quench for sure
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Old Jun 28th, 06, 08:50 AM
JimM JimM is offline
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Default Re: piston to deck height clearance for sbc

I think he's asking if his assumptions are in the ballpark.
Personally, after my experience, I wouldn't even buy head gaskets for a stroker untill I've put a piston in and measured the deck clearance.

As long as you can gasket for .040 piston to head, the actual deck clearance won't effect your compression ration.
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Old Jun 28th, 06, 08:55 AM
67SS&99SS 67SS&99SS is offline
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Default Re: piston to deck height clearance for sbc

Quote:
Originally Posted by NER perf
im confused .are you saying pistons are 040" in the hole or head deck to block/quench side of piston is 040"away? those are two different measurements if you run that mototr with the pistons 040"in the block it will rattle itself to death .youd run better with more compression and better quench for sure
Thanks for the reply, but like Jim M said, I am wanting to know typically how far a piston is down in the bore when it has reached its full stroke. I understand those numbers are two different numbers. What should be my total overall piston to head measurement? Should it be between .040 and .050? I was saying .040 for the piston in the bore as baseline number since I am unsure of what the spec number should be. I understand that it can fluctuate, but I am just wanting a good ball park figure.
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Last edited by 67SS&99SS; Jun 28th, 06 at 09:13 AM.
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Old Jun 28th, 06, 08:56 AM
67SS&99SS 67SS&99SS is offline
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Andy
 
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Default Re: piston to deck height clearance for sbc

Quote:
Originally Posted by JimM
I think he's asking if his assumptions are in the ballpark.
Personally, after my experience, I wouldn't even buy head gaskets for a stroker untill I've put a piston in and measured the deck clearance.

As long as you can gasket for .040 piston to head, the actual deck clearance won't effect your compression ration.
Thanks for the info Jim.
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Old Jun 28th, 06, 12:40 PM
DZ Fool DZ Fool is offline
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Default Re: piston to deck height clearance for sbc

Piston to Head is a combination of measurements . Piston to deck is just that , how far in the bore the piston is in relationship to the block. If you are 40 in the hole and a .015 head gasket your quench is .055 Which is allot
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  #10  
Old Jun 28th, 06, 12:46 PM
67SS&99SS 67SS&99SS is offline
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Andy
 
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Default Re: piston to deck height clearance for sbc

what should the total quench be? .035-.045?
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Old Jun 28th, 06, 12:53 PM
eville eville is offline
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Default Re: piston to deck height clearance for sbc

from what I understand .035-.045" is ideal. There is a lot of good reading about this topic on this site if you use the search feature.
Do as JimM said, don't buy head gaskets til you measure the piston to deck height. There are a lot of available thickness gaskets out there.
Good Luck.
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Old Jun 28th, 06, 05:47 PM
pdq67 pdq67 is offline
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Smile Re: piston to deck height clearance for sbc

I figure that GM tried to make our old motors at .025" down in the hole piston b/c they used .020" steel shim headgaskets on them.

For a .045" quench which as we have found out tend's to be like at the max. WE want for a hi-po motor.

pdq67
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Old Jun 28th, 06, 07:59 PM
67SS&99SS 67SS&99SS is offline
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Andy
 
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Default Re: piston to deck height clearance for sbc

thanks for all of the help guys! i dont plan on buying gaskets until the short block is completely assembled and I will talk to my engine builder about it.
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