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Old 05-18-2010, 07:33 PM
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Which head gasket to use on zero deck sbc

I am almost ready to assemble my engine but need to order a few final parts first. I am going to be running flat top speed-pro 4.030" pistons which the block has been zero-decked to. I am also using 76cc World Products S/R Torquer heads that will put my CR at approximately 9-9.1:1. I was planning on using the Fel-Pro 7733PT2 head gaskets that came in my gasket kit. They have a compressed thickness of .039" and a bore of 4.125". I have seen recommendations of using a gasket with compressed thickness of .040 or .041 with a zero decked motor. Can this small difference in thickness really make an noticeable difference? It also looks like the .040 and .041 gaskets are made of much better materials which must account for the cost difference.

I think I will order either the Fel-Pro Z1142 @ $75 or the Fel-Pro Z1003 at $35. Why the big difference in price and will either work for me?

Thank You,

Derek

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Old 05-18-2010, 07:49 PM
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I'd rather see a 4.060x.035, but what you have should work well.
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Old 05-18-2010, 08:04 PM
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Quote:
Originally Posted by stroker_SS
I'd rather see a 4.060x.035, but what you have should work well.
Are you talking about the gaskets that came in my kit? Are these inferior to the higher priced gaskets and more likely to fail? Or should they work well and hold up with my setup?
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Old 05-18-2010, 09:03 PM
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What you already have will be just fine, it will take more HP than SR heads will make to hurt them. Don't worry about the .001" thinner either.
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Old 05-18-2010, 09:51 PM
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Quote:
Originally Posted by ericnova72
What you already have will be just fine, it will take more HP than SR heads will make to hurt them. Don't worry about the .001" thinner either.
Cool, thanks that is what I will do.

It's funny that both of you that have replied are from Lower Michigan. I grew up in Pinckney, MI and now live in San Diego.
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Old 05-18-2010, 11:08 PM
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My intentions were to flee the state for warmer climates(tenn or NC) after I graduated my tech school "because there were NO field related jobs in Michigan". Problem is the ONLY field related job(that would hire a newbie) that I found happened to be right next door in Romulus. Kinda wierd how life works huh?
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Old 05-19-2010, 09:49 AM
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Quote:
Originally Posted by dlisabeth
I am almost ready to assemble my engine but need to order a few final parts first. I am going to be running flat top speed-pro 4.030" pistons which the block has been zero-decked to. I am also using 76cc World Products S/R Torquer heads that will put my CR at approximately 9-9.1:1. I was planning on using the Fel-Pro 7733PT2 head gaskets that came in my gasket kit. They have a compressed thickness of .039" and a bore of 4.125". I have seen recommendations of using a gasket with compressed thickness of .040 or .041 with a zero decked motor. Can this small difference in thickness really make an noticeable difference? It also looks like the .040 and .041 gaskets are made of much better materials which must account for the cost difference.

I think I will order either the Fel-Pro Z1142 @ $75 or the Fel-Pro Z1003 at $35. Why the big difference in price and will either work for me?

Thank You,

Derek
The issue at these dimensions is less one of compression and more of potential collision between piston and head. The piston rocks around it's pin going over the top, a situation exacerbated by the pin off set which is usually .060 inch but some makers use more, others less. This rocking is from a transfer of thrust faces on the skirt; in the process of doing this, the piston tilts and its crown is high on one side of the bore. As you get under .040 inch, the risk of the piston hitting the underside of the squish/quench deck goes up, this is what people are trying to avoid with the .040 minimum clearance. .039 may be fine, but keep in mind where all this is headed. Some racers run 'em tighter but to do that they are using a zero offset pin and very tight skirt clearances. This is getting edgy but when big bucks are on the win/lose line this is the kind of stuff you try to get away with. For a street engine this just an invitation to destroy expensive engine parts.

Bogie

Last edited by oldbogie; 05-19-2010 at 10:28 AM.
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Old 05-19-2010, 11:44 AM
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The 1142 is a MLS gasket and the 1003 is a composite.
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Old 05-20-2010, 12:07 PM
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Quote:
Originally Posted by oldbogie
The issue at these dimensions is less one of compression and more of potential collision between piston and head. The piston rocks around it's pin going over the top, a situation exacerbated by the pin off set which is usually .060 inch but some makers use more, others less. This rocking is from a transfer of thrust faces on the skirt; in the process of doing this, the piston tilts and its crown is high on one side of the bore. As you get under .040 inch, the risk of the piston hitting the underside of the squish/quench deck goes up, this is what people are trying to avoid with the .040 minimum clearance. .039 may be fine, but keep in mind where all this is headed. Some racers run 'em tighter but to do that they are using a zero offset pin and very tight skirt clearances. This is getting edgy but when big bucks are on the win/lose line this is the kind of stuff you try to get away with. For a street engine this just an invitation to destroy expensive engine parts.

Bogie
The speed-pro pistons I am using are coated and require less cylinder wall clearance. The clearance recommended by speed-pro is only .001". This should help limit the rocking of the piston.
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