General Head Gasket Purchasing Question
General Head Gasket Purchasing Question Ok, when buying head gaskets, they usually have a bore and a thickness. I know the head gasket bore is supposed to be a little larger than the cylinder bore. Say I want to buy head gaskets for my 4.000" bore LS1 block. Would I go to Cometic and buy 4" bore head gaskets, or buy 4.01" bore head gaskets? Basically, when Cometic advertises their head gaskets, is the bore they show the bore of the cylinder, or the bore of the gasket itself? Thanks!
i just checked a set i have still in the wrapper,i just poked a small hole to check with my calipers and they are what they say they they are or slightly bigger.mine were supposed to be 3.910 and measured between 3.915-3.918 so i say they are the size they advertise.
So you ordered head gaskets for a larger bore than what you had, then the manufaturer added even more bore. Sounds like you are supposed to order head gaskets for your bore cylinders, ie 4" head gaskets for a 4" bore, and the manufacturer makes the bore on the gaskets a little bigger.
Anyone else?
Anyone else?
Mike, order for a little bit bigger than your bore. You want the gasket at least .010" bigger, and more won't hurt. The 3.910" that cometic sells is for a stock bore of 3.898", so it's .012" bigger give or take a few. Depending on what your bore size is, get the next step up from that. I've seen people use the 4.125 Felpro's on stock blocks, but I wouldn't do that just because of the compression loss. Up to .030 bigger should be no problem.
Originally Posted by Beast96Z
Mike, order for a little bit bigger than your bore. You want the gasket at least .010" bigger, and more won't hurt. The 3.910" that cometic sells is for a stock bore of 3.898", so it's .012" bigger give or take a few. Depending on what your bore size is, get the next step up from that. I've seen people use the 4.125 Felpro's on stock blocks, but I wouldn't do that just because of the compression loss. Up to .030 bigger should be no problem.
BTW, the shortblock will be built very soon, next couple of weeks hopefully. All I'm really waiting for is some money and the Warhawk heads to come out. If they aren't out by the end of summer I'll probably use the stock heads for the time being
i would think you should be able to get a set with a bore of 4.030 or so.i'm actually glad they are a few thou over since my bore is 3.905 and sometimes your gaskets aren't exactly centered.with a 4" or bigger bore the cr loss from a 4.125 or so gasket would be very minimal.
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what thickness are you going with, the .040's seem to be the most popular Cometic ran. I am going with the cometic MLS 3.910 bore and .040 thickness to keep it close to stock setup w/ compression and valvetrain numbers
