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head gasket thickness?

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head gasket thickness? #1
johncarro John Carro Fayetteville, NC, USA Sign in to contact 1973 MG Midget "Johncarro"	Topic Creator (OP) Jul 29, 2015 09:41 AM Joined 11 years ago 53 Posts

I need to replace the head gasket on my 73 Midget. I was thinking about the Cometic. I see that there are several thicknesses. Does the thickness matter or is it a preference. Is there a preferred gasket that most owners use? Thanks.

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Re: head gasket thickness? #2
trevorwj Trevor Jessie Louisville, KY, USA Sign in to contact	Jul 29, 2015 09:46 AM Top Contributor Joined 16 years ago 6,280 Posts

Why did the first head gasket fail?

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Re: head gasket thickness? #3
johncarro John Carro Fayetteville, NC, USA Sign in to contact 1973 MG Midget "Johncarro"	Topic Creator (OP) Jul 29, 2015 12:06 PM Joined 11 years ago 53 Posts

No idea, I have oil in the radiator and just found water on the valves.

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Re: head gasket thickness? #4
trevorwj Trevor Jessie Louisville, KY, USA Sign in to contact	Jul 29, 2015 12:20 PM Top Contributor Joined 16 years ago 6,280 Posts

Once you fix the problem I would just use a payen black composite gasket. The cometic gaskets are used by people that are trying to fine tune their CR to run on the edge.

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Re: head gasket thickness? #5
Speedracer Hap Waldrop Taylors, SC, USA Sign in to contact 1967 MG MGB Racecar "The Biscuit"	Jul 30, 2015 05:28 AM Top Contributor Joined 18 years ago 43,748 Posts

The black composite head gasket are .035", the Copper gaskets are .030", really either thickness will work fine on the Cometic. If you going to spend $100 on head gasket, maybe a set of ARP head studs are worth considering, I would also straight check the block,and head deck for straightness, using a straight edge I attempt to get a .002" feeler gauge under the straight edge is several places on the deck, if I cannot, then a gasket should hold fine. Now decking the block requires the engine be torn down, but the head can be easily resurfaced, and that would be a good idea. Good luck

Hap Waldrop
Acme Speed Shop
864-370-3000
Website: www.acmespeedshop.com
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