Proper head gasket
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
I take that back, it's not the FSM that gives .021 as the right spec, but rather a web site when you search for 1989 corvette specs
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
The more I read the more Confusing. Looks like felpro 1010 is .039 thick. I need .021 for stock replacement. Can't seem to find them on line. I haven't tried Chev dealer yet.
Will the stock part number be on the gasket I take off of car? With only 50000 miles , I'm pretty sure they have never been changed out
Will the stock part number be on the gasket I take off of car? With only 50000 miles , I'm pretty sure they have never been changed out
Last edited by mlm0; May 2, 2016 at 10:20 PM.
Oil Producer
Joined: Apr 2014
Posts: 9,371
Likes: 2,736
no i doubt it. but just go wth the .21. i agonized over mine on the 85 which was .15 stock thickness. i put a .39 on and called it a day because it came in the kit from rock auto which was very affordable. i doubt ill notice a change. are you machining the heads a bit? i removed .003 so i was like meh. u will lose a minutae amount of compression!
Last edited by VikingTrad3r; May 2, 2016 at 11:14 PM.
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
no i doubt it. but just go wth the .21. i agonized over mine on the 85 which was .15 stock thickness. i put a .39 on and called it a day because it came in the kit from rock auto which was very affordable. i doubt ill notice a change. are you machining the heads a bit? i removed .003 so i was like meh. u will lose a minutae amount of compression!
I would like to use .021, but having trouble finding it. Won't know if I need heads milled until I get them out. If I do, then I could go with thicker gasket
Oil Producer
Joined: Apr 2014
Posts: 9,371
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pretty sure u were right with the 1010. when i researched it, it was :
aluminum heads, go with the Fel-Pro 1010
cast iron, the Fel-Pro 1003
personally, i went with the ones on the felpro engine gasket kit. i was doing an 85, iron head. i used hylomar around all the cooling jacket holes.
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Race Director
Joined: Sep 2001
Posts: 14,676
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From: NEwhere Ohio
some of the fel pro's (eapecially their 'blue ringed' performance series) dont always have ports / passageways sized right or on -center.
a perfect example is the lt1 intake manifold gaskets from fel pro. their performance series (i cant remember what they call it, i just remember it has blue lines), doesnt fit it right. holes arent always perfrctly aligned.
IMHO a fel pro is not an upgrade vs stock gaskets.
i made a point to get factory oem (composite i think it was called???) when i put new afr heads on my supercharged 93 vert.
i was also told the stock gasket is more 'forgiving' if the surface isnt well prep'd, especislly vs, the cometic....
that said its not an excuse to not do a good prep jobp
Last edited by dizwiz24; May 5, 2016 at 07:40 AM.
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
Today, I just ordered oem gaskets from chev dealer. They weren't even able to tell me what thickness the gaskets I will be receiving are. I guess I get what I get. Thanks to all for input
Mike
Mike
Team Owner
Joined: Sep 2003
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You ordered and paid for what part #?
Last edited by WVZR-1; May 5, 2016 at 02:03 PM.
Melting Slicks
Joined: Nov 2010
Posts: 2,216
Likes: 113
From: Michigan
Ok after seeing that one is .051 compressed thickness I dug out the GM 10105117 gaskets I got for a stock bore(only stock 4.000 bore) I think alum heads, I'll let you google that. Most felpro or that gm thicker gaskets are compensating for decking the block or milling the heads.
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
Great, now I'm really confused. The last thing I want to do is lose some power due to head gasket thickness. Specs say .021, GM sells me .051. Lot of difference. The only work I will have done on heads is milling if they don't check out level
Team Owner
Joined: Sep 2003
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I believe for your plan you've purchased appropriately. There's much that can be debated regarding head gasket thickness but the composition of what you've bought would likely be a "preferred" under the situation that you're dealing with. A professional engine build is an entirely different discussion and then the conversation deserves some thought.
Team Owner
Joined: Sep 2003
Posts: 25,393
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You've purchased what it was assembled with originally. You'll be fine. Generally when fitting a 4.0 gasket and it's placed on the dowels the bore isn't concentric to the gasket diameter. Even a 4.0 gasket is maybe .050+ to avoid that issue.
Last edited by WVZR-1; May 7, 2016 at 07:03 PM.