383 head gasket problems with nitrous

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May 12, 2008 | 10:28 AM

#16

96capricemgr

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Joined: Feb 2004

Posts: 4,800

I would think hardness would show up under power as a sudden loss of sealing of the gasket. Weeping IMO points towards bad machine work in flatness or finish on one or both of the mating parts.

When you say cylinders 7-8 you are saying the rearmost cylinders on BOTH sides right??

May 12, 2008 | 12:20 PM

#17

kline454

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Joined: Jul 2006

Posts: 420

yea the rear cyl. on both sides it looks as if when the block was zero decked they didnt do a very good cut and left small marks for the compression to leak out..

May 12, 2008 | 01:34 PM

#18

TitoPR221

Registered User

Joined: Feb 2008

Posts: 292

From: Robinson Township, PA

Quote:

Originally Posted by kline454

Well i started out last year with the felpro 9966pt and after about a month the head gaskets started to leak on cly. 7-8 then i went to the 1074 head gaskets ran them all year no problems now i went with le2 heads and the MRG-5716 gaskets and now there leaking on cly. 7-8, i was thinking about going with the 1074 gaskets but would lose compression so im looking at http://store.summitracing.com/partde...T&autoview=sku has anyone tryed these??

Another item to consider: Did you deck the block? The factory deck flatness and surface finish are unreliable at best. You got new heads that are certainly "true" with polished surfaces. If the deck is not true and the surface finish is not as per gasket manufacturer requirements, then the gaskets are bound to fail under the higher stress.