LT4 Heads
Thread Starter
Racer
Joined: Jun 2002
Posts: 401
Likes: 41
From: Parrish FL
LT4 Heads
What are the dimensions of the intake ports on a LT4 vs LT1. The LT4 is supposed to be higher, but the intake gaskets I find say they are for both(Summit #FPP1284 is for both heads). They should be different. It would either be too big for one or too small for the other. I bought the 1284 and it is too small for my heads. Anybody know what number I really need, or do I need to just get a GM one.
Thanks
Jim
Thanks
Jim
Racer
Joined: Jul 2001
Posts: 393
Likes: 1
From: Houston TX
I believe that the stock LT4 gaskets covered part of the intake port. I believe there is a GM gasket that fits without covering the ports and is part number 12367777. This is from Chris at Superior Chevrolet. I have yet to install my new gaskets so I can't confirm or deny that they fit right.
Jason
Jason
Le Mans Master
Joined: Jul 1999
Posts: 8,683
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From: Phoenix AZ
Originally Posted by jsaunde2
I believe that the stock LT4 gaskets covered part of the intake port. I believe there is a GM gasket that fits without covering the ports and is part number 12367777. This is from Chris at Superior Chevrolet. I have yet to install my new gaskets so I can't confirm or deny that they fit right.
Jason
Jason
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 2
From: Cincinnati Oh
Originally Posted by jsaunde2
I believe that the stock LT4 gaskets covered part of the intake port. I believe there is a GM gasket that fits without covering the ports and is part number 12367777. This is from Chris at Superior Chevrolet. I have yet to install my new gaskets so I can't confirm or deny that they fit right.
Jason
Jason
I installed the 7777 series gasket on my lt4 a couple of months ago. It was slightly bigger so as to not cover the ports as compared to the factory gasket. If you are going to replace the intake gasket, I would definately use the 7777 series gasket.
