LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

The LT4 "race" Intake Gasket (12367777)

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Old Jul 20, 2004 | 11:49 PM
  #1  
7zark7's Avatar
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The LT4 "race" Intake Gasket (12367777)

Has anyone measured the exact size of the intake port openings in the gasket? It would also help to get outside measurement as well to see how much I could trim it, if need be. It's a special order part that's not returnable, or so my dealer says, so it would be a shame to get one and not be able to use it.

Wondering if it will fit the big intake ports on my cylinder heads.

TIA
Old Jul 21, 2004 | 10:32 AM
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From: smog zone adjacent to a great lake
Re: The LT4 "race" Intake Gasket (12367777)

1.245" X 2.285". Center web is 7/32"......top web is 15/64"...bottom almost 1/4". Just as important is the position of the opening, heightwise, in relation to the mounting holes.
Old Jul 21, 2004 | 11:27 AM
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Re: The LT4 "race" Intake Gasket (12367777)

Thanks a lot arnie!

Based on your measurements the height looks okay, but the width is a little too small by around 0.15". Is there room in the width to trim the gasket? I would need to trim around 1/32-2/32 off the center web and the other 0.118" from the other side. Is there enough room on the gasket to do that?
Old Jul 21, 2004 | 11:54 AM
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Re: The LT4 "race" Intake Gasket (12367777)

Based on placement of raised sealing bead, not designed for that. See it compromising seal. Maybe not on center web, but outside.......
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