Beware of this 4bbl gasket
Printed From: TheAMCForum.com
Category: The Garage
Forum Name: AMC 6 Cylinder Engine Repair and Modifications
Forum Description: AMC-made I-6 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=95005
Printed Date: Apr/18/2024 at 5:24pm
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Topic: Beware of this 4bbl gasket
Posted By: Thikstik
Subject: Beware of this 4bbl gasket
Date Posted: Jun/29/2018 at 11:23pm
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I have used , since 2007, a Holley thick base gasket on my 258 Gremmy with a Cliffy manifold and a 390 Holley. I chose this gasket as it is 1/4 inch thick which helps insulate carb , and may help low end a tiny bit. Well, Ive been fooled!!! It has caused me to chase my tail as carb would go rich at idle, then lean, then rich.... So i put a new one on and guess what? It was bad within 50 miles doing same thing. Which is allow vacuum to leak past its cheap laminate design no matter how tight it is. Sorry, I cant find the PN. But avoid this thing. It is porous out of the wrapper. ------------- 75 gremlin x, jeep 4.0 headed 258, 264H Cliff cam, intake,header. 390 holley. I want a 282 VAM motor! AC/PS/PDB. 72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC. |
Replies:
Posted By: Thikstik
Date Posted: Jun/30/2018 at 12:36pm
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Can say , it is a 4 hole gasket. Still cant find packaging that i hid so i can give PN. ------------- 75 gremlin x, jeep 4.0 headed 258, 264H Cliff cam, intake,header. 390 holley. I want a 282 VAM motor! AC/PS/PDB. 72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC. |
Posted By: billd
Date Posted: Jun/30/2018 at 4:09pm
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Use the phenolic spacer to insulate. Thick gaskets only help in warping carb bases...they are otherwise not worth a lot. -------------  http://theamcpages.com" rel="nofollow - http://theamcpages.com http://antique-engines.com" rel="nofollow - http://antique-engines.com |
Posted By: Thikstik
Date Posted: Jul/02/2018 at 10:23am
i do wonder if any spacing helps tork. If so, it would be very little im sure at least because were dealing with small motor. I remember being very surprised on my Pontiac 455. It gave a seat of the pants improvement. ------------- 75 gremlin x, jeep 4.0 headed 258, 264H Cliff cam, intake,header. 390 holley. I want a 282 VAM motor! AC/PS/PDB. 72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC. |
Posted By: Thikstik
Date Posted: Jul/11/2018 at 11:12pm
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Its Holley PN 758. I bought both several years ago. ------------- 75 gremlin x, jeep 4.0 headed 258, 264H Cliff cam, intake,header. 390 holley. I want a 282 VAM motor! AC/PS/PDB. 72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC. |
Posted By: BrotherBamc
Date Posted: Jul/12/2018 at 2:16am
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I used to run a big spacer on my 258. The gaskets that I always used and got good results from where the thin ones. I think they were Mr. Gasket...  ------------- 77 CJ5 360 73 Gremlin 401 4 speed 2006 Dodge Magnum R/T AWD http://www.lxforums.com/board/garage.php?do=user_garage_view&id=19745" rel="nofollow - My Garage |