Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

Which GM head gaskets for 403"

Thread Tools
 
Search this Thread
 
Old Dec 16, 2015 | 04:16 PM
  #1  
455GTO's Avatar
Thread Starter
TECH Apprentice
iTrader: (18)
 
Joined: Sep 2009
Posts: 355
Likes: 17
From: CA
Default Which GM head gaskets for 403"

I have a set of GM Ls2 4.0" bore head gaskets I'd like to use with my 403ci (4.005") I'm putting together. Would these be ideal with a set of 243 heads, or would the Ls3 gaskets be best?
Reply
Old Dec 16, 2015 | 04:22 PM
  #2  
A.R. Shale Targa's Avatar
11 Second Club
iTrader: (2)
 
Joined: Feb 2011
Posts: 3,729
Likes: 15
From: Fredonia,WI
Default

Those would work great as the diameter is 4.020". Easily clearing your bore size
There is a Tony Mamo explanation which uses larger than bore size gaskets to unshroud combustion chamber shapes that let larger valves breath. So I'd imagine that based on his belief, your cylinder head/valve choice could play an important roll in the diameter of head gasket you select
Reply
Old Dec 18, 2015 | 12:59 AM
  #3  
SydwayZ's Avatar
Staging Lane
 
Joined: Apr 2015
Posts: 79
Likes: 0
From: New Orleans
Default

Those gaskets will work fine.
Reply




All times are GMT -5. The time now is 10:45 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE