Correct Header Gasket?
Thread Starter
Racer
Joined: Oct 2001
Posts: 385
Likes: 3
From: Lincoln CA
Correct Header Gasket?
I think I choose the "correct" headers and am placing an order for them. Now I'm trying to figure out the correct Fel Pro header gasket. There are three for a BBC, but only two sound "correct."
PN-1412 Large Round Port
PN-1411 Round Port
PN-1410 Square Port
I'm guessing I'd have round, and probably NOT the large one, as that is probably for hogged out heads for HP and racing.
I've got a GMPP HO454 with 118cc rectangle port heads, these are "high performance" (claimed by the GM literature) and cast iron with open combustion chambers and 2.19/1.88 valves.
Also, what side header bolts does a BBC take? 3/8" bolt by 3/4" or 1" long?
How close are the header bolts to the tubes? Should I opt for the 6 point 5/16" head ARP bolts or are the 3/8" 6point heads ok?
PN-1412 Large Round Port
PN-1411 Round Port
PN-1410 Square Port
I'm guessing I'd have round, and probably NOT the large one, as that is probably for hogged out heads for HP and racing.
I've got a GMPP HO454 with 118cc rectangle port heads, these are "high performance" (claimed by the GM literature) and cast iron with open combustion chambers and 2.19/1.88 valves.
Also, what side header bolts does a BBC take? 3/8" bolt by 3/4" or 1" long?
How close are the header bolts to the tubes? Should I opt for the 6 point 5/16" head ARP bolts or are the 3/8" 6point heads ok?
Melting Slicks
Joined: Sep 2004
Posts: 2,412
Likes: 3
In my experience, the header gasket needs to match the header flange, not the head ports. And both the header and the gasket need to be the same size or bigger than the exhaust port... unless you don't like to go fast. 
Thread Starter
Racer
Joined: Oct 2001
Posts: 385
Likes: 3
From: Lincoln CA
Originally Posted by torqvette
In my experience, the header gasket needs to match the header flange, not the head ports. And both the header and the gasket need to be the same size or bigger than the exhaust port... unless you don't like to go fast.
So the headers are 1.875" and they look round (from pics online) so I guess the normal Round Port 1.94" will work fine...
Unless when the headers show up and I remove the manifolds that my heads have HUGE exhaust ports...
Thread Starter
Racer
Joined: Oct 2001
Posts: 385
Likes: 3
From: Lincoln CA
Originally Posted by guppie
Mine came with the gaskets. I assumed most of them did 
Never had a Fel Pro header gasket blow out, nor have I had an SCE Copper embossed collector gasket blow out either.
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