Head gasket differences....?
03-29-2006, 08:53 PM
#1
Head gasket differences....?
I'm bulding a 347 with AFR 185 head as some may know, and I bought head gaskets, Fel-Pro # 1011-1 beacaue of their .041" compressed thickness. On the sets themselves they say from 62-82 289, 302, 351.
On Summit's site under the application tab they list for every small block from 1968-2001 for both the 1011-2 and 1011-1 gaskets. The only differences I find between them is a copper fire ring on the 1011-2 and a steel fire ring on the 1011-1 and the compression difference, .039 and .041
I asked my cooworker who used to build engines for a living and thought there was a flow difference in like 82 1/2" but wasn't sure, neither am I.
The way I understand it is that coolant get into the engine throught the water pump through the tming chain cover then (in EFI model manifolds anyway) through the block, up to the heads then go back to the front of the heads into the intake's passages, then out the thermostats.
The thing we could think of is that is the passages are cut out wrong for my application then coolant is just going to flow right up to the front of the head and out the thermostat and the coolant stays at the back of the block and heads and over heats that portion of the engine.
I think I'm going to compare a plain jane gasket at an auto parts store with the 1011-1 and see f the holes are different.
http://store.summitracing.com/defaul...=egnsearch.asp
Thanks for reading!
Matt
On Summit's site under the application tab they list for every small block from 1968-2001 for both the 1011-2 and 1011-1 gaskets. The only differences I find between them is a copper fire ring on the 1011-2 and a steel fire ring on the 1011-1 and the compression difference, .039 and .041
I asked my cooworker who used to build engines for a living and thought there was a flow difference in like 82 1/2" but wasn't sure, neither am I.
The way I understand it is that coolant get into the engine throught the water pump through the tming chain cover then (in EFI model manifolds anyway) through the block, up to the heads then go back to the front of the heads into the intake's passages, then out the thermostats.
The thing we could think of is that is the passages are cut out wrong for my application then coolant is just going to flow right up to the front of the head and out the thermostat and the coolant stays at the back of the block and heads and over heats that portion of the engine.
I think I'm going to compare a plain jane gasket at an auto parts store with the 1011-1 and see f the holes are different.
http://store.summitracing.com/defaul...=egnsearch.asp
Thanks for reading!
Matt
03-29-2006, 09:10 PM
#7
RE: Head gasket differences....?
Interesting.
I'll have to check my actually deck height. I guessed it's at .002" and with a .039 gasket and with 5cc of reliefs and 61cc heads it'd be at 10.53:1 which isn't bad.
I'll see what AFR says on the phone.
I'll have to check my actually deck height. I guessed it's at .002" and with a .039 gasket and with 5cc of reliefs and 61cc heads it'd be at 10.53:1 which isn't bad.
I'll see what AFR says on the phone.
03-29-2006, 09:15 PM
#9
RE: Head gasket differences....?
What time is it there? 4:15? It's 6:15 here...lol
It's not going to change what I do in the next few days...still waiting for them to make my heads actaully!
It's not going to change what I do in the next few days...still waiting for them to make my heads actaully!
03-29-2006, 09:18 PM
#10
RE: Head gasket differences....?
LOL. I called and they said that they've been running the 1011-1s for years and the onky difference is in fact the steel vs copper and thickness..Woot.