AFR head users
Thread Starter
Pro
Joined: Oct 2003
Posts: 550
Likes: 0
From: Hesperia California
AFR head users
Scenario
I put a set of 180 comp heads on my 89 with a Miniram and other stuff. Upon start up I had water blowing out of my driver side header. Put thicker intake gaskets on, same thing. Took heads to AFR and had them checked out. The heads checked out fine. They saw where coolant had went into two (2) exhaust ports on one head, and one (1) exhaust port on the other. They said the problem is between the deck and the heads. Gasket, torque or ?.
Question
I used ARP bolts and torqued them to 65 ft. lbs.. Didn't read the paperwork with the ARP bolts. ARP says 75 ft. lbs. with moly lubricant, or 85 ft.lbs. with 30 wt. motor oil as lubricant. Thought I would do 80 ft/lbs. with permatex.
Can 15 ft/ lbs/ make that much difference when regular bolts on torque to 65?
Anyone else experience this? Input please!
Thanks
I put a set of 180 comp heads on my 89 with a Miniram and other stuff. Upon start up I had water blowing out of my driver side header. Put thicker intake gaskets on, same thing. Took heads to AFR and had them checked out. The heads checked out fine. They saw where coolant had went into two (2) exhaust ports on one head, and one (1) exhaust port on the other. They said the problem is between the deck and the heads. Gasket, torque or ?.
Question
I used ARP bolts and torqued them to 65 ft. lbs.. Didn't read the paperwork with the ARP bolts. ARP says 75 ft. lbs. with moly lubricant, or 85 ft.lbs. with 30 wt. motor oil as lubricant. Thought I would do 80 ft/lbs. with permatex.
Can 15 ft/ lbs/ make that much difference when regular bolts on torque to 65?
Anyone else experience this? Input please!
Thanks
Melting Slicks
Joined: Mar 2002
Posts: 3,108
Likes: 126
From: S.L.C. UT
You need to make sure the deck of the block isn't warped, and is true and square. I usually run a fileboard over the deck with 80 grit to check that, if it's something your doing in the car. If not, have your machine shop check the deck if it's out of the car. If the deck of the block is out too much, it will never seal.
Edit: Plus the obvious, make sure everything is perfectly clean.
Edit: Plus the obvious, make sure everything is perfectly clean.
Le Mans Master
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
You will have to do a tear down. It is possible to get a bad seal from a thin gasket, also when putting new heads on an older block the head bolts can pull down differently on the block (pulls the cylinder out a little etc.). Either way unfortunately, it sounds like the you will need to take a closer look.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
How do the water jacket holes line up between block, gasket, and heads?
I saw one GM gasket that looked pretty far off.
Edit: Are you using normal head bolts or studs?
I saw one GM gasket that looked pretty far off.
Edit: Are you using normal head bolts or studs?
Last edited by GREGGPENN; Feb 6, 2009 at 06:36 PM.
