Posted By: docford
what gaskets to use on HEMI with bathtub intake ? - 12/26/10 10:53 PM
The intake gaskets (I currently use Fel-Pro) of my roundy-round 426 HEMI do developp leaks in the lifter valley. The issue is mainly due to the fact that the heads intake runners are very heavily ported and that the manifold has not much of a seating surface either. So once the intake gaskets settle under heat, they start to leak and oil gets sucked in the intake runners!!
Here are some pictures:
http://www.olympia-charger.com/2006/06/our_motorvation.html Are there intake gaskets of different thickness for the race HEMI?
What gaskets would you use on an Edelbrock Rat Roaster intake, which is similar to the NASCAR bathtub?
Posted By: docford
Re: what gaskets to use on HEMI with bathtub intake ? - 12/27/10 09:25 AM
will do, thanks
Any other idea? Can these gaskets be custom ordered?
Posted By: docford
Re: what gaskets to use on HEMI with bathtub intake ? - 12/29/10 11:30 AM
I found three gasket models for the 426 HEMI
Mr.Gasket 1/16" thick #303G
Mr.Gasket 1/8" thick #311
Fel Pro 0.060" thick #134-3075
The Mr.Gasket look interesting, as they are probably less prone to wrap by design.
Even though I personally prefer Fel-Pro for their quality, I'm tempted to give the Mr.Gasket models a try. Who has ever used Mr.Gasket 426 HEMI intake gaskets in a racing application and what is your experience?
Can you recommend a company that can make these in 3/32" thickness?
Posted By: quickd100
Re: what gaskets to use on HEMI with bathtub intake ? - 12/29/10 12:04 PM
All I use are the Mr. Gasket units. One thing about a hemi, when you change intake gaskets torque, retorque, retorque, retorque, retorque, and retorque again. It takes a few times before the gasket settles in, otherwise you end up with leaks as you describe. Dave
Posted By: CRE2004
Re: what gaskets to use on HEMI with bathtub intake ? - 12/29/10 02:45 PM
Exactly what Dave said about the torque. I have spoken with roadhazard a couple of times about the hemi gaskets and without volume, it didn't look promising. Maybe that's changed. I've used the fel-pro and Mr. Gasket gaskets. Both work ok. For a real good seal, I custom cut the FelPro 1290 prostock material.
Posted By: Cab_Burge
Re: what gaskets to use on HEMI with bathtub intake ? - 12/29/10 07:07 PM
Posted By: docford
Re: what gaskets to use on HEMI with bathtub intake ? - 12/29/10 07:18 PM
thanks for your advice! What sealent would you use on the bolts threads and heads? Since on the bathtub the manifold bolt heads are inside the plenum, the sealant need to be gasoline proof!