Cylinder head heat crossover?

[Jeff Stout]

Thank you. But on Olds they have a steel valley pan/ intake gasket all in one
I might trim the steel valley pan to allow for these gaskets to work. That might be the ticket.
Also I was going to use stainless steel for blocking.

[Mark Yacavone]

A little lead is good for it. LOL
I can't remember if there are 1 or 2 exh. passages up to the intake side, but you want them completely filled and separated so the headers scavenge correctly. I've done many, many sets that are out there, using molten aluminum.
Also you want to mill the exh . side until the center ports are completely divided. Either that, or build up a dam on you header flanges.

[FED 387]

4 suggestions

1-Edelbrock #2733 plug ---about $12
2-Mondello #HR-351 insert---about $25
3- fill the cavity with liquid aluminum or maybe try JB weld
4- fabricate an aluminum plate to fit between the gasket and the cylinder head might have to resurface the manifold to compensate for the space

FED 387

[Jeff Stout]

Originally Posted by FED 387

4 suggestions

1-Edelbrock #2733 plug ---about $12
2-Mondello #HR-351 insert---about $25
3- fill the cavity with liquid aluminum or maybe try JB weld
4- fabricate an aluminum plate to fit between the gasket and the cylinder head might have to resurface the manifold to compensate for the space

FED 387

Thank you. I think the stainless insert will be the way..

[Mark Yacavone]

I don't know that you can't block the intake, if they let you fill the head all the way down to the port.
You could take a chunk of 1/4 " aluminum or steel and make a plug with tapered sides, and bang it in there.
No bubble packs here, unless we have to.

[Shadylane]

2020 Rule book: Stock Cars

Cylinder Heads
“Heat riser passage may be blocked from intake manifold side of cylinder head. Blocking passage down in the valve pocket prohibited.”

My interpretation: don’t block anywhere down into the head, but that’s just me. I would hate to get busted for plugging the head when a thin piece of stainless will be sufficient.

Kelly

[Mark Yacavone]

Originally Posted by Shadylane

2020 Rule book: Stock Cars

Cylinder Heads
“Heat riser passage may be blocked from intake manifold side of cylinder head. Blocking passage down in the valve pocket prohibited.”

My interpretation: don’t block anywhere down into the head, but that’s just me. I would hate to get busted for plugging the head when a thin piece of stainless will be sufficient.

Kelly

Kelly, As long as the plug is recessed a tad and not reshaping the port, it's fine. We've been doing them that way for year....Hettler /Kadar/ Watters , and others.

[older racer]

hi, I found .015 stainless sheet works excellent. used same ones for last 10 years, has never burned out or blew a hole through it. mine are 2" by 2 1/2 "just food for thought.

[HP HUNTER]

Originally Posted by Mark Yacavone

I don't know that you can't block the intake, if they let you fill the head all the way down to the port.
You could take a chunk of 1/4 " aluminum or steel and make a plug with tapered sides, and bang it in there.
No bubble packs here, unless we have to.

"No bubble packs here"



I could of sworn that was you standing in the window waiting for the UPS truck intently LOL

[Myron Piatek]

On applications that can use sheetmetal to block the crossover, I've had good luck with aluminum (thicker than cans) if glued & coated on the inside with a good hi-temp silicone to help insulate it.