exhaust cross over (heat riser) fill

[R. Thorne]

Anybody use the Resbond products (907gf, 940, 940ht) to fill them or does everybody just melt aluminum and pour? Any other high temp epoxy used? Pontiac v8 application. Thanks, Ron.

[Adam Strang]

Aluminum and I pour from the intake side.

[FSA1673]

Mine have been filled with aluminum, poured in from the combustion chamber. I used to just have them blocked off with aluminum plates on the intake side of the head. My 71 HO intake is aluminum and does not have the heat cross over as part of the intake.

I am curious if filling the head with aluminum will result in any power gains now that the two middle cylinders are not connected anymore.

Any thoughts??

Scott

[Mark Yacavone]

Originally Posted by FSA1673

Mine have been filled with aluminum, poured in from the combustion chamber. I used to just have them blocked off with aluminum plates on the intake side of the head. My 71 HO intake is aluminum and does not have the heat cross over as part of the intake.

I am curious if filling the head with aluminum will result in any power gains now that the two middle cylinders are not connected anymore.

Any thoughts??

Scott

Scott, You've got to figure that now you are using a true 4-tube header .. FWIW

[442OLDS]

Originally Posted by FSA1673

Mine have been filled with aluminum, poured in from the combustion chamber. I used to just have them blocked off with aluminum plates on the intake side of the head. My 71 HO intake is aluminum and does not have the heat cross over as part of the intake.

I am curious if filling the head with aluminum will result in any power gains now that the two middle cylinders are not connected anymore.

Any thoughts??

Scott

You race F/SA?

[Mike Taylor 3601]

Ron,
I use zinc alloy get from Mc Master Carr supply ,it's the same thing Mondello use to sell.
I melt enough into a steel cup I made from tubing and flat bar w/flat bar long enough to also be handle to pick up and pour with,I usaully block @ intake side and pour from bowl side have to use some sort of funnel some times.
The zinc will probaly out last the heads.
Mike Taylor 3601

[Paul Precht]

Originally Posted by Mike Taylor 3601

Ron,
I use zinc alloy get from Mc Master Carr supply ,it's the same thing Mondello use to sell.
I melt enough into a steel cup I made from tubing and flat bar w/flat bar long enough to also be handle to pick up and pour with,I usaully block @ intake side and pour from bowl side have to use some sort of funnel some times.
The zinc will probaly out last the heads.
Mike Taylor 3601

The bar of zinc alloy is the only way to go. I cut a piece off and heat it in an iron skillet like this http://img2.etsystatic.com/008/0/589...29082_6cdm.jpg with a cutting torch and pour it in, block the intake side and then blend into the bowl if it's not a stocker head.

[Rory McNeil]

Considering that all the accepted Edelbrock aluminum heads that I`ve seen have no crossover provision at all, thus no "cave" in the port, wouldn`t it be nice if NHRA allowed factory heads be completely filled too?

[MoonlightGraham]

Originally Posted by Mike Taylor 3601

Ron,
I use zinc alloy get from Mc Master Carr supply ,it's the same thing Mondello use to sell.
I melt enough into a steel cup I made from tubing and flat bar w/flat bar long enough to also be handle to pick up and pour with,I usaully block @ intake side and pour from bowl side have to use some sort of funnel some times.
The zinc will probaly out last the heads.
Mike Taylor 3601

Sorry to bring up an old thread but I was wondering how much zinc you needed to do this procedure?

This is what I found on McMaster-Carr's website:

http://www.mcmaster.com/#zinc-alloys/=outleo

Great info guys! Thank you

[Mike Taylor 3601]

I usaully buy the 4 1/2 lbs. bar 9069K2. depending on what type of heads you are working sbc can do 2-3 sets.
Have also filled intakes that are cracked in heat cross over area,just fill it up does'nt matter then.
Mike Taylor 3601