exhaust cross over (heat riser) fill
 

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.

Re: exhaust cross over (heat riser) fill
 

Aluminum and I pour from the intake side.

Re: exhaust cross over (heat riser) fill
 

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

Re: exhaust cross over (heat riser) fill
 

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

Re: exhaust cross over (heat riser) fill
 

You race F/SA?

Re: exhaust cross over (heat riser) fill
 

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

Re: exhaust cross over (heat riser) fill
 

It's a good idea to pre heat the cylinder head before pouring the aluminum filler.
otherwise the fill chills too quickly and can shrink around the outside. also make sure you melt enough to do it in one pour.
I fill from the intake side,blocking the port side with a little furnace cement and a steel plate securely blocked in place.
You dont want that come out while you're filling! ...unless you like shiney silver shoes!!

Re: exhaust cross over (heat riser) fill
 

Yes, run in E and F, mostly local combo events. 1971 Pontiac T-37 455/335 hp combo.

Thanks, Scott

Mark,

Yes headers should work as designed just not sure it will actually turn into more power and lower et?

Re: exhaust cross over (heat riser) fill
 

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

I use thick tin between my intake gasket and head as i was told by the tech guy that pouring in is prohibited

Re: exhaust cross over (heat riser) fill
 

As I said before I pour from the intake side and use steel wool to block the passages in the exhaust runner.

I have dynoed it both ways and did see a difference.

It also gets rid of the dead skip sound Pontiac`s have with open headers.