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01-28-2013, 12:05 PM | #1 |
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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.
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01-28-2013, 03:18 PM | #2 |
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Re: exhaust cross over (heat riser) fill
Aluminum and I pour from the intake side.
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Adam Strang 1018 STK |
01-28-2013, 08:20 PM | #3 |
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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 |
01-28-2013, 11:57 PM | #4 | |
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Re: exhaust cross over (heat riser) fill
Quote:
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01-29-2013, 06:41 AM | #5 | |
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Re: exhaust cross over (heat riser) fill
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01-29-2013, 09:35 AM | #6 |
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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 |
01-29-2013, 09:48 AM | #7 |
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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!!
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Tom Goldman 1500 SG , 1506 STK |
01-29-2013, 10:25 AM | #8 |
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Re: exhaust cross over (heat riser) fill
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01-29-2013, 11:51 AM | #9 | |
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Re: exhaust cross over (heat riser) fill
Quote:
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
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1231 FS/D Drag Pak 1231 E/SA 71 Demon Kelly MacKay Last edited by dartman; 01-29-2013 at 11:55 AM. |
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01-29-2013, 12:25 PM | #10 |
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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.
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Adam Strang 1018 STK |
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