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Old 05-12-2005, 04:10 PM
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Blocking off heat riser sbc intake

Would like some help on the best way to proceed, I have a small hairline crack on the mating surface of the heat riser port on stock aluminum intake I'm removing the EGR and capping it, I was told to get a thin piece of sheet metal to cover the heat riser ports as well, What's best to cover the port on the head then install the intake or cover the port on the intake then install? Or any ther opinions are welcomed. Thanks for any help. PS it doesn't have to pass emissions.or any inspections. Thanks again.

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Old 05-12-2005, 06:14 PM
Dr. Smallblock
 
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Riser block off

If the manifold is already off the motor then you are going to be installing new gaskets. that being said... the new set should come with a thin metal tab about 1 inch wide by 1.5 inches long. Simply place the block off on the gasket surface once the gasket has been coated and applied and WA-LA your riser is no longer functional. oh yeah... don't forget to do both sides. let me know if you have further questions. The Doctor is in.
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Old 05-12-2005, 10:32 PM
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Thank you for the info I just wanted to fix it up as well as I could.
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Old 05-12-2005, 11:46 PM
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Get gaskets for a propane motor, they have the passages blocked.
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Old 05-13-2005, 06:45 AM
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Should the block off piece be on the head side or the intake side of the gasket? Thanks
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Old 05-13-2005, 08:22 AM
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Quote:
Originally Posted by Eric64
Should the block off piece be on the head side or the intake side of the gasket? Thanks
It really doesn't matter. Just remember that blocking off the heat riser will effectively richen up the F/A mixture and that the motor will be very cold-blooded until it's warmed up.

tom
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Old 05-13-2005, 08:25 AM
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In the good old days we would stuff the x-over passage tight with aluminum foil balls!
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