| Best Practice - Aluminum or HardBlok in manifold? [message #341419] |
Sat, 02 March 2019 18:30  |
Bill Van Vlack
Messages: 419
Registered: September 2015
Location: Guemes Island, Washington
Karma:
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Which is better for filling the GMC cast iron intake manifold crossover, Aluminum or HardBlok?
I've had a recent quote of $100.00 from an aluminum foundry to fill the manifold. I understand it takes about 20 lbs which works out to 3.5 quarts.
Hardblock is $104.00 for their large size, which makes 3 quarts of filler. I would need to buy two of them.
My manifold has a crack, as does another that may be filled at the same time. I will use the Paterson block-off kit as well. (BTW, I've recently seen a block that had these installed and that had been in service for several years. The kit remained on the block and the SS plates were deformed into a 'hump' in the area of the exhaust ports. Presumably hot enough that exhaust heat sent them into the plastic zone and pressure pushed them in (this manifold did not have the crossover filled).
Bill Van Vlack
'76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid November 2015.
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