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Discussion Starter · #1 ·
Did GM change the design of the waterneck gasket at some point? My FSM shows it to be a flat gasket that covers the are extending around the 2 bolts. Alldata shows the same. Autozone only carries an O-ring for the water neck, and thats what my local stealership has listed. Is the O-ring sufficient? I bought a delco thermostat to install when I replace my pump and it didn't come with anything as far as seals go.
 

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Discussion Starter · #3 ·
Is that a separate gasket, or is that the one thats attached to the thermostat I bought? I never did an LT1 thermostat before, only 305s and 350s.
 
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The thermostat should come with the rubber O ring necessary for sealing the goose neck. If someone put any other gasket material on there before, it will have to be completely removed.
 

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yeah, there is one gasket for the thermostat (round o-ring) and one for the housing as you described, which extend around the 2 bolts. i didnt use any sealer/RTV but some locktite on the bolts, and brand new stainless bolts.
 

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Discussion Starter · #6 ·
I thought there was a gasket there, but my GM dealer didnt have anything listed for there. The only thing I found was advance auto has some performance one for almost $20 (just for a gasket).
 

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No gasket, its just a o ring around the tstat.
 
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