I was getting ready to put my intake manifold back and noticed the rear coolant ports on the gaskets are blocked off.What's the purpose of them being blocked?Thanks Bobby
1988 S-10 Blazer 4.3<Question?
Feb 12, 2005
2 Replies
they are blocked because they're not used. a SBC head (or derivatives) will work on either side of the engine, there aren't right or left side only heads. if you look at the intake manifold, there isn't a coolant passage in the rear, like there is in the front.
hth, Bret
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