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Old 03-06-2012, 02:35 PM
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matching heads with block

i have a 454 #3999289 & i have a set of 990 squareport heads.i notice a couple of holes on heads that i dont see on block & im jus wondering will it run hot if i block the holes.according to castings their both early model parts.pls help me!!!

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Old 03-06-2012, 03:04 PM
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They did series cooled and Parallel cooled. You can drill the holes in the block and the front cylinders will run cooler with the appropriate head gasket. With series cooled (no extra holes in block) most of the coolant has to run to the rear of the engine before coming up to the head and back to the front. At least that's my understanding.
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