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Old 10-24-2002, 06:39 PM
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Arrow Vortec Head Quick Question

I know I can mill the valves to 2.02/1.60 but can I mill the bore size out to fit my 400 sbc?


Thanx Mitch

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Old 10-24-2002, 06:51 PM
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i'm not sure but,it might be a good idea to make sure your heads have steem holes for you 400.these holes were added to allow for cooling. they're little holes about 1.5 inches apart in between the chambers.these casting #s are 333882,462624,468642,3973493. there could be more but these are all i have.
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Old 10-24-2002, 07:00 PM
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Ill check and see what my casting numbers are, thanks, could I just block the holes off or are they vital? Still need to know if I can mill em out to a 4 1/8th inch bore, or more if I bore em out.


Thanx again

Mitch
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Old 10-25-2002, 06:27 PM
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you don't mill out heads! you will need to drill them if you are going to run them on a street car, but they will fit a 400 fine otherwise. if you go to a 1.6 exhaust valve you will need to put new hard seats in the head, this costs about $120.00 extra around here.
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Old 10-26-2002, 05:49 PM
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Go to a GM dealer and get a engine performance book. It tells you everything on blueprinting a motor, plus the heads. Use a Fel-Pro 1014 marine head gasket for the hole location.(they have the steam holes for a 400sbc). Plus the gaskets have been revised coolant holes to even out the coolant flow. I belive the upper hole is 1/8" and the lower is 3/16". They MUST be drilled at the proper angle or you mite go into the intake runner. You should use the holes to stop hot spots or keep the motor above 3000rpm.
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