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Old 01-20-2006, 04:12 PM
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new heads chevy cast number 376450

ok or not seem to be in good condition putting on a 327

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Old 01-20-2006, 04:48 PM
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Found this at http://www.mortec.com.

376450.....75-81...262/267/305..6 or 7 exhaust bolt holes, 60cc chamber

Smogger head, nothing special. Valve sizes not stated but you can measure them. Small chamber could be problem depending on your pistons.
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Old 01-20-2006, 07:56 PM
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my 327 has flat tops will small chambers increase compression or H.P.
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Old 01-21-2006, 05:26 AM
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"will small chambers increase compression or H.P."

Yes & Yes
JA
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Old 01-21-2006, 08:03 AM
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Don`t waste your time or money on these heads if your after performance. The compression ratio will increase, but a the expense of less flow, and flow is power. These heads have small valves, as small cubic inch engines needed all the velocity they could get to make any power. If you install bigger valves of the 1.94 inch size, the chamber being so small will just shroud it and it`ll flow less than it did with the bigger valve. If you installed these, it would have explosive out of the hole power, but would fall on it`s face at 3000 RPM.
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Old 04-24-2010, 07:29 PM
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i currently own a good pair of (450) off of a 305? but not sure what year but this is what iv got, they sport 1.88 valves and small combustion chambers and i had new springs to support up to a 510'' lift and i hogged out the intake and ex ports, lets just say i can put a new pair of headder gaskets on it for the 1.58 headders and they will need to be replaced by the end of the week! i had them on a 355 13.0:1 with a 480" cam and had no problems!
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Old 04-24-2010, 08:43 PM
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This thread is 4 years old.
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Old 04-25-2010, 06:21 AM
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Quote:
Originally Posted by DoubleVision
This thread is 4 years old.
it may be 4 years old but if you have info on this topic, go ahead and sare it so other plp can see it and comment on it!!
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