Thread: Cams for 455 engine builds.
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  #362  
Old 06-15-2017, 03:12 PM
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ponyakr ponyakr is offline
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Join Date: Dec 2011
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Originally Posted by STEELCITYFIREBIRD View Post
When did HP #'s switch from crank to @ the wheel?
Looks like the rating system changed for '72 year models. A 4-barrel 400 dropped from 300hp to 250hp.

http://www.wallaceracing.com/enginesearch4.htm

Then, as CR dropped below 8:1, hp dropped below 200. Smaller cams & exhaust valves may have also played a part in the lower hp ratings.

http://www.classicalpontiac.com/cgi-...bal/engine.cgi

Last edited by ponyakr; 06-15-2017 at 03:28 PM.
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