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#5
05-02-2015, 05:11 AM
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Re: Two 427s
Engine#2
Well the 870 Square port has two points more compression could add about 30HP. The 781 Oval port has 20 degrees more duration could add about 30HP. But the oil pan is +10HP If the 781 larger valves were machined correct. about 1.900 Bowl area and chambers deshrouded. The Oval port Engine should take the win by about 30+ HP. I built a 049 Oval port 454 8.5to1 compression Q jet Super Stock engine in the early 1990s and it make 660HP. The Ovals can really work, these were 2.08 1.7 255ccs. 
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