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Originally Posted by Gburg
Which would you choose a Roush or Ford Racing powerplant? I have seen Roush crate engines priced twice the going price of Ford Racing crate engines, which offer the same H.P. output. I question paying the Roush price when Ford Racing has the same product for half the $$$$. Most of the Cobra MKIII replicas that I have seen have Ford Racing engines.
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Not all HP figures (dyno's) are equal. You need to check with some engine builders/installers that have used these engines, dyno'd them side by side to compare.
For example, I just had my engine, chassis dyno tuned, stock stroke iron FE 427, 10.5:1, factory aluminum dual plane intake, original 780 vacuum carb. Engine pulled 454 rwhp, and 488 rwtq. My engine builder (tuner in my case) has installed numerous roush 427's, come with a dyno sheet of 560+ hp, but once installed in the car, on the chassis dyno, they consistantly pull 410-420 rwhp, and 410 rwtq. He also has built 484 aluminum FE's, with shelby heads and intake (basically an edelbrock performer RPM), and they pull about 435-445 rwhp.