Quote:
Originally Posted by jhein
For comparison, this graph is from the motor that went on the dyno right before mine. It is a Pontiac IAII 499 cid 250 + duration/600 lift cam, Edelbrock ported round port heads, single plane intake and 850 cfm (I think) carb. Based on these results I think he has a fairly stingy dyno. He told me he thinks it's 25-30 HP on the conservative side. Based on my results, and this other motor I would think maybe even a little more than 30 hp.
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I think there is something really wrong with the dyno. The 499 engine has almost the same numbers as my 496 with bad port job cast iron #16 SD heads. Also, it is running a smaller cam - 242/248/112. Numbers were 519.4 HP @ 5,200 and 578 TQ @ 4,200. My engine was on a known stingy dyno. The 499 CID engine should of blown the doors off my 496. Definitely something wrong with this dyno. The engine jhein had built should be showing better numbers. I agree with scott70.