[HWYSTR455]

Originally Posted by steve25

So your saying your 350 Olds fitted with a 670 cfm avenger flattend out above 4800 due to lack of CFM / being too small for that motor?

I would like to refer you to a dyno test done on a factory Tripower built up 421 that made 475 hp, yet still made 350 hp up at 5500 running on just its center 2BBl !!

A gotta say for sure you had something going on with that 350 Olds that was cutting into power above 4500 ( like jetting ) but it sure was not CFM.

The poorer idle of that 770 was likely due to the idle air bleeds needing to be changed I would say .

I drove that car on the Power Tour, and when going over some mountains it was overheating. The Holley crew stopped and we jetted it up by 4 sizes to control it, but once I came out of the elevation it was pig rich.

I juggled jets in that car well before going on the Power Tour, and no matter what I did it was never 'right'. Even the Holley guys made comments and suggested going to the 770.

It may not have been due to CFM, but the Holley guys recommending the 770 made me think it was.

My 1/2" fuel line thread was based on that car, so delivery was not an issue, for sure.

It had #5 69 heads on it that were ported.

The tbi setup allowed me to tune it all out, wasn't going to waste time with elaborate tuning of an off the shelf 'budget' VS Holley.



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