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In conjunction with a Performer intake (idle to 5500)on the relatively stockish 351C, I'd like to mate a Holley 750. Ordered a 1/2" phenolic 4 hole spacer rather than the open spacer in hopes to promote velocity at cruise/mid rpm.. Yes/No?

Looks like that intake has little to no shared plenumn right to left, I'm leary to introduce a 1/2" open sparer in fear of what was designed into the intake. Comments are welcomed..

thanks..
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"Cold" being 76.15* there?? LOL

Just kidding...

Thanks, I have the 1/2" spacer. Man, it sure looks like more than that in the package.

BTW, I really need to get back there, hard for an East Coast married father of 2. We were at the Wacaloa (sp?) Hilton for a few weeks 2 years ago, had a great time. Absolutely beautiful. You're a lucky SOB!! ;^)
You chose well

An open spacer is a tuning device for an open plenum intake. The 4 hole spacers can help an open plenum intake too, but are a necessity for someone not wanting to change the tuning of a 2 plane intake. It sounds as though you were only looking for a heat insulator, and for that purpose your choice was spot on.

your friend on the DTBB, George
WRT Spacers and horsepower...

I've read several real-life dyno tests where they tried to establish if a spacer hurt or helped hp. Skipping all the details, which I can't remember anyway, and getting to the result which is really what interests us, the answer is "it depends".

The point of the article was that the only way to tell if a spacer will help on YOUR engine is to try it, then put it on a dyno to see. They were unable to separate the variables sufficiently to say "If you are running such-and-such cam, or intake, or whatever, a spacer will ALWAYS help".

So Johnk, I think the only way to find out what it will do on YOUR engine is to try it. In the experiments I've seen, the results have not always followed the predicted result very well.
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