RCR'S 67

Looking for some advice.

I have a set of Holley 660 center squirters going on my small block. Now I have heard that it doesn't = 1320 is this true? what would it work out to be CFM wise.

If it is too much for the small block can these 660's be jetted down?

I have a 327 small journal w/ 10:1 comp, 2.02 heads, .490 lift cam, weiand hi-ram tunnel ram, gear drive, h-beams, roller rockers.

mrdragster1970

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Sounds like too much for such a mild motor. I'm no expert, but my crew chief had dual 660's on a 468", & 750's on a 496".
Both big rollers, 13-1, & ran great. Maybe someone with more knowledge will post. You might be able to trade down,
if that's the right combo for such a small motor.

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RCR'S 67

Thanks for trying mrdragster. Thats what Im thinking, it wil be to much.

Maybe IM posting in the wrong section or forum! Figured there would be a few replies on this.

mrdragster1970

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Not much on this site except the kids with their modern engines & cars. Very few old, BBC, track only, guys like me. Good luck.

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Chevy406

iTrader: (12)

That is way too much carb for a 327 that is built for 5,500 rpm. You would be optimum with just one 600 or at most a 650 Holley. Multiple carbs look way cool, but it is difficult to get them to even match the performance of a single carb on a street engine.

cook_dw

iTrader: (16)

You need to be using the 0-9776 (450 cfm) carbs if anything but that with a tunnel ram you would only see optimum power between 4500 - 7000 rpm. I would tell you that a tunnel ram is too much on a 327. And as far as a single carb with the cubic inch being what it is I would tell you to go with a single carb intake and a Street\Avenger 570 carb. Part # 0-80570.

Just for future reference to figure out cfm on an engine a rough caluclation would be cubic inch x max rpm / 3456 and that will give you 100% effeciency which you will not see with stock heads and a short intake runner and a mild cam. Typically if an engine has aftermarket larger intake runner heads and a decent cam and longer intake runners I would add another 100 or so cfm to that calculation.