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Thread: cfm needed for mildly built 307
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04-06-2008 #1
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cfm needed for mildly built 307
is a 600cfm holley street hp carb enough to feed my engine (specs in sig) or should i go to a 650cfm proform street carb or a 680cfm quick fuel carb? what is the best performing with my combo?
307ci sbc
351hp/346tq
274h cam
torker2 intake
882 160cc 1.94/1.50 heads
holley 650
hooker headers
soon to come
1" carb spacer
pertronix HEI flame thrower kit
1.6 roller rockers
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04-06-2008 #2
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Depends on the specs. I ran a 600cfm on my mild 327 for a long time. When I switched to a "stock" Holley 650DP, it liked it fine. Mileage just went down.
04-06-2008 #3
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whats specs do you need?
Originally Posted by cad
307ci sbc
351hp/346tq
274h cam
torker2 intake
882 160cc 1.94/1.50 heads
holley 650
hooker headers
soon to come
1" carb spacer
pertronix HEI flame thrower kit
1.6 roller rockers
04-06-2008 #4
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Check out Holly's nice online tool:
http://www.holley.com/applications/C...bSelection.asp
My guess a 600cfm carb would be plenty for your motor. For street use much better to under carb than to over do it.
04-07-2008 #5
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The 600 cfm carb should be big enough for your motor unless youre planning to race it, the 274 cam is a good choice, with gas prices being over 3 dollars a gallon, Id stick with the 600. Better off idle and cruising too!
04-07-2008 #6
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600 should be plenty big...
JC Scott
04-08-2008 #7
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600 is plenty. I run a 600 Holley with a mild RV cam in a 390 Ford FE and it works fine.
Nick R.
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04-09-2008 #8
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i think im gonna get a 600cfm proform street carb... has anyone had any expieriance with this carb or manufacturer? Originally Posted by tony byram
307ci sbc
351hp/346tq
274h cam
torker2 intake
882 160cc 1.94/1.50 heads
holley 650
hooker headers
soon to come
1" carb spacer
pertronix HEI flame thrower kit
1.6 roller rockers
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