Carb size 750 or 850?
10-09-2010, 09:24 AM
#1
2nd Gear Member
Thread Starter
Join Date: Oct 2008
Location: NY
Posts: 200
Carb size 750 or 850?
I'm building a 347 stroker with
225cc AFR Heads
Lunati Cam retrofit - Duration 300 int / 310 exh, Lift .560 int /.576 exh
Edelbrock Performer Air-Gap
And would like to know what size holley carb you guys suggest.
Its going to be a street/heavy strip car
Thank you in advanced
225cc AFR Heads
Lunati Cam retrofit - Duration 300 int / 310 exh, Lift .560 int /.576 exh
Edelbrock Performer Air-Gap
And would like to know what size holley carb you guys suggest.
Its going to be a street/heavy strip car
Thank you in advanced
10-09-2010, 09:39 AM
#2
6th Gear Member
Join Date: May 2009
Location: PA
Posts: 5,232
Well, the 750 should be enough unless you plan to exceed 8000 rpm. The 850 would get you to 9000, if your pistons didn't come through the hood first.
Bear in mind, the smaller the carb, the better the throttle response. If this will be a street driver, you'd be better off with a 650.
Bear in mind, the smaller the carb, the better the throttle response. If this will be a street driver, you'd be better off with a 650.
10-09-2010, 09:59 AM
#4
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Join Date: Aug 2007
Location: Elk Grove, CA
Posts: 5,896
Agreed. I have a 600 Edelbrock on my 331 and it works well. I may upgrade to a 650 Demon or QuickFuel in the future, but for now my 600 gets the motor to 6200 rpm just fine. If you're doing mostly strip, I'm sure the 750 would be more than enough.
10-09-2010, 12:43 PM
#5
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Join Date: Apr 2007
Location: California
Posts: 10,468
What are the specs on the cam, and is it a roller cam?
I run a mechanical 650 Quick Fuel on my 302....with annular boosters could have gone 750.
A 347 with heads that big really would work best with a lot of cam, and would then need at least a 750. 850 annular and light internals and throttle response will be great.
I run a mechanical 650 Quick Fuel on my 302....with annular boosters could have gone 750.
A 347 with heads that big really would work best with a lot of cam, and would then need at least a 750. 850 annular and light internals and throttle response will be great.
10-09-2010, 01:29 PM
#6
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Thread Starter
Join Date: Oct 2008
Location: NY
Posts: 200
10-09-2010, 04:49 PM
#7
2nd Gear Member
Join Date: Jun 2008
Location: California
Posts: 441
Thinking about it, I have a 351W with a cam close to yours. I run a 625 Carter Comp and it's great to 6K. 99% of people over carb cuz they think, bigger is better, WRONG! When I was at B&M, we sold a 750 cfm for the blown engines. This is a chart that I have found to be very useful throughout the years, hope it helps you.
10-10-2010, 10:37 AM
#10
6th Gear Member
Join Date: Oct 2006
Location: Cork, Ireland
Posts: 6,417
well i think we all agree on 750ish with that setup. I heard plenty of times that you can go way bigger without sacrificing throttle response when using annular boosters. carbs have improved over the last 40 years. my 302 with a 650 demon doesn't seem to have any overcarbing problems