327/300 carb CFM

Mark Yacavone · 05-03-2013, 01:11 AM

Anybody know the CFM rating on that (AFB) carb ?

SStockDart · 05-03-2013, 02:04 AM

Mark, I am 99% sure it is 575 CFM....I was planning on putting a 300 HP in this Nova for SS/IA when finances (and too many cars) got in my way....LOL

Chuck Norton · 05-03-2013, 10:53 AM

Mark,

I was never sure of the rated CFM but it never seemed to be able to produce the extra 50 horsepower on the 327 that the General assigned it. On the other hand, if the 300 horsepower manifold had never been cast, where would the 283 cars have ever found that last 50?

c

Billy Nees · 05-03-2013, 11:13 AM

Quote:

Originally Posted by Chuck Norton

Mark, On the other hand, if the 300 horsepower manifold had never been cast, where would the 283 cars have ever found that last 50?

Something else that should be "fixed".

Mark Yacavone · 05-03-2013, 11:57 AM

Thanks...So it's 15 hp in a 65 Chevelle as of now ... roughly 180 lbs in J/SA over a 4GC..
I don't see it carrying that difference...Of course, without a dyno sheet.....???

Aubrey N Bruneau · 05-03-2013, 03:01 PM

Yes, I believe it IS 575 CFM. EXACTLY the same measurements as the dual 4 barrel carbs on a 409.

Dan Lattimore · 05-11-2013, 08:58 AM

Quote:

Originally Posted by Mark Yacavone

Anybody know the CFM rating on that (AFB) carb ?

Mark, Cupp has answers to all those questions. Dyno comparisons, on track back to back, every trans. and rear gear combination you can think of. We have MIR again on Monday and he will be beating the tar out of the green bean again. ------ I'm going to quit parking beside him----------Danny

Greg Reimer 7376 · 05-11-2013, 10:31 PM

Seems to me that the 409 340 horse engine of 1963-65 had a BIG 4 jet on it. 394 Olds motors and the big Buicks got it as well. Heard of a fellow putting one on a 283-220 horse and getting a BIG quantum jump in horsepower with it. I had a 65 Impala SS convertible with a 409 340 horse and a 4 speed, but I ran an AFB on it,since they were easier to maintain. That car was a real road monster with the 3.31 gears, and it would tow about anything. Nothing like torque.

05-03-2013, 01:11 AM	#1
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,810 Likes: 2,901 Liked 5,114 Times in 1,948 Posts	327/300 carb CFM Anybody know the CFM rating on that (AFB) carb ? __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

05-03-2013, 02:04 AM	#2
SStockDart VIP Member Join Date: Dec 2007 Location: Arizona, Texan forever Posts: 1,176 Likes: 878 Liked 574 Times in 212 Posts	Re: 327/300 carb CFM Mark, I am 99% sure it is 575 CFM....I was planning on putting a 300 HP in this Nova for SS/IA when finances (and too many cars) got in my way....LOL __________________ Gary Hansen - SS/FA 4911, B/SA 4911 Last edited by SStockDart; 11-18-2015 at 07:22 PM.

05-03-2013, 10:53 AM	#3
Chuck Norton Member Join Date: Dec 2001 Location: Covina, CA Posts: 474 Likes: 106 Liked 89 Times in 19 Posts	Re: 327/300 carb CFM Mark, I was never sure of the rated CFM but it never seemed to be able to produce the extra 50 horsepower on the 327 that the General assigned it. On the other hand, if the 300 horsepower manifold had never been cast, where would the 283 cars have ever found that last 50? c __________________ Chuck Norton

05-03-2013, 11:57 AM	#5
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,810 Likes: 2,901 Liked 5,114 Times in 1,948 Posts	Re: 327/300 carb CFM Thanks...So it's 15 hp in a 65 Chevelle as of now ... roughly 180 lbs in J/SA over a 4GC.. I don't see it carrying that difference...Of course, without a dyno sheet.....??? __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

05-03-2013, 03:01 PM	#6
Aubrey N Bruneau Member Join Date: Sep 2003 Location: South Eastern Alberta, Canada Posts: 311 Likes: 6 Liked 7 Times in 3 Posts	Re: 327/300 carb CFM Yes, I believe it IS 575 CFM. EXACTLY the same measurements as the dual 4 barrel carbs on a 409. __________________ Aubrey N Bruneau 6409 C/S 62 BelAir sport coupe, 409 HP 409

05-11-2013, 10:31 PM	#8
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,135 Likes: 172 Liked 704 Times in 218 Posts	Re: 327/300 carb CFM Seems to me that the 409 340 horse engine of 1963-65 had a BIG 4 jet on it. 394 Olds motors and the big Buicks got it as well. Heard of a fellow putting one on a 283-220 horse and getting a BIG quantum jump in horsepower with it. I had a 65 Impala SS convertible with a 409 340 horse and a 4 speed, but I ran an AFB on it,since they were easier to maintain. That car was a real road monster with the 3.31 gears, and it would tow about anything. Nothing like torque.