Quick Carb Question

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Quick Carb Question

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Quick Carb Question - 9/18/2006 11:45:41 PM

Slayer

Posts: 544
Joined: 8/19/2006
From: Wichita, KS
Status: offline

I really don't think it'll make a big difference, but I'm looking to see if someone else has another opinion. Alright I have a 355, approx. 365 Hp, Edelbock air gap intake, and a lil head work done. The compression is 9:1. cam has 234/244 duration 488/510 lift. Right now i have a 600cfm double pumper on it. What difference would it make to put a 650cfm on it? I think 700 is to big, but any suggestions will be appriciated, Thanks

Post #: 1

RE: Quick Carb Question - 10/10/2006 11:42:43 AM

Doc

Posts: 8
Joined: 10/10/2006
Status: offline

You can find the formula to calc the size of carb you need for the engine you have online. Google for it.

I doubt you are going to go too big with a 700cfm, but find the calc formula for it anyway. It will certainly help you narrow it down a large amount. If the value you get is in between the sizes then upsize to the next larger unit.

This is a generally accepted formula, and I had to find it....sorry for the delay.

VE = (displacement x rpm)/3,456

This is the article I foudn it in, and you might want to read this. The test involved a reasonable street engine, and carbs ranging from a 390cfm to a 1000cfm. Pretty interesting stuff, even if I have made all these mistakes years ago.....lol.

http://www.chevyhiperformance.com/techarticles/148_0403_seven_holley_carbs_test/

Good luck!!!!

Doc

(in reply to Slayer)

Post #: 2

RE: Quick Carb Question - 10/14/2006 9:35:08 PM

Slayer

Posts: 544
Joined: 8/19/2006
From: Wichita, KS
Status: offline

Hey thanks man. i just now found that somebody posted something on here. ya i knew about the formulas but the one i knew came up with like 624 and i knew that wasn't right. with your formula its a 686. so thanks alot i appriciate it.

(in reply to Doc)

Post #: 3

RE: Quick Carb Question - 10/16/2006 9:12:37 PM

69camaro1

Posts: 128
Joined: 10/11/2006
Status: offline

I've run a 750 single pumper holley on a stock 9:5:1 compresson 350's and a 350 350 horse, to a 350 horese 396 and they worked well for all of them with the same cfm. I like 750's because they put even 850's on 302's and 750's on 70' z/28s factory so they worked well for me. Is that 9:1:1 compression origianal? If so it was probibly a smogger motor.

< Message edited by 69camaro1 -- 10/16/2006 9:16:28 PM >

(in reply to Slayer)

Post #: 4

RE: Quick Carb Question - 10/17/2006 9:04:23 PM

Slayer

Posts: 544
Joined: 8/19/2006
From: Wichita, KS
Status: offline

No its not orginal

(in reply to 69camaro1)

Post #: 5