Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine> What size carb should I use?
User Name
lost password?   |   register now

Thread: What size carb should I use? Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
07-10-2002 10:23 AM
1FST2M6 sweet.. wasn't aware of the formula! that'll come in handy! so obvious but obviously i wasn't thinking...

[ July 10, 2002: Message edited by: 1FST2M6 ]</p>
07-09-2002 09:23 PM
Sandman There is a simple calculation to work out the required cfm. Simply: cubes x max rpm divided by 3456. So we know yours is a 350 ci so say for your max rpm is 6000, 350 x 6000 = 2100000 divided by 3456 = 607 minimum so in this case I would go for the 650 cfm. If you want to build higher revs say 7500, 350 x 7500 = 2625000 divided by 3456 = 760 so you woud just get away with a 750. So as you can see it is all dependant on revs. The same equasion applies even on a blown motor, I have a 400 sbc running a 6-71 blower @ 6500 revs, so 400 x 6500 divided by 3456 = 752, so we run a 750 cfm..

Hope this helps

07-09-2002 02:28 PM
F-1Rodder Technically speaking it depends on the maximum rpm you will be running. But off the cuff, I would say that a 650 or so would be plenty for your mild motor.
07-09-2002 10:09 AM
1FST2M6 the 750 is way to much carb for your application.. a demon 625 or a holley 650 with tiny primary jets would do the trick jsut fine.. you'll have just over 300lbft at the ground.. no need to waste fuel and $ with a bigger carb.

12.92@109mph out of a 2.8 automatic... whats your excuse?

[ July 09, 2002: Message edited by: 1FST2M6 ]</p>
07-07-2002 08:31 PM
4 Jaw Chuck My opinion....Holley 750 DP.
07-07-2002 08:22 PM
What size carb should I use?

I have a 350 out of a 85 vette that I'm about to drop in my 87 S10. The motor is stock internally except for the 280H comp cam and double roller timing chain. I'll be running a Holley street dominator intake (single plane) with headers. I'll probably use a Holley double pumper carb but should I go with a 650 or a 750. Is there that much difference between the two? The tranny is a Turbo 350 with the stock converter and the truck will only come out on the weekends. Any help would be appreciated. Thanks, HRS10

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 07:09 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.