377 carb choice - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- 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
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 10-06-2012, 02:39 PM
Registered User
 
Join Date: Oct 2012
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
377 carb choice

My dad has a 93 gmc Sierra 1500 with a destroked 400. Has double hump heads with a 2.02 intake valve. What would be a good carb to run on it.? It is mostly street driven.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-06-2012, 03:03 PM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 7,822
Wiki Edits: 0

Thanks: 313
Thanked 749 Times in 720 Posts
750 cfm would be a good size.What type of carb depends on the owner and how its driven,IE: not everyone like double pumper carbs.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-06-2012, 03:05 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,044
Wiki Edits: 0

Thanks: 3
Thanked 367 Times in 361 Posts
Get a 750cfm carb. Can be double pumper or vacuum secondary or air valve sec (Qjet, AFB, AVS)
Your choice. They all will work very well.

dual quads work real good too. Use two 500 to 750cfm edelbrocks on the new Edelbrock RPM dual quad manifold.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-06-2012, 03:34 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,898
Wiki Edits: 326

Thanks: 751
Thanked 983 Times in 829 Posts
Manual trans or auto with 3000+ converter I would use a pumper. Otherwise, I would use a vacuum secondaries carb.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-06-2012, 10:47 PM
Registered User
 
Join Date: Oct 2012
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It has a 600 cfm on it now. Would this not be big enough to feed it on the top end?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 10-06-2012, 11:12 PM
Registered User
 
Last photo:
Join Date: Jan 2006
Location: cornelius
Posts: 690
Wiki Edits: 0

Thanks: 42
Thanked 12 Times in 12 Posts
What kind of cam? Intake manifold? Headers? Exhaust? Stock heads or ported? What kind of RPM's are we talking about for the top end? You kinda need a real good idea of the combo to actually recommend a carb.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 10-06-2012, 11:15 PM
Registered User
 
Join Date: Oct 2012
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I have no clue what cam it has. It was in it when he bought it. It has a holley contender intake. Stock manifolds for now but he will be getting headers. Has double hump heads. Stops gaining rpm at 6000 rpm. From what I have read the 377 should be good for 7500-8000 rpm.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 10-07-2012, 12:19 AM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,655
Wiki Edits: 0

Thanks: 15
Thanked 59 Times in 56 Posts
While you've read the 377 can rev high, the cubic inches and the bore and stroke have nothing to do with how high it will rev. Rev is controlled with a iron fist by the valvetrain. If the cam runs out of breath at 5500 RPM, valve float will only be maybe 1000 or less RPM. Not just the cam plays the role, the valve springs play a huge role. Lets say you have a cam that says it's power band is 2000 - 6000 RPM. That means that it will effectively stop making power around the 6000 RPM range. However if you were to take a engine and slap a cam and valve train in that would rev to 8000 RPM, the next thing you have to consider is will the rods, crank and pistons hold up at that high RPM. Since it's got a contender intake which has a spread bore carb flange I would go with a Quadrajet.
Summit racing carry these carbs. Jet has a excellant line of Q-jets as does Sean Murphy Induction. When you have a good Quadrajet you get the best of both worlds. It's small primaries make for sensitive fuel injection like throttle response and good fuel economy. The massive secondaries are there when wide open throttle performance is needed.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 10-07-2012, 02:49 PM
Registered User
 
Last photo:
Join Date: Jan 2006
Location: cornelius
Posts: 690
Wiki Edits: 0

Thanks: 42
Thanked 12 Times in 12 Posts
The 377 is typically a high RPM engine but without knowing the cam, and valvetrain specs its hard to say what the RPM range should be. unless your willing to disassemble the engine and check it out, along with looking at the connecting rods and pistions I personally would never try and rev it to 7500-8000 rpms.

First thing I would do would be add a quality set of long tube headers, and a good high flow exhaust system. Stock manifolds will kill upper rpm performance. On an engine like this I think the Q-Jet would be my choice, just make sure you have it tuned to your engine. That's the real trick
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 10-07-2012, 03:09 PM
mud.man.rj's Avatar
Registered User
 
Last photo:
Join Date: Oct 2010
Location: canada
Posts: 376
Wiki Edits: 0

Thanks: 0
Thanked 24 Times in 24 Posts
Q jet.

Just remember there are also different size Q jets like any other carb, but still stick with a 750 size. Or big block carb.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Carb choice STUDE55DOG Engine 4 04-06-2012 07:19 PM
Carb choice help frankenvette Engine 9 02-19-2008 11:37 AM
help on carb choice.. chevelle4542speed Engine 8 07-19-2007 04:35 PM
carb choice 75sprintguy Engine 7 06-30-2005 09:45 AM
carb choice toolmansson Engine 3 01-15-2004 07:54 AM


All times are GMT -6. The time now is 03:46 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.