what size carb should i run?

« **on:** May 16, 2007, 06:52:01 PM »

im wondering what size carb i should be running on my 454? the one i have on there just doesnt seem to be doing the job. dont know what size it is but it is a holley 4 bbl. dont know what the specs are on the engine but he said it was set up for turbo's so i assume its low compression. it supposedly has a small cam and it has an Edelbrock dual plane manafold. thinkin of may be a 750 or 850 dbl pumper? the one thats on it now is only givin me about 3800 rpm. and once in a while when i stomp on it the rpm's will come alive bt ive only had it do that twice. mostly you stomp on it and it sounds like its starving for fuel. anyways just wondering what you guys thought.

« **Reply #1 on:** May 16, 2007, 07:52:02 PM »

Find out what you have 1st. There are MANY reasons your engine may not be getting enough fuel. From plugged filters to bad lines, to poor fuel pressure caused by these or fuel the pump itself. Your float may not be set correctly on your carb, or the jets may be gummed up and not delivering enough fuel... So as I started with find out what size carb you have and see if it is too small for your application. There is often a metal tab on the carb with the numbers to ID it. Or just put a good pic and I'm sure someone can get close just from looking at it.

« **Reply #2 on:** May 16, 2007, 08:06:09 PM »

I know on the double pumper Holley's there is a number on the choke's air horn that states "LIST ____", there are four numbers that follow the "LIST". Post those four numbers and I can tell you what it is. However, if the carb is anything different than the double pumper I don't know jack sh!t. Like Chaz said, take a picture or two of it.

« **Reply #3 on:** May 16, 2007, 08:10:34 PM »

Check your fuel filter! And then make sure your secondaries are opening.

« **Reply #4 on:** May 16, 2007, 08:24:38 PM »

I started thinking secondaries too, after the once in a while when i stomp on it the rpm's will come alive part. If it has vacuum secondaries and maybe a intake vacuum leak... or they are just sticking

« **Reply #5 on:** May 16, 2007, 09:00:49 PM »

My boat had a 750 vac sec and ran real good and was relativly good on gas .

-beerjet-

« **Reply #6 on:** May 16, 2007, 09:02:50 PM »

I have dual 750 vac sec's and it real shitty on gas!

« **Reply #7 on:** May 16, 2007, 09:07:46 PM »

I have a single Edelbrock 750 w/vac sec. and while I have nothing to compare the "gas mileage" to, It seems like I burn a gallon in about 60sec. at WOT

« **Reply #8 on:** May 16, 2007, 09:37:20 PM »

thanks guys ill get some pics up tomorrow. it is a vacume secondary but the guy i bought it from put a rivet in the linkage so they would open about 1/4 of the way at WOT. dont know why.

« **Reply #9 on:** May 17, 2007, 10:05:03 PM »

alringht here we go. i couldnt see all the numbers but i got the pics. anyone know what it is?

« **Reply #10 on:** May 18, 2007, 08:45:25 AM »

On the top picture, very close to or under the sticker that's on the choke's air horn there should be a LIST number.

« **Reply #11 on:** May 18, 2007, 12:28:53 PM »

on the first pic where the white sticker is it should have a number on the sticker or under the sticker thats where it is on mine. thecraz

« **Reply #12 on:** May 18, 2007, 02:38:01 PM »

ok the number was under the sticker.

the number is 80508-1
2090

« **Reply #13 on:** May 18, 2007, 02:44:24 PM »

Sounds like Marc and Chaz got a good carb lesson yesterday maybe ya' could ask them!

!

« **Reply #14 on:** May 18, 2007, 02:51:37 PM »

well from what i can find it is a 750 vac secondary. maybee i just need help tuning it huh?

« **Reply #15 on:** May 18, 2007, 05:20:47 PM »

put a power valve in it

« **Reply #16 on:** May 18, 2007, 08:28:26 PM »

« **Reply #17 on:** May 18, 2007, 09:17:58 PM »

Quote from: sandaddict on May 16, 2007, 09:37:20 PM

thanks guys ill get some pics up tomorrow. it is a vacume secondary but the guy i bought it from put a rivet in the linkage so they would open about 1/4 of the way at WOT. dont know why.

He was trying to limit or restrict the carb, he probably thought it was too big for the engine or he was trying to save gas...

« **Reply #18 on:** May 18, 2007, 09:20:31 PM »

Quote from: HDriderTH on May 18, 2007, 05:20:47 PM

put a power valve in it

Holley carbs have a power valve in them. As far as I know they are the only brand that has them. It's very common for the power valve to blow out when an engine has backfired.

What's up HDriderTH?

« **Reply #19 on:** May 20, 2007, 01:46:19 AM »

well im gonna go to Elsinore in the morning and see if i can get this crap worked out. if anyone wants to join me come on out. i guess if the boat dont run i can look at the wifes big cans all day...(:!

« **Reply #20 on:** May 20, 2007, 11:51:54 AM »

Quote from: sandaddict on May 20, 2007, 01:46:19 AM

i guess if the boat dont run i can look at the wifes big cans all day...(:!

This post is worthless without pics . Until I can approve the cans , theres no guarrantee you'll have a good day.

-beerjet-

« **Reply #21 on:** May 20, 2007, 11:54:38 AM »

I could agree with BJ more....F the carb...wheres the cans???

« **Reply #22 on:** May 20, 2007, 02:21:11 PM »

I agree, wheres the cans? ANd how big? ;Dhahahahhahaha

« **Reply #23 on:** May 20, 2007, 02:42:12 PM »

(.)(.)

« **Reply #24 on:** May 20, 2007, 02:46:44 PM »

well, did it run or do your eyes hard.

sandaddict

The Chaz

hotrod56cars

Marcsrollin

The Chaz

beerjet

Marcsrollin

The Chaz

sandaddict

sandaddict

hotrod56cars

thecraz

sandaddict

Warlock

sandaddict

HDriderTH

sandaddict

hotrod56cars

hotrod56cars

sandaddict

beerjet

Warlock

bkplesh

sandaddict

bkplesh