455 OLDS BUILD QUESTION

[wskirvin]

I'm currently rebuilding my olds 455. it is .030 with speedpo pistons, not sure of the exact piston my engine builder is using, but he said it will pretty close to 10.1 compression when assembled with my reworked E heads. . this is my cam specs

its an elgin E975p.

i'm trying to figure out what would be the best carb to suit this engine for street use. i do not plan to race it or take it to the strip. it has an edelbrock performer intake and a rebuilt factory distributor thats been all upgraded with pertronix parts. will be using a 200-4r trans and then eventually a 8.5 rearend but for now a rebuilt 7.5 with 3:42 gears till it goes boom. i'd like to find a carb that can support my vaccum brakes, and i know the cam may have terrible vaccum so that may end up being switched out. i was thinking around a 750-800cfm carb would be best but id appreciate anyone's opinions on this.

 

[TURNA]

Does the intake have a square bore or spread bore carb flange on it?

 

[Blake442]

Your power brakes will be fine with that cam.
Performers are spread-bore, so just get yourself a nice new/refurbished Quadrajet and you're good to go.

 

[wskirvin]

any idea what cfm would be best suited? or should i just find and old quadrajet from a 60-70's cutlass and rebuild it?

 

[wskirvin]

Does the intake have a square bore or spread bore carb flange on it?

spread bore, but i have the square bore adapter that came with the manifold from Edelbrock

 

[Blake442]

Most Qjets flow 750-800 and that's right where you want to be.

 

[MrSony]

Quadrajets are spread bore. Get yourself an OLDSMOBILE quadrajet from 76-80, non computer controlled. Most BOP qjets I've encountered were 800cfm.

 

[TURNA]

If you have a spread bore intake I would use an Olds Q-jet.

But before you buy one ask pontiacgp on this site who to get it from.

 

[MrSony]

Don't just get a parts store qjet. It's a waste of 300 dollars. Might as well set 3 benjamins on fire. EverydayPerformance, Quadrajet Power, SMI (sean murphy induction), etc are all good places. Tell em what you have, they'll set you up right. OR, you could grab a $25 core from a junkyard, spend 150, and rebuild it yourself.
Imma learn ya somethin. 1705xxxx qjets are the models with the little silver choke housing hanging off the side. The 5th number is the year starting with 6 for 76, 7 for 77, 8 for 78, 9 for 79. 6th number would be a 2, for a 49 state Qjet. 7th number would be a 5, for the division, in this case it's an olds, so it'd be a 5. 8th number can be whatever. Normally even means it has the nubs on the linkage for an automatic (kickdown cable, etc), and odd meant it was for a manual car, but these basically mean nothing. My Buick qjet ends in a 1 and my olds 403 qjet ends in a 3 and has the nubs. ¯\_(ツ)_/¯
So, in short, carbs like two of mine, 17057252 and 17057253 respectively are both 800cfm olds carbs from '77 403 cars. Qjets were make, model, year, and application specific, make sure you get one that is right for you. Or, go to the aforementioned vendors and have them take care of ya.

I really should paste this somewhere so I have it for future reference... I've written it out like 5 different times. lol

 

[wskirvin]

Don't just get a parts store qjet. It's a waste of 300 dollars. Might as well set 3 benjamins on fire. EverydayPerformance, Quadrajet Power, SMI (sean murphy induction), etc are all good places. Tell em what you have, they'll set you up right. OR, you could grab a $25 core from a junkyard, spend 150, and rebuild it yourself.
Imma learn ya somethin. 1705xxxx qjets are the models with the little silver choke housing hanging off the side. The 5th number is the year starting with 6 for 76, 7 for 77, 8 for 78, 9 for 79. 6th number would be a 2, for a 49 state Qjet. 7th number would be a 5, for the division, in this case it's an olds, so it'd be a 5. 8th number can be whatever. Normally even means it has the nubs on the linkage for an automatic (kickdown cable, etc), and odd meant it was for a manual car, but these basically mean nothing. My Buick qjet ends in a 1 and my olds 403 qjet ends in a 3 and has the nubs. ¯\_(ツ)_/¯
So, in short, carbs like two of mine, 17057252 and 17057253 respectively are both 800cfm olds carbs from '77 403 cars. Qjets were make, model, year, and application specific, make sure you get one that is right for you. Or, go to the aforementioned vendors and have them take care of ya.

I really should past this somewhere so I have it for future reference... I've written it out like 5 different times. lol

Thanks for the info! just sent an email to SMI giving them my engine specs to see what they thought would be best! I had looked that them several times and also looked at the Jet Performance carbs, but they are all foreign to me lol. I had and 87 cutlass 307 in high school and always had issues with the computer controlled quad and put a Edelbrock on it till I got rid of the car (which i'm kicking myself in the *ss for) after that everything I've owned has been fuel injected outside of a ranger with a 302 that had a holley on it.