hoogabooga

iTrader: (1)

I am going to get a 670 avenger series carb for my car and i want to use the 4160 holley on it for my truck. As far as i know it is the stock intake for a 86 gmc p-up The q-jet is just wore out. No comp and egr is blocked off.

Will the 4160 fit on a gm intake?

thanks

Apeiron

The 4160 is a squarebore carb and won't fit directly on your stock spreadbore intake. You'd need to use an adapter.

Damon

Trying to put anything other than a QJet onto a stock QJet intake is a bad idea- they are a "4-hole" design that matches up perfectly with the big-n-little throttle bores of a QJet, but with nothing else. You CAN adapt it, but the mismatch is pretty severe and just doesn't look like something that would work very well.

spartyon

You can use the q-jet holley replacements, model 4165 carbs. The 6210 version is the most popular of those and is a 650cfm double pumper. They match perfectly since the baseplates are the same.

The adapter for the 4150/4160 carbs matches up fine. Personally I like it a little better as it directs the mixture to a more "centered" area of the intake and makes for a more "consistent" path through the runners as opposed to the big-n-little where the secondaries seem to put more through the rear portion of the intake. Not as evenly spread out as 4 even sized and squared butterflies. Both work well, not really a problem to seek a solution to.

five7kid

iTrader: (14)

Why, oh why, do people do this to themselves?

(I know it wasn't the question asked, but I had to. . .)

hoogabooga

iTrader: (1)

Thanks for the info.


five seven, enlighten me please...

five7kid

iTrader: (14)

The Street Avengers are nothing more than over-priced vacuum-secondary carbs. If you really think you need vacuum secondaries (and you probably don't), then just get a standard universal VS Holley, put a 4160 to 4150 conversion kit and the quick-change spring housing on it (the Quick Fuel adjustable secondary housing is much, much better), and you've got the same thing for a lot less money.

If you want a "real" performance carb, choose a properly-sized double pumper. Vacuum secondaries are for tow trucks and people who think if big is good, bigger is better.

hoogabooga

iTrader: (1)

hmmm.. They are expensive. I want a mech. secondary but when i went to holleys website theeir diagram said i needed a 850???? I KNOW my engine doesn't need one that big.

I have a gw 350 bottom end, decent al. heads with 190cc runners, xe274, and hei. Hooker comp. cer. headers in 2 weeks . I was thinking 650 dp.


forgot to mention 2400 stall

five7kid

iTrader: (14)

The XE274 deserves a better intake than a stock GM piece. You should really consider a Performer RPM. Anything less and the cam will hurt low RPM power where the intake is doing its work, and the intake will hurt high RPM power where the cam is doing its work. Basically, you would have a very narrow powerband.

A 650 DP will work very well on that combo (with the better intake, that is). What the Holley website was saying is your combo would "tolerate" an 850 DP, not that it "needs" it. A 750 DP would probably be the better full-power carb, the 650 DP the better driver carb.

hoogabooga

iTrader: (1)

Thanks for the help. My car has a holley intake, the truck has the gm piece.

I'm looking at the summit catalog now.

bluegrassz

iTrader: (3)

I have a good 750vs Speed Demon in my sig for sale if you are interested!

five7kid, I have one of the Quickfuel adjustable units. I have been running it, but I am not clear on the best way to adjust it. Trial and error?
Do you have any advice?

five7kid

iTrader: (14)

Adjusting the Quickfuel unit - I haven't run it since 2003, but what I remember is it comes with a medium spring. I'd put a light spring in it, I forget their recommended starting point adjustment, but just turn it out until you start getting bog, then turn it back in until it goes away (remember - if you can "feel" the secondaries opening, you're bogging).

I guess you could call that trial & error.

bluegrassz

iTrader: (3)

I didnt relize that I could change the spring out also. I though the only adjustments were with the screw.

I will be going to the track maybe friday. I will give it a shot.

Thanks.

hoogabooga

iTrader: (1)

I found this 1. It has the 4 holes. I would rather use my almost new holley instead of having a rebuild or buying a new.

Edelbrock Carburetor Adapters: EDL-2696 - summitracing.com

Rick King

ude the mathimatical formula to find out what cfm you need and then tune the carb from there for best results, jets, booters
this is true"The Street Avengers are nothing more than over-priced vacuum-secondary carbs. If you really think you need vacuum secondaries (and you probably don't), then just get a standard universal VS Holley, put a 4160 to 4150 conversion kit and the quick-change spring housing on it (the Quick Fuel adjustable secondary housing is much, much better), and you've got the same thing for a lot less money.

If you want a "real" performance carb, choose a properly-sized double pumper. Vacuum secondaries are for tow trucks and people who think if big is good, bigger is better."