305 intake

[luxeryvic]

hi, ive got an 86 305 right now ive got a mild cam in it headers, but everythin else is stock. i found a cheap edelbrock performer intake and i was thinkin bout gettin an edelbrock carb to, on this engine is it worth swithching the intake how many more horses wod i get from the switch or do i not bother and just switch the carb

[Scrapper]

Originally Posted by luxeryvic

hi, ive got an 86 305 right now ive got a mild cam in it headers, but everythin else is stock. i found a cheap edelbrock performer intake and i was thinkin bout gettin an edelbrock carb to, on this engine is it worth swithching the intake how many more horses wod i get from the switch or do i not bother and just switch the carb

if your going to put a edelbrock carb i would go for the intake to.

[luxeryvic]

yeah but wood it be worth the time and money to switch the intake on a mostly stock 305 would therebe any power improvement

[Scrapper]

Originally Posted by luxeryvic

yeah but wood it be worth the time and money to switch the intake on a mostly stock 305 would therebe any power improvement

i doubt it but eld and eld got's together. just put a 750 holly on it and use old intake.

[MrPbody]

The factory EGR aluminum intake isn't all that "bad". We've used them to "upgrade" certain "class" racers that MUST run a factory intake. Performer is good on 305. RPM is "too big".

The Q-Jet is FAR superior to the E-carb when properly built. A pre-copmputer carb (non-feedback) would be best, IMO.

A 750 Holley, if not a "vacuum" secondary, is far too "big" for a 305. The Q-Jet will again, out-perform it. Even though the Q-Jet is 800 CFM, it has a secondary air valve that controls how much air/fuel is ingested. The carb won't supply any "more" than the engine is "asking" for.

IMO

Jim

[luxeryvic]

thank you mr pbody ok so i will run the performer and i do have a q jet on it now but my problem is that i can seem to get it to run right after rebuilding it many times so i was thinking of getting a new ready to run carb and put it on, i was thinking an edelbrock 650 but wat do you think

[MrPbody]

Honestly, I think you need a good Q-Jet builder's help. When properly "done'" Q-Jet is the best. Period. Dont feel bad, though. MANY have thrown their hands up and walked away from a Q-Jet. Therre's a book available now from SA Designs, written by Cliff Ruggles. Good Q-Jet man and good info in the book.

We've seen significant issues "tuning" the E-carbs. They're loosely based on the old Carter AFB. The Carter, IMO, is a better carb.

Holley offers a 390 CFM 4-bbl., but it ain't "cheap"...

Jim

[luxeryvic]

i have a book and am getting sick of tuning and rebuilding i want to get somethin that is easy to tune and ready to run and the guys at our local speed shop say that a 600 edelbrock with vacuum secondaaries will work the best for a street car besides we dont have any carb guys around here

[777stickman]

I 100% agree with Jim on the Q-Jet. When he says "properly "done"" that would include new throttle shaft bushings (big time vacuum leaks) and sealing the main jet bowls.

I also agree with going with a small cfm vac secondary Holley over the E-carb.

Keep in mind that you will need an adapter plate to convert a square bore carb to the performer spread bore holes.

Summit Racing web site has a great tech page for sizing carbs for different sized and camed motors and in your case smaller is much better that bigger.

Good luck to you..........THE 57 3CAR

[snshddog]

I agree with almost everyone here. I love the Q jet. There is a reason it was used for so many years but they are hard to get parts for. For a good replacement carb I would go with the E carb. They are really easy to tune and hold a tune very well. And the design has been used since the 40's it has a long history of reliability and in years to come you can get parts since eidelbrock took in the design. I agree there is nothing wrong with the intake unless you are full out racing and the E carb will bolt up with no adaptor plate.

[rodgerturner]

If you get yours rebuilt, I highligh recommend these guys...

customrebuiltcarbs.com

[rickpilgrim1]

We ran the same EDL 1406 carb on the 305 at first and now the 350. tuned it according to the book instructions and here we are 6 yrs later, 1-2 pumps to start, as soon as it starts drop in gear and go, no hesitation or stumble or problems whatsoever, open element air cleaner, no heat in the intake, northern WI weather. When my kid put the edelbrock intake on his L69 305 with the stock Q-jet you really couldn't feel it, at least without a dyno.
If it was me I'd go with a Edelbrock 1404 carb on no bigger than a performer intake as on a 305 smaller is better IMO

[Tony Silva]

Before you put the edlebrock intake on the engine, cleanly grind away some of the aluminum that seperates the intake plenums right in the center of where the carb will be mounted.