General Category > Quadrajet Carb Talk and Tips
Edelbrocl 1910
kelley555:
Cliff,do they make a sq. bore to q-jet spacer like the one your talking about,semi open?Who makes it? I thought it was going to be trial & error,when it came to the installing the adapter/spacer. I have no exprience with the q-jet's installing an adapter/spacers,whether,it's open;4 hole or semi open. Which one will work for the quadrajet you've been there.Later Kelley
Cliff Ruggles:
A full divider can be made/inserted into any spacer or adapter. I'd start out fully divided if the intake has divider in it. Then experiment with "notching" it between the secondaries, etc.....Cliff
kelley555:
Ok thanks Cliff, I'll start looking around for an adapter with a removable divider & go from their. I remember the old Weiand Excellerator intakes had a divider that you could slip the divider in the notch & tune them.I'll make a 2nd divider & start playing,start with a small radius notch & go from their. The car's pretty heavier at 3400 lbs. empty,so we need all the help getting the lead sled moving & stop the turbelence before that causes a tuning problem. Thanks for the advice.Happy holidays & merry x-mas to your family, Kelley.
omaha:
hey kelley555, how ya doin. (that sounds like i'm from Jersey or somethin) Anyway, on that divided spacer deal, there is a good readings on this subject in Jim Hand's Pontiac book. He tells ya how to make spacers and the experiments he did with them. Actually the book has some excellent info that could apply to any make of engine, not just Pontiacs. The tuning section is just worth the price of the book itself. I dont usually pimp too many books but this one has alot of info gained from alot of experience. BTW, he made his own spacer out of white pine and a roll of gasket material and some adhesives. seeya dude!!
kelley555:
Omaha,I played with a lot of different spacers in the 70's & early 80's with Holley carbs with single plane high reving Sbc ,not any Q-jets though. This was a all out drag motor & car,not a street driver.I wish we had the head technology back then,we have today. To show how one can over carb an engine,I built 3 different Dp Holley's 750;800 & 850 in the 70's. I made runs on the same day with the same type car/motor/conditions & traction scienced that out & made the conclusion.If there ever was a 355 ci. that should have benefited from a larger cfm carb,it should have been that .720 lift;288/294 dur. @ .050 lift cam;high compression; 4 sp engine .The car ran more MPH & better Et. with the smaller Holley 750 dp . All 3 carbs we're setup right,not nit sh--ted,but the heads we're pretty good for the day. It's a diifferent ball; game with this engine,it will probably never see 6000 rpm with these cubes,probably 5500-5800 max. The heads just want support the cubes. I checked early this am & didn't see much for the holley sq. pat. to the q-jet adapter. I'll probably mill a slot in the open spacer. Measure how many thousandths below the carb mounting surface the intake divider is. The center divider is slightly recessed so I'll fab a divider the same width as the intake & ht. of the adapter + how far the intake is recessed. I'll probably start with a small radius notch & leave it,as per Cliff's suggestion. If the car has trouble hooking from too much tq. ,maybe decrease some power by moving the power band up slightly.Later Kelley
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