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#1 |
Registered User
Join Date: Oct 2008
Location: Dallas
Posts: 3
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Square Bore Carb. and spread bore intake manifold
Hello all... Newbie here, I have a spread bore intake manifold on my 83 C10 pickup, I was going to rebuild the Qjet carb, but decided to purchase a new Edelbrock performer series carb. 1406... My question is I bought the Mr. Gasket (#1932) Open adapter to put my carb on the spread bore intake. After getting home and reading the Edelbrock instruction they say not to use the open adapter and only use the Edlebrock Quadrajet adapter kit. The open adaptor costs $15... The Edelbrock runs $45, does it matter or is Edelbrock trying to get me to spend an extra 30 bucks?
Thanks for the info. |
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#2 |
Senior Member
Join Date: Dec 1999
Location: Knightstown, in, usa
Posts: 2,525
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Re: Square Bore Carb. and spread bore intake manifold
The open adaptors sometimes leave an open space, where the carb doesn't seal, creating a vacuum leak. The E-brock adaptor should work much better, as it should be engineered to route vacuum signals better. The best bet, is a good squarebore intake.
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1970 long fleet, 355 4 speed, primer, walnut goodies |
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#3 |
BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: Square Bore Carb. and spread bore intake manifold
Buy a four hole swirl adaptor!! I used one on a stock manifold. Worked great!!
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#4 |
Registered User
Join Date: Oct 2008
Location: Dallas
Posts: 3
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Re: Square Bore Carb. and spread bore intake manifold
Thanks for the response. I went a picked up the square bore adaptor looks like it's going to fit great.
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#5 |
Registered User
Join Date: Oct 2006
Location: iowa
Posts: 722
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Re: Square Bore Carb. and spread bore intake manifold
just putting in my 2 cents here....i was using the Mr. Gasket open spacer on an old truck of mine for the same carb. and was having issues so i switched to the 4 hole spacer....it makes a HUGE difference... the 4 hole spacer is much better
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"Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles ![]() '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L ![]() ![]() ![]() |
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#6 |
Registered User
Join Date: Jul 2008
Location: Ault, Colorado
Posts: 862
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Re: Square Bore Carb. and spread bore intake manifold
Yo! I've got 30,000+ miles on the '76 Camaro I custom built with a 625 Carter AFB, 1" spacer, and 8004 Weiand manifold. Square to spreadbore. Works perfect and I get 15.5 mpg with a 350hp/411ftlb torque motor.
Why screw with perfection? So I built a nearly identical 350 ci motor for my 3/4 ton 4x4 '78 Chevy P/U,...Holley 600, 2" swirl squarebore adapter, and 8004 Weiand spreadbore intake. Again, perfect! We'll see what 6200 lbs and 4.11:1 rear gears does for the gas mileage in this truck! Todd. |
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