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Old 01-24-2012, 04:11 PM
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Whats the word on carb adapter plates?

Switching from a quadrajet to a square bore carb. Ive heard mixed things about adapter plates. I need it to run reliably as its my daily driver until I finish rebuilding my tired quadrajet. So, will I lose a ton of horsepower? A little loss wont bother me I'm more worried about efficiency at this point.

Your thoughts!?!?

Thanks!

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Old 01-24-2012, 04:40 PM
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Quote:
Originally Posted by caminoguy
Switching from a quadrajet to a square bore carb. Ive heard mixed things about adapter plates. I need it to run reliably as its my daily driver until I finish rebuilding my tired quadrajet. So, will I lose a ton of horsepower? A little loss wont bother me I'm more worried about efficiency at this point.

Your thoughts!?!?

Thanks!
if its only on there until you get the q-jet rebuilt whats the difference?
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Old 01-24-2012, 06:55 PM
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I kinda just want to try a couple other carbs first. If I can just throw one on there and be done with it Ill do it.
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Old 01-24-2012, 06:58 PM
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stick with the q-jet, if properly set up, its one of the best carbs there is
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Old 01-24-2012, 07:00 PM
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Quote:
Originally Posted by matts37chev
stick with the q-jet, if properly set up, its one of the best carbs there is
X2 with Matt on this.



Cole
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Old 01-24-2012, 08:16 PM
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I like tne Q-jet when it works right, a spread bore is the best thing to have on a mild street car as long as the shafts are in good shape ie no air leaks .
why put a square bore on it it only takes a few hours to rebuild the carb.
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Old 01-25-2012, 12:33 AM
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I'm totally for the Q jet. However, Ive never rebuilt one and honestly don't want to (this thing is really rough and I have no idea what its set up for). And Ive got a brand new square bore carb sitting on my bench. So do adapter plates suck? that's all I wanna know. Just kinda playing with what I have at hand. I have a brand new adapter plate. My dad had one stashed in the basement.
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Old 01-25-2012, 12:58 AM
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What are you running for an intake manifold? that may have a bearing on this discussion.
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Old 01-25-2012, 10:56 PM
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Stock intake. 1972 GMC 4bbl. has dart iron eagle heads with 2.02 valves
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Old 01-25-2012, 11:13 PM
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Get rid of that stock intake,at least use an Edelbrock 2101 Performer which has both bolt patterns rather than use a restrictive adapter,used Performers are common on craigslist and ebay in the $50 range,that way when you switch back to the Quadrajet you will still have a decent intake with the good heads you have already.
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Old 01-26-2012, 10:35 AM
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To answer your question, spacers are strictly experimental in my opinion. You never know what will work until you try it. Don't expect miracles either, just a few hp either way.
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Old 01-26-2012, 01:21 PM
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I like Qjets just fine, also like Holleys. Prefer no adapter, but I've used them before. I honesstly I doubt you'll even notice a difference between with or without a 1" adapter.
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Old 01-26-2012, 02:05 PM
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The only reason I choose to run a spacer is to get some insulation between the carb base and that engine temperature intake. If that Q-jet works fine now, a $35/kit and rebuild will freshen it up - or why not just go to Summit and buy a reman for $300, new $400 or Rock Auto for $195 for a reman.....not cheap, but a lot better then experimenting with a unknowns for a daily driver if you are not experienced in carb rebuilding.
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Old 01-26-2012, 03:00 PM
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Most spacers

only show up on the dyno and not seat of the pants type HP we did all kinds on Dirt track cars small increases in torque and HP some times a loss. Like one said all experimental
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Old 01-27-2012, 06:12 PM
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I have a computer controlled Qjet on there now. The computer is no longer hooked up. Its brain dead but its getting me to work right now. the well plugs in that are leaking really bad and the throttle shafts leak. Mirraculously it runs okay but its lean at top end. I was toying with an older (early 70's) Q jet with mechanical secondaries. That's the one I want to rebuild. All it did was back fire and speratically change rpm's. vacuum leaks up the yang. Both primary and secondary throttle shafts are leaking like sivs. 18 In. vac. with a very unsteady reading. .....yeah. I might just get an intake but if I do I want a good one and its not in the budjet right now. not to mention if it comes off im gonna want to change the crappy lifters out for Rhoads too so its quite the bill. just looking for enough power to get up the hill and a decent idle. So... sunday Im gonna try the adapter gig and see what happens i guess and go from there.

Thanks for the heads up.
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