Performer RPM spreadbore or square?
Thread Starter
Drifting
Joined: Apr 2002
Posts: 1,720
Likes: 19
From: Manhattan Beach Ca
Performer RPM spreadbore or square?
I'm using my Qjet and know that it should use a spreadbore type intake. But the 7104 is more expensive than the sqarebore 7101. So is there a big difference if you use and adaptor on the squarebore for the Qjet? Would I lose hp or CFM? The only thing I can see is an adaptor raises everything and may not fit under stock hood anymore. Anyone check this out?
Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
Your Q-Jet is a spreadbore carb so get the spreadbore intake which will also accept a Holley, which are square bore carbs, without any adapters. If you chose a square bore intake, you'd need an adapter to run your q-jet.
Instructor
Joined: Sep 2005
Posts: 241
Likes: 0
From: St Louis Missouri
I put the RPM with Q-jet on my 75. It is already significantly taller then the stock hood will allow. I will have to modify the hood, or drop the filter. Adding another .75” or more for an adapter may limit your options.
Melting Slicks
Joined: Sep 2004
Posts: 2,412
Likes: 3
The 7104 is actually cheaper, only $80. And the 7101 is almost $150. Take a look. 
http://forums.corvetteforum.com/show....php?t=1352343
And it fit under my hood with a Q-Jet and a Mighty Demon with the Summit drop base air cleaner.
http://forums.corvetteforum.com/show....php?t=1352343
And it fit under my hood with a Q-Jet and a Mighty Demon with the Summit drop base air cleaner.
Melting Slicks
Joined: Apr 2004
Posts: 2,083
Likes: 2
From: Montreal Qc.
Originally Posted by Surfer69
I'm using my Qjet and know that it should use a spreadbore type intake. But the 7104 is more expensive than the sqarebore 7101. So is there a big difference if you use and adaptor on the squarebore for the Qjet? Would I lose hp or CFM? The only thing I can see is an adaptor raises everything and may not fit under stock hood anymore. Anyone check this out?
79 with stock hood
Performer RPM square bore
Q-Jet
3/4" thick cheapie Mr Gasket spread/square adaptor
All this stuff FITS with a drop-base and 14x2 inch filter.
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NCM Grand Opening Veteran
Joined: Sep 2005
Posts: 20,979
Likes: 384
From: South of giving a damn
St. Jude Donor '11, '17
Come on guys. You want a Holley or Demon then run a square bore intake. If you want to run a Q-Jet then get the right intake and quit putzing around. I'd rather run a stock intake than trying to bastardize the whole system. I understand that money may be an issue, but just wait until you have enough saved or find a good used one. This instant gratification just doesn't work.
Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
There would be no significant loss of HP running a Holley on an intake designed for either a spread-bore or square-bore carb. You would lose something by utilizing the ugly adapter needed to run a q-jet on a square-bore intake.
