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C3forME
06-10-03, 10:38 PM
Does anyone know if the Edelbrock Performer 2101 Manifold will fit under the stock hood of my 77. I have an L-48 with a stock Q-Jet carb, a GM Chrome 14"x3" open air cleaner, and no emissions or EGR. If it will fit that's great, but how about if I decide to go with a different carburetor such as the Edelbrock or Holley? Also what would be the right CFM carb. to run with this engine and intake manifold combo if I do decide to change the carb., the engine has Hedmann ZZ4 headers on it as well if that makes a difference.

Jack
06-12-03, 07:56 AM
2101 will fit under your 77's hood with Qjet & stock air cleaner ... dunno about your air cleaner ... probably will fit as well. Keep your stock Qjet ... it's a really great carb and it flows about 750 cfm ... that's all you'll ever need.

Take a look at this thread ... http://corvetteactioncenter.com/forums/showthread.php?s=&threadid=30039 ... dunno if another intake is gonna make much difference. But recurving your distributor's ignition curve will ... cheap, quick & easy. With headers, I'm guessing you also have true dual exhaust ... if not, that'd be one of the first things to after recurve.

As with any performance mod ... the potential for emissions-testing failure exists ... may or may not be an issue in your jurisdiction. Not an issue here in SC ... yet.

Recurve dist first ... next true duals (if not already) ... next upgrade cam ... next upgrade intake if it'll make a real difference w/ YOUR combo (do the intake along w/ cam-no need to pull intake twice).
JACK:gap

Ganey
06-14-03, 08:48 AM
Yes. If you change carbs, all you need is 600 CFM.

Stallion
06-14-03, 09:19 AM
Originally posted by Ganey
Yes. If you change carbs, all you need is 600 CFM.

Wouldn't you want a more high-flowing carb with 750 CFM or something? Isn't that better and maybe more power?

MaineShark
06-14-03, 12:33 PM
Too much airflow will hurt driveability, on the street.

A carb really only meters fuel correctly at idle and wide-open-throttle. Well, some add another point, but not many.

In any case, in-between those points, the fuel metering is not very accurate.

The more airflow the carb is set up for, the less accurate that metering will be, for an engine that doesn't need that much air.

Some carbs, like the Q-Jet, use an air door rather than butterflies in the secondary side. This allows them to have higher flow, without giving up as much driveability. Your Q-Jet can flow well over 750CFM, but remain as driveable as a much smaller traditional carb.

That's why I like the Q-Jet :)

Joe

iron cross
06-14-03, 01:05 PM
If you had a high compression engine with a solid lifter cam, then a 750 could be appropriate, otherwise opt for a lower cfm carb and not over carb the engine.
Originally posted by Stallion
Wouldn't you want a more high-flowing carb with 750 CFM or something? Isn't that better and maybe more power?

Stallion
06-14-03, 01:15 PM
Okay, I see. Thanks guys!! :)

TR

resto75
06-14-03, 06:46 PM
I was wondering about the CFM issue myself and just finished removing my Holley 750 vac sec and replacing it with a 600 CFM Edelbrock performer. I think this was a good change as I was having idleing problems with the Holley and maybe it just needed a rebuild but I decided to change to the 600. I do think I lost some on the top end as my engine is not stock but it seems to run better the rest of the time with the 600. I can always rebuild the 750 if I want and put it back on.