holley 4160 jet size for a 12a
02-11-03, 01:43 AM
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holley 4160 jet size for a 12a
I just purchased a used holley 4160, 600 cfm. I know it is large for my motor although I did get it for a good price. I was wondering if any one out there would know what jettings to use for a stock port 12a with a racing beat intake manifold and headers? thanks for any suggestions
02-11-03, 08:50 AM
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Originally posted by Hyper4mance2k
don't forget if the carb hasn't been modified to work on a rotary then you'll need a open spacer between the carb and manifold
don't forget if the carb hasn't been modified to work on a rotary then you'll need a open spacer between the carb and manifold
I think I know the answer, I just want to compare notes here.
*shines spot light at you*
-Error
02-11-03, 04:01 PM
#5
damn i can't find the post i started about it, but it has to do with the fact that there has to be vaccume on both the primaries and secondaries for the carb to run right if you look at the stoc manifold there are little slits between the primaries and secondaries 
and when rb makes the kit they modify the carb not the intke manifold so there is the need for the spacer like so
on the stock carb you can see the link clearly on the front rotar on the rear rotar its located below the butterfly
and when rb makes the kit they modify the carb not the intke manifold so there is the need for the spacer like so
on the stock carb you can see the link clearly on the front rotar on the rear rotar its located below the butterfly
Last edited by Hyper4mance2k; 02-11-03 at 04:05 PM.
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02-11-03, 04:41 PM
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Hyper4mance2k, I just realized that pic you posted is my intake on my '83 before I installed the RB intake. 
http://3rdhour.com/gallery/album03/originalIntake
d'oh
-Error
http://3rdhour.com/gallery/album03/originalIntake
d'oh
-Error
11-03-03, 05:20 PM
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Nikki-Modder Rex-Rodder
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I don't know as much as Carl does about the open plenum design and when it's good - when it's not, ect. But I do know that if you utilize an open plenum you'll change the signal strength to the main jets and the air bleeds will HAVE to be recalibrated to match the fuel jet selection.
11-03-03, 06:33 PM
#15
Airflow is my life
Thats basically it Sterling. 813, were you using this on a RB holley? or a stock Holley. Actually that is a big plenum. I'd try a split, dual plenum spacer. Even on a V8, an open plenum spacer moves torque up the power band which kills the low end.
11-04-03, 07:46 AM
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Not a RB Holley. That is weird Carl, because my top end is what suffered? I truly dont mind a **** low end if the pow is where it is supposed to be! Somebody in another thread asked me if I changed my accelerator pump, which I didnt. Do you think that may make changes in the performance of the carb? The problem I experienced was when I would hit the gas to fully open the carb, the engine would bog and want to die. If I would slowly open the carb to full throttle it would open up but felt weak in the higher rpms ? Actually the low end felt ok. Iam not a big low end power kind of guy, so I really dont concentrate on the low. I like 5 and above that wants to shove the seat in your back! Which I am still chasing, but had with a damn stock carb on a 4 port/street port 13b!
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