Vette79C3

Finishing up my Edelbrock Performer RPM Intake Manifold install and wanted to know if there were any adjustments that needed to be made with carb when tuning and re-timing. Like, secondary springs or fuel idle mixture screws. I have a Holly 0-9895. Using AFR 180cc heads, 1.6 roller rockers, headers, dual exhaust, etc. Complete top-end rebuild. Curious what may need to be addressed with this upgrade. Thanks....

MelWff

Holley describes that carburetor as an emissions control compliant carb, strange choice for a highly modified engine? Mixture screws will have to be adjusted but beyond that unless you run a dyno mixture test will have to guess based on performance and plug coloring.

https://www.holley.com/products/fuel...t/parts/0-9895

Vette79C3

Agreed. It is a strange choice of carb. That's next to be upgraded but no funds right now. In all honesty, this carb has performed very well. I suspect I will have to adjust the idle fuel mixture screws as I have increased air flow. Thanks.

terrys6t8roadster

Just a check; make sure when depressing the gas pedal you get WOT. The linkage does bend after time. T

palmbeachvette76

I would be more concerned with a spreadbore carb being mounted on a square bore intake unless you have an adapter which would defeat the purpose to start with and also create hood clearance problems unless a high rise hood is installed. When you can replace the carb I can vouch for the Holley Street avenger series. I run a 770 cfm with great success.

garygnu

make sure the throttle blades are adjusted properly in relation to the idle slot .you mite need to turn the idle screws out a little .

jb78L-82

I am using a Holley 4175 650 spread bore vacuum secondary emission carb on my just rebuilt 355 AFR aluminum head, roller cam, 10.2:1 engine and the only change I made to the carb is upping the size of the primary jets from 59-2 to 63's-carb runs great and pulls hard…probably needs a bigger jet and i am planning to add an adjustable secondary metering block but the 4175 runs surprisingly well. The 4175 "emissions" designation is really just the primary 59-2 emissions jet. Other than that it is a 650 CFM Q jet replacement carb…it was designed originally to be an emissions carb replacement for the 78 L-82 Qjet

7t9l82

with the R.P.M Air gap your more than likely going to in crease the size of your squirter(s) and you probably need to up your jet sizes. i have an quick fuel H.P 750 and it is a beautiful thing. could not recommend anything more highly.

Vette79C3

I have the Edelbrock 7104 Intake Manifold, the Holley 108-118 base gasket, and the Holley 0-9895 carburetor. Am I missing something??? I should be setup for spreadbore.

Vette79C3

Do you have a part # for the 63's primary jets?

MelWff

the part number is 122-63

Vette79C3

Thank you. In the details it says nothing about fitting a 4175 but it's all I see for a 63 size. I'm guessing they are easy to replace?

https://www.holley.com/products/fuel...s/parts/122-63

Vette79C3

Actually, this is now my only real question:

I have the Edelbrock Performer RPM 7104 Intake Manifold, the Holley 108-118 base gasket, and the Holley 0-9895 carburetor. Am I using an incorrect configuration for spreadbore?


http://www.edelbrock.com/automotive/...r-rpm-sb.shtml

https://www.holley.com/products/fuel...t/parts/0-9895

https://www.holley.com/products/Fuel.../parts/108-118

Shark Racer

My emissions compliant carburetor pulled 451 hp / 485 lb-ft torque on the engine dyno... I'm sure if I switched to a Holley double pumper the numbers would easily double, but I'm happy for now.

palmbeachvette76

No, you are okay. I hadn't seen that they offer a spreadbore version of the performer rpm. Used to only be the 7101 but you have a spreadbore so shouldn't be any problem other than dialing in the tune once you get it running and read the plugs.

Good Luck,

Eric

Vette79C3

I thought so, thanks. Some of these responses have me wondering about jet size but it was running great on the Performer Intake. As mentioned previously, I'm thinking all I have to do is adjust the fuel idle mixture screws to dial it in.

larrywalk

You have the right parts. The Performer RPM Q-Jet has a dual bolt pattern; it's a great manifold. With a Quadrajet carb on that manifold and a nice 406 that I built, running 3.08 gears, its best was a 11.599 at 118.90.