Eddelbrock Performer RPM - Advise & Comments?

[fine69]

My engine is finally in the final stage of this rebuild.

I'm installing the "Eddelbrock Performer RPM" package - as hopefully, the final part of the actual rebuild.

The Edelbrock package consists of:

Edelbrock Performer RPM intake manifold #7101
Edelbrock Performer RPM aluminum heads #60899
Edelbrock Performer PM Cam and Lifter Kit #7102 (Lift .488/.510)
Edelbrock Performer 600cfm carburetor #1406

Will this setup fit under a 1969 hood using a the LT-1/big block hood?

I going off to have some surgery done next Wedesday and will be incapacitated for a while... I may not be getting her on the road this summer

 

[kiwi vet]

Hey Fine69

Sounds like your on the right track, the only question I have is the carb, is this big enough? :confused
Edelbrock site starts @ 750cfm as recomended size carb for this spec manifold.

Best thing would be to email your engine/drivetrain specs, eg. compression, ignition, gearing, and finally how you propose to use the vette (really use it). Let the Edelbrock Technicians spec thier parts, that way you take avantage of thier knowledge of thier products, and as you have installed a recomended system, you should get better support if needed.

Just my $0.02 worth

Good Luck!

 

[vmrod]

I agree. Typically to make a quick calculation of the required CFM required, you take your cubic inches and multiply times 2. 350x2=700. (or was it 1.8?) At any rate, it is higher than 600. If you are going with a bigger cam, better heads, better intake, then your engine will be breathing much,much better. I think it would benefit with the 750 carb. However, talking to a pro would still be advisable.

Lastly, don't forget your exhaust system. I don't know what you have, but the better the engine can breath, the more you need a good system to get rid of all the waste gasses.

 

[fine69]

Kiwi Vette and vmrod,

Thanks for the replies. That's intersting - I thouhgt I read somewhere in here that the 750 was too much carb. Anyhow, I'll take your advice and contact tech support at Edelbrock. Those folks are helpful and made the recommendation for the aluminum heads.

I did find a pdf on their site that looks also helpful (I'll check it out 2nite) - it's at: http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_app_chart.pdf

About my exhaust system - the only thing I have are new headers (Dynomax ceramic coated)... the pipes and mufflers are stock. One day I hope to get the chambered system from Mid America.... do you think that setup may be TOO LOUD?


Thanks.

 

[kdlp]

I stopped at the Edelbrock Factory display at the Puyallup (south of Seattle) Car Show 2 weeks ago and discussed with the rep this exact subject (carb size).

I am doing a frame-off on an '81 and have almost exactly the engine package you described. In discussing this with the rep, he recommended the #1406/600 cfm carb. He says he had manned Edelbrock's tech line and many, many times he finds that peoples carb problems are because they are over-carbed.

I was arguing whether or not to put the old Q-Jet back on or put on a 750cfm Edelbrock and by the time I left the display I was thinking the 600 cfm would be enough. I don't intend on racing... drag or otherwise... I just want a solid "no muss, no fuss, put my foot down and it goes" response. This guy has me convinced that 600cfm is enough....

kdlp

 

[kiwi vet]

Interesting?

Attached link for info I passed on, maybe they dont agree with thier own site?

http://www.edelbrock.com/automotive/

Go to RPM and your part number, lowest flow carb recomended, is 750cfm?.

Still, it would best to go with whatever they recomend after you email all details on engine through to them (incl exhaust), then if not happy you have some comeback.

Good Luck!

 

[L48]

Ahh! Assuming this is a 350 or larger, a 600 CFM is too small for that combination IMO.

If you have problems with the 750 it is because the accelerator pump circuit needs adjusted. I don't know how that is done on a Edelbrock carb. I know it is easy on the 750 mechanical secondary Holley I have. I run it on a 350 with a single pattern .480 lift cam with stock valve 882 casting heads.

Check out the specs on the stock Quadrajet. I am sure it flows more than 600 CFM. Think about how much improvement the parts you are installing will have on airflow.

Maybe the stall converter (are you running an automatic) is a concern.

 

[kiwi vet]

L48, your comment sparked a re-collection about being suprised at reading John Lingenfelters comments about the humble Q - Jet in a book I have.

Checked my book, and L48 your right, quote:" As a plus, few realize that the Chevy Q-Jets are rated at 750cfm" Page 118 Title Induction/Carburetors/Q-Jets.

Lingenfelter is a guru of the SBC :BOW and he should know!.

Fine69, theres your answer, 750cfm is the way to go!!!!!!!!!!!

Good Luck

 

[goingballistic]

I'm coming down the home stretch of my rebuild. After several discussions with Edelbrock, I am convinced a 750 CFM is the way to go.

The intake I chose is the Edelbrock RPM Air Gap and Edelbrock said.....750. I was also told it "won't fit under the stock hood"..........guys on the board suggested a drop base air cleaner and that's what I did. The motor goes to the dyno in mid August, so I won't know for sure about the fit till the end of August when the motor actually goes in the car.

 

[fine69]

Hey Guys... thanks for the replies. I received a message from Edelbrock.

I gave them my specs and since I have standard 9.5:1 compression, they recommend at least 650 cfm. If I stick with the "Performer" series carburetor, the 750 cfm is recommended. They also have a product line called "Thunder AVS"... in that series, i can go with 650 cfm.

I have a 4 speed Muncie transmission, so I don't have to deal with the stall coverter stuff.

In any case, I have to upgrade my Edelbrock 600 cfm Performer carb to something more beefy.

Thanks again!

 

[fine69]

I'm coming down the home stretch of my rebuild. After several discussions with Edelbrock, I am convinced a 750 CFM is the way to go.

The intake I chose is the Edelbrock RPM Air Gap and Edelbrock said.....750. I was also told it "won't fit under the stock hood"..........guys on the board suggested a drop base air cleaner and that's what I did. The motor goes to the dyno in mid August, so I won't know for sure about the fit till the end of August when the motor actually goes in the car.

Awesome! I was checking out that Performer RPM Air Gap too, and didn't go for it because of potential hood clearance probs.

Let us know how it works out!

 

[kiwi vet]

Hey Fine69

Just remember
"To much of a good thing...................... is probably just enough"
Good Luck!

 

[SMR 67]

Awesome! I was checking out that Performer RPM Air Gap too, and didn't go for it because of potential hood clearance probs.

Let us know how it works out!

I'm researching this same issue with the Edelbrock Performer intake manifold for a friend of mine with a 69 that he's also rebuilding. It's a big block car (427) and he's putting an Edelbrock 780 carb on it. His concern is the same - that the Edelbrock Performer manifold that he wants to get won't fit under his stock 69 big block hood. He doesn't want to go with an L-88 hood. Have you solved this issue for your rebuild? What is this drop base air cleaner - simply shorter in width than the standard one - and will it solve the problem?

Thanks

 

[cptkirk32]

Remember, you don't want to over carb! Many people will over carb their engines, with our "controlled fuel leaks" i.e. carbs, you'll want to pick whats best for your set up.

SGT Kirk

 

[glen242]

I'm researching this same issue with the Edelbrock Performer intake manifold for a friend of mine with a 69 that he's also rebuilding. It's a big block car (427) and he's putting an Edelbrock 780 carb on it. His concern is the same - that the Edelbrock Performer manifold that he wants to get won't fit under his stock 69 big block hood. He doesn't want to go with an L-88 hood. Have you solved this issue for your rebuild? What is this drop base air cleaner - simply shorter in width than the standard one - and will it solve the problem?

Thanks

Performer fit, with room to spare, using stock air cleaner. When I went to the RPM I had to use a 7/8" drop base w/open element. Stock air cleaner would not fit, even with the drop base.

This was on my '76, and I understand earlier models - maybe prior to '73, have even less clearance.