I am going to convert one of my 1991 6 Port Non-Turbo Coupes from F.I. to Carb with a Street Port job thrown in.
I plan on using a Holley 4150 Double Pumper with Manual Choke and Mechanical Secondaries. This car will be used on the Street but also serve as an Autocross car.

Yesterday I called Racing Beat to find out what they use to Modify the 600's that they build. I talked to Mike and he offered no information what-so-ever, I guess thay want you to buy a pig in a poke so to speak. I like to know what I am getting for my money though. It's sort of like going into a car dealership and they tell you it works great and goes fast and after you buy it you find out you have a 4 cyl. in it. I figure if you have a good product your proud of it. If you hide whats in it it isn't that great. However he told me that the 600 CFM is ONLY good for use with a STOCK Non-Turbo engine. He said that an engine that has been Street Ported should in fact be using a 650 CFM Holley or run the risk of running LEAN at times! I sure hope he knows what he is talking about BUT I need a Second Opinion.

I wondered if anyone on here is running a similar setup and could offer some technical advise? It would be greatly appreciated.

I have a second 1991 Coupe also Non-Turbo 6 Port, and was wondering if anyone on this site knows EXACTLY what Racing Beat does to the 4150 600cfm's that they Modify? Has anyone taken one apart, or know someone who has, and checked Exactly what P/N's Racing Beat installed in there?
Such as;
4150 Model #(That they start with.)
Air Bleeds (High Speed, Low Speed)
Boosters (Front, Rear, Annular,Straight leg, Dog leg?)
Power Valve
Squirters
Accelerator Pump Size
These specs would of course be used for my STOCK engine utilizing the Holley 600 cfm carb.

Sorry this post is so long but I wanted to get ALL the QUESTIONS out to you at one time.
Thank you for your kind and generous help in this matter.
Sincerely yours,
Robert

 

I think you'll have more luck in the 1st gen section. 99.9% of us here stick with the far superior EFI....

Moving topic...

 

ive got a holley 4150 series 600 on my gslse (6port) and i just bought a holley straight off the shelf and it works just fine. the only thing i would suggest doing is getting one with center hung floats and getting some jet extensions.

i have no idea about the difference in the racing beat one and stock, except for the price.

 

RB has done extnesive research and testing over the years to mod the Holleys to work with our rotarys. Why should they give that info away, it's a business and it's supposed to make a profit.

There have been a few posts of some of the known mods, but not all of them. If you want to find out, work for it. Not trying to be a butthead, but look at it from thier standpoint.