im wondering if some body can guide me in the right direction i have a 383 stroker i built with a edelbrock tri-power intake made for the rochester carbs.I have three new rochesters for it i need info on modifying these carbs for this use...do i leave the center carb stock just remover the chock? and the two end carbs fill the idle circuits with jb weld eliminate the chock as well ...what about the floats? well thanks for looking ppl
Check out these guys in Florida. They did a tripower setup for me and it worked great. http://www.parts123.com/parts123/yb.dll?userwatch~dynamicSearchPage~cadegdha
You'll get mixed reviews on Charlie Price - do a search for his name. ***uming you'll run progressive linkage, you'll want to leave the center carb pretty much alone - this will be the primary carb. Your secondary carbs should have the idle circuits plugged (couple ways to do that - not sure JB Weld would be first choice), chokes removed, and you'll really need to get thicker, beveled throttle plates so they close off completely.
Speedway sells a kit to modify 2 of the Rochesters so they work correctly in a tri power setup. Not cheap though, about $400 for the kit. No carbs included. They just showed this on one of the Spike car "build" show, HorsePower or Trucks last week or so. if my poor memory is correct.
Pgs.102 -111 hp books popular hotroddings small block chevy performance trends ,should have it at your barnes&noble or local book store, it will walk you through it .
I'm doing this as we speak. I just came in for lunch. It's a little more involved than you might think. I've only had good dealings with Vintage speed. I called to order the parts to modify my carbs and bases. Naturally he wanted to sell me his bases but when he realized that I knew a little bit about it he volunteered lots of knowledge to help me do it myself including lapping in the secondary ****erflies. Some guys want to protect their turf and aren't forthcoming with their speed secrets. He didn't seem to mind that I was not spending as much as his user friendly kits would cost. He recommended jet sizes for primary and secondary carbs. If you are not scared of carbs it's very doable with the right information. The kits take the guesswork out of it but dammit I enjoy doing it myself not to mention I can use the savings for some bling on the engine. I ordered everything..extended shafts, special secondary ****erflies, power valve plugs, jets and modified power valve piston for the primary. I got it all in less than a week. I'm really enjoying this.
Well, now I got to hijack this thread, sorry Rats***. Tommy, you always got something interesting going on Can you share the process on lapping the plates to the bores? I think this could be applicable to the primary carb also, or even to any carb that you need to optimize. If you can get the plate to fit the bore real nice, there;d be a better chance of getting the low speed airflow consistant and right when tying to transition from idle to high speed. I think this would help the flow at the transition. Thanks, Frank
First let me say that this is my first attempt at this. There are many more qualified but you asked so here is how I did it. You can see the difference in the thickness between the new secondary ****erflies on the left and the original Rochester ****erflies on the right. He makes them over sized on purpose so that they can be lapped in to get a good seal preventing the vacuum leaks. A carb return spring is connected to a C clamp on the vise. The orange **** is chrome polish. I didn't have any valve lapping compound and Charlie said this would work...it did. I simply opened the throttle. Then let it slip so the spring snapped the throttle closed with a lot of force. Basically just snapping the throttle repe***ively. It took a while but I was only doing 2 of them. I had to keep the compound on the high edge while it wore down. I'm sure the pros have a better way. eventually the black line will go all the way around indicating that the ****erfly is seating properly everywhere. You won't need to do this on the primary carb. The carb bases that come in the kits have this already done. I hope mine work as well as they do. I won't know for a while. I don't even have the engine in the car yet.
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