Technical > Matt Shaff's Engine Shop

Flexplate and torque converter

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bikeguy307:
Any good SFI flex plate will be satisfactory, making sure you go with the proper balance for your motor. As far as stall speed goes, the rule of thumb is 1000 to 1500 rpms under your shift point. The heavier your car the lower your stall. If your 3000lbs you will want to be around the 1500 rpm below your shift, if your 2000lbs you could be around 1200 rpm below shift

gasserx:
Wild guess, but i think the car with me in it will be around 1700 lbs.
Trans is a shorty PG. Engine SBC with hilborn on alky. 4.10 gear, 33" tires. I`ve been told an 8" 4500 should be good.
Can someone tell me how i choose the correct/matching flexplate and converter brand/partsnumbers...there is so much to choose from  :-[
I think i just have to start somewhere and work my way from there. First year will be "test-n-tune".
 

hemidakota:
I have had great luck with continental torque convertors. We just changed out a custom built spec rite convertor for a custom built continental and the FED picked up .3 in ET and .1 in 60'. Both convertors were built for the FED. It is a 560ci BBC. Convertor stalls to 6000 now and we shift it at 7500. I agree with duster Dave on looser is better to some degree, wheel speed is a good thing.
http://www.ctconverters.com/
Cheaper is not better in the convertor world.

dusterdave173:
 Yor going to pay over $800 for a new unit--Buy a used 8 inch from a trusted source for $350 range and go with it for a while--any chevy SFI flexplate for internal--I am guessing your engine is internal balanced  163?? or whatever tooth not the 157 job--they are never more tha $69 here new--NO need to get a $250 "Wheel" from JW or a billet from CSR forget all that--Jegs / Summit etc never more than $70 for a quality SFI plate--they are all made in the same place no matter the brand--all overseas units rebranded and same unit sold from $59 to $119 SAME flexplate different name
For getting started just about any 8 inch will do fine--get some ARP converter bolts about $25  leave the washers off to help make up for motor plate spaced pads and keep rolling--your car will run within 3-4 tenths with the best converter and the wrongest 8 inch you can find--it will work--don't worry
We get good used 8 inch units all the time and use in our cars--it is great to have a custom built converter but to get started you don't need one yet--not until you can give the converter builder GOOD information--order one now? You will be guessing at so many things he needs to know--run a used 8 inch--then send it in and say--here is what is happening which way do we go?
Stay in touch and we will find you one that will work Keep that $$$ in your blue jeans

George:
I have a Contential convertor we ran behind our 355 injected motor. Stalled 6200 with our deal. PG spline. Excellent condition.

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