turbo 400 question

[randy1]

im putting a turbo 400 in my my blazer and ive an sm465 right now and i dont have a flex plate yet and just wondering if the interchangle between differnt autos trannys as long as there for a 350 and also wondering is there the same for a 454 as a 350 becasue i plan on swapping a 454 in fairly soon thanks for your help

 

[sweetk30]

400 sbc and 454 bbc use external balenced flywheels/flex plates. so no as to 350 now then 454 later. but yes as long as old 2 peice rear seal then any internal balenced flex plate will work as long as it is the small for small starter and big for big starter.