Ok, I had a chance to pick up a complete 400sbc for cheap that needs a rebuild. My only concern is weather my rebuild 700 w/ 1900 stall will be able to handle the torque? Could I get by with it if I get a big trans cooler and shift kit? Or is it just too much for that trans to handle? I don't have a heavy foot when it comes to this truck, I have a Buick GN for that, so I won't be beating it to death. Just want that torque for the trails. Maybe I should just ditch the 700 and get the TH400 that these engines came with? I'm on a tight budget so I don't want to spend all that much on this swap if I can.
CK5
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400 w/700R4?
- Thread starter RedDevil
- Start date
RedDevil said:
400sbc's came with a TH350 in the Blazers... you might see a 400/400 combo in a 3/4 pickup or Burb, in the late 70's when the 400sbc's were offered.
Anyway, I don't see how a 400sbc is gonna kill a TH700 ... a 454, sure, but unless you build the he!! out of your 400sbc, it's not gonna be THAT much more torque than a 350.
Also depends on how built the 700 is, I imagine ... what do I know, I only have TH350's and 400's =))
-- A
Well my 700 is newly rebuilt w/ the 1900 TC, got the trans from Ebay last year. So its still stock but when I do the engine swap I was going to do the shift kit, cooler and maybe afew other small things but it won't "built". I just don't want to burn it up after afew trail trips. The engine will stay pretty much stock, is has an Edelbrock carb and intake and I'll probably through a cam in it but that will be it I think. According to the block # (3951511), this engine came from a 70-73 B or G body, either 255 or 265HP. So like you said, it shouldn't be all that much more then a good 350. But it will definetely be alot more then my little 305 
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90v1500
Registered Member
A 700r4 stock will handle about 350 hp. but it needs some HD internal parts to handle more... with a stock 400 you should be ok...
