i have a 305 in my camaro right now. the car was originally a v6 and has solid motor mounts now. if you find my other thread i have a knock in the engine.... well ive found a 403cid for dirt cheap( my dads gf has it in a monty ss) as far as i know the motor needs work, but thats not above my skills. i want to know if its worth the trouble to try the motor in my car? wat considerations need to be made. i have the 700r4 but the 403 has a turbo 400, will this be as easy as drop in and replace or will i be in serious doodoo come time to drop it in???

 

oh yeah i eventually want to take my car to the track so im looking at street/strip.

 

u can put that combo in, but i think you will need a differ driveshaft if you got witht he 400 tranny, maybe a crossmember...

 

different drive shaft, torque arm problems, speedo problems, you name it its there. But, if its a track only car, go for it.

 

well i dont need to worry about the speedo it doesnt work anyways. now can i fit to 403 in with my 700r4 or do i need.. absolutley need teh turbo 400?

 

Youre definately not gonna get that 403 to the 700r4. I know they make adapter plates to put the BOP tranny on the chevy engine, i dont know if it works in reverse, i guess it could. Good luck man.

 

Ain't worth the hassle IMO. H#ll, if I went through all the trauma of figuring out how to put a 403 in a F-body, I'd make it more worth it and just go with a 454 BB Chevy engine.

 

uhh BOP what.... its a gm motor and gm trans..... as far as i know. and the story of why im puting 403 in is simple mah dads GF has it... hasnt used it in the monty she has.... and is selling it to me for $75 U.S. come on thats a deal worth anything imo

 

BOP is Buick Oldmobile and Pontiac. They have completely different trans bolt patterns then a chevy. You can't us a chevy trans on a BOP or wise versa. But they do make adapters for either way. THe 403 can be a good buildup because it has a huge bore and short stroke. Put a stroker crank in it an build a 500+ motor. But the 403 has a weak block so watchout.

Not worth the swap, i wouldn't do it. IMHO

 

ahh .... i thought buick, olds, pontiac were gm but hey i learn new things everyday...... aside from the trans problem would i have and clearance issues to worry about. i read somewhere that larger engines require frame members to be cut and welded( not an option ) and for the floor pan to be pounded. what im asking is will this engine drop into place and mount to the car w/o mods or will i need to take other considerations...

 

that motor will chew up and spit out your 700 even if you put it up behind it

 

is that meaning the 700 can hold the power the 403 will lay down or what??

 

He meant it won't hold up to the power of the 403.

In standard form, I agree. But there are also very stonglt built aftermarket 700R4's available that would handle it.

But if that's a big block, you'll have lots of frame, hood, and suspension changes to get it to fit.

Sorry.

 

arg ill hafto measure it to see if itll fit... the cowl hood should cear almost everything , and i need to put new suspension in my car anyways........ and yes i know the 700r4 does have a lot of aftermarket backing.......im glad im asking these qustions b4 i actually try to fit this motor in my car.... will the th400 the 403 is bolted to be able to withstand the power or is that just a mistake by the previous owner?