Kingchevy

Alright guys so I bought my 92 rs and the guy that I bought it from said he swapped the 305 to a 350. Having said that it runs like hell I'm thinking it's got the original 305 ecm... Should I go out and buy everything that comes with swithcing over the ecm or should I just convert it over to carbureted? All input is very helpful and appreciated!

sofakingdom

iTrader: (1)

First thing to od is to actually identify the motor.

Get the block casting number. It DOES NOT LIE, unlike... used car sellers.



If in fact it's a 350:

Get right stuff to make it like stock 350 TBI = $50 (MAYBE... probably a lot less)

Hack carb onto it = $$$$??? (how much is a carb, distributor, FPR, plumbing, hacking up something to make the fuel pump and torque converter work right, long-term cost of using more gas, long-term costs of maintenance, ???)

At least give the first one an honest try before sending your car down the other road, which unpleasantly often, turns it into JUNK.

danryanm

Be careful using the casting number on the rear flange, as some numbers have been used for multiple displacements (they will, however, eliminate several possibilities.) The most accurate number to use is on the right cylinder bank just in front of the head. That being said, a machined block may render that number unreadable as it wasn't etched very deeply to begin with. Aaaaaaand if the block has been machined, none of this matters anyway because someone has rebuilt it, and there's no telling what sort of gumbo they've made out of the myriad combinations of SBC parts out there (and I do love me some gumbo.)

But he's right, unless you know what you're doing and you already planned to go carbureted, try the simpler and cheaper route first if you just want it to run.