Juanquezadalt1

who has put a caprice 5.7L motor all cast iron on a firebird? what was it like is there any difference? will my headers bolt on to these heads? what is the easiest way to swap motors right now the one in my car is just a block

hokeplaya05

iTrader: (3)

the only difference that i know of it the accessories on the front of the motor are pushed out about an inch compared to the f-body front accessories. the crank snout would need to be changed to an f-body one to get the accessory pulleys to line up correctly. i believe the caprice/impalla motors had iron heads on them as well compared to aluminum heads on the f-bodies, but the headers should still bolt right up.

my car came with a motor out of a 95 impalla ss (previous owner swapped it in) with f-body heads and front accessories on it. when i first got the car i sheaded two belts before i figured out that the crank pulley was about an inch forward of the rest of the accessories.

Juanquezadalt1

thanks for the reply so what will i do about the accessory pullies? i got a bit lost on that one

NewOrleansLT1

While your motor is out swap the heads over and accessories.. Cam swap and springs would be a good idea also..

93M6Formula

Pretty sure this was all answered in your other thread...

The motor will drop in, bolt up, and run exactly like your old motor.

Just put your F-body accessories on it and go. Just make sure you're not buying an L99, which is the smaller 4.3L "LT1".

Juanquezadalt1

Thanks guys how much nitrous do you guys think I can shoot thru this cast iron tank

bufmatmuslepants

iTrader: (3)

The cast pistons are your weak link with nitrous, 150 is max rule of thumb on stock cast pistons, iron or aluminum heads doesn't matter.

96capricemgr

iTrader: (1)

Just because this guy is thick and desperate to find some issue with B-body parts it warrants repeating those pistons are the same as the f-body and Vette.

The sparkplug angle is different on the iron heads but may be fine ,mock up your headers on he stand.

transbird95

iTrader: (4)

I did it many years ago i didnt have any big issues at all. I did not notice a performance dfference either. All my car had at the time was a catback exhaust.

Juanquezadalt1

thanks guys i might start in a week or two when i find time for the swap and ill take my LT1 block to a machine shop to get the bolt out

Dirty_Bird

Waterpump is,also different i believr