LS1-SEVEN

iTrader: (1)

Like the title says, what are the differences between the roadmaster and f-body lt1 engine? Because I have a roadmaster lt1 that I am rebuilding and I will be dropping into a RX7. I need to make sure all lt1 parts are innerchangerable.

thanks

NotACop97Z

iTrader: (7)

Look up the LT1 FAQ. there is alot of good info in there for you. There are some differances but most parts will bolt up.

96capricemgr

iTrader: (1)

Might help you to know year for year the Roady, Caprice, Impala, Fleetwood are all the same as eachother and the bottomends are the same as the f-body.

LS1-SEVEN

iTrader: (1)

cool I will look in the FAQ. Will the f-body wiring harness and ecu plug into the roadmaster engine.

my94blackz

Main difference is heads. I think the rest is univeral. The exaust prolly isnt the same, wiring harness prolly is not

LS1-SEVEN

iTrader: (1)

Its a 94

LS1-SEVEN

iTrader: (1)

I know the heads are different. I want to swap to aluminum heads.

BlackBirdWs6Zzz

iTrader: (6)

I think you should stick with those heads. just have them ported! They can take ALOT more heat then the aluminum!

LS1-SEVEN

iTrader: (1)

I wanted to swap to aluminum heads because of the weight. What about aftermarket heads?

BlackBirdWs6Zzz

iTrader: (6)

the weight ain't THAT much difference. You could take your heads and send them off to loyd elliot to get ported with a matching cam. You would make alot of power with those!

96capricemgr

iTrader: (1)

stock for stock neither head is worth swapping to from the other, the irons flow a little more than most of the aluminums, only the best aluminums matching them as cast. For porting though the early lesser flowing aluminums offer the most potential.

There is not a single aftermarket head I would recommend for a stock shortblock porting one of the LT1 castings can work great, for max effort you just want the early aluminums.

The wiring will work.

LS1-SEVEN

iTrader: (1)

Do you know how much of a difference? I was thinking 50 pounds.

96capricemgr

iTrader: (1)

it is a little under 50lbs more like 47lbs., not saying you were wrong more just verifying you were in the ballpark.