93M6Formula

Hey I have a question about LT1 heads.
Is there any of the aluminum heads that are a better casting or anything like that? or are they all the similar?

Thanks
Aaron

Gojira94

iTrader: (4)

Lots of info on this out there- the 10128374 and 10207643 are the ones AI will port for you. the 561 castings are ok for porting, but flow best as-cast vs the older 2 castings from 93-95. If you want the best as they popped out from the factory, try the 561s. If you want porting from mild to max effort, go with the older 2 castings or go aftermarket if you prefer.

93M6Formula

Okay good to know, I have the 374's on my car now and was just curious.

nitrous2fast

iTrader: (2)

which casting came on the 97's?

ZGOBYBY

iTrader: (14)

I believe 374s came in 97's.

Gojira94

iTrader: (4)

96-97 were mostly the 561s. 374 was a 93-94 casting, IIRC.

93M6Formula

Sounds right cause my '93 has 374's.

Gojira94

iTrader: (4)

I have a pair of 374s and a pair of 643s ready to go to AI. Tax refund is for ***** this year so it'll have to wait until summer, since I also need a $680.00 stall, $300.00 for rear gears & installation kit, $240.00 rockers, $300.00 cam to make it all work.

93M6Formula

I hear ya, I kept thinking all winter I was gonna go ahead and get my heads done and buy a cam. Then I remembered all the little pieces that have to go with it, tune, rockers, poly locks, guide plates, gaskets, injectors, you know the rest.

Suddenly it wasn't so cheap anymore

wrd1972

iTrader: (12)

ZGOBYBY

iTrader: (14)

Oh, okay. Thanks for the correction. I know I had 643s on my '95.