smokey1995

is there really a difference in these heads casting # 10128374 and 10125374
they both are aluminum and for an lt1 i hav the 10125374 to go on my 95 trans am (350) but was told i need the 10128374. could someone please tell me whats the difference and will they work. they said something bout reverse flow cooling i also need some roller rockers for the 10125374 if they work but need to know what kind of car they came off of. won the heads of ebay

stryker1320

iTrader: (3)

Are those casting numbers or part numbers? There is a difference.

djjab57

iTrader: (17)

there is 3 casting #'s or three different heads, all will work but 2 of 3 three are a little thicker and are better for porting

96capricemgr

iTrader: (1)

Seeing as it is just one digit different and a 5 and 8 are pretty similar I wonder if the casting is just a little crappy and you are missreading it????


I know on one set of heads I mistook a 3 for an 8 because the casting was funky.

stryker1320

iTrader: (3)

The reason why i ask is because the OP said he got these heads off of ebay. The 10125374 was a GM part number for an aluminum Corvette GenI SBC head, if I'm not mistaken.......