Last weekend I purchased an engine for a conversion project. It was supposed to have been from a 98 Trans Am. Here is what I can find as far as numbers: block 12550592, heads 243, pcm 16238212.

From my research I think I have:
1998 5.7 ls1 block
1998 pcm
I thought that 98 ls1 engines came with 241 heads so I am unsure.

Can anyone either verify my findings or correct me so I can have the pcm flashed correctly.

Thanks in advance for any help.

 

it seems like you got your hands on a LS1 block with LS6 heads

 

LS1 BLOCK, LS6 HEADS FOR CERTAIN. SCORE IF THE PrICE WAS RIGHT

 

98 engines had 806 heads.

 

Paid 1800 for engine, 4l60e, harness and pcm, fuel tank, radiator, drive shaft, air box and assorted parts. 95k miles.

How did I do?

 

If the engine runs and all the parts are good you made out like a bandit.

 

for sure you made off with a great deal, mine is 98 block wth 853 heads (which i didnt use)and i paid 1500. it had everything except for the pcm and trans.

 

Well sooner or later the sun shines on us all. This will help to make up for some the not so great deals I have made in the past. LOL