phluxx

Looking at building up an LS1 and am just curious about the differences between years for example: 98-99 had the 806 heads which were shittier compared to the newer 853/241s is there any other differences in the blocks or any part of the motor that is important to know?

I am looking at a wrecked 99 Firebird for its motor and trans locally and dont want to buy the wrong gen LS1

any help is much appreciated thanks in advance.

Decadence75

iTrader: (17)

From the stickies

https://ls1tech.com/forums/1740880-post2.html

RPM WS6

iTrader: (3)

Only '98s had the 806 heads, '99-'00 had 853s and '01+ had 241s.

Understand that there is nothing "shitty" about the 806 heads vs. 853. They are exactly the same other than the perimeter bolt valve covers and individual coil packs vs. center bolt valve covers and coil rails. Internally, neither is superior to the other.

Only the 241s were *marginally* superior in stock form, due to the improved casting process. But this is a small thing, and is negated once the heads have been ported. All LS1 heads (806/853/241) have the same potential once worked.

Either way, the '99 engine would have come with 853s stock.

The sticky linked above gives futher details on this.