2000NavyZ

iTrader: (8)

is that year block okay to use? or would i be better off with a newer one?

99LSS1

iTrader: (12)

The only one to avoid is the 98. You should be fine with the 99

NemeSS

iTrader: (127)

C) none of the above. Invest the $ in a 6.0 block build instead of building the ls1 383. Build a 408 with the stroker rotating assy.

swift700

iTrader: (3)

Why this answer? Are you speaking from personal experience? A little explanation would go a long ways. Sure, the 6.0 blocks allow bigger cubes but for a 383 the LS1 block will work fine.

trans_am7935

iTrader: (15)

what is wrong with the 98 block?

JKearney30

iTrader: (2)

I am also curious about the 98 block, why is that a bad one?

SOMbitch

iTrader: (8)

NemeSS maybe he wants to save 75lbs. over the nose like I did because it is not a dedicated racer???

The 97-98 blocks have a little thinner cylinder sleeve and can only be honed .005 Later blocks can go up to .010

I dont remember exactly when GM made the change but the earlier blocks had a slightly smaller oil galley in the back of the block. Some machine shops who specialize in LS stuff can open it up...

Not enough difference to keep from using one if it had nice bores IMO....

97ss497

iTrader: (24)

I'm having it done at AES to my 99 block as we speak...

NemeSS

iTrader: (127)

The 408 has advantages over the the 383 ls1. 4.03 bore compared to 3.905. The 408 will use up the heads and cam more everything being equal. The weight of the iron block is not a big deal. I rather take the CI. Capacity and larger bore the 6.0 offer. If weight is such a factor, consider a ls2 block for a 402 build. I'm just biased to 6.0 based builds. I built a 375ci out of a lq4 using stock crank,rods and speed pro replacement pistons and rings. Self machined engine and 243 heads. Engine made 493rw thru stock rear and t56. I pulled stock running ls1 and sold to offset cost of 6.0 build