L92's on a Big Bore 388
 

I have a Ls2 that has needs one of the sleeves replaced. I am thinking about sending out and having all new sleeves installed and going with a 4.125 bore and stock stroke. Has any one else done this? I think that the larger bore and more cubic inches are going to make the L92 heads work better than being on a 6.0???

I'm also considering L92s instead of Stage 2 CNC'd LS1 heads on my 4.125" block. I'm unsure if stock L92s will perform that much differently than ported LS1 heads.

My 387 all-bore engine will be getting L92's. The guy that owned this 387 shortblock before me had some heavily ported TEA LS1 style heads that put down 473rwhp on a mustang dyno. Should be real interesting to see how the L92's do in comparison. :)

You planning to go with dry sleeves or wet?

Mike

I haven't looked to much into the differences in dry or wet sleeves so I am going to start researching it tonight. I have read that the darton sleeves are the way to go.

Should make for a great rpm motor and VERY responsive ! ! :cheers:

I'm the one who sold the 388 or 387 or whatever it was, I liked it, I had 317's that flowed similar to ported L92's except better on the exaust side and smaller runner. I made that 473 with a smaller cam and an LS6 90mm intake setup. The car moved and loved to rev, the only thing is if you are going to buy a 2600 block and 550 pistons, 500 rods, whats another 1000 for a 4 inch crank? Of course that kind of thinking is what got me into my current predicament.......

Wouldn't it be more to sleeve a block than to just buy an L92 block and bore it? Maybe not. I wouldn't know. :)

I bet you will be able to rev that thing to the moon, with proper valvetrain of course.

Short stroke big bore motors rev quick and make big power in a narrow peak range.
That would be an awesome motor with great top end power, it will have low end power, but it won't have the killer low end torque of a 4" crank.

Steve @ R.E.D. does not like the L92 block for resleeving.

I had an email conversation with Steve @ R.E.D., great guy!

Dry sleeves on an LS2 are much less expensive than wet sleeves on an LS1, and LS6 blocks are not recommended for a resleeve.

R.E.D. provides LS2 dry sleeves in 4.125-4.190", but not bigger than 4.150" for FI or nitrous. I've seen Darton M.I.D. sleeves on ebay selling for $1,400, but for $260 more you could have your LS2 sleeved which includes stress relief work.

I found an LS7 block for $2,366 from gmpartsdirect (list price is $3,250). I'm unsure if an LS7 can be resleeved or bored much. I'm unsure, but I think a dry oil sump system is needed.

If you have an LS2 block, R.E.D. will stress relief the block, install sleeves, and deck the block for $1,670 (top secret info I got from Steve). $120 for stress relief, $800 for sleeves with installation of $750. Sleeves can be replaced in a sleeved block, and bore can go to 4.190".

yeah my l92 block was the first l92 block he resleeved, he got it done perfectly, but he said the sleeves were in the block crooked, especially number 7 cylinder i believe.

Does anyone have any insight on how the l92 heads perform on a 4.125" bore vs the smaller 4.00"

I've heard this MANY times, is the quality starting to improve?..If not it seems like LS2 or LS7 are the way to go