Hans Grüber

iTrader: (2)

From my understanding, the LS3/L92 heads will not work on an LS1 with the 99mm bore and they require at least a 101.6 mm bore (6.0L).

I would like to have the larger 6.2L displacement anyways which has a bore of 103.25 mm.

What is the most economical method to achieve this on an LS1?

(1) Purchase a LS3 or L92 block and swap everything over.

What I don't like about this is that I'm essentially ending up with a new engine anyways with the new block, heads and new intake manifold.

(2) Have the LS1 re-sleeved; correct me if I'm wrong but an LS1 block cannot over bored to 101.6 or 103.25 mm from the stock 99 mm bore.


I'm building a V8 Catera hybrid and plan on spending ~$4500 on an LS1 + T56 drive train including wiring harness.

I anticipate that the LS3 crate engine once available will cost the same or very similar as the current LS2 ~$5200 (is this assumption accurate?).

A used T56 will be ~$1200 and the PCM and wiring harness will be an additional $500-$1000.

So the total will be approximately $7000 simply going with a new LS3.

I’m really not sure what the most economical solution is Any advice will be appreciated.

Steve - Race Eng

iTrader: (1)

The least expensive way would be to purchase an L92 block and covers, timing set, etc. and swap everything over.

I can sleeve your LS1 up to 4.200" bore diameter using Darton MID sleeves but it is not an inexpensive process and would be overkill for what you are looking for.

Steve