[volkerc]

Originally Posted by blindxeyed

Ok, I recently found on GMgoodwrench.com an alloy engine. No idea on the price, but I wanted to get some opinions before I even bothered with the idea. It's V6, 60 degree block, just like my 3.4. The specs on it are as follows:

"Aluminum Bow Tie V6/60º engine blocks have rough-bored 89mm (3.504") cylinders which can be safely overbored to 91mm (3.582"). Light alloy Bow Tie blocks have bosses for both front-wheel-drive and rear-wheel-drive engine mounts. The starter motor can be installed on either side of the block. The cylinder walls are non-siaesed, and the cylinder deck height is 8.820". Cylinder bore range is 3.525-3.582"; crankshaft journal diameter is 2.65"; all sump type is wet. This block has a 2-piece crankshaft seal and a design maximum stroke of 3.20". Intended for professional competition."

Summed up:
Bore:89mm, can be safely bored to 91mm (3.525"-3.582")
Max Stroke: 3.20"
Total ci: 185ci (3.05L)
Total ci (bored to 91mm): 193.4ci (3.18L)

Now, my 3.4L specs:
Bore: 92mm (or 3.62")
Stroke: 3.31"
Total ci: 204.3 (3.37L)

So, if I were to go with this new alloy block, I would be shedding 47lbs.. And if I were to have the block bored out to it's maximum 91mm, I would still be losing 10.9ci (.19L). Now, as most of you know, I'm really gung ho on doing this 3.4L project. So, what I ask now, is do you think that going with a smaller block and losing 10.9ci is a smart idea? Again, I would have an overall benefit from having a 59lb alloy block. But, I hate the thought of having a smaller bored out 3.2L. Opinions? What would you do?

you won't even notice a performance difference. besides i'm sure you will compensate with a different cam.