can I bore a gen 1 cast iron block out to 92mm

[cortezit]

I have a 1987 S10 extended cab 4x4, 5 speed, with a "lunched" 2.8 I want to put a "modified" engine in it. What I would like to do is stay with the 60 degree V6 but raise the "cubes" to the 3.4 engine. I have an engine builder who is doing my work. The engine is to have gen 2 aluminum heads, ported and polished, with a matching TBI intake bored to match a 4.3 TBI. We are going to put a "roller" in it. This man is truly a professional with multiple engine buliding success's under his belt. How far can we safley bore the block. We are going to use custom pistons and shoot for 11:1. We will be giving the flow numbers, swept volume, etc to tbichips.com so that he can burn a preliminary prom. We will then use win adl program to "tweek the cpu" .

Shooting for 200+ hp and 220 lbft torque.

Cortezit

[60dgrzbelow0]

Take a few minutes to review this chart (from top to bottom) for the physical differences that the block evolved through over time for your answer...

http://60degreev6.com/content/60%C2%BAV6_Family_Tree

[cortezit]

Thanks

After the posting I continued to read through the volumes of information on this site. It is then that I noticed the side note on the Gen 3 Camaro block.
I mistook the quote that all 60 degree blocks were the same, which may be true as to bore and stroke, the rub lies in the internal casting changes which would permit a .120 overbore without going through the cylinder walls or developing some serious "thin walls" and therm shed problems.

I guess that I will "run what I brung" but with a 3.1 crank and a .020 overbore and see what we get. Horse power is directly proportinate to the amount of money you invest. I am in my late 60's and just like to "mess around" with stuff I find in the salvage yard. I guess they call that "old guy stuff".

Thanks again for your reply.

cortezit

[60dgrzbelow0]

You are welcome... ... from one "Old Guy" to another... the important thing to remember is that one does not get to be an "Old Guy"...by being a fool.

[Superdave]

I'm sorry but you won't get to 200 HP on that setup, also there are no TBI intakes that will fit those heads.

the gen2 heads aren't much better than the old Iron heads when it comes to flow, gen3 heads are where it's at.


In your situation i'd pick up a running 3.4 from a Camaro, remove the top end and turn it in for scrap. Look around in the yards for a '04-'06 3500 (3.5 LX9) and use that top end on the 3.4. Cam options are getting slimmer for the flat tappet blocks but a Comp 260 would be plenty.

You would have to run it as a MPFI engine, an engine harness from a early 90's Cavalier and the computer would be the easiest route. Injectors from a 3.4 DOHC would be enough. You may have to change your fuel pump but that's easy in those trucks.

As for tuning, that's the fun part. No real difference, just use Tunerpro RT(free). You could start off with 3.4 DOHC code and just reduce the WOT spark advance down to about 28 degrees and tweak the VE tables.

Everything can be found in a salvage yard.

Not an old guy (but i feel like it most of the time).


*edit, 200+ HP and 220+ TQ won't be a problem with a 3.4/3500 hybrid. With a good tune and maybe some headers 250 HP (crank) would be my guess.