At least he'* doing this the right way....

He has an HD trans already, now he'* taking a higher compression block and */Cing it.

That'* the way to go, vs everyone with a regular trans and a N/A motor....I'll possibly be in that boat this winter....

As for the boost levels, I can't imagine that with the stock pulley, that you'd be running any higher boost than maybe what a 2.5 pulley would put into the L67 motor....Possibly even less boost than that...

L27'* and L67'* have the same CR, so there will not be any noticeable difference in power levels in that respect (though with the lower miles engine, it *might* have higher compression compared to what was in the SSEi). As far as boost levels are concerned, yes the levels should be the same, but an L27 may not like the same levels an L67 can do and may be more prone to KR. I am fully aware that this may happen, and if it does, going to a gen 3 M62 pulley should bump me down a few psi, should I need to do that.

So far, this is what is going to find its way into the L27 (aside from the normal L67 components), and all of these are new: lifters, oil pump, knock sensor, gaskets, plugs, wires, water pump, fuel filter. Fuel pump will be fully tested when the engine is in running shape, and that will be replaced if pressure is even slightly below spec. All of this will help ensure this motor will survive in its new environment...hopefully

The compression ratios are still different. The N/A'd motor has a higher compression ratio than the */C'd does.....Higher compression with the addition of an */C equals out to higher boost than what an L67 would have with the same */C and pulley?

The L27 had a 8.5-1 compression as did the series 1 L67. The benefit he would have is a lighter rotating mass of the lighter parts.

Sandrock are you going to contact Gm tuners to make the adjustments to the PCM?

I would only need to make PCM adjustments if I want more fuel, timing, etc. As far as the computer is concerned, it will still see an L67...all the sensors are the same, cubic inches are the same. And remember, I am not looking for performance out of this...just a good running substitute.

right on Brad, the PCM will not care what block is in the car and will be setup just like a L67

Don and I were talking about this too...I would almost bet an S2 L67 can be run on an S1 L67 PCM...so long as all the sensors are in place and functioning...it may not run to the best of it'* capabilities, but I imagine it could be done....

Ok, now for all of y'all interested in how all this is shaping up...

Here is what we started with...93 L27 with about 92k on the ticker...sure looks grimey!

Now let'* pop off the top and see what'* inside....

Hmmm....very VERY clean in there...

Nearly bare...

Don and I scratching our heads on something...

Freshly painted manifold with new sensors.


Take a look at the carnage all over the pad...

Supercharger goin on....

Now with damn near everything needed


Next steps are to put on coated front exhaust manifold, new oil pan, L67 balancer, a/c bracket, and...??

Looks like ya makin some serious progress there

Can't wait for final assebbly and the first test run

That was one clean lifter valley.

I didn't think 93 had a heated O2 sensor.