GM Performance Parts LSA

When it came time to figure out a powerplant for the OLC2 we knew that the new GM Performance Parts line of LS based engines was the logical choice.  The LS7 in the OneLapCamaro had been a great foundation for the '67 but for the '69 we knew that we needed more power.  The solution was the LSA Engine from GM Performance Parts.

With over 550 HP on tap stock and more than capable of making 700+ with some simple tweaks it was definitely the way to go.  For our purposes it was more than just a simple installation.  We wanted to set the engine back 5+ inches to give us a little bit better weight distribution.  That was about the max we could work with the SpeedTech Subframe and Torque Arm and going back that far required some serious reworking of the firewall.

We started by gutting the stock dash and cleaning up the cowl.

I would be lying if I told you that I knew why the decision was made to completely remove the cowl; unfortunately it was done before I knew it.  Now I tell myself that we're saving some weight while, in reality, I know that it's going to be a monumental PITA in the future.

But at this point it's too late to fuss over bad decisions.  All I can suggest say is "don't try this at home."

The Supercharged GMPP LSA is will be by Tremec's T-56 Magnum - the aftermarket version of the OEM TR-6060.  Rated for 700 ft.lbs. of torque it should be ideal for the OLC2.

A quicktime bellhousing is more compact and lighter than the McLeod piece we used on the OLC.

Locating the LSA back from it "stock" position required making some room in the firewall to get the lay of the land...

Back almost 5" from it's "stock" location the LSA needs some help around the firewall and at the subframe.

As always, there is more than one way to skin a cat.  I would consider this, in hindsight, to be the wrong way.  Too much time, labour, and headache to justify.  Once again... live and learn...

After some discussion the decision was made to remove the old firewall and replace it in it's entirety...

We began by removing the old firewall and started its replacement with a flat sheet of metal...

Getting a flat plane far enough back meant removing the factory "tulips" and cutting in to the structure

To give the new firewall some stability a bit of work was put in with a bead roller...

Before the flat panel was curved to replace the now missing tulips

Our LSA looks right at home with the very tidy firewall...

Repositioning the firewall meant repositioning the fender mounts as well - you can see that we're about 2" further back with the new firewall...

The engine setback also required some new clearances be made for accessories...

With some finish work the new firewall looks like it could have been like that way from the factory

To ensure that the LSA could make every bit of horsepower we went with a custom set of Stainless Works headers from SpeedTech.  With 1 7/8" tube they were only available unassembled...  Ironworks created a jig and welded them up in house...

 We're well on our way now...

Next up - the Roll Cage!