1988 Monte Carlo SS
LS1/T56 Change-over page
September 2002 Project Updates
The installation process went fairly smooth. I had to buy new "torque to yield" head bolts and I also bought GM cylinder head gaskets along with new intake manifold gaskets to ensure zero leaks. Pulling the rear lower cylinder head bolts on the passenger side was a real pain due to the tight clearances next to the heater - A/C shroud. I found the best way to remove the two bottom rear head bolts and re-installing them on this side was to actually remove the motor mount bolt from the passenger side and loosen the driver's side bolt along with removing the rear transmission mount bolts and raising the motor approximately a full 4" on the passenger side for ideal clearance. This pic shows the re-installation process with the ported passenger side head reinstalled.
I re-dynoed the motor after changing the oil and using LS1_Edit for fine tuning of the air/fuel and timing achieved +33 RWHP and +29 RWTQ bringing the final engine power numbers in at 424 RWHP and 400 RWTQ! This makes the overall project gains from the very first best dyno pull of 288 RWHP/300 RWTQ a whopping +136 RWHP and +100 RWTQ on a stock shortblock!!! I'm impressed!
The dyno sheet below compares this last dyno run of 424 RWHP against the
stock heads at 391 RWHP:
Rear End Gears:
Since I want the optimum set-up for drag strip times using street tires and excellent street driving I changed the rear end gears from 3.73's to 4.10's. This change should enable me to cross the end of the track in a more optimum RPM range to take full advantage of the cylinder head/camshaft combination (traction permitting!). On the street the tires now break loose with less than 1/4 throttle in 1st gear and less than 1/2 throttle in 2nd gear :>O
I will be off to the track (weather permitting the first week of October). I hate to make you wait for the results but you're just going to have to come back one more time next month!
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© 2002 by John Bzdel