Arthur Kratz

Dear Scott and Mike,

Thank you again for all of the help, support, and PARTS THAT WORK in completing our rebuild of this 1986 Porsche/Chevrolet 911. We could not have done it without your experts!!!

As you may recall, this particular vehicle was originally converted by "the other guy on the West Coast". When the car was brought to us, it has numerous problems which should have been avoided had the conversion been better engineered. The car ran way too hot and could not be kept cool even in normal driving. We purchased your complete radiator and cooling system kit which made HUGE difference in the running temperature of the engine. We could actually run the car long enough to find other problems with the engine.

Without going into the laundry list of problems, the engine had to be disassembled at which point we found a crack in the crankshaft. The choice of internal engine components was also somewhat "unique". High compression pistons (13:1), way too large camshaft which was too far advanced, ignition timing backed off (just so it could run), and a un-port matched manifold going into modified AIRFLOW RESEARCH 190R cylinder heads did not seem to make practical (or logical) sense. The 4 puck clutch disk and washer spaced pressure plate wanted to be in or out only. The car was not streetable at all.

The customer's objective was to have a strong, reliable, high performance engine that was very streetable and could still run on pump gas with air conditioning. We rebuilt his engine with the following items:

350 Chevy 4bolt main block with studded main caps
SCAT 4340 Forged 3.750 stroker crank for 350 mains
SCAT 4340 Forged H Beam 6 inch connecting rods
KB Hypereutectic Pistons (.040 over). Compression 9.5:1 for 6 inch con rod
Comp Cam 12-433 Hyd Roller Cam and Lifters
AIRFLOW RESEARCH 190R Aluminum Cylinder Heads with 2.080 intake valves
Weiand Stealth Dual Plane Manifold, port matched
Renegade Hybrid Heavy Duty Pressure Plate, and Kevlar Disc.
Mallory Unilite Distributor, coil and wires
Renegade Hybrid A/C Condenser with mounting bracket
The completed car is a totally different machine. The engine has smooth pulling power all the way up to 6500 RPM with no histrionics. The car is very streetable with a steady idle and mellow exhaust note. We have not yet dyno tested the car but estimate engine horsepower at about 500 with peak torque at about 575 ft-lbs. The air conditioning keeps the interior cool while the Renegade Hybrid Radiator with Dual Fans keep the engine temp in the "happy" range. All in all, a great ride!!

Thanks again for all the help. Hope to meet up with you guys at the next SEMA Show in November.

Sincerely,
Arthur J. Kratz - Owner/Manager of Performance Engineering


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