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These were posted on the Shitty Years Pontiac forum today.

1989 ARCA 200

Well I was hoping to wait and get this all on my web site, most of us are not too concerned as we already have it in our cars, but seems the info is spreading in it's need/interest, so for everyone, here is what I have found so far, please add anything I missed: As for the engine and the McLaren Project, first off Dean is Vice President and Director of Facility Operations, great guy and a very sharp/smart man, we have talked on the phone, and met a few times at car events such as SAE MotorSport Conference and the SEMA Show, Wiley McCoy was there too, great guy who is also very sharp with a real passion for cars, and our/his baby. To repeat some of what was said before, but more so to put all the info in one place, here is what was done to the TGP engine and a little more, some components are used in other vehicle engines as well (see post below for casting numbers). "Select engine components" meaning they were checked when taken from the parts bin for closer tolerances, that includes some of the engine items listed below: Unique Vin V version of the VIN T Block, part number 10140528, stock VIN T Block is part number 10089656. Block, 20% Nickel content to improve strength, very small amount of tin for same. (Yet unreleased at that time), head casting 10087511 and its larger, less defined heart shaped combustion chamber, with the deep dished 28cc/ml piston top to achieve the .1 drop in compression ratio to 8.8 (or 8.78 depending on what you read). Forged Rods, these forged versions are unique to the 1989-90 TGP and TSTE only, part number 10070113, C-1037 Heat Treated Steel Forging, SAE 1050 Air Quenched Rod Caps. Hardened Crank (Nitrided), Nodular Cast Iron with journal camfer/deep rolled fillets, casting 981 but this one IS unique to the 1989-1990 TGP and TSTE, worked on after starting as a 981 crank! Part number 10110549. Ion Nitrided/hardened depth of .02"-.03" raising surface hardness from 30-35 Rockwell C to 60 Rockwell C. Mahle Autothermic Hypereutectic Pistons with Reinforcement Bar/Steel Strut to add strength to the top of the piston, 12% Silicone. Stock 3.1L cam, as used in the 2.8L, 3.1L Vin T and Vin V. Mellings Iron Body High-Volume Oil Pump. Engine Oil Cooler as some Monte Z34s had, maybe others, unique water tap to regulate water to turbo, and fittings to plumb it in. Coolant line take off welded on to provided for turbo water system return. Oil tap port fitting added to block/metal braided hose for feed line to turbo. Unique oil pan with turbo oil drain line fitting, and metal hose extension. Unique Rear Exhaust Manifold to feed with other Exhaust Manifold the Turbo’s Exhaust/Turbine Side, constructed of cast nodular iron. That damn OEM Crossover Pipe. Larger 22 lb injectors. Upgraded Fuel Pump taken from the Vette Parts Bin. Garrett Water Cooled Turbo, T25 though smallish, at least one of the larger versions of it, for less lag problems though all lag is programmed into the chip, unplug the computer from controlling the boost and tire smoke in less than a second, way too much boost/spin to get a good launch, needs a bigger turbo for lag and traction control! Boost control solenoid and lines. ABS Unit Heat Sheild. Unique Fuel Supply/Return Lines/Engine Bay Area, in front of ABS Unit. Tranny setup is unique, larger tranny cooling lines and an aux tranny cooler in fender well. Hardened Gears and Gear Carrier Set. Additional Nested Accumulator Springs, other little changes to the tranny, some not listed until it's taken apart for inspection. 1898 rpm Stall Converter, not a High-Stall as the stock turbo is not large enough to warrant it! Vacuum Line Check Valve/Bleeder at Modulator, Vacuum Line has internal restictor in-line to limit boost pressure and to allow check/bleed to fuction. Larger (Blackstone) 3 Core Radiator that is plumbed for the larger tranny cooling lines. Largest Electric Cooling Fan from the parts bin at the time, for main engine cooling. Secondary/smaller cooling fan to assist engine cooling, condenser and intercooler air flow needs. Blackstone Air-to-Air Intercooler. Some other things but this should get out most of the info people are interested in. Enjoy! Jeff M