Page 74 of Buick Performance Parts Catalog by TA Performance

FORGED STREET/STRIP PISTONS 480-922-6807 Order and Tech Line www.TAPERFORMANCE.com TA Performance Products, Inc. 74 When a more durable piston is required either for race or with the addition of nitrous or forced induction, TA offers economical forged pistons. These pistons are based on the stock design and are available in stock compression ratios. The forging process makes the aluminum stronger than with a cast process which allows these pistons to handle extra abuse. Wrist pins are included with all forged piston sets. Please specify engine size, overbore.. Notched pistons for additional piston to valve clearance available (exclusively from TA Performance) upon request. Part Nos. TA 1616A `78-`87 231Turbo V6, Low Compression (+.030, .040) ......................................................................... 359.99 TA 1621A `70-`76 455 (+.030,+ .040), 10:1 CR ................................................................................................ 399.99 TA 1621B `70-`76 455 +.030, +.040) WITH Notches, , 10:1 CR ........................................................................ 485.00 ** Note: Compression ratios are advertised and may not calculate out the same with your combination, please inquire when ordering Forged Production Pistons Spherical Dish Forged, Light, Street/Strip Pistons 231 Turbo 455 25cc Dish, 1.985 Compression Height Our Spherical Dish piston is specifically made for Street/Strip 455 combinations. This unique piston is precisely made for us by the world leader in high performance piston manufacturing. The design of these pistons allows for a press or floating pin configuration on stock, forged or billet rods. They yield a 9.8 to 10:1 compression ratio on most 455s using stock `67-`74 heads as well as our S tage 1 and Stage 2 series heads. These pistons on average weigh 856 grams with the wrist pin which is almost 200 grams less than a stock piston with pin and 130 grams less than the production forged piston with pin. Many high end machining features that are commonly found in Pro Stock pistons are incorporated in the TA Spherical Dish piston. For example: The top ring land has multiple grooves machined into it which results in a Reduced Contact Area, thus reducing the drag on the piston. An Accumulator Groove is incorporated in the second land between the top and second rings, this feature displaces compression gasses that can cause ring flutter. Double Pin Oilers scavenge oil from the oil ring then utilizing internal passages direct that oil into the wrist pin boss. Oil Return Holes in the oil ring groove return excess oil to the crankcase through the underside of the piston, this feature also aides in the cooling of the piston. Contoured Skirts remove unnecessary material to reduce weight. These pistons also have a specially Cam Ground Body, this procedure makes the piston slightly out of round. By doing so the loads of the piston are distributed more evenly which greatly reduces the stress on the cylinder sleeves and is attributed to reduced cylinder wall breakage. The most unique and exclusive feature of these pistons is the 20 cc Spherical Dish. The Spherical Dish, unlike a conventional stepped dish, directs the forces of the combustion gasses to the center of the piston. This in turn forces the piston down straighter plus the energy is concentrated down the centerline of the rod for a more efficient, horsepower improving cycle. Lastly, these pistons incorporate generous Valve Reliefs that will accommodate almost any valve lift. Like many of our products, we truly believe this is the best product for the money. There are other, less expensive pistons, but for the little bit you save you are losing out on some additional features that really DO make a difference in the power and durability that your combination is capable of. Many of these features are omitted or beyond the capabilities of other piston makers. Additionally, these features usually are expensive options, but we have worked diligently to make them TA standard features. TA 1611B Spherical Dish Forged Pistons, 455, .038 overbore ..... $599.00 20 cc Spherical Dish 455 Pistons w/pins weigh 988 grams Simple demonstration of Spherical Dish and the more common Stepped Dish Designs SPHERICAL STEPPED

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