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TRW Pistons - Forged/Hypereutectic Buick 231/252/350/455

Part #'s starting with "H" = Hypereutectic Part #'s starting with "L" = Forged Part #'s ending in CP = Coated Piston

231 Engine (3.800 Bore x 3.400 Stroke) Part # Notes CID Comp. Ratio 48cc Comp. Dist. Piston Dome Shape Price/Each H521AP H521AP-20 H521AP-30 H521AP-40 H521AP-60 L2481F L2481F-30 H522P H522P-20 H522P-30 H522P-40 Turbo Turbo Turbo Turbo Turbo Turbo Turbo Non-Turbo Non-Turbo Non-Turbo Non-Turbo 231 234 234 236 239 231 234 231 234 234 236 7.57 7.63 7.66 7.69 7.74 7.87 7.96 9.55 9.63 9.67 9.71 1.800 1.800 1.800 1.800 1.800 1.825 1.825 1.855 1.855 1.855 1.855 .245 dish .245 dish .245 dish .245 dish .245 dish .245 dish .245 dish .135 dish; 4 reliefs .135 dish; 4 reliefs .135 dish; 4 reliefs .135 dish; 4 reliefs $39 $39 $39 $39 $39 $60 $60 $38 $38 $38 $38 252 Engine (3.965 Bore x 3.400 Stroke) Part # Notes CID Comp. Ratio 48cc Comp. Dist. Piston Dome Shape Price H471P H471P-30 H471P-40 H471P-60 H471CP H471CP-30 H471CP-40 H471CP-60 Turbo Turbo Turbo Turbo Turbo Turbo Turbo Turbo 252 256 257 260 252 256 257 260 7.71 7.79 7.82 7.88 7.71 7.79 7.82 7.88 1.805 1.805 1.805 1.805 1.805 1.805 1.805 1.805 .276 dish .276 dish .276 dish .276 dish .276 dish .276 dish .276 dish .276 dish $36 $36 $36 $36 $36 $36 $36 $36 350 Engine (3.800 Bore x 3.850 Stroke) Part # Notes CID Comp. Ratio 58.9cc Comp. Dist. Piston Dome Shape Price H644P H644P-20 H644P-30 H644P-60 H522P H522P-20 H522P-30 H522P-40 H522P-60 H522P H522P-20 H522P-30 H522P-40 H522P-60 - - - - - - - - - - - - - - 350 353 355 361 350 353 355 357 361 350 353 355 357 361 7.81 7.87 7.91 8.00 9.68 9.77 9.81 9.86 9.95 9.68 9.77 9.81 9.86 9.95 1.800 1.800 1.800 1.800 1.855 1.855 1.855 1.855 1.855 1.855 1.855 1.855 1.855 1.855 .135 dish .135 dish .135 dish .135 dish .135 dish .135 dish .135 dish .135 dish .135 dish .135 dish .135 dish .135 dish .135 dish .135 dish $38 $38 $38 $38 $38 $38 $38 $38 $38 $38 $38 $38 $38 $38

455 Engine (4.312 Bore x 3.900 Stroke) Part # Notes CID Comp. Ratio Comp. Dist. Piston Dome Shape Price 66cc 68cc 69cc 71cc 77.5cc H392AP H392AP-20 H392AP-30 H392AP-40 H392AP-60 L2353F L2353F-30 L2353F-40 - - - - - - - - 455 460 462 464 469 455 460 464 9.58 9.65 9.69 9.73 9.80 9.05 9.15 9.18 9.43 9.50 9.53 9.57 9.64 8.91 9.01 9.04 9.35 9.42 9.46 9.49 9.56 8.84 8.94 8.98 9.20 9.27 9.31 9.34 9.41 8.71 8.81 8.84 8.76 8.83 8.86 8.89 8.96 8.32 8.41 8.44 1.985 1.985 1.985 1.985 1.985 1.975 1.975 1.975 .130 dish .130 dish .130 dish .130 dish .130 dish .070 x 3.720 dish .070 x 3.720 dish .070 x 3.720 dish $37 $37 $37 $37 $37 $60 $60 $60

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