Basic engine nomenclature
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| − | BLOCK DECK HEIGHT: Measurement from the centerline of the main bearing bore of the block to the flat part of the block deck where the heads bolt on. Blueprint dimension of a Gen I small block Chevy is 9.025". Not to be confused with PISTON DECK HEIGHT, which is the measurement from the piston crown to the block deck with the piston at top dead center. BLOCK DECK HEIGHT is shown here, but is mis-labeled as simply "deck height". It should have been labeled "BLOCK DECK | + | BLOCK DECK HEIGHT: Measurement from the centerline of the main bearing bore of the block to the flat part of the block deck where the heads bolt on. Blueprint dimension of a Gen I small block Chevy is 9.025". Not to be confused with PISTON DECK HEIGHT, which is the measurement from the piston crown to the block deck with the piston at top dead center. BLOCK DECK HEIGHT is shown here, but is mis-labeled as simply "deck height". It should have been labeled "BLOCK DECK HEIGHT". |
PISTON: Pistons come in 3 flavors, cast aluminum, cast hypereutectic aluminum and forged aluminum. Hypereutectic means that there is a very large amount of silicon in the mix when the manufacturer casts the piston, which gives the piston a different set of operating characteristics over a conventional mix with a standard amount of silicon added to make a conventional cast piston. In addition to the obvious diameter measurement, there is a measurement of the centerline of the wrist pin to the crown of the piston. This measurement is called COMPRESSION HEIGHT.... OR CH for short. This diagram shows CH..... | PISTON: Pistons come in 3 flavors, cast aluminum, cast hypereutectic aluminum and forged aluminum. Hypereutectic means that there is a very large amount of silicon in the mix when the manufacturer casts the piston, which gives the piston a different set of operating characteristics over a conventional mix with a standard amount of silicon added to make a conventional cast piston. In addition to the obvious diameter measurement, there is a measurement of the centerline of the wrist pin to the crown of the piston. This measurement is called COMPRESSION HEIGHT.... OR CH for short. This diagram shows CH..... | ||
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