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Z20 NAPZ vs. L20?


metalmonkey47

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  • 1 year later...

It's a Z20S block and pistons. Probably swapped to replace a blown Z20E motor. Thing is the flattop pistons are mated with a larger Z head on the Z20E. The Z20S used a smaller combustion chamber head to offset those dished pistons.

 

Matt the truck Z20 motor also used the flattops and long rods but also the smaller cc head from the car Z20S (A10) to achieve a 9 to 1 compression.

 

Z20E piston from 200sx

motorZ20EandZ20S720pistons4-1.jpg

 

Z20S piston from A10

motorZ20EandZ20S720pistons3-1.jpg

 

The Z20E, Z22 truck and Z24 heads are 57cc

The Z20S from the A10 and the Z20 used in the 720 are about 45cc.

 

what does that 34# on the piston mean? i just opened my 1980 L20b and the psitons have the same number on top.

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