8.5:1 CR.
Piston weight 350gr.
Piston pin weight 97gr.
Head type: Flat top. Dome +1.5cc.
Compression height 1.375″.
Bore 3.4980″.
Stroke 4.250″ (4-1/4″).
Rod length 7.440″.
Cyl. length 5.550″.
Comes with T5 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise.
Note: Top compression ring will need additional clearance.
See instructions.
Fits:> 84-99 1340cc Evo BT (NU)
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