Newb ada head compression question for my SJ

[Harbor]

Use the long reach adapter. If using the short reach adapter and snap on gauge your reading will be low by 10 psi

 

[OSA758]

Use the long reach adapter. If using the short reach adapter and snap on gauge your reading will be low by 10 psi

Okay thanks il ask my buddy what adapter he used.

 

[SXIPro]

Yes tried it without and with cranking throttle same results. How would i check see if its a high compression piston? Is 83mm bore normal size for 701

A stock 701 is 81mm