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Does the C.R. seem low at 9 to 1 as measured , No. With the head gasket installed, your actual C.R. will be in the region of 8 to 1 Pocketing the pistons will reduce the C.R. further (because of the 2S cam) It says in the stage 1 tuning notes to shave 75 thou off the head to get the C.R. up to 10 to 1 and in the stage two notes to take 90 to 95 thou off to get 10.5 to 1 ( there is an error in the metric measurements stated on the stage two notes) I suspect the piston cutouts seen on the 750 pistons are machined over size so there is no chance of valve/piston hitting with whatever cam/valves are used.

[QUOTE="dobba99, post: 655141, member: 5834"] Does the C.R. seem low at 9 to 1 as measured , No. With the head gasket installed, your actual C.R. will be in the region of 8 to 1 Pocketing the pistons will reduce the C.R. further (because of the 2S cam) It says in the stage 1 tuning notes to shave 75 thou off the head to get the C.R. up to 10 to 1 and in the stage two notes to take 90 to 95 thou off to get 10.5 to 1 ( there is an error in the metric measurements stated on the stage two notes) I suspect the piston cutouts seen on the 750 pistons are machined over size so there is no chance of valve/piston hitting with whatever cam/valves are used. [/QUOTE]

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