Cam timing
The cam movement (retard Intake/advancing the exhaust) that Tom ("Don`t call me Dickie") Turner did on your motor did not create more overlap, but less. However it does increase valve to piston clearance if close, and it will increase the length of the power stroke improving torque.
Because of the slow ramp design on stock & typical aftermarket street cam, advancing more than a couple of degrees usually results in more loss from overlap than gain.
Ask "your Guru" Turner about his "electrical problem" with the EP car at Roebling Rd. (the #4 rod knocked the starter off!
)
The outline of the valve on the piston is really not uncommon.
The cam movement (retard Intake/advancing the exhaust) that Tom ("Don`t call me Dickie") Turner did on your motor did not create more overlap, but less. However it does increase valve to piston clearance if close, and it will increase the length of the power stroke improving torque.
Because of the slow ramp design on stock & typical aftermarket street cam, advancing more than a couple of degrees usually results in more loss from overlap than gain.
Ask "your Guru" Turner about his "electrical problem" with the EP car at Roebling Rd. (the #4 rod knocked the starter off!