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Gary, ASE Certified Technician
Category: Car
Satisfied Customers: 1115
Experience:  Senior Technician
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I have a 2007 suzuki forenza head was warped so i had it

Customer Question

i have a 2007 suzuki forenza head was warped so i had it shaved. put it back together realized while it was at tdc it was impossible to turn cam shafts due to valves hitting pistons. bled lifters wondering if i need new lifters or if maybe there was too much shaved off any insight to fix my problem would be great.
Submitted: 1 year ago.
Category: Car
Expert:  Gary replied 1 year ago.

Hi there,

As with any twin cam engine, if you turn the crankshaft 90 degrees, all the pistons will be half way in the bore.

You can turn each cam one at a time, to the timing marks.

Then return the crank back to it's timing mark, if you went forward 90, turn back 90.

Now fit the rest.

Be aware that some heads aren't meant to be shaved, piston to valve clearance could be an issue.


Customer: replied 1 year ago.
how would i know if its not supposed to be shaved?
Expert:  Gary replied 1 year ago.

Hi there again,

Some engines are ok, depends on the manufacturer.

Most engines have a minimum thickness allowable after machining.

If your head is still above the manufacturers min thickness, you should be ok.