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73 240z engine rebuild questions

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I'm using new 73 style pistons and want to upgrade cam to Comp Cams 280S-110 grind. The head has been surfaced at -.012. My main concern is valve clearance, I do plan to use cam tower shims but I'm unsure how many it might take to make this combination work.

Thanks for your help.

Specs for stock v. Comp Cams:

Comp Cams

Advertised Intake Duration: 280

Advertised Exhaust Duration: 280

Intake Valve Lift: 0.460

Exhaust Valve Lift: 0.460

Stock Cam L24

Intake Duration:   248

Exhaust Duration:  248

Intake Valve Lift:  0.413

Exhaust Valve Lift:    0:413




Edited by rem1313
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rem1313.....If you are using a 73 E88 head and only shaved .012 inches, you shouldn’t have any problems IMO. Those pistons are fly cut. If you use a cam with any more lift than .460,  you would need to use a shorter valve seal. 

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