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 May 6, 20215 yr by rem1313
incorrect information

Is your question about clearance between valve and rocker or valve and pistons? 

The valve and pistons

are '73 style' pistons flat top? If so, it'll be pretty close I think.

I'd mock it up with plasticine and check how much clearance there is. 

Thanks jonbill, The pistons are stock 73 style with the eyebrow cutouts.

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. 

Thank you Diseazd, appreciate the feedback