I have an lq4 with l92 heads and I wanted to know if it added any PTV clearance or if the ms4 cam would still require fly cutting?

 

The bigger valve in the L92 heads will reduce PTV.

The Magic Stick cams aren't really a good match for L92 heads anyways, at least in my opinion.

 

Also, large port heads+large cam+low compression=a complete turd at low rpm's.

 

But bigger valves and more peak flow means more benchracing power and that is what really matters.

 

What if I mill and flycut to kill two birds with one stone since I'm already in there.

 

Why are the l92 heads and m.s. cams not a good match??

 

The big valve square port heads flow better on larger bores, and tend to prefer different cam specs than cathedral port heads.

By the time you mill the hell out of them, fly cut and all then find out average power is not improved you likely would have been better off with a ported cathedral head.

 

Because it was designed to work with cathedral port heads.

 

I see thank you guys