not another cam question!!

I like the 250@, duration. The lift ,needs to be considered. Valve guide/retainer clearance,.050" minimum. A solid,requires a more aggressive spring. 120-140 ,on the seat,300-340,on the nose.Might need,to raise installed heighth,and mill the valvespring step on the heads. Here's a question: How mutch porting,was actually done?