afr cam choice question

815 Views 6 Replies 5 Participants Last post by JBIGBOOTSY, Feb 3, 2008

speedtrip

Discussion Starter · Feb 2, 2008

Found lightly used fti cam ground for afr165 and my supporting mods. Duration @ .050 222/232 with 563/565 lift on 110 lsa. Will i have any issues with this head cam combo and stock pistons? And please dont say check p/v clearance because i havent bought cam yet. I will eventually check to be safe but would like to know before i buy. I dont want to notch pistons. Cam owner couldnt answer question he had shop build everything for him. Ive only assembled the stock components and have no experience with changing around the valvetrain...thanks

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JBIGBOOTSY

· #7 · Feb 3, 2008

jordan said:
man its not lift its valve timing that causes the pistons to hit the valves

It does play into it. It's just not the only factor. The higher the lift the more chance you have of floating a valve. That is where the problems lie also. lift, duration, LSA, inproper degree. Those are PTV clearance things to watch on the cam. Then you have to look at Pistons, deck, head gasket, heads, valvesprings..... All of these can cause a piston to kiss a valve.

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