2v pi cams, valve to piston clearance - Mustang Evolution

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Old 12-07-2008, 06:50 AM   #1
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2v pi cams, valve to piston clearance

Can someone tell me definitely that there is sufficient valve to piston clearance on a stock 1999 and up 4.6L 2V motor with a 17cc dish piston using Comps XE270AH cams, because Comp Cams can’t? Comp Cams told me that Ford used three different piston manufactures, I think that this uninformed fellow was referring to the three different piston dish measurements of 11cc 92-98 2V, 17cc 99 and up 2V, and 3cc for 4V motors since 93. There is a lot of contradicting info on the web about this set up, can anyone please shed some light on this set up. Thank you.
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Old 12-08-2008, 09:29 AM   #2
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Re: 2v pi cams, valve to piston clearance

that cam was built for the 99-2004 2v heads, the older heads are the ones you have to watch for because they had the smaller cc pistons although i have never heard of the piston slapping on that cam even on the pre 99 cars, the lift o those cams are not much more than stock, they tnd to just increase the duration, the motors are so close tolerance that you cant put extreme cams in them anyways without running aftermarket pistons, that cam will go on your car all day
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Old 12-08-2008, 09:40 AM   #3
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Re: 2v pi cams, valve to piston clearance

comp doesnt make a cam that will slap piston on a 99-2004 mod motor.
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Old 12-13-2008, 06:59 AM   #4
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Re: 2v pi cams, valve to piston clearance

uh yeah they do. the 270 has to be degree'd correctly to clear a 270. the 278 is huge and will have ptv issues if not maticulously degree'd. the 270 can clear a pi swap 4.6, they have to have attention to detail with degreeing them as well.
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