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Old 05-01-2005, 03:56 PM
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Clearance concerns

I recently purchased a new 5.0 shortblock, from Ford Racing, to replace my worn-out '89 Mustang engine. I also purchased AFR 165 heads (pedestal style), an E303 (Ford Racing) cam and a set of Ford Racing M-6564-A50 1.7 ratio roller rockers.

I am not terribly experienced in engine building, so I am calling upon the combined wisdom and experience of the forum to either allay or confirm my fears.

My question is this: With the combination of the AFR 165 heads, the E303 cam and the 1.7 ratio rockers, should I be concerned about valve to piston clearance?

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Old 05-01-2005, 04:05 PM
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I'd be concerned enough to mock it up and check it regardless of what engine or combination. You should check the quench while ur in there also.
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Old 05-01-2005, 04:25 PM
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Do the 165s have 194 valves? If so you should have room.

I have a set of Trick Flow heads with 2.02 valves. I ran the Trick Flow cam with .542"/.563" lift and 224o/232o duration. I had to retard the cam for it to clear. Even then it had .80" clearance.

It is a good idea to check anyway. You never know if the cam might be different than advertised. It is cheap insurance against piston to valve contact.
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