I have a similar cam and rockers and canfield heads and mine did not clear. I had to have the car towed up to a shop that does fly cutting. They used a canfield head and a tool that went in to the valve hole and cuts the pistons. It cost me about $200.00 to have it done.
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James Cox
nochevy@hotmail.com
1991 Mustang LX
No times with 347 stroker yet.