yes...im going to do the clay test but im awaiting my cam and heads arrival and just curious.....it is a 331 stroker with forged flat top probe pistons, dnd 210 hawk heads 2.055 intake, 1.60exhaust, with a trick flow stage 3 cam.
All I can say is that if Flat top pistons are good, why did ford only use them for 86 model 5.0s? I hate them, I hate E6 heads too....hate, hate hate. They are great for compression, but mess up your cam and head selection.
As you know 2v, no one can answer the question for you. Even with identical pieces on another engine, the clearances will be different. You must measure. I'd ask the piston manufacturer how big (diameter) of a valve the reliefs will accomodate. With that big intake, you're gonna need to check vertical as well as radial clearance (edge of valve to edge of relief). Clay is the only way to measure the radial clearance. Be sure to use a solid lifter so plunger depression doesn't throw the measurements off. On that beast you're building, I'd want .100" clear on the intake, and .125" clear on the exhaust; .06.-.08" on the radial clearance ought to be fine.
If memory serves Probes tries to cut their pistons so that (with most normal applications) they will take a 2.05" valve up to .600" lift up to 240*@ 0.050" duration. But, Michael is right, clearances vary from combo to combo due to differences in deck height, head gasket thickness, and how deep the valve is seated into the head not to mention cam timing. if i had to guess, you should be good, but probably kinda close
That's pretty close to what I have seen, I have sneaked slightly larger stuff through but it depends.... Usually lift is not the issue (been well over .600) it's the duration and centerlines that will bite you... I won't even comment on the flat top issue
yeah, i borrowed a solid lifter from a friend and now i have to order and adjustable pushrod....thanks everyone for the words of wisdom i can always count on u
