I am trying to figure out if I am going to have piston to valve clearance problems, so I thought I would run it by you guys to see if anybody has ran this combo. The pistons I am using are speed pro part # L2465F60, I believe they have a .210 dome height. The cam that I am really wanting to use has a lift at the valve of .612(intake), and .630(exhaust). The heads are stock #781 with the bigger valves put in. Am I going to have piston to valve clearance problems??

Thanks Guys!

The only way to really know without guessing is to mock the block up. Use some modeling clay on the pistons, torque the heads w/ gasket and rotate the engine by hand. I would do every piston. Then measure the clay and determine the clearance. You could do it without the gasket and add the gasket thckness to your measurement.
This will be the only true way of finding out if its a go or no go. Anything else will be a educated guess ;)

Read This:
http://www.iskycams.com/pdfcatalog/PAGE181.pdf

Thanks for the link, DEEBOO! I know about the modeling clay method, I was just hoping to get an idea about this before I ordered the cam. I am trying to decide between two different cams, and I am leaning towards the one with the bigger lift. However, if the greater lift is going to cause problems, I would rather go with the little bit smaller cam.

I was running a .215 dome piston with big valve 049 heads, milled to 115 cc...cam had a .620 lift, and I had plenty of clearance...Im not saying dont worry, you certainly have to check, but you dont usually get into problems till you near the mid 600 lifts or more...and there of course are other variables, like your cam timing. I dont see any sense in checking every cylinder though, there should be no difference from one to the next. Make sure your springs are appropriate for the cam that you're interested in. Also, in the Isky link, I used the light spring method..I have used them both, and like that method much better..Its more accurate, and in the unlikely event that there is no clearance, you dont have to worry about cranking the valves into the piston and hurting something.

Well the only way to tell is buy assembly and measuring.But I can tell you that I use .340 dome pistons 115cc chamber with the 288/296F10 255/263@50 612/630 lift with plenty of room to spare.

Mark,
I see dome height being mentioned in this thread about p/v clearance & just want to clear up what may be a bit of a misconception.
The dome height has nothing to do with p/v clearance.
It is the valve relief's in the pistons not the height of the domes, they are two entirely different things ;)
And as Deeboo has already said, check it graemlins/thumbsup.gif