Will 2.02 valves clear the pistons?

[RyaNCSU1]

Looking at purchasing a set of Doug Herbert heads. 2.02 intake 1.60 exhaust. They say they will clear hte pistons but I want to make sure they will. Stock bottom end on an 87 5.0. Planning on running a cam with .510 - .550 lift tops. Havent decided yet. I thought I had seen somewhere that only the TFS heads will clear a stock bottom using 2.02 valves.

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[mjr46]

most likely you'll run in to issues in the brow area, you'll need to verify ptv for sure

[RyaNCSU1]

One feature that is good and bad in these heads is that they are 64cc chambers. Not great for compression but should give me more room for the valves? Guess I may stick to the smaller range in the cam as well to help with the clearance, maybe .520's somewhere.

[mjr46]

chamber size has nothing to do with ptv clearance, nor does cam lift, it's all about cam timing

[RyaNCSU1]

Would think having the larger chamber size would recess the valve that much more into the head? No? Im obviously just learning. By your statement I could even have the heads milled down to 60cc to help the comp. and have no impact on the vtp?

Maybe I will go that route and just go with a less aggressive cam with very little cam advance.

[mjr46]

milling head will up compression, mill it to much and intake alignment issues will result, you want assurance, a custom cam can be designed to work with a stock bottom end and 2.02 valves

[redemption]

just get some playdoh putthe heads on with 2 rods in. crank it over 3 times slowing makng sure there is no binding, then take off heads and measure gap between playdoh were valve compressed, im trying to remeber. i think tis .090' and above you want

[fs308]

clay it up and check for yourself. every motor is different so even if it did clear on someone elses doesnt mean it will work for yours

[RyaNCSU1]

thanks