Piston to valve Clearance

KMC3420

KMC3420

Member
#1
#1
Building a GX160, picture below. Working on the head now. Flat top piston is at 0 deck height. I am running a RTC-8 head off of a predator as I don't have the original Honda head for this motor, and will be running a .040 Honda head gasket. My question is, what is the acceptable clearance between piston and valves? As I want to run this motor on 91 pump gas, and I also want to mill the head for higher compression. Please let me know if more info is needed. I have yet to put any play-doh between the head and piston, but will do so tonight to determine where my clearance is currently at. Thanks for any input.
Black Mamba1.jpg Black Mamba.jpg
 
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ole4

ole4

#2
#2
.080 exhaust is the critical one as piston is coming up to tdc as ex is opening. Intake could be a little less and still be ok. What is the cam duration ans lsa?
 
KMC3420

KMC3420

Member
#6
#6
ole4 said:
Then you should check but I have used that cam in a few motors with no issues.
Click to expand...
Yes, I will check for sure. Just wanted to know what number I was checking for as I have not milled a head before and checked clearances. Thanks for the help.
 
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