jjw88mustang

Alright i have seen people on here talk about notching pistons and was wondering what they are talking about....i thought it might be for clearence or something

AdderMk2

the stock pistons have circular depressions cast into them. They are there for clearance between the valves and the piston. If you use a cylinder head with valves that are larger than 1.84-1.9"/1.54=1.6", you would not have enough room for the valve to open up into the piston at the end of the exhaust stroke/begining of the intake stroke.

jjw88mustang

so does it have to do with cam size?

AdderMk2

yes, to a certain extent.. it has more to do with the cam duration than the lift... but it is mostly dependant on the size of the valves in the heads

jjw88mustang

alright thanks for the info do you work at a shop or something you seem to really know your stuff

mjr46

notching is for clearancing for larger diameter valves

AdderMk2

Im currently Unemployed at this time... I'm trying to get into a shop right now, but its really hard to find a job around here

67mustang302

It's really hard to find a job anywhere lately now that the economy is starting to tighten up.

In case you're wondering what notched pistons look like, these are aftermarket, Mahle to be precise.

Don't mind the finger, it was for pointing out ring end gap.


[IMG]local://upfiles/67190/A8A60DE7E6D8453484A4C021C04A3E90.jpg[/IMG]

jjw88mustang

yeah that pic helps it make more since i havent rebuilt a v8 yet just fourwheelers all the time. but i am putting a new bottom end and cam under my car this summer so just trying to figure some stuff out, thanks