405HP_Z06

iTrader: (11)

Anyone running Dart 225cc heads checked valve drop? Some of the threads on this forum indicated that a box stock 225cc Dart has

Intake: .140
Exhaust: .172

I had my 225's flat milled .022 and this is what I came up with:

Measurement setup:



Intake Reading:



Exhaust Reading:

405HP_Z06

iTrader: (11)

Anyone? Bueller....Bueller....

405HP_Z06

iTrader: (11)

Come on, surely some one else has measured this!

chopper

iTrader: (18)

Must just be Me but this is something I have never heard of. Could You explain what You are measuring and what is learned from this? Sorry for My ignorance but You have Me curious. Thanks, Carl.

405HP_Z06

iTrader: (11)

Sure, I had never heard of it called 'valve drop' either until I heard it on this site.

Valve drop is the distance from the highest point of the valve to the deck surface of the cylinder head. This measurement is used to aid in roughly determining piston to valve clearance. I use Engine Analyzer Pro and this is a very nice measurement to have because the software will display PTV clearances throughout the engine cycle.

To measure it you set the head, deck side down, on a table and measure how far the valve goes before it hits the table.

chopper

iTrader: (18)

Thanks for the reply! Even at My age I learned something new!
Here's Ya another bump to get the answer You wanted.

Damian

iTrader: (89)

I've never had experience with these heads but i'd like to know an answer to this as well for future builds.