Porting 394 cyl

[parrisw]

Don't loose faith.
There has been enough info here for you already.
Do your exhaust and inlet as described.
Remove base gasket checking squish.
Do a muffler mod.
Put it back together and see how you like it.
You can always go back in if you want more.

Al.

Thanks for the kick in the butt!!

 

[JT78]

When I ported my 359 I removed the base gasket and used some playdough on top of the piston to measure the squish. I then put the jug on and used a pencil to trace around the inside of the exhaust port with the piston at top dead center. Then I started removing some material I widened and raised my exhaust and widened my intake a little. I then retraced my exhaust port with the piston and I could see how much material I had removed. Your idea of measuring from the bottom of the jug to the top of the exhaust is good for height but I like to trace the port on the piston so I can see the room on the sides of the skirt.

 

[JT78]

Also I have to give credit where credit is due tracing the port onto the piston was not my idea I learned that from another saw builder.

 

[parrisw]

When I ported my 359 I removed the base gasket and used some playdough on top of the piston to measure the squish. I then put the jug on and used a pencil to trace around the inside of the exhaust port with the piston at top dead center. Then I started removing some material I widened and raised my exhaust and widened my intake a little. I then retraced my exhaust port with the piston and I could see how much material I had removed. Your idea of measuring from the bottom of the jug to the top of the exhaust is good for height but I like to trace the port on the piston so I can see the room on the sides of the skirt.

Thanks for the tips.

Will

 

[parrisw]

Well sorry guys. I chickened out on this build. I just put it all back together stock. I'm running on limited time lately, and didn't want to chance messing up a 394 cylinder. I have a 395xp project that I will do it on, when I have more time.

Thanks again for all your advice.