The Subaru dog leg port is the most challenging port by hand or by cnc machine because of its complex shape! Watch Dave show you how to take on this challenge and he even shows you how to make fins in the port!
The Subaru dog leg port is very similar to the Harley Milwaukee 8 exhaust port.The M-8 is what I do the most of these days. I also use the 3/4" super spiral ball for most of the M-8 port. It truly does a great job shaping a round port. I was looking at videos to see if anyone might have a different perspective on working this type of port. I saw a lot of videos by guys who have very poor technique, or don't seem to know what they are doing, or why they are doing it. Your approach is the same as mine. Thanks for taking the time to post your videos. As I am slowly approaching retirement from the business it is gratifying to see you helping to develop a new generation of cylinder head specialists. (I am not planning to retire, but I'm in my 70's, so it's inevitable)
I just reworked some SOHC EJ25 heads this weekend. Heads were off for leaking head gaskets (of course). Engine has 180k so no way am I putting it back together without retouching the valves/seats - which means there's no good reason on earth not to spend a few hours giving the bowls/ports a good once over.
Hmm,yhamk you for all of your Greatips. For Your standard ohv 2v pushrod engines generally you don't need the 1/2 however i think I will use your flapper idea on the ssr.
Awesome video guys! Gonna have to check out you other videos. Just picked up some b25 heads and was thinking about porting the exhaust side. But im guessing its better to do both in tandem seeing as they work "together". Subscribed!
Great video, easy to understand. This is the only channel that i trust after seeing a lot of people gouging out their ports. What are your opinions on porting Nissan's vq35de heads?
I don't see how adding a fin in the exhaust helps with air speed. If you wanted airspeed you would have just kept the cross sectional area of the port constricted. That fin just looks like it follows the casting and not how the air would want to flow through the port.
So port matching is inadvisable. But what about the big port heads? They have a couple MM bigger ports. Are those bigger all the way in? Can't you get a regular port EJ to that degree?
