Anyone have a stock H22 head that they can take some measurements of the exhaust ports from?

I'm looking to see how much larger they are than the F22A ports. If they are larger I may end up porting mine a bit more than I already have.

A stock F22A* PT3 head has rectangular exhaust ports measuring 45mm wide x 30mm high. Any info on the H22A would be greatly appreciated.

 

Pop into vatozone and grab a gasket.

 

just measure it off my stock head
it's oval shape
44.45mm wide
33.02mm tall

 

whats the PTA measurements?

 

I have found that a lot of gasket sizes aren't always the same as the port measurements. Plus I'm too lazy to drive to get the measurements myself. I figured that someone would have a head that they could measure.

Thanks a bunch zuptidi. That's kind of surprising that they are pretty much the exact same size. I was actually thinking that they might be wider. The F22A was 44.5mm, I rounded up to 45mm

 

What do you mean by PTA?

 

I have to also agree that that is a lot closer than i would ever have guessed. I have nothing to compare my F22A head to, other than online pictures, but the exhausts ports look pretty tight on these heads

 

my bad i see u've put f22 measurement in op

*edit*
i just read your build thread.
The heads look really good! Which head do you think will flow better?

 

The P0B F22B2 has 45mm x 34mm exhaust ports. The ports on it are larger on the exhaust side. However, the intake valves are 2mm smaller and the intake port is a bit smaller as well. Very restrictive choke point at the opening along the port floor. to open if up to match the F22A ran the issue of not having enough surface for the gasket to seal too.

Thank you. The F22A is definitely going to flow better. I just finished dishing out the combustion chamber to match the 89mm bore, de-shroud the valves and took the exhaust ports out to 47mm x 33mm at the exit. The F22A has much more material around the exhaust ports to work with when it comes to removing the choke point. Although you don't want to remove to much..... Keeping velocity is still key.