Hawk ported and decked head

[silva]

Head gasket seeping so i decided to mill and port head. I used a slightly larger tt250 intake manifold. The tools i used.

[silva]

stock exhaust port and ported exhaust. Head was decked .7mm

[silva]

stock intake port and ported intake with bigger tt250 intake manifold. Duct tape to protect valve seats.

[pistolclass]

awesome! any idea what your compression ratio will be now?

[Megadan]

Ya beat me to it! Pretty decent work so far. I might have left the exhaust port a little smaller at the exit to account for the copper gasket flattening out a bit, but it should still be pretty close.

If you deck .7mm, (.0276") that should put the compression right around 9.7:1 (give or take a tenth of a point.

You could still remove some material from the port roof leading up to the valve guide, and around the sides of the guide as well to open that point up a bit more.

Have any pictures of the runner bowls from the combustion chamber side after the port work. I have been contemplating how to attack them with mine.

[silva]

I went from a 98 main jet to a 100 main. I"m gonna try a 105 next

[Megadan]

You must be at elevation if you were running a 100 main jet after the port work, especially with that exhaust.

I am waiting for my new carbide burrs and some sanding rolls to get here so I can attack my head.

My plans are a bit more aggresive for the ports at the valve guides and bowls. There is a lot of material that can be removed there.

I also plan on decking .035 and smoothing the ridges down around the valve seats to unshroud them a little bit. (hoping to end up around 9.6-9.8ish) and polish the heck out of the chamber and exhaust port.

I have another week until I even get home to start my head. Stupid adult responsibility called work...

[silva]

Yeah i'm at 6500 feet

[silva]

bowls

[Megadan]

Looks good. Nothing too aggressive I see, just nice and blended/evened out.

[JerryHawk250]

Nice job Silva I'll be doing the same as soon as I get some spare time to do it.

[silva]

I can feel the extra 3-5 horsepower. Its running better with the 105 main jet, a 100 main jet was too rich in summer. I've been running a 98 main. I might try a 110 only because its cold now.

[JerryHawk250]

Did you get a chance to check if it may a difference in your top end speed?

[silva]

Yes it went from 63 mph to 68 mph gps, with my 16/40 sprocket combo. Now i need to do a run with my 17/40 sprocket combo.

[silva]

I tried a 110 main jet but it was to rich for my elevation went back to a 105.