SM Head Modifications on a budget
I got some free time this evening, so the deshrouding of the intake valve is complete. The 15 degree top cutter was set to just touch the 4.170 diameter gasket line. This resulted in about a 0.060"-0.070"cut on the chamber wall. As can be seen from the before picture above and the after picture below, this was quite a large cut. Flow results are shown below. Nice little gain through most of the curve. Thanks Brian.
The exhaust valve seat has not been recut and the exhaust valve sits around 0.040"-0.050" higher than the intake. I think I'll lower the exhaust valve in the morning and also give it a radius. Won't be much but both moves should help flow a little.
I got some free time this evening, so the deshrouding of the intake valve is complete. The 15 degree top cutter was set to just touch the 4.170 diameter gasket line. This resulted in about a 0.060"-0.070"cut on the chamber wall. As can be seen from the before picture above and the after picture below, this was quite a large cut. Flow results are shown below. Nice little gain through most of the curve. Thanks Brian.
The exhaust valve seat has not been recut and the exhaust valve sits around 0.040"-0.050" higher than the intake. I think I'll lower the exhaust valve in the morning and also give it a radius. Won't be much but both moves should help flow a little.