Coast to Coast
DTT BOTM WINNER
crazypj said:Use modeling clay or Play Doh to check clearance. Michaels, ToysRUs, etc With pistons, the extra mass around gudgeon pins expands more than thinner sections which is another reason 'sides' are reduced diameter. If your pistons are sticking out 0.010", you use a 0.050" head hasket or next thicker one. You want around 0.035"~0.040" piston to head clearance
i'm having a hard time getting a good pic of the porting work. It's not stellar, it's not much - I didn't want to overdo it and run into lost power I have seen that on CB360 threads where a guy ported his head out and lost horsepower then argued that he needed better jetting on the carbs. LOL so all I did was smooth the transition area around the seats to get rid of any drastic surface changes, I then used a marker to indicated where on the intakes they matched up to the boots and opened it up so it's a perfect match now (and marked each boot left and right) on the exhaust side I used the old gaskets still in the head to mark the top portion for opening up to that diameter, d-shaped the ports, raising the roof a little where the valve guide bosses are and made the transition really smooth by shaving the sides of the boss near the tip of the guide so it's more triangular.
against all advice I used my dremel tool with a pen extension and carbide bits for this work - it actually went very well I took my time and had all the work done in less than 2 hours. the dremel worked very fast, and I am sure if I was using a 1/4" die grinder I would have destroyed the head in about 42 seconds. the bit also left a finish that is near identical to the factory cast finish inside the ports and I'm happy with that, as it will mean I didn't do anything too crazy changing intake velocity (I'm sure it's not as critical on the exhaust side) the lines inside the intake ports from casting were barely noticable, I took some time making sure that any protrusions were knocked back to the median surface area.
I guess I should assembly the valve train with springs then?
pistons are absolute level with top of deck with the .050" base gasket, so I have a .042" gasket. I wanted to get closer to the min spec but played it safe.
oh and eye candy since it's been a few pages since any good progress was made
got front end on so I could measure and make cables for remote master cylinder
I wish I didn't need a headlight