what we started with when it got to Bob's shop. I'm
showing before and after pictures
to show the types of cleaning that can be done to a block after
it is disassembled.
just got a quick cleaning and then the plugs were removed before
the acid tanks for the final clean up. As one can see, the
guides are new from last fall.
The Dupli-Color Ceramic 1200
degree paint does not come off easily. It took a
long time in the acid tank to get it all, but it did come out
what you get most of the time, but it's not quite good enough to
get the remaining
rust and potential crud that may be lurking in the oil galleys
or coolant passages.
will go through the hot acid tank cycle to remove everything else.
A lot of
checking and machining is done on this machine.
will be resurfaced on another machine after the guides are
are checked to be sure that they are installed correctly and
valve is matched to a guide and the clearances and movement is
everything is measured and verified, the guides will be cut for
All set and
ready for phase two, which will be resurfacing or "shaving".
will be shaved or resurfaced to remove sufficient metal to
raise the compression to 9.5 to 1. This head had .080"
removed last fall, but will
need an additional .040" removed even with .008" being taken
from the block.
work is done via CNC and verified before the machine is even
take several cutting passes over the head to remove the proper
amount of metal.
a lot better and just about ready for the valve seating work and
smooth and perfectly square.
valve job begins.
The seats and valves have been cut to match and the valves are
being lapped in.
springs have all been tested for compression and height and are
ready for assembly.
it's time to fit the new seals to the newly machined matching
not Teflon seals. Bob will no longer use them. But
newly machined shims that will fit under the springs to prevent
any cutting into the head and the subsequent chatter and failure
that will occur.
A close up
of the assembled springs over the shims. What can't be
are the spacers that go between the inner spring and the guide
to keep the
spring from walking around on the head at high RPM's.
of each chamber is next and all are matched across the head.
elaborate setup with a very tall graduated cylinder for the
assembled, but a few sharp edges to polish off and some clean up
on the chambers.
ready to go home for painting.
a lot better and will perform a lot better when installed.
really nice and neat job by Bob Mason.
masking tape and a warm sunny day is all you need to paint it
coats and one medium coat done within an hour and three days
of no touch drying and this paint cures and lasts very well.
coat will be applied to the entire engine after final assembly..
fine job by Bob Mason of
53 Hartford Avenue
North Scituate, RI 02857
Toll Free 888-235-1622