See if you can find the casting number on the head, but it might be under the valve cover.
A few things to do.
Look where the spark plugs go,
use a screw driver and clean the bottom of the hole as best you can.
Is it flat, and would accept the sealing washer that's on the top plug,
does it have a tapered edge of the threaded hole, and would use a plug like on the bottom.
Can you see how deep the threaded hole is on the head?
And finally, as a last resort.
Get some silly putty, plumbers putty, or play dough.
Rotate the engine over so that #1 is at TDC,
put a blob of the putty on the end of the long sprark plug and screw it in to the hole by hand, as deep as it will go.
Then pull it back out. Is the putty smashed from hitting the top of the piston?
Saturday, July 18th, 2009 AT 8:28 PM