This maybe an indication of too much time on my hands! Will a 4218av engine fit in a 3314 chassis? 3314 blown engine and the 4218 has a ruined chassis.
Sorry to be answering so late after the question, but I had reason to search this info out and found the piston/cylinder to be identical on the two saws I had.
The P3314 listed and the 42cc 18in (3rd pic, and buried in 4th pic) are the same strato piston and cylinder (many other parts should be identical).
Are these the saws you're referring to?