Quote:
Originally Posted by indyta1989
The numbers matching block looks like it was factory double stamped both YS and YZ over the S (see photos). I suspect it is a standard YS Formula 400. I will leave the PHS up to the new owner to determine if it is indeed a YZ.
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The heads being 13s is another indicator of a YS engine. A factory YZ would have had 12s.
Neat car - good luck with the sale!