Re: Mystery of the ZL/X
Mark, you're forgetting about the -990 heads. Cast iron, square port open chambered head. Sold over the counter, with an L-72 long block, made for a mean motor.
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COPO 9561/9737 M40 X11D80
13.37 @ 105.50 on pump gas,drove it to NATL TRAILS and back [email protected] SCR22
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