[Bruce Dorsi]

Welcome to GTT !

The Model 155-02 was introduced in 1959 and continued 1960 & 1961.

1961 was the last year for Bolens walk-behind tractor production.

Technically your tractor is a VersaMatic, not a PowerHo.
....PowerHo's were previous models without reverse, and had a different style hitch for front & rear attachments.

 

[Bruce Dorsi]

The Kohler K-160 was advertised as 6.6hp. ...The K-161 was advertised as 7hp, and replaced the K-160 in production.

The parts manual for the K-161's should show the variation numbers for your Spec # 28118.

The Bolens brochure that you posted does say Power-Ho, but none of the parts manuals describe a Versa-Matic as a Power-Ho. ....Dealers made a distinction between Power-Ho's and Versa-Matic's.

Over the years, we have discovered many proven errors in Bolens brochures, manuals, & publications. ....Printed info is a good guide, but is not gospel. ....Even back in a 1977 publication, Bolens listed the K-161 Spec 28118E as either a 6.6hp or a 7hp. ....There is no mention of a K-160 installed on a tractor, but we know there were, as you own one!