I decided to weigh some engines to see if HB's are, in fact, chunky.

All engines are cross flow, baffle-piston engines. All were weighed with muffler, prop washer and nut.

The .40's:

OS Max-H - 11.8ozs (335grms)
Webra Blackhead - 13.4ozs (380grms)
K&B - 13.6ozs (385grms)
HB PDP - 17.4ozs (495grms)

The .60's:

OS Max-H - 17.4ozs (495grms) same as HB .40!
K&B - 17.8ozs (505grms)
Enya 7033 - 18.0ozs (510grms)
Webra Blackhead - 18.6ozs (525grms)
HB PDP - 20.2ozs (570grms)

There's a 5.6oz difference between the Max and HB .40's, and a 2.8oz difference between the Max and HB .60's.

David