Hello, Have done a pretty full resto on the VW van..... panels, paint, interior, brakes, wiring..... ...... you know how it goes..... (on & on!!) Anyways, we took our first camping trip, (really loved it - VW at the pub Wimborne 2019) Pleasure..... followed by pain.... the 1641 lump struggled.... we now know the crank has movement - we have end play on the bottom pulley..... We have a big decision: 1. rebuild the 1641 lump 2. rebuild 1641 but upgrade to 1776 or..... 3. buy new 1776 lump from heritage. Personally, cannot go for the unknown, buy from ebay option - so unknown, what you are buying / quality of work..... What do you think? What did you do? Currently, have resto van but cannot drive it!!!