Have owned a 422 for 11 years and spent seven years doing a pretty complete
overhaul. Have met several other owners and toured several 422s and 424 plus was active on the respective
forums so think I can offer some insight.
First, the hulls are identical, at least from the outside. The big difference is the
center cockpit 422 vs aft
cockpit 424. They can rigged as sloops, cutters, slutters and ketches. Slutter being a
sloop with the added staysail vs a true
cutter where the
mast is moved farther aft.
On my boat the
hull is balas cored from the
water line down, solid glass above. I did a peal and seal on the hull and could see the balsa
core quite clearly once the gel coat was shaved off and it was bone dry. Verified by two, high end moisture meters and a
core sample.
Pearson left out the balsa and made a large solid glass area everywhere they installed a through hull. As far as I know all the hulls were built the same way.
Deck is also balsa core and unless the PO took GREAT care of it, you will find some wet spots: around the stanchion bases especially where the gates are and people used the stanchions for hand holds, chainplates. The worst spot for me was around the bolts mounting the manual
bilge pump under the floor of the cockpit but none were too extensive and all easily fixed by opening up, taking out a bit of wet and filling with thickened
epoxy.
Pinhole
leaks are sometimes found in the
diesel tanks. 422 the
tanks are under the settees in the main
cabin and easily removed for
repair or replacement. 424 tanks are behind the
engine and you have to pull the
engine or cut the tanks out. 424 the engine is mounted slightly farther aft and access to belts, pumps, etc is a bit more problematic. 422 the engine is under the cockpit with a door to the engine room in the aft
cabin giving great access to the front of the engine. Yes front of the engine because they all have a v-drive with the engine mounted facing aft.
The 422 water tank is installed in the
bilge sump area. Not sure where they put it in the 424.
That covers a few of the main differences. Feel free to contact me if you have further questions.