I am no sure where this should go so I'll start here, I have an O S 30 stunt engine that I need some allen socket screws for, but I don't know the thred or the pitch, where might I get them, also might need a couple of the gasket sets also, tanks a lot...

Theyve got a soft aluminum head gasket , burried up in the ' rebate ' . Tease out with a scalpel tip . Re Roll Flat with round thing afterward .

Lotta guys just use silicone High Temp, on backplates these days .

Put a ' Large ' of the three OS Max 20 intakes in a O S 30 , centuries ago . Theyre essentially a 35 - S . Half the bits interchange .

The H 29 - R unbelievably has the same piston / liner / rod / wrist pin . So your allowed to run it on 20 % Nitro & race props too .

Bolts are 2 1/2 or 3 m.m. metric . or suchlike,  same as 35 - S anyway .

   Guy's I sure do than you a lot, Randy Smith suggested tapping 4-40 and it worked great so here is an up F Y I ..Bootlegger