just picked up an 83 glastron it has a valvo penta in it the engine is seized want to rebuild it but don't know where to get parts.is there anywhere like summit racing I can go for parts
first, welcome aboard
next, you need to identify the motor. if its a 4-cylinders, its most likely a volvo only motor . look up parts for old volvo cars from the early 1980's
if its an in-line 6-cylinder, its most likely a volvo only motor. again, old volvo cars
if its a V8, it will be a GM based motor for 1983. any place that sells pars.
however if you need a rebuild, you need to fully inspect what you have, fully machine everything, then buy parts. your local machine shop will help you there. Never buy parts before fully machining or you spend twice as much in parts as pistons and rings are not returnable
As Ted stated, post pictures of what you have. there will also be a decal on top the motor such as AQ120 or AQ205. this will identify what you have as well.