Hi all i just bought a 1988 34' scarab III with twin 454 330hp, and when i was crawing around them today I noticed that the headers did not look stock and they say "GL Offshore" on the sides of them, can someone please tell me if they would be stock or not. Thanks for any feedback!

U mean GIL offshore ?!

And no they are not stock but where a merc replacement back then !!

But good stuff,,usually hold up a long time !!

Could be GLM also.

They are manifolds and like the guys said either GIL or GLM. Eitherway they are decent exhasut for that application.

Ok guys thanks for the feedback. Dose anyone know the HP gains i would see from them over stock? I am running 23 pitch quicksilver props which everyone is sayin is great for my boat but at WOT the motors spin to 5000 rpm's which is to high for my liking so im thinkin of a 4 blade 22 pitch.

The gains with a stock engine unfortuately would be none with my experiences however down the road if you decide to do some engine upgrades (450HP or so)they will help then and will perform better than the stock manifolds. At least the gils will anyway.