haven't had many questions in a couple of years because this forum usaully answers them all for me.Great Job. I,ve got a 2003 volvo 5.0 220 h.p. 2 barrel holley carburated motor in my glastron. From all the info. around it seems it has the Vortec heads.The intake looks exactly like Edelbroc's Performer R.P.M.high rise 4- barrel manifold. Does anyone know if volvo uses a 4-barrel to 2- barrel carb plate adapter for this setup? I'd like to go with a holley 4-barrel setup and would like to know if that's what's hiding under my 2-barrel. P.S.I could take it apart and see for myself, but anyones info would be more appreciated ;thanksVETTMAN