Awesome! What they going on?

Do they do the work themselves or sublet ? Either way, get references or reviews on whomever does the work, even if them. And yeh, make sure they know marine...quiz them on what margins and guide clearances they use. Don't just go by 'Yes, we do." Might as well get all the installed (not on paper) spring psi info too. This stuff can be important so it doesn't bight you in the azz.

They are going on a pair of 575's in my Velocity that I tore down for no good reason. They looked great inside, but the boat was new to me and I wanted to know what I had. In the end I know I will have bigger cams, bigger blowers and better heads and fresh bottom ends.

I was going with Dart IE 308's, but even through Atech, I couldn't beat the price on these heads. My last personal motor had a set of 308 Iron Eagles worked over by Jim Valako and they made killer power. These will have boost to help thing along though.

What heads are you not using??(what was on the motors)?

Im assuming the stock 575 GM heads.

You're gonna make quite a bit more power than the stock 575!

This guy is on it! LOL.
Yeah Phragle they are stock 575 heads. The heads are in nice shape but I tend to get caught up in that "for just a little bit more money I could...(insert whatever part or upgrade here)"
I also seem to go well over budget on any build I do for myself...I think the two things might be related. LOL

Very true. Part of why I bought them bare and putting together with my own parts. BUT, if its worth it to buy it all as a package, then I'd say buy it that way, and then go thru and check guides and valve job, etc. That goes for any head imo. AFR's heads drop shipped with an inconel valve upgrade, do not come with "special" marine seat width valve jobs for forced induction marine, or special guide clearances. They are the same head, that you get if you were ordering them for a Chevelle street build, just with an inconel exhaust valve, unless of course you buy them from Teague, who machines them in house, or someone like that. If they are coming from AFR's factory, than it is what it is.

Engine quest's recommendation for guide clearances on those heads is .0015"-.0016", exhaust .002"-.0025", and they are marketed for marine engines and big power truck puller applications.

I totally understand this! Story of my life ha-ha.

So much for wondering if you had a decent set of older alum heads you werent going to use for sale cheap.... lol