high HP I mean 7-750...

just opinion that's all, I figure if you have a 540 go as big as you can without sacrificing power, then you don't have to upgrade again if you decide blowers...

you looking at another set of engines then? not Edelbrock ones?

A decent 310 head like the Dart, Canfield, AFR 305, etc. will easily support upper 700hp levels. I've made over 800 with Canfield 310's on a 12.5:1 467 and we have a really mild 710hp pump gas 509 combination using them as well. Now, neither of these would be considered "offshore, out drive, wet exhaust" friendly but the point is the heads will support the HP. I'd say 700hp na with 310's on a 540 built for an off shore deal wouldn't/shouldn't be difficult if all the supporting cast members were there.

Can you give a list of parts needed to go with these heads and my gen 5 502 blocks to make that hp on pump gas? It will be running dry exhaust.

I agree. And its been done many times, using the dart pro 1's.

Also, my general opinion, is anyone wanting 700 plus hp, shouldnt be running wet exhaust anyway. Its pretty simple these days, to buy some stainless tubing, and have your tail pipes converted to dry tail pipes. We have plenty of muffler options that can work with that of noise is a concern.

You probably know the Gen5 blocks have water passage alignment issues with Mk4/GenVI heads but given that, our build basically consists of a good 10:1 rotating assy (we use Scat cranks, Eagle or Molnar rods, Mahle pistons and rings), Canfield 310 heads (unported w/ CNC chamber), Victor Jr intake (unported w/ 1" open spacer), AED 850 Holley and a custom hyd roller with Morel lifters, Rollmaster billet/nitrided timing set and smith brothers pushrods. We have been using Crane gold rockers exclusively but they are no longer available so we're in the middle of trying to choose a new "go to" rocker. The heads get REV severe duty valves, ARP studs, springs selected for the cam, American made 4140 10* locks, retainers, spring locators and Jomar stud girdle. The pan would be whatever was appropriate for the application but we use Stefs almost exclusively. Balancer we use is Romac but can be upgraded to ATI, and you can upgrade to things like crank trigger, port work, shaft rockers, wet sump, etc. but the basic un-ported, out of the box combination makes 709 hp@ 6300 and 679 tq @ 4800 on pump 93 octane. The cam is 240/248 .665/.643 on a 107. I can post a dyno sheet if you like. Your Dart heads should be comparable. Cam might just be a little different based on flow numbers.

Scott, did crane stop making the gold rockers ?

I'm not sure what's going on. From what I'm told the next shipment of Crane rockers in "on the ship"... :(
All I know is right now, no one has any.

[QUOTE=horsepower1;4375603]You probably know the Gen5 blocks have water passage alignment issues with Mk4/GenVI heads

So, will these heads not work on the gen 5 block, or what can be done to make it right if anything? Is this parts list for the 509 or the 540 or is it the same for both?

Yes on the dyno sheet if you dont mind?