Quote Originally Posted by Geezer2
Need to build a 489" BB to produce 550HP, but, it must make enough vacuum to run my PB, Cruise, AC, and all the other "creature comforts" I like.

I'm thinking 10-1 compression with a hydraulic cam in the neighborhood of 236 @ .050 with .556 lift. I'll run an Edelbrock Performer RPM with an 850 Holley.

Headers with a 2 1/2" mandrel bent exhaust.

It will be backed up by a T-400 with a 3000 convertor (remember I put street miles on this thing) and a 3:70 Posi rear.

I'm hauling 4500 Lbs and I could use some cylinder head ideas.
What is your budget??
You did'nt say if you have an oval port intake or a rec. port intake.
I can tell you that you won't get it done with just a hyd. cam and stock heads.
If you go 049,781 heads with 2.19/1.88 valves with a bunch of port work and a hyd. roller cam with about the same 236 at .050 then it is possible.
For after-market heads in an oval I would run a well ported 270 oval cc Brodix Race-rite or a well ported 265 oval AFR head.
In rec. port either a 294 Brodix or a 305 AFR.