I have a combo that I think I want to run.. need some input and experiences or problems u have ahd.
I want to run a mopar performance 509 purpleshaft cam, with edelbrock alum heads.. with prw's 1.6 rooler rockers.. I am wondering what I should do to the bottom end... and also what spings I should use... any help would be great.. thanks

A steel crank, stock or aftermarket rods would be fine (you can even do with a cast crank but with so many steels out there why?), obviously aftermarket rods would be better but you should be fine with stock reconditioned, and a good set of forged pistons.

With open headers it will probably pull to about 6500 rpm. Probably in the 530-550 horse zone, it will run well. Alot of people will tell you stay away from the old DC509 and like it will be said theres better cams but it will make power. Maybe look at the .557 as an alternative without much downside for street manners but more power potential. With the 509 you'll probably want about 10-10.5 to 1 compression with the Eddy heads.

What do you want to do. Alot of people will probably come on and tell you that you need 12:1 compression, 4.10s, and 3500 stall for it and while it will perform better set up like this alot of 509 cams have been used on the street. Id look at other cams though simply because the Eddy heads would make more power with more lift. The DC cams are based more on racing with factory heads.

Stock crank, be it cast or forged will be fine. Go with reconditioned stock rods or something like 440source's el cheapo rods. For pistons I'd go with KB237's if you don't mind hyper pistons. Mill the deck a little and you'll get a zero deck quench engine with those e-rpm heads.

I would scrap that 509 cam in favor of either a comp XE-HL cam or a Lunati Voodoo if you want to stay hydraulic. If you don't mind going solid, Comp and Lunati have some very nice, proven offerings.

Run a new cam, the 509 is outdated. MP is prone to having soft lobe junk made anyway.

I just want to make some good streetable power without afecting drivability.. So I should ditch the 509... I was also thinking the comp cams XE284H as an option.. So its seems I'm on the right track.. thanks all...

the 509 isn't much of a street cam. It requires 3000+ stall, 3.91 gears or better, 10:1 or better, good flowing heads, headers and such to work. Otherwise it will be a DOG off the line.

John, you know how that goes... In any case, the original .509 is not a streetable cam for 75% of those that run it and actually get one installed where it's designed to be... (i think the lobes are fine.. if they could just get them in the right spot!!)

I'd use the Comp Magnum 292. It's quieter than the XE line, easier on springs, and will live a bit better on the street. If you have power brakes, the XE274H would be my first choice for you.

There is nothing wrong with the 509 or any of the old Mopar grinds.They work really well.

Are MP cams ground for the 904 lifter diameter?

It's the same company that gave us .904 diameter lifters to begin with. MOPAR

Yes, BUTTTT,
At over 240 degrees at 50 lift it is at least 0.040 short on lift compared to modern grinds. It is by no means taking advantage of the 0.904 lifter. Take a look at the Hughes cams for what can be done with the 0.904 lifter. Or the Comp XE HL series or the VooDoo cams which seem to have different lobes for Chrysler cams.

The other thing to do is GET RID OF THOSE HEAVY PISTONS! You are building an engine with high rev valvetrain and head capabilities, get the reciprocating mass down from 1100 grams with pin to around 750 grams with pin. That's 350 grams, about a pound. At the top of the stroke where acceleration is highest, you are looking at thousands of Gs. That one pound "weighs" thousands of pounds at that point.

R.