Stock 3.0 SC...do I need cams if I want PMO's?

[rennch]

Hi,

I'm looking to hot rod my 3.0 SC motor. I'm told Early “S” profile or GE 60 Cams, and 46 mm PMO's would make for a great, responsive motor. Do I need to do them at the same time, or can I do one then the other? Just curious.

Thanks!

[snbush67]

You can bolt on the carbs with stock cams no problem. Or you can run those cams with CIS, but I would opt for the carbs first then the cams.

[James Brown]

The CIS cams will work fine, but yes get some cams sometime, ignition works wonders also (a big recurve). wow factor- 10+ sound- 10+ fuel mileage- 4 butt dyno- 10+ wallet- empty!

stock 3.0 with crappy Zenith's, loved it!!

[rennch]

Ok, great. 46mm cool? PMO,or does any other company make them? Anything else I need to be concerned with?

[James Brown]

fax richard parr at pmo your order form and your concerns, he will call you back and chat at lengths, a real good guy.

[rennch]

Did you say "fax" him? Is he stuck in a 15 year time Warp?

[timmy2]

A Fax keeps the junk mail and casual questions to a minimum I would imagine. Less distractions in his shop.
Easier than saying serious inquiries only!


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[snbush67]

Just fax him, it is good to be in the PMO warp. He will call you and with expert advice and follow through.

[rennch]

Great...thanks all!

[NY65912]

No, but a pair of DC-40's is a lot of fun!

[rennch]

Mike, what are DC 40's? And...is there a consensus on where to get the cams?

[Josh D]

Originally Posted by emptyo

Mike, what are DC 40's? And...is there a consensus on where to get the cams?

Dougherty Racing Cams

Dougherty Racing Cams

I could be wrong, But I don't think you could run those cams with the stock CIS pistions. From what I've read, valve/piston interference would result due to the CIS piston shape and no valve reliefs.

Also, with the valve overlap, you'll want more compression, or it will be a dog on the bottom end.

[NY65912]

Yes, it's the start of the slippery slope. JE 10:5 to 1 CR pistons work very nice with 46mm PMO's. Add headers or SSI's and an M&K and enjoy.

[rennch]

Heh, I know. I think I'm going to go Carbs and S Cams to match my SSI's. That should be a good start.

[rennch]

Well, it's settled. I'm in the market for some 46's.

[faverymi]

I think the S cams won't clear the CIS pistons.

Check that before or it's not going to be a good surprise.

[wayner]

Well, it's settled. I'm in the market for some 46's.

You are buying carbs?

What kind of time warp are you in?

[jpnovak]

Michael,

Let's combine much of the information in one place.

You do not need the cams to run carbs. Webers/PMOs will run just fine on a stock internal CIS converted car. However, The cams will not take advantage of the power you can get by running carbs as a fuel system.

There are many great cams for the 3.0. However, you can not run most of these on stock pistons. The piston dome on a CIS car is too tall and the piston will hit the valve on the exhaust side. The cams are more fun because they open the valves further and keep them open longer.

If you want to run an S, -40 or -60 cam you will need new pistons or have large pockets cut into your existing pistons to clear the valve. As you can see this gets to be a slippery slope...

I would start by talking with Richard at PMO. He will set you straight on the carbs. Don't buy yet.

Second call is to a well known cam grinder. John Dougherty, (DR Cams), Elgin, Web-cam, Take your pick. Find a grind that will utilize the carbs ability to handle reversion but also work with the stock pistons.

Third call is back to Richard to tell him what cam you are using.

Don't forget to have your rocker shaft faces refinished to match the new cams. Better yet. Buy a second used set and have them matched.

Cams in a 3.0 make a huge difference. After you have your carbs and cams en route call up Barry Hershon and have your distributor recurved to match the new cams.

You will certainly be pleased.

[Jack Stands]

Rich Paar figured out years ago that the only way to get work done and not spend all day on the phone was to call people on his schedule.

Great guy and great products. It's worth sending the fax!

[rennch]

Thanks JPNovak, et al. Some really great advice for this Carb newbie. And @wayner, lol!
Touche sir...touche.