Adjustable rocker arms

[jrapp13]

Would the Cast Iron Ductile Mechanical Rocker Arm Package from Mopar Performance(P4120974) be acceptable to use with a hydraulic camshaft on a street-driven 440? Hughes Engines advises using an adjustable valvetrain beyond a certain amount of lift and i was wondering if this would work.

[DartGT66]

Yes, they would. And they are more rigid, and last longer than the aluminum rollers. In hte past, those "max wedge" rockers were all that was available. They work great back then, they work great now, even if they may not be the "hottest looking" part on the market. Luckily, the valvecovers cover tehm most of the time, so no one will never know. In a regular street engine, I would avoid the use of aluminum parts in highly stressed areas, unless it's absolutely necessary.

[valiant64]

I just bought a set of those MP (Crane) rockers for my 440. I almost bought some aluminum rockers instead, but decided for the amount of street use my car sees that the iron rockers were a better investment for longevity.

[aarracer]

jrapp

Check out "Rockerarm specialists.com" (or something like that)and you may be able to get an iron set that are bushed for the same price.

[owatajrkiam]

A bushed rocker is definately the way to go!!!

Glen

[utah]

has anyone used 440 source roller rockers or any other 440 source parts

[rrunnertexas]

jrapp13,

I use the tried and true Crane ductile iron adjustable rockers on my 383.
These are great parts that seem to be very durable. I would purchase them again if I had to.

My first engine combo used a hydraulic Crane cam and I was able to adjust for about .010" lash with the hydraulic lifters.
My second engine combo (currently in use) uses a Comp Cams solid cam with the same Crane rockers as the first. Of course, I had to change pushrods.

So, to answer your question, the MP rockers or the Crane ductile iron rockers are a great choice over the stock stamped rockers. I believe Crane is the maker of the MP parts.

Hope this helps.

[MOhorsePAR]

Rocker Arm Specialist are the way to go.

[kamstra]

Another vote for ductile iron. I have them on my 440 and 408 small block.

[Jack_440 Savoy]

Just wondering, If you have adjustable rockers why bother with hydraulic lifters ???

[thatwasfunny]

Originally Posted by Jack_440 Savoy

Just wondering, If you have adjustable rockers why bother with hydraulic lifters ???

I guess some people wanna build hot rods/muscle cars with BB, headers, flow masters, ect but complain about the noise of the solid or that they have to adjust the rockers every 6 months, if that.
Well what do you think is happening with your adj & hyd cam ?
Do you actually think your pre load stays the same?
Sorry to burst your bubble!
Solids and increased rocker arm ratios are the next best thing to a roller cam.

[valiant64]

A hydraulic cam has its rpm limitations by nature due to the hydraulic lifters tendency to pump up @ a given rpm. Adjustable rockers in conjunction w/ a hyd cam & anti pump up lifters will allow the engine to rev a bit more. Even the stock non-adjustable valve train will allow sufficient rpm's for most street engines. For someone to see the need to rev a street driven 440 beyond 6k to make sufficient power needs to reconsider their combo & intentions with the vehicle. Solid lifter & roller cams have their place, but for most street driven cars a good hydraulic cam works just fine. Many 500+ hp 440 engines have been built with hyd cams without the need for a solid/roller cam or ridiculous rpm's for street usage.

[thatwasfunny]

Slant 6=solid cam, what did that motor top out at?
Poly 318=solid cam.
LA 273=solid cam.
Old Hemis=solid cam.
Solids have faster ramp speed than hyd and price is almost the same.
Solid doesn't automatically= 6000+RPM, the grind does.
When comparing similar grinds the solid will idle better and give you a broader,[wider power band], range of power.
Heck, you can put solid lifters on a hyd stick if you wanted.
Really, do what ever you want, but accept the facts.

[jrapp13]

Originally Posted by Jack_440 Savoy

Just wondering, If you have adjustable rockers why bother with hydraulic lifters ???

I assume to assure correct ratio and strength compared to stamped rockers and for less maintenance.

[nhdriver]

One more thing, to use the ductile iron adjustable rockers you must get a set of pushrods to go with them. They have a "cup" end that recieves the "ball" end on the adjustment screw.