I was wondering what cams you guys run in your trucks. I've been thinking about buying a COMP cams High Energy 268H to make the idle a little more noticable.

And can someone explain to me what exactly an RV style cam is ? whats so special about an RV style cam?

 

check the sig

 

A 268 in a computer controlled EFI probably won't run at all. The bigger cams like that are generally for carbed applications.

 

As far as I know a "RV cam" is basically a cam designed for high torque at low RPM's, also know as Towing cam...

 

Alright, Thanks for the info

 

The 268 is definitely on the ragged edge of working with the computer since it has 24 degrees of overlap. You can usually get away with 25 degrees of over lap, but it's uncharted territory with the 300. In a big heavy van I would probably avoid any of the Comp profiles because they are all ground on a 110 LSA. IIRC, the Crane truck power is on a 114 LSA and has only 19 degrees of overlap. It has been proven to work well with the computer. There are several companies out there that make cams for the 300, you should check out their grinds and see what's best for your application. Chances are good that you won't get the sound you're looking for in a streetable cam.

 

Well i only want a cam with a slightly noticeable idle. I see Crane Cams offers one: http://www.cranecams.com/?show=brows...tType=camshaft
But im not sure this will work.

 

With a basic rpm range of 3000-6500 and 10.0-11.5 compression ratio advised, I would say that it won't work for your engine.
Brett

 

alright, thanks

 

Unless you really like mechanical valve trains over hydraulic I won't select that one. The 503901 (which is the same as the 503905 that optikal illushun sugested) the most commonly suggested Crane cam for our EFI 300's. Unless you have to pass a SMOG sniffer it's the best steetable cam from Cranes offerings.

 

That cam won't even pretend to be streetable, especially with EFI. It's got around 85 degrees of overlap and probably won't pull 5"Hg vacuum at idle. The intake closing point will also make it feel like it's running on about 5:1 compression at the low end. The mechanical lifters will require hundreds of dollars in valvetrain modificaitons just to get running, plus you'll have to pull the upper intake off every few months to adjust the valves.

[flame suit]Regarding "RV cams", that is a very outdated term that a lot of people use when they have no idea what's in their engine. Decades ago there were typically only 3 or 4 cams available for an engine from each manufacturer, so they were easy to keep up with. They typically fell into groups like stock, towing, RV, 3/4 race and full race because every manufacturer used similar specs. That is not the case anymore, especially now that we have small blocks with 460 cubic inches. A full race cam for a 289 would run like an RV cam in a 460. The fastest way to get laughed at when someone asked about your truck is to say it has an RV cam in it. If you don't know the specs, keep your mouth shut or at least make up something better than "RV cam". It is better to remain silent and be thought a fool than to open your mouth and remove all doubt.[/flame suit]

Crower and Erson are the only two cam grinders I can think of that still use this antiquated terminology, and I notice neither of them are very popular anymore. Ironically, Crower has some grinds that should work excellently with an EFI 300 (the 252HDP or 260HDP should work excellently for you). Unfortunately, you can look at the specs on the Erson grinds and tell that they were designed 30 years ago and they've been asleep ever since.

 

I looked at erson cams and yes you defintatlly can tell the specs were designed 30 years ago. what would be required to install in a Crower 252HDP or 260 HDP? what benefits would be gained from this? How much would it cost? is there anything i should replace if i install this cam? Also could I convert the timing gears to a timing chain?

Thanks for the info on "RV" cams XD. Yeah i remember reading ads in magazines that say 3/4 race cam, full race cam, etc etc.

Thanks for being so helpful!

 

Too my knowledge, there are no time chain sets available for the 300. To that end cloyes makes an all metal gear set that has 3 different key ways (4* retard, 0, 4* advance) that is some times listed a adjustable. If found it in Jegs catalog for around $75.

 

Thanks, I really dont like the idea of the composite timing gears going at anytime. much apreiciated