Is anyone running an aftermarket cam?

[BrianC]

I am looking for an aftermarket cam for my 4.0L. Looking for a little more power with the rebuild. I don't want to build a stroker. Anyone have any suggestions?

BrianC

 

[rsalemi]

The strokers Group on Yahoo has listings

[Most every cam manufacturer has several cams for the 4.0 ranging from low RPM - more torque than stock to fairly wild with more horsepower than stock. I have the Comp Cams 234-4 in my stroker and beleive it would work well in a 4.0 (requires upgraded valve springs, retainers, etc.) MOPAR Performance has 3 cams listed.

 

[CRASH]

[Most every cam manufacturer has several cams for the 4.0 ranging from low RPM - more torque than stock to fairly wild with more horsepower than stock. I have the Comp Cams 234-4 in my stroker and beleive it would work well in a 4.0 (requires upgraded valve springs, retainers, etc.) MOPAR Performance has 3 cams listed.

Isky has a couple of cams as well, they are very good to deal with. I got their 133125/26 grind for my stroker, but it would be pretty good for a hotter 4.0 as well.

Still requires Mopar 5.9 Magnum springs/retainers, though, because it is .450/.465 lift.

I believe .450 lift is max for OEM valve springs.

CRASH

 

[Lincoln]

I'm either running the with just a ported and polished stock head:
http://www.cranecams.com/?show=brow...-258 C.I.&partNumber=753941&partType=camshaft

or

http://www.cranecams.com/?show=brow...-258 C.I.&partNumber=753901&partType=camshaft

Am I reading the specs correctly? It looks like both of those have more lift than the stock springs are supposed to take. Hmmm.

 

[cherokeekid]

on the same subject, is there a cross reference for some higher ratio rockers? I'm guessing that the 4.o uses the same as another vehicle. (yes I am aware of the waaaaayyy tooo expensive roller rockers)

 

[rsalemi]

Stock and Roller rockers are 1.6 ratio

on the same subject, is there a cross reference for some higher ratio rockers? I'm guessing that the 4.o uses the same as another vehicle. (yes I am aware of the waaaaayyy tooo expensive roller rockers)

 

[rsalemi]

MOPAR says .450 max with stock springs

Yes both of those cams would require the Mopar Magnum spring and retainer - or a valve spring other than stock.

 

[cherokeekid]

I realize the ration is the same, I was just curious if someone had found an inexpensive (like off a 318 or something) say 1.7 rocker.

 

[BrianC]

Also along these lines,,,Did you need to go with longer pushrods? Accurate Power's website says you need .030" longer pushrods for aftermarket cams.

Brian

 

[SeanP]

I realize the ration is the same, I was just curious if someone had found an inexpensive (like off a 318 or something) say 1.7 rocker.

I haven't seen any, but most of the folks I know are looking for torque and not HP so would stick with the 1.5

SeanP

 

[CRASH]

Also along these lines,,,Did you need to go with longer pushrods? Accurate Power's website says you need .030" longer pushrods for aftermarket cams.

Brian

That doesn't make any sense, especially since most of us building strokers are taking at least .010 off of the head and another .010 off of the block. This is likely within the range of a stock pushrod, but if anything, you would want a SHORTER pushrod to compensate for the machine work. I have a set of shims here from Jegs that come with various thicknesses to shim up Mopar rocker arm girdles.

CRASH