bamamopar
Well-Known Member
This maybe a dumb question. But can you use mopar roller lifts with a aftermarket roller cam?
roller cam question
- Thread starter bamamopar
- Start date
-
Yes. As long as you are using a Magnum block and the roller camshaft is the Magnum style cam.
67Dart273
Well-Known Member
How bout the later "roller LA" block?
bamamopar
Well-Known Member
I know you can take a roller LA block and put non roller lifters in it and have no problems. That's why I was wondering.
txstang84
Well-Known Member
The small amount of research I did shows the roller lifter part numbers (replacements) are the same for both LA rollers and magnums...
Yes ^^^^^ Long as it's a roller block. Keep in mind, the Magnum camshafts MAY have a different base circle since the valve train is different. This might mean a different length pushrod. Cheap enough to remedy.
txstang84
Well-Known Member
True...if I were still in Texas, I could go out in my garage and measure them as I have one of each still in boxes, as I intended to send one or both to Oregon for a regrind in my 5.2. 318willrun could probably shed some light on that one since he is planning to run an LA roller cam in his magnum block.
360duster
Well-Known Member
i have a LA roller cam block, from 91 i think.....i use the stock roller lifters with a comp cam (XR286HR10) and custom pushrods. Absolutely no trouble, working fine!
Michael
Michael
^^^^ see RRR last post ^^^^ I myself am about to put a factory stock LA roller cam from a 89 360 into a '94 318 magnum (so I can run a mechanical fuel pump). I was hoping to use the stock magnum push rods. Anyone know for sure on this swap (done it, no guessing)?????
txstang84
Well-Known Member
Ahh, speak of the devil and he shall arrive... ;)
As far as the pushrod length, I'm curious on this one as well. You're running mag heads, right?
Infecteddog
Well-Known Member
Nope. Not even sure that an '89 360 would have a long snout cam.
1985-up 318s (all) were roller blocks- many came with flat tappet cams. I had a late '84 build 318 with 302s, roller cam spider bosses tapped, but it had a flat tappet cam. Cop cars from '85-'89 and trucks '85-'87 were the same way.
TBI trucks had roller motors with roller lifters. That's '88 for 318s, '89 for 360s. 360s prior to 1989 did not have roller cam spider bosses. All Magnums were roller cams.
Magnums and pre-Mag roller blocks can use flat tappets. HOWEVER- without the spider provisions you're in a bit of a mess on how you're going to keep your lifters covered and you as far as I know cannot use the stock roller lifters on flat tappet blocks. It seems as though if you're going to use a pre-roller block you need aftermarket lifters.
sledger46
Well-Known Member
The cam will work with the right front cover to allow the use of the mechanical fuel pump. I had Comp Cams grind me a roller cam on an LA blank to install in a Magnum block, but the short block turned out to be toast. The cam ended up in my old LA block with aftermarket 'linked" roller lifters. For this reason I can't provide the answer for the pushrod length based on experience, but I believe the stock Magnum pushrods would work. I don't think there is any difference in the base circle on LA versus Magnum cams. If they had changed the base circle, why would they have to cast taller lifter bores in the roller blocks? When I was swapping in longer pushrods to come up with the .080 of pre-load my roller lifter required, I came across a company closing out pushrods for $29 a set or less.
As long as you are all stock on the Magnum (deck, heads, head gaskets, roller lifters) you should be fine with the LA roller cam and the stock Magnum pushrods.
As long as you are all stock on the Magnum (deck, heads, head gaskets, roller lifters) you should be fine with the LA roller cam and the stock Magnum pushrods.
Yes, my 318 magnum has never been apart. I will only swap cams, intake, and oil pan. I will also install the LA timing cover/water pump/harmonic balancer and pulleys.
txstang84
Well-Known Member
Gotcha-is that 360 roller grind much different than the stock 5.2 magnum?
There seems to be so much controversy on lift and duration of this cam. They say a 318 mag cam is a little hotter than a 360 mag cam, but this is the LA 360 version. I can tell you this, though, that the LA has a 1.5 rocker ratio, and the magnum 1.6. This means whatever the lift is, I will gain approx. .030 more lift due to the rocker ratio.
txstang84
Well-Known Member
I never measured the 360 LA roller I had in the box...kinda wish I had now. I knew about the rocker ratio difference, hence part of the reason I'd asked. Honestly, knowing your character on here, I figured you'd already measured it to lay the issue (controversy you mentioned) to rest.
I just knew it wouldn't be over a .444 lift, so if it was at the "max" of the spectrum floating out there, the max I could get would be .474 with the rocker ratio assistance. I really believe it to be around a .429 max, and probably even a little less. I'm not expecting anything really over a .455 lift (rocker ratio included). So, I really had nothing to fear/or gain by spending any time on it. But RRR made me think and question the pushrods, however, I will know when I install it. As for my character, ironically, what makes me different than most on here is that I don't get caught up in paper specifics when it comes to engine performance. I take the info available, but value the "butt dyno" more than spreadsheets... LoL. The butt dyno has never lied to me.... and will always take it over the "law of paper".
-
