factory magnum 360 roller lifters

[supersonictoys]

Hello everyone, I am a new guy and this is my first post. I have a 72 scamp with a fairly mild , roller cam magnum 360 installed and I am about to pull it out and install a forged 4' stroker kit and some performer rpm aluminum heads and air gap manifold. I am setting the motor up at 10.5 to 1 one and am going to try and run it on premium pump fuel and throw a little nitrous at it. anyway, I am going to be installing a fairly serious cam and was wondering how the factory roller lifters will react to this. I have read somewhere that they are fairly heavy and also don't like to rev past 5000rpm but I have been shifting mine at 6k so far with no issues. guess Im curious if they will maybe pump up? or maybe they are they going to be a cam profile limiting factor in some way? has anyone used them in a fairly seriously built motor with good sized cam and how did they work out? will probably be shifting at around 6500 with my new motor but will have alot more cam and certainly more spring pressure from the edelbrock installed springs. while I am sure there are better available I am currently just about "spent out" and another $5-600 for lifters will put installation off for another month or so and well into the cold rainy season here. will these lifters work for me? below is the stuff my wife "does" know about because its in the house. the new in the crate TCI super street fighter 727 and billet 9 inch converter and new 8 3/4 posi with 391 gears and forged stroked complete rotating assembly that she "doesnt" know about are all locked in the trunk of the car, LOL. anyway thanks for any info.

 

[bayyum]

WELCOME TO FABO, and i like your collection of parts there LOL

 

[moper]

If you're running a serious cam, the Edelbrock springs will not be enough. If I understand right... You're spending at least $5K in parts alone, and you're concerned with buying good lifters? Is the rest of your investment worth spending another $550 on good lifters? Ive recently looked into these a little and the best I can see are the new ones from Bullet Cams. I forget the manufacturer... but they are supposed to work well up over 450lbs over the nose. They are brand new so no history yet, and the pricing wont be known until they are available some time in November but similar stuff are $500-$600/set.

 

[Petzschler]

Bullet is an UltraDyne Brand.
http://www.bulletcams.com/
they know there stuff thats for sure.

 

[dodgetkboy78]

Stock rod magnum to 6500 with NOS means...... BOOM.

Get rods too..........
make it oil better.

Serious motors need more than a pie of expensive parts.

 

[supersonictoys]

as I said above, "all forged rotating assembly". that includes forged steel 4340 crank, forged steel 4340 I beam rods and forged pistons. everything will be balanced of course and the block will be all studded and bored with torque plates. should be ok with a BIG shot of NOS I would think. on the edelbrock web site I think It said these springs were good up to .580 lift.

 

['64 Cuda]

I don't think the Eddy springs will work very well for what you have planned. There is a Hughes spring that will bolt straight on to the Eddy heads that costs a little over $100 IIRC. Don't have the part number handy because I'm just recovering from a MASSIVE hard drive crash, but I think it was the HUG 1111.

 

[rumblefish360]

Lets all step back a minute here and look at the meat and potato's of the post.

I have read somewhere that they are fairly heavy and also don't like to rev past 5000rpm but I have been shifting mine at 6k so far with no issues. guess Im curious if they will maybe pump up? or maybe they are they going to be a cam profile limiting factor in some way? has anyone used them in a fairly seriously built motor with good sized cam and how did they work out? will probably be shifting at around 6500 with my new motor but will have alot more cam and certainly more spring pressure from the edelbrock installed springs. while I am sure there are better available I am currently just about "spent out" and another $5-600 for lifters will put installation off for another month or so and well into the cold rainy season here. will these lifters work for me?

The issue with the stock Edelbrock springs is not an issue but is addressed, unclearly, but in a way I beileve he means to replace them since it says;

but will have alot more cam and certainly more spring pressure from the edelbrock installed springs.

It seems misworded.

He mentioned he's about spent out. No broke, just low on funds.

The real issue at hand is about the roller lifters. Can they handle an agresive cam profile and to what RPM are they OK to rev to?
This is the real question.

supersonictoys, I have read, I have not been there and done that, but have read the stock roller lifters are good to approx. 6500 rpm. This limit is due to the weight of the lifter. I have not read anything about the lifters being limited to any agressive rate cam. They just mentioned that it's weight is the issue.

For most cases, a stroker engine makes almost all it's power by 6000 - 6500 rpm unless it's built for racing. If it is a street engine and even with a aggressive roller lift, the peak power it makes is a combonation of the engines combo. Looking at all your parts and knowing this is a long 4 inch arm, the question to you is, what are the cam specs that are going to be used.

At 400+ inchs of engine with the 4 inch stroke, I'd bet your not going to make power past 6500 even if you get lighter lifters. The heads could use some port work in order to support the extra inchs unless the cam is mild....which by your statement, will not be.

OH, also, just because Edelbrock says the springs are good to .580 lift doesn't mean it is good for an aggressive cam with less leift. An aggressive rate cam will need more spring pressure. Just purchase the cam and lfters togther from the same manufacture or get there recomendation on what spring to use with the Edelbrock head.

 

[crackedback]

The stock 360 roller set up has been spun to 7000 if preloaded right.

Most of the time they give up around 6200-6500 just like the expensive ones.

I've got two engines that will make in excess of 500 hp and turning in the 6500 range with stock rollers.

 

[340sFastback]

My cam is .591"/.548" lift intake/exhaust and I had to upgrade the Edelbrock springs and go with 10 degree retainers and locks. The stock Edelbrock retainers and locks are pretty flimsy pieces compared with the 10 degree Crane parts I used.

 

[pishta]

The stock lifters will uncover an oil control port at high lift, most "stock" MAgnum roller cams are ground DOWN at the base circle to keep the lifted roller under a finite max lift height. The difference is taken up with a longer pushrod. Look into this before you use the stock rollers. This was on another post on what the max lift these stock rollers could do.