71 Dart get 408/ Trick Flow Heads....
- Thread starter 70aarcuda
- Start date
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I just finished sealing up my intake and I’m also running Howard’s EDM’s .....hmmm, great just what I needed to read.
Brian Hafliger
Well-Known Member
Tony I'm just curious, but what oil do you use for cam break-in? Outer springs only? RPM during break-in?
I had a set of Comp EDM lifters years ago that had not been properly hardened after the EDM process wipe out a cam but never have seen this type of failure! That is UGLY!!
I had a set of Comp EDM lifters years ago that had not been properly hardened after the EDM process wipe out a cam but never have seen this type of failure! That is UGLY!!
PRH
Well-Known Member
I’m not an advocate of “budget oriented” rockers for any build, so whatever I would have used for rockers on a SFT cam myself, would be suitable (imo) for a mild easy-on-parts SR cam.
So, that wouldn’t be an added expense if I were building it.
Something along the lines of the old Crane golds are fine for that type of build.
lead69
hopeless car junkie
Carnage
Also you can see some "chipping" at the edges of the lifter base.
Also you can see some "chipping" at the edges of the lifter base.
B3422w5
Well-Known Member
Howards grinds all the Hughes cams. If you look at a Howards grind that has the super fast rates the Hughes stuff does, they give you some warnings about them
I have a Howards solid that isn't one of the fast rate cams and it makes excellent power
PRH
Well-Known Member
I’m pretty surprised at how thin the bottom of that lifter is.
Look how cupped this one is...... still no big hole in it:
I’d be tempted to take a cutoff wheel to one of the remaining “good ones” to see how thick it is to start with.
Look how cupped this one is...... still no big hole in it:
I’d be tempted to take a cutoff wheel to one of the remaining “good ones” to see how thick it is to start with.
lead69
hopeless car junkie
PRH
Well-Known Member
I don’t recall if you were part of the thread from last year where someone had a Hughes cam that was absolutely ground wrong(way too much lobe taper, and all lobes tapered in the same direction), and they did nothing for that customer.
Frankly, it’s hard to imagine them handling this one any differently.
lead69
hopeless car junkie
I built a 360 around the same time frame with the howards edm lifters and "so far" it seems to be fine. I will be interested to ask him what they find at valve adjustment time.
PRH
Well-Known Member
I don’t know how they do it, but I would have thought they were just AMC solid lifters.
I emailed Mike Jones last year when I was inquiring about his required EDM lifters when buying one of his cams, and if the Howard’s I already had would be ok to use. He said yes, same lifter as he uses, but his had a slightly larger hole on the face. Don’t recall who actually makes them though.
I 'd check the lifter bore geometry, can be a problem with an aggressive lobe.
B3422w5
Well-Known Member
have had a 260/264 Howards flat tappet in use for 4 seasons with edm lifters, its now in my new 418. Zero issues, lash stays constant
PRH
Well-Known Member
Comp 2901-16
Was run for a full summer of street/strip use.
It was run on a fast rate .904 cam in an unbushed(uncorrected) block.
It was discovered afterward that the heads did not have the step removed for the inner spring(so, preloaded an extra .100”), and the motor was being run without high zinc oil or any zinc additive.
The replacement cam was done using a little slower lobes, the spring situation was rectified, and the proper oil is now being used.
Two seasons on it so far(along with some new “bests”) with no issues.
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lead69
hopeless car junkie
That's the hardest thing about this hobby is the inconsistency. There are also quite a few guys on the forum successfully running hughes grinds but no matter the company or part all it takes is one bad day in manufacturing and some customer is going to get screwed.
PRH
Well-Known Member
Back in the mid-80’s, when I didn’t really know anything about anything.......one summer I put 5 cams in my 440 trying different stuff at the track.
I did know you weren’t supposed to run used lifters on a new cam....... but in my mind one or two trips to the track wasn’t “used” enough to not be able to use them on another cam.
This was back when all oil was pretty good, and there wasn’t much talk about soft springing for break in.
So...... I ran all the cams(4 new ones, and one of them twice) on the same set of lifters, no special oil, and no soft springing anything.
Zero problems.
A few years later when I was working at a machine shop I went through the heads.
The springs were set up at 155 on the seat and well over 400 open.
Those were the good old days when cams going flat was a fairly uncommon thing.
I did know you weren’t supposed to run used lifters on a new cam....... but in my mind one or two trips to the track wasn’t “used” enough to not be able to use them on another cam.
This was back when all oil was pretty good, and there wasn’t much talk about soft springing for break in.
So...... I ran all the cams(4 new ones, and one of them twice) on the same set of lifters, no special oil, and no soft springing anything.
Zero problems.
A few years later when I was working at a machine shop I went through the heads.
The springs were set up at 155 on the seat and well over 400 open.
Those were the good old days when cams going flat was a fairly uncommon thing.
Brian...I coat the cam with the paste that come with the camshaft.....after I do the initial lash settings...and before I bolt the intake on...I go over the camshaft again with paste....I have been using Lucas 10w-30 Hot rod oil
The engines fire right up...and I set the timing right of way to 32 degrees.....rpm...varies 2000 to 2800........with EDM lifter....I should not be being worried about the cam getting oiled...LOL
I dont remove the inner spring...but i have been doing this for upteen years and never removed the inner spring...last summer I put a MP 590 in a 360 with the SM heads you did for me....broke in the same way...No problems....as I said before I removed a Hughes 5460 cam that went flat during break in....put an old MP571 oval track cam in it.....it is running just fine...and faster then the Hughes cam.....
Tonya and i got the engine out.....moved over the needed parts onto the 360 with SM heads.....and stuff it and the 904 with low gear set back in the car....Should have it running Monday.....it has a MP590 and it ran pretty good last summer..
Then i will get that other engine torn apart
Then i will get that other engine torn apart
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PRH
Well-Known Member
MP 590 cam = not fast rate 
About the only time I ever sell a fast rate .904 cam is when the customer specifically asks for one.
About the only time I ever sell a fast rate .904 cam is when the customer specifically asks for one.
PRH
Well-Known Member
That’s what I was getting at
It’s a pretty good overall bracket cam really.
I still have 4 of them in boxes...lol......
Last one i bought was 125 dollars with lifters....
We will get it fixed.....We have tickets for the March meet in Bakersfield that was postpone to Memorial Day Weekend....so she said that we should probably use the this 360 engine at that race since it was there last October....I agreed
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