Just curious here, why are you going with roller tip rocker arms rather than ductile iron? Wouldn't eliminating that be beneficial in reducing valvetrain mass and complexity? Also wouldn't that reduce costs and potential points of failure for what is going to be a street motor?
Serious 340 build into 361 HiRPM Screamer
- Thread starter RAMM
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Just curious here, why are you going with roller tip rocker arms rather than ductile iron? Wouldn't eliminating that be beneficial in reducing valvetrain mass and complexity? Also wouldn't that reduce costs and potential points of failure for what is going to be a street motor?
Who makes ductile rocker arms? Thanks know Crane (IIRC) did but not anymore. There were priced right.
I don’t see a complexity issue. I see it the same really. The only other possible point of a failure would be the roller tip. It takes a lot of slamming from excessive lash to break a roller tip axle or otherwise spread the rocker arm tip out enough for a problem.
I don’t see a complexity issue. I see it the same really. The only other possible point of a failure would be the roller tip. It takes a lot of slamming from excessive lash to break a roller tip axle or otherwise spread the rocker arm tip out enough for a problem.
Awesome! Thanks.
67autocross
A new iron curtain drawn across the 49th parallel
I should run them on my 416 build…
512Stroker
We are all here because we are not all there.
That right there is why I am going to remove the Comp Retro Hyd rollers out of my 340 this winter. Just praying that they last that long.
Wish me luck.
PRH
Well-Known Member
Which shaft mounted ductile iron rockers fit the magnum heads?
Are they available in the desired 1.7 and 1.8 ratios too?
Are they available in the desired 1.7 and 1.8 ratios too?
not impressed , now looking at stealing my old 340 back and using the ols style adjustable rockers and non roller lifters
I never seen mechanical rockers but rollers.
*I Think* I seen them in, ether/or/both/all of them from Jesel, TD & Crower. It was a high end rocker.
Again! *I Think*!
Not in ductile mechanical, but,
Again I start with *I Think* I seen 1.7. IIRC, *I Think* I seen companies like Comp (but don’t quite me as fact) having a 1.7 rocker. I don’t remember seeing a 1.8 being produced, but if it is possible, it’s only (lots-O-) money the customer has to cough up.
(Sometimes you see so much on the net advertised and what’s new in days, it gets confusing.
K.O. SWINGER
Meeting in the alley since 1976
Horsepower has no effect on rocker life. I truly believe hydraulic roller rockers have their place but not for a motor that see north of 7,000 on a regular basis. A quality hydraulic roller on a stroker that very seldom sees 6,000 RPMs is a whole different animal.lmo
RAMM
Well-Known Member
So I've taken a full time position with an awesome pipeline company and haven't been getting a lot of time in at the shop but this build is still going forward but with a bit of a twist on the induction side. Since using a pair of inline 600 Holly's on a 572 Hemi I've decided to go with a tunnel ram with a custom welded and machine top to position the aforementioned Holly's on this build. I love tunnel rams and will test with the X-celerator to see how this T-Ram stacks up- should be very interesting. J.Rob
P.S. I am still looking for some genuine TooWoomba cast EQ CH318B's
P.S. I am still looking for some genuine TooWoomba cast EQ CH318B's
RAMM
Well-Known Member
Gonna weld on a 3/8" thick plate on top of this plenum. This was a hideous single four at one time. J.Rob
what you replacing them with ? i need lifters as well not going to use the hughes roller lifters I have EVEN THOUGH THEY HAVE NOT GONE BAD YET
512Stroker
We are all here because we are not all there.
first off good luck with the new job. Second where did you work before, did you have your own shop?
RAMM
Well-Known Member
Thankyou and yes I was and am on a part time basis running my own shop since 2019. J.Rob
Pretty hard to turn down a good paying job with what should be excellent benefits. Like I said good luck.
ingenuity and out of the box thinking at its best
512Stroker
We are all here because we are not all there.
Engines out and top end is apart and off the engine, cam is fine, so the solid rollers are going in.
OBTW you dont have to pull the heads to get the Comp lifters out, at least not with factory X heads.
Edelbrock heads?
512Stroker
We are all here because we are not all there.
Cant help ya, I have no experience
I was told by many people that you must pull the heads to get the tall hyd rollers out. I was able to pull them all out of my LA 340 with the X heads in place.
I did pull the heads to have them ported but thats a different story.
Sorry to hijack the thread
Me bad
On my son's Edelbrock LA heads, on a magnum block, we had to clearance the heads so that the stock magnum roller lifters could go in/ out. We checked this before assembling the motor, just in case he ever needs to change one.
We had milled .030 off of his block, so that may have affected it some.
It was minor clearancing. I actually took pictures, but I don't know if I ever posted them here. The laptop they were on crashed, so I no longer have them.
I have no idea if aftermarket hyd. rollers with the link bars will clear or not.
My Crane solid rollers clear by a mile.
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7,000-7,500 is pretty normal for a 340. Shoot for 8,000! lol
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