twayne24365
Well-Known Member
got the hold downs milled to center the rockers, checked the sweep pattern, looks pretty sweet!
I would agree. A good sweep pattern should be 1/3 of that. It's nice that it's centered, but definitely too wide. The OP should be talking to Mike at B3.Looks too wide to me.
got the hold downs milled to center the rockers, checked the sweep pattern, looks pretty sweet!
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In what universe, Andy? That's going to be destructive.Looks nice. What heads are those?
Fwiw, the pattern probably won't get any narrower at .670", and if it does, it won't be centered anymore. I know you're proud of getting that sweep centered, but what you have is not good geometry. Hopefully, it doesn't give you problems, because no one is going to pay for fixing it besides you.That's about .850 lift, just had a test spring on one valve and got the rockers set up, just pushed the rocker with my hand till it touched the seal a few times,
Cam is .670 so when I get pushrods mocked up I will report back with sweep pattern with actual lift
got the hold downs milled to center the rockers, checked the sweep pattern, looks pretty sweet!
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I have hughs 1/6 rockers on my 505, the sweep is about maybe a little less than 1/2 of the orig. posters, dead center, w/ a .628 lift . I didn`t have to do any machine work to get them there, no shims or anything .
Probably not. 99% chance not.The poster said he pushed the valve open clear to the valve seal, that would make his sweep look worse than at max lift.
Probably not. 99% chance not.
I’m sure there is a slight edge in power/durability getting the geometry absolutely perfect. But I’m not going for prostock performance, the 383 in my Dart has been in 2 cars and tortured since 2011 with the same heads a ductile rockers... the sweep pattern on those guys about covers the entire valve head and it’s a mopar 557 solid cam. I spin it to 6800 every time I drive it and it shows no signs of any problems.
If I'm going for the best geometry, I go with my custom T&Ds. If I'm working with Hughes, I like to convert them to a cup adjuster, and then relocate the shafts with SPACERS, not shims. Shims break things.What's your take on the Hughes rockers? Your relocation shims needed? I'm running a .564" lift cam w/ Stealth heads, 1.5's but I'm waiting on other parts before I get into valvetrain geometry.
Maybe you'll get lucky, maybe you won't. Maybe the next guy will or won't either. It's a decision each individual has to be comfortable with.I’m sure there is a slight edge in power/durability getting the geometry absolutely perfect. But I’m not going for prostock performance, the 383 in my Dart has been in 2 cars and tortured since 2011 with the same heads a ductile rockers... the sweep pattern on those guys about covers the entire valve head and it’s a mopar 557 solid cam. I spin it to 6800 every time I drive it and it shows no signs of any problems.
Maybe you'll get lucky, maybe you won't. Maybe the next guy will or won't either. It's a decision each individual has to be comfortable with.
I'm currently relocating studs on a Chevy, because the geometry isn't right on those either. Yet a lot of guys bolt the heads on with a lousy centered pattern that is way wider than it should be. I don't let that go out the door.
This is with .500" lift. It isn't perfectly centered, but I moved the stud as far as physically possible with the available inserts. It needed .100", I got .080". Btw, this is for my brother-in-law, so I'm not making any money from it, and I still wouldn't let it go out the door with poor geometry.View attachment 1715184409 View attachment 1715184410