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Old 09-07-2008, 05:28 AM   #1
rude 72
 
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Default problems with dart heads

hi. i have a 72 nova 355 dart iron eagles , 2.08 1.6 49cc . i purchased new 3/8 push rods installed them went to put the guide plates on , and rubbed on guide plates . so i cut the guides down a bit for clearance and installed the roller tip rockers . i ran into a problem with the rockers in angle to left or right, only a few of the outer ones are straight like they should be . will i have to have some head work done like shave the head where the push rod wont rub on the inner part ? thanks

Last edited by rude 72; 09-22-2008 at 03:43 AM.
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Old 09-08-2008, 12:18 PM   #2
Awesome Bill
 
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off set rockers!
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Old 09-08-2008, 03:36 PM   #3
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I've moved this to setup discussions.
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Old 09-08-2008, 04:27 PM   #4
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I am unclear of where he is having problems. Is the contact with the intake runner?

Jake
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Old 09-08-2008, 07:37 PM   #5
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It sounds like your noticing the rockers sitting at somewhat of a "V" shape? If so, that is common and not a issue to be concerned with. The guides get moved in those heads and the rocker stud location remains in the stock position. The result is that the exhaust rocker is pretty straight and the intake rocker is angled. If you want the rockers to sit parallel to each other you will have to invest in offset rockers - but they are not required for the Pro 1 heads.
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Old 09-09-2008, 11:21 AM   #6
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I would be careful here, both valves are the exact same vertical height and the pushrods are supposed to be the same. Geometry determines what push length you use. Anything that is off more than .050 wears the valve guide and associated parts. 3/8 push rods are very hard to get into any head and most require offset .180 lifters and offset rockers to move the pushrod away from the already moved over intake runner. Shaft rockers up to .350 is what we use for anything other than 5/16 push rods. Just cleaning the side of the intake runner in this case might work. I take up to .030 off in the mill with a special cutter. Very hard to be exact and it gets very thin quickly!

Last edited by Awesome Bill; 09-09-2008 at 11:23 AM.
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Old 09-22-2008, 03:42 AM   #7
rude 72
 
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thanks to everyone with your answers , i guess i will just go with the 5/16 push rods , but still the valves and the push rod guide holes will still be off set . im sorry for being dumb about this but this is the first engine im attempting to build for myself . thanks again , Danny
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Old 09-22-2008, 05:52 PM   #8
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With a good heavy wall 5/16" pushrod your good for 650 open with a good stable lobe design and stainless steel valves.

If you had a radical lobe design like a Super Stock lobe i would look into 725-800 open but you better have good parts, shaft rockers and more

The intake rockers dont sit straight

Dart actually addressed this issue by supplying you a paper that shows the intake rockers sit at an angle compared to the exhaust. I have thrown away probally 10-12 of these

Maybe Dart Vader can upload a copy of one of them on here for you to see ??
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Old 09-22-2008, 06:04 PM   #9
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Here's the rocker arm alignment sheet Trmnatr mentioned.
Hopefully the visual helps to clarify things!
Attached Files
File Type: pdf Dart Rocker Align SBC-1.pdf (376.6 KB, 58 views)
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Old 09-22-2008, 06:32 PM   #10
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Quote:
Originally Posted by Dart Vader View Post
Here's the rocker arm alignment sheet Trmnatr mentioned.
Hopefully the visual helps to clarify things!
That would be the one !!

Wow, Your pretty quick. Got to go now
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