429 Adjustable rockers
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Fleet Mechanic
Joined: Jan 2012
Posts: 1,668
Likes: 13
From: Saskatchewan
429 Adjustable rockers
So I’m building a stock ish 429 with D0VE heads and I replaced the cam with one from comp cams. I’m wanting to install adjustable rockers cheap. Can I replace the stock studs/nuts with ones from a big block Chevy and re-use the oringinal rockers? Will I need guide plates and hardened push rods? The stock rockers seem like they self align. Thanks
Lead Driver
Joined: Mar 2004
Posts: 8,922
Likes: 153
No, valve trains are never that simple. The studs wont work but it doesn't matter because the stock rockers are junk anyways. Get new guide plates & hardened push rods of the right length. With a hydro cam you can stick with the 5/16" push rods. You will have to start from scratch now and get the valve geometry set up right with the right parts.
Thread Starter
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Fleet Mechanic
Joined: Jan 2012
Posts: 1,668
Likes: 13
From: Saskatchewan
No, valve trains are never that simple. The studs wont work but it doesn't matter because the stock rockers are junk anyways. Get new guide plates & hardened push rods of the right length. With a hydro cam you can stick with the 5/16" push rods. You will have to start from scratch now and get the valve geometry set up right with the right parts.
Elder User
Joined: Nov 2003
Posts: 778
Likes: 2
From: southeast Idaho
I used a 275deh cam from comp with stock rockers and it worked quite well that way but any more lift and the guides would have to be cut down accordingly. You start getting over 525 lift and you need to check the clearance real carefully for your valve seals. I used the springs that came with the cam also. So as long as your cam isn't too big you should be fine..
Thread Starter
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Fleet Mechanic
Joined: Jan 2012
Posts: 1,668
Likes: 13
From: Saskatchewan
I used a 275deh cam from comp with stock rockers and it worked quite well that way but any more lift and the guides would have to be cut down accordingly. You start getting over 525 lift and you need to check the clearance real carefully for your valve seals. I used the springs that came with the cam also. So as long as your cam isn't too big you should be fine..
Tuned
Joined: Jan 2019
Posts: 364
Likes: 91
You're on the right track.I have the same deal you are thinking about in a car,.525, .530 lift cam,works fine,have done it before. Not the ultimate setup but you end up with adjustables,no guide plates or hardened pushrods. Get 16 thick hardened washers,iirc,3/16 thick,7/16 hole.and a new set of sbc stock rocker nuts. Get a Dremel with a flap disc and knock off the edges where the valve stems have worn grooves in the rockers. Stick the washers on top of the fulcrum *****,screw on the nuts and adjust away.Those nuts are a distorted thread design and really a 1 use only deal so don't work them up and down too many times. The washer thickness is a guess from memory but you will figure it out.
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Tuned
Joined: Jan 2019
Posts: 364
Likes: 91
With the cam lift mentioned in the previous post, PBM Erson 3100 springs work perfect for those heads. Installed height of 1.850 You can buy them cheap if you shop around.
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Thread Starter
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Fleet Mechanic
Joined: Jan 2012
Posts: 1,668
Likes: 13
From: Saskatchewan
You're on the right track.I have the same deal you are thinking about in a car,.525, .530 lift cam,works fine,have done it before. Not the ultimate setup but you end up with adjustables,no guide plates or hardened pushrods. Get 16 thick hardened washers,iirc,3/16 thick,7/16 hole.and a new set of sbc stock rocker nuts. Get a Dremel with a flap disc and knock off the edges where the valve stems have worn grooves in the rockers. Stick the washers on top of the fulcrum *****,screw on the nuts and adjust away.Those nuts are a distorted thread design and really a 1 use only deal so don't work them up and down too many times. The washer thickness is a guess from memory but you will figure it out.
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