FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: allrightmike on March 04, 2021, 06:35:14 PM
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OK, I probably made a mistake when I bought the Speed Master cast stainless rocker assys. couple years ago. Now have them installed in the 427. I have corrected machining errors and other quality problems that could be corrected by machining. I have good geometry, rocker spacing and so-forth. Using comp. 282S cam, around 125 seat pressure with comp. recommended springs. Street use only but would like to "stand on the gas" once in a while! So the question is; just how bad are these damn things and what chance do I stand for a good outcome?
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There was another thread talking about these or some like these just recently.
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I did a search here on the forum, didn't find much pertaining to the stainless steel rockers.
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I personally wouldn't trust anything from Speedmaster/ProComp.
Not my engine, but I watched a SBC on my buddy's dyno spit out a set of roller tips from some Speedmaster/Procomp rockers. Also watched one of their distributors fail. Intakes are porous and leak.
IMO, they are a time bomb waiting to go off.
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Just my opinion...if I don't trust rockers for standing on the gas, I wouldn't trust them for cruising either. One hour of interstate cruising is over 60,000 cycles per rocker.
Nothing good happens if/when a rocker breaks...bent valves and broken lifters happen next.
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Thanks for the input, the engine has only cam brake in time on it at this point.. This is a 352 360 HP look alike, will most aftermarket rocker assys. fit under the old baldy valve covers?
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With that mild cam, why not just use the stock adjustables? add some HD shafts and run it
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With that mild cam, why not just use the stock adjustables? add some HD shafts and run it
X2. I've ran the factory non-adjustables at 400 lbs of open pressure with over .600" lift. Only bad thing is the shoe style rocker tip.
About anything will fit under a baldy.
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allrightmike,
Was there a major mis alignment on "one" rocker that required the stand to be re machined? I was given a set to test and when I was assembling them I found that and stopped . The offset was easily .100.
The rocker splits on the pushrod side due to (IMHO) side loading from pushrods that are too short. A wiser "designer" ( not a Chinese "copycat" person) could probably add material to make the rocker live. Trouble is the "copier" has never even seen the engine!
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allrightmike,
Was there a major mis alignment on "one" rocker that required the stand to be re machined? I was given a set to test and when I was assembling them I found that and stopped . The offset was easily .100.
The rocker splits on the pushrod side due to (IMHO) side loading from pushrods that are too short. A wiser "designer" ( not a Chinese "copycat" person) could probably add material to make the rocker live. Trouble is the "copier" has never even seen the engine!
Did not find anything that blatant wrong, mostly little things. Tapered shafts required refitting some of the rockers. Rocker sides not square and perpendicular with bore, making spacing difficult. While keeping as few adjuster threads as possible showing on the ball end, interference between the rocker and push rod did occur at full lift so some clearancing of the rocker was required in that area, I'd say maybe .020-.025 removed.
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I never got that far. When I found the gross misalignment , I stopped.