Roller rocker arms on a roller 307 Olds?
- Thread starter kustomkyle
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Thanks for all the info. These rockers may be a bit much for what I'm doing and what I want to get involved with, but the knowledge should help anyone in the future doing an Oldsmobile.
Part Numbers, Ford rockers..... maybe bookmarked would have been a better word
Save your money for something else. Have you ever seen a proper wear pattern on a valve tip when engine builders check for pushrod length? It is RARELY more than .060" wide. Friction at the valve tip on a rocker arm is minimal. The rocker is barely moving across the valve tip. The friction is at the trunion where the rocker does all of its movement. Also a majority of hp gain from roller rockers is preventing rocker deflection due to higher than stock valve spring pressures. Magazine tests don't show the whole picture for any test because they show 1 engine. We played with Circle track motors on the dyno of varying hp and saw different gains. On low hp engines a true roller rocker may gain 5 hp. When you got high enough in spring pressure to be deflecting the rocker, you could see 10-15. On race engines that roller rockers were required, we would see sometimes another 10 going to a 1.6 on the intakes. But on a magazine engine, you could put stock rockers on a race engine, and make horrible HP. Then when you put 1.6 rockers on it and make 30-35 hp everybody oohs and ahhs about it. So in the grand scheme when you are doing multiple things and looking for 5 here and there and it all adds up, roller rockers help. But to just put a roller tip rocker on an engine, you won't notice any difference.
Other than the pedestal, it adds adjusting valves and as said above, the gain will be little if any. I went back to the factory rocker arms on my current 350, I had issues with not cranking the poly locks tight enough. I swapped the 1.6 roller tip rocker arms to 1.72 true roller rockers, 9.6 to 1 ported heads with the too small 204/24 cam and maybe saw a tiny gain. I swapped from stock 1.6 to 1 stock rockers to 1.72 to 1 roller rockers and saw no gain that I could tell. I went back to stock rocker arms and still have an annoying tick, I think it is a sticky lifter, ticked no matter how I adjusted the valves.
If anyone sees this, is it common practice to replace the rocker assemblies on Oldsmobile engines during a rebuild (like say push rods, rings, lifters)?
Or are they strictly inspect and replace as needed?
Or are they strictly inspect and replace as needed?
Just check them for excessive wear and cracks, and put them back in. POSSIBLY try to keep them in the same location they came off of when you put them back together. But otherwise if they aren't damaged, reuse them.
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