Has anybody run the Crower offset trunion rockers with longer than stock valves?
03-08-2014, 06:20 PM
#91
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When I went thru these engines a couple years ago, I have to admit, I fuked up on the pushrod length by quite a bit. I was way short on them. I dont recall how i came up with my numbers, but they were incorrect. I must have been on the sauce that day, or at least the day i placed the order for them. Enough, that when going over things today, I was losing a substantial amount of lift at the valve. Not to mention the sweep/contact pattern was horrendous. It was centered alright, but entirely too wide.Going over things using the mid lift method, it truly showed how far out in left field i was. Granted, the engines have ran fine, and no issues from that, but I'm still changing them out for new pushrods. Plus, I want to upgrade the wall thickness from my .080 wall anyhow. Thats actually what stemmed me to even double check my work.
Another issue I noticed, or should say Icdedppl noticed, was some wear on my rocker bodies. You can see there the stud and or polylock was rubbing on the body. Enough to wear some of the gold anodizing off. Checked over all the trunnion bearings, everything was tight and looking good. I was scratching my head for a bit. Then a lightbulb went off. I decided to check the poly locks. The crane rocker should have a .600 polylock. Checked mine, .550. The extra .050 of clearance was allowing the rocker to move left to right too much. The trunnion is machined for the .600 locks, so when using a .600 lock, there is very little movement. These were what was in the engine, so upon reassembly i took it for granted, that they were the correct polylocks, and never bothered to measure them. Obviously they were not correct.
So, now that I've admitted my foolish mistakes, its time to correct them. Always learnin something new!
Another issue I noticed, or should say Icdedppl noticed, was some wear on my rocker bodies. You can see there the stud and or polylock was rubbing on the body. Enough to wear some of the gold anodizing off. Checked over all the trunnion bearings, everything was tight and looking good. I was scratching my head for a bit. Then a lightbulb went off. I decided to check the poly locks. The crane rocker should have a .600 polylock. Checked mine, .550. The extra .050 of clearance was allowing the rocker to move left to right too much. The trunnion is machined for the .600 locks, so when using a .600 lock, there is very little movement. These were what was in the engine, so upon reassembly i took it for granted, that they were the correct polylocks, and never bothered to measure them. Obviously they were not correct.
So, now that I've admitted my foolish mistakes, its time to correct them. Always learnin something new!
