3/8 vs 7/16 rocker stud info
02-21-2019, 09:11 AM
#3
I can't understand how a properly set up valvetrain can snap a 3/8 arp stud? I use 1.6 SA crane rr's and 3/8 arp studs with good luck so far. And my 383 used 3/8 studs with a cam in the .600 lift area with no issues.
I have heard very reputable engine builders say they have seen 3/8 arp studs snap, I just dont see how it happens with good valvetrain geometry? Regardless, my next engine build will have the 7/16 upgrade.
I have heard very reputable engine builders say they have seen 3/8 arp studs snap, I just dont see how it happens with good valvetrain geometry? Regardless, my next engine build will have the 7/16 upgrade.
02-21-2019, 09:15 AM
#5
In my opinion, the 7/16 stud is used more to control valve float and improve stability at high rpm.
Nothing wrong with a quality 3/8 stud. This was just information I wanted to share.
Nothing wrong with a quality 3/8 stud. This was just information I wanted to share.
02-21-2019, 10:14 AM
#6
Village Troll 
iTrader: (2)
I can't understand how a properly set up valvetrain can snap a 3/8 arp stud? I use 1.6 SA crane rr's and 3/8 arp studs with good luck so far. And my 383 used 3/8 studs with a cam in the .600 lift area with no issues.
I have heard very reputable engine builders say they have seen 3/8 arp studs snap, I just dont see how it happens with good valvetrain geometry? Regardless, my next engine build will have the 7/16 upgrade.
I have heard very reputable engine builders say they have seen 3/8 arp studs snap, I just dont see how it happens with good valvetrain geometry? Regardless, my next engine build will have the 7/16 upgrade.
02-21-2019, 11:42 AM
#7
TECH Apprentice
Also a worthy note, that nice sweeping radius leading to the hex on the 7/16 adds alot more strength than the other one pictured. Sharp corners promote stress and are more prone to breaking than a radius
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02-23-2019, 11:59 AM
#9
Village Troll
iTrader: (2)
Every spring develops harmonics. It’s a matter of how it deals with it whether it lives or dies a horrible death. I’m just guessing it too can affect valvetrain parts especially those which are fixed to the engine. Maybe even promote unwanted vibrations especially if a more aggressive setup is used with the smaller stud. Or as mentioned with a more aggressive setup the stud may flex making the valvetrain unstable.