Not so fast...I'm running a stock HG at 15psi on the ct-26 and its doing fine. I think it has been decided (at least in my mind) that the weak link is low head bolt torque. Toyota spec head bolt torque is only 56ft.lbs. Grim Jack ran a composite HG to about 20psi on a 57trim CT-26 (about 400+hp)...
Yea I was gonna say what Ian said. I had to do this on my trans drain plug.
EDIT- Is it totally round? Like a complete cirlce? Cause if you just rounded the edges off you might be able to get a smaller size socket on there or a standard size socket.
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