Hg question

[Hachibill]

I was wondering when the stock head gaskets start to fail on first gen 1u's? Can they withstand the cylinder pressures of 400-500 whp? Just wondering if it was possible like it is on a 2j. Unlike my7m which needs hg and studs at anything above vacume.

 

[stevechumo]

I was wondering when the stock head gaskets start to fail on first gen 1u's? Can they withstand the cylinder pressures of 400-500 whp? Just wondering if it was possible like it is on a 2j. Unlike my7m which needs hg and studs at anything above vacume.

I'd say 400 rwhp with a good fuel system and good ECU for tuning. 500 rwhp is really stretching. I think the 2JZ has steel HG, so it can withstand more pressures than the 1UZ with graphite HG.

 

[Hachibill]

Thanks, thats what i needed to know. Since im shooting for around 450 or so i think im just gonna do them before i put the motor in.