About the only thing I can think of would be if the relief valve in the pump jammed that might cause it.
The GTE has enough "leaks" that you shouldn't burst the Filter but you need to correct this ASAP before you drive it.
(I wasn't being a smartarse with the "correction" it's just nice to have accurate info here so everyone benefits)
In my case with the benefit of hindsight I "should" have built a 2JZ and dropped that in but I have so much 7M gear stockpiled for this build I'd take too much of a hit if I sold...
JT: Sorry to hear this :(
Agreed if you buy a built motor this is one of the risks as they don't budget for proper inspection.
How often have you seen people here pour $$$ into a head then be back 2 months later with a BHG? (Just about bet their head was never check for hardness!)
It...
CT: It would be risky trying to punch a 7m out to 86 as these engines are thin wall castings and with the bore spacing so close together there's not a lot of meat there.
One of the guys had one sonic tested awhile back and I think "safe" was 85mm.
The only real "benefit" from destroking is...
Head design
Mk4 Valves have wider spacing/better angle so you can fit bigger valves in.
And being a square layout 86x86 they have a lower piston speed and more room for valves.(7M is 83x91)
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