Your engines may be overheating and the electrical gage is saying it's ok. Is your sender in the thermostat housing or in your intake manifold. Summit racing has a mechanical temp gage you can screw into the intake manifold to double check your temps. It has a 6 foot line and 3/8 npt fitting. Stewart warner. 15 bucks. I had that issue last year. Engines were well over 200 and thermostat housing was telling me 130. warped valves , hotspots between valves and cylinders. Not to mention machining problems with the new heads i put on

not ready to bolt on. Must at least regrind the seats before using them

Most I’ve seen are bare.

I have a set you must have the seats checked and reground also check the deck surface. Most likely need grinding also. Do your port work first. Then send them to the shop. Valve guides are not true to the seats GUARANTEED

hey fever is machine ok now? I just had a guide come loose . Undoubtedly installation not done with enough finesse

my stock heads had rust migrating under the seats. I opted for new heads .The EQ 320CC 454A. If rust migrated into seats they could easily come out once they went through some heat cycles

Ive got 12 hours on it now and still running good. Only made it 4 hours last time.

He told me originally it was the heads but when i fot the motor back and it still didnt hold any pressure i took it back and he said intake was warped.

I thought it was intake all along for as much water as it injested.

good to hear I know you went through a lot bull for that👍