Thanx for all ur input.I'm suspecting it's a weak relief valve. The car is now under wraps for the winter so nothing will be done until next spring. The gauge is mechanical and is ok. It's a newly built motor. The previous owner had it built for drag racing his 67 Impala, but after4 runs decided it wasn't fast enough so I bought it for my car. Thanx again.
Tuesday, December 9th, 2014 AT 10:36 AM