Re: Proper gas for 374 engine

Posted by Randy Berger On 2011/2/21 20:52:36

I run either Hi-test Amoco (B&P) or Hi-test Sunoco in my 56 400. I have hardened valve seats installed and RARELY take the car over 75. I do not have a pinging problem, but I am a little hard of hearing. No one else who has ridden with me has ever said they heard the engine ping. Engine was rebuilt in 99 (not bored) and crank cut.