Originally Posted By 70440+6bbl
Sure sounds like what happened to the 440 in my '70 Bee a few months ago on the way to a car cruise. I knew I was in trouble when I pulled the #7 spark plug and found the tip smashed. To say I'm NOT happy with 440 Source heads would be the understatement of the century... Small hydraulic cam and under 6k RPM. In my case, the #7 intake locks pulled right through the retainer. The head is now a paper weight. The #7 piston (SRP forged) has the valve embedded in it. Twisted the "6 pack" rod slightly and the bore is cracked.


Mine were expensive Diamond 11:1 pistons and very ported 516 heads. The guy who built the short block didn't knock the rear cam plug in far enough and the cam "walked" that started a chain reaction that resulted in the #4 intake valve to go thru the piston, rip the cylinder wall, then it sucked pieces over into #1 (I think) beat up that cylinder and wall...oh yeah and fill the oil pan with antifreeze. At least I wasn't at the stripe going 120+ this happened on the way to the track.