5.9 Magnum Street Build - with dyno numbers
I put a pair of Indy LAX heads on my 360 back in 2012. They of course are (were, since I believe they are no longer available) Magnum type heads with provision for rocker arm shafts like a pre-Magnum small block. I put them on as delivered except for port matching. With less than 100 miles on them, the #7 intake valve stuck open. I drove it the five miles to home. Popped the driver's side valve cover and the problem was obvious.
The #7 intake valve looked like this:
Fortunately, I had factory replacement cast pistons that were .090 below deck at TDC. Also, the cam was a mild Mopar Performance grind with .450/.455 lift. Once the valve bent, it cleared the piston - without even leaving a mark on it. The valve seat in the head was undamaged. Bought one new intake valve from Indy, the machine shop opened the guide a tad, and put it back together. I don't think I even had to replace the pushrod, but it's been a while, so maybe I'm just not remembering.
That was before I ever heard of FABO. If I had been able to read this post back then, I probably would have gone ahead and installed bronze wall liners, but I did not. Anyway, it's been fine for more than a dozen years now.
I put a pair of Indy LAX heads on my 360 back in 2012. They of course are (were, since I believe they are no longer available) Magnum type heads with provision for rocker arm shafts like a pre-Magnum small block. I put them on as delivered except for port matching. With less than 100 miles on them, the #7 intake valve stuck open. I drove it the five miles to home. Popped the driver's side valve cover and the problem was obvious.
The #7 intake valve looked like this:
Fortunately, I had factory replacement cast pistons that were .090 below deck at TDC. Also, the cam was a mild Mopar Performance grind with .450/.455 lift. Once the valve bent, it cleared the piston - without even leaving a mark on it. The valve seat in the head was undamaged. Bought one new intake valve from Indy, the machine shop opened the guide a tad, and put it back together. I don't think I even had to replace the pushrod, but it's been a while, so maybe I'm just not remembering.
That was before I ever heard of FABO. If I had been able to read this post back then, I probably would have gone ahead and installed bronze wall liners, but I did not. Anyway, it's been fine for more than a dozen years now.