New Years purchase

[mcbassin]

Originally Posted by Ilike 72"s

I enjoy working on these trucks--but-- yes it will hurt. About a $1,000 dollar hurt. Bad thing is that I knew better. The Jimmy sat for around a year and the gas smelled really bad, but I drove it 4 miles to the gas station and back.

That really sucks to hear about your engine. I have never heard of that. The carpet really looks great in there!

[Ilike 72"s]

Thanks,
I hope to have the engine back wednesday. I will assemble it AGAIN and hope to have it in and running this weekend.
The bad (old) gas is more volitile and can ignite and explode while in the compression stroke. That exploding gas puts pressure down on the piston while it's still comming up. Then it fires again when it gets to the top when it should. All this creates tremendous heat and pressure in the cylinder. Thats when the ring landings cant hold the ring, and it breaks.
NOW you have more heat and pressure going down the side of the piston, heating the side of the piston and getting in the crankcase. Now you also have pressure in the crankcase hammering up on the ring landings also. Every thing goes to s#!t.

[Ilike 72"s]

Got all my machine work done. Decked the block and bored to .040 over. Turned the crank .010 under. Surfaced the heads.
This time I installed new pistons and rings. New bearings through out. True roller chain and roller cam with roller lifters. New harmonic balancer because the old one had a wobble. More important is that I replaced the old gas.

[Ilike 72"s]

Back together and running. Set the timing at 14 Before TDC and 34 total advance. Runs real smooth and has lots of torque. I put 40 miles on it today in the sun.