It is tempting to make upgrades but I have to keep the truck emission legal. The 392 cam is VVT, my truck is not.
One guy suggested the Eagle heads but that would bump my compression up too high.
They are not big blocks designed in the 1950s, 12 to 1 is fine on pump premium, thats what mine came out to CCing everything when I put them on my early 5.7.
If this truck were just a toy, that would be tempting.
I'm going to drive this truck like I always have. All weather, all conditions. Empty, loaded, towing or not. I can't risk building it where I'm always obligated to running the most expensive fuel. Right now, I can used 87 octane with no noticeable drop off in mileage or performance.
If I have to bore this block and replace the pistons, the Eagle heads may make sense. I could get dished pistons and keep the compression in the mid 10s to allow me to get by on 89 octane.
