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7.4 vortec knock. Bad cam lobe

In the process of moving my suburban into the shop, I started the engine and heard a knock. It was a consistent sound. I figured it sounded like a lifter. So I thought, idle is ~800rpm, cam is ~400rpm, so 400/60 =~6.67 hertz. I plugged it into a hertz/sound generator...
- Coothethird
- Thread
- Oct 31, 2023
- Replies: 6
- Forum: Engine Performance + Maintenance
C
7.4 Vortec Intake Manifold Gasket Preferred Brands?

Hello! Are there preferred brands for intake manifold gaskets on the 7.4 Vortec's? Any that have been found to last longer than others? I am in the process of changing a set while changing injectors/reg. I wanted to see if anyone has found a preferred brand, or if any brands have lasted...
- Coothethird
- Thread
- Oct 18, 2023
- Replies: 6
- Forum: Engine Performance + Maintenance
C
1998 k2500 suburban fuel pressure drops

Hello! 1998 k2500 suburban, 7.4 engine. I am having a fuel pressure drop when accelerating for more than a few seconds at WOT. At idle the pressure is around 55 psi, moves up to near 60 psi during tip in or slight throttle. If I floor it to accelerate, after just a few seconds the pressure...
- Coothethird
- Thread
- Oct 14, 2023
- Replies: 8
- Forum: Engine Performance + Maintenance