Obvious differences between engines

[cattlerepairman]

My 76 has a white engine in it. Tag on it says it's a 73 engine and it has a 77mm stroke. My 70 has a Hercules engine in it build tag says 10-91 with a 74mm stroke. I'm wondering if the cranks are different or a misprint. The 76 will whip the 70s rear end but the fdc isn't bypassed yet. Fuel screws are close to being the same. Both have been cranked up. The 76 will pull a hill only dropping one gear with 5 ton of gravel in the bed. The 70 I have to downshift 2 gears on the same hill empty. Any insight would be appreciated.

The engines would need to be set up as identically as possible before making a comparison.

FDC bypassed = fuel turned up.

Fuel settings alone have a huge impact on how peppy the truck feels, and some impact on actual performance.

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[Kwaligura]

Bypassing the fdc is on my list of things to do. Today I worked on getting the water pump out without pulling the radiator. The belts were all cracked up so I went to the parts store. I love it when they say what can I help you with? I giggle and say its not in your computer but they try anyway. It was almost 7 and napa was closed. They still have books. Guy at Advance just looked at me weird when I asked if they had a belt measuring tool but I thought with the numbers being 390 that they were 39 inch belts. I had to show them how to use it. Will go to napa on my next day off.