New Year, New Truck: 1973 GMC Astro95

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I'l' second what @Ristow Said..
Speaking as someone who has spent a few years stirring one of those 8V71's (mostly at 90 odd thousand Pounds). I'd leave it alone..
you need to remember that those Gm's rev a fair bit freer than engines today do & also you've only 850-900 Ft lbs of torque as apposed to 16-1900 ft/lbs that Todays engines have...

Just relax & enjoy It for what It is.....

 

I don't think that's quite realistic with a 318. Mine was a 8v92TAC with advanced cams and big injectors and I would have had the foot on the floor at all times to roll like that .

What size tires on that,how tall . 3.90-4.10 would probably be ideal but I would run it a while with the 4.33. You may wanna find s silver 92 rather than rears. If you really like the truck maybe a series 60

 

Yep, gotta' spin them ol' ring dings. Needle against the pin, we'd always say. If it was mine, newer 500 Detroit, 13, 2:55's, turn that ol' right lane truck into a left lane truck, 10- fo.

 

Sweet old truck. Even for an Astro. I hope you wear clean socks. With those big windshields everyone will see.

 

I wonder if he has the radiator room to cool a newer motor. The 2strokes are easy to cool.

Rather than re gear the rears I'd go with a newer double over 13. Then you get the easier shift of the low inertia tranny. Cheaper too.

 

Maybe the 318, but my w900 that came with a 435hp 8v92 has the same radiator as the 3408 and K series trucks.

 

Right, but just looking at the front of that Astro, it looks like a smallish rad and little room to go bigger.

 

Slam finger in the door and hold er on the floor.