Join Date: Aug 1998
Location: Waldorf Md. USA
Re: '85 1/2 Ton Squarebody 400 SBC build?
I had a similar experience as Ray. I had an 85 K5 Blazer that I bough new. 4WD 305 700r4 3.08 gears. It really was a pig towing. The trans started acting up around 150K so I bought a GM reman and at the same time took out the 305 and built a basically stock 87 350. Main difference was the hydraulic roller cam. I took everything external off the 305 including intake, carb, distributor etc and put it on the 350. Actually picked up a couple of MPG and major difference in power.
In your case the 2.73 gears are a killer if you want to tow. A 700r4 would help with the low first gear. Depending on what size tires you have it might not be much different that mine was with the 3.08's
I would build a basically stock 400. 8.5 - 9.0 compression so you can run it on 87 octane. Small basically stock hydraulic roller. You could probably do the same thing I did and just use everything from your 305.
Advanced Automotive Machine
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