My son and I have spent the last few months working on a 88 K5. We're going to use it as a skiff launch vehicle on the beach in AK so I wanted all the electronics removed, lockers installed etc.
The mods to the rig were Summit 1787 cam and springs, Weiand Stealth intake with new Edelbrock Thunder 650cfm carb along with a Skip White Hei. I also intalled a new Y pipe, shorty cat converter and Dynomax Turbo exhaust. We put a PowerTrax Lockrite locker in the rear and a Spartan in the front. All new bearings/u joints/ball joints/etc. Since I had removed so much of the electrical, I added a 700r4 4th gear manual lock up to the trans.
I was pulling a 26' tandem axle empty boat trailer that had 4 - 31 x 15.5 x 15 tires strapped on it.
I was surprised at the poor fuel economy as I was hoping for something in the 13 - 15 mpg range but instead got 8.5 at 65 mph and 11 at 60 mph. I was running stock tires with 3.73 gears and ran the lock up whenever the road conditions permitted. Couple that with the 6.00+ per gal fuel cost in Canada and you've got a spendy trip!
Although I reworked the distributor and adjusted the new carb with both tach and vac gauge prior to taking off, I think I was running too much with the secondary air flap open somewhat hence the poor mileage.
All in all, it was a great trip with beautiful weather for this time of year (only ran the wipers for about 2 hrs of the 60 hr trip and that was in Seattle) and saw lots of wildlife. Even my wife said that she was surprised how comfortable the seats/ride was and that she'd consider doing it again.
We rebuilt a 1984 K20 a few years ago for hauling fish off the beach in Alaska and now the Blazer rounds out our fleet.
Long live the Squarbody's!!
The mods to the rig were Summit 1787 cam and springs, Weiand Stealth intake with new Edelbrock Thunder 650cfm carb along with a Skip White Hei. I also intalled a new Y pipe, shorty cat converter and Dynomax Turbo exhaust. We put a PowerTrax Lockrite locker in the rear and a Spartan in the front. All new bearings/u joints/ball joints/etc. Since I had removed so much of the electrical, I added a 700r4 4th gear manual lock up to the trans.
I was pulling a 26' tandem axle empty boat trailer that had 4 - 31 x 15.5 x 15 tires strapped on it.
I was surprised at the poor fuel economy as I was hoping for something in the 13 - 15 mpg range but instead got 8.5 at 65 mph and 11 at 60 mph. I was running stock tires with 3.73 gears and ran the lock up whenever the road conditions permitted. Couple that with the 6.00+ per gal fuel cost in Canada and you've got a spendy trip!
Although I reworked the distributor and adjusted the new carb with both tach and vac gauge prior to taking off, I think I was running too much with the secondary air flap open somewhat hence the poor mileage.
All in all, it was a great trip with beautiful weather for this time of year (only ran the wipers for about 2 hrs of the 60 hr trip and that was in Seattle) and saw lots of wildlife. Even my wife said that she was surprised how comfortable the seats/ride was and that she'd consider doing it again.
We rebuilt a 1984 K20 a few years ago for hauling fish off the beach in Alaska and now the Blazer rounds out our fleet.
Long live the Squarbody's!!

