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- 162
After 40 years, my neighbor said it was time to do something with my tired motor & volunteered to help. We dropped it out gave the motor to a respected local (two blocks away) engine builder (google, Byron Koury). I could have gone the crate motor route, but I wanted to keep my original block. It also retained the 271hp heads that I put on about 1975 (yes, I know they do not flow very well). I asked for a nice docile responsive street motor & that is what I got. My original dished piston, 200hp 289 now makes the same power / torque as the original 271hp motor that had real fuel, more compression, a solid-lifter cam & it's hp ratings were on the old inflated system.
Engine builders can play with their Dynos to yield higher than actual numbers, but this Dyno is set up very conservatively, & came up with about 274 hp & just over 300 ft/lbs of torque. Valve float was around 5600rpm & the distributors rev-limiter was set at 5400rpm. All tuning was done with the stock air-filter in place, so it will be a drop in & go installation. In today's world, 274 hp isn't a big number but nearly one horsepower per cubic inch is plenty for me.
Changes were Crane hydraulic cam / lifters / roller-rockers. The cam was degreed for better torque & is actually a milder grind than the one that I put in the engine when I was 25 years old. New valves, replaced exhaust seats, .030 over flat top forged pistons, ARP rod bolts, crank polished (no cutting required), Pertronix-3 stock appearing electronic Distributor that eliminated my MSD box. New 600 cfm carb, down from the too large 650 cfm I had on it for 30+ years. Everything was balanced from the new front damper to the Centerforce flywheel & pressure plate. Lots of other upgrades like new amazon hoses for the remote oil filter / cooler system too.
Now, I am just waiting patiently for Bill Martin's 5-spd conversion to be available....
Engine builders can play with their Dynos to yield higher than actual numbers, but this Dyno is set up very conservatively, & came up with about 274 hp & just over 300 ft/lbs of torque. Valve float was around 5600rpm & the distributors rev-limiter was set at 5400rpm. All tuning was done with the stock air-filter in place, so it will be a drop in & go installation. In today's world, 274 hp isn't a big number but nearly one horsepower per cubic inch is plenty for me.
Changes were Crane hydraulic cam / lifters / roller-rockers. The cam was degreed for better torque & is actually a milder grind than the one that I put in the engine when I was 25 years old. New valves, replaced exhaust seats, .030 over flat top forged pistons, ARP rod bolts, crank polished (no cutting required), Pertronix-3 stock appearing electronic Distributor that eliminated my MSD box. New 600 cfm carb, down from the too large 650 cfm I had on it for 30+ years. Everything was balanced from the new front damper to the Centerforce flywheel & pressure plate. Lots of other upgrades like new amazon hoses for the remote oil filter / cooler system too.
Now, I am just waiting patiently for Bill Martin's 5-spd conversion to be available....
