Re: SBC Horsepower estimate
Posted: Mon Nov 06, 2017 10:07 pm
Just realized I typed YOLKS, not yokes! No yoke!
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MadBill wrote: ↑Mon Nov 06, 2017 9:55 pmWith plenty of throttle to spare, my '70 -1/2 Z28 with 12:1, xxx140 cam, cross-ram, headers, 3" exhaust, etc. pulled 7500 in 4th with 26.5" tires and 4.10:1 gears. (144 MPH), but then...
.Broken Rod 001.JPG
Yours was the kind of crack supposed to be caught in factory magnaflux, but lengthwise cracks were supposed to be OK. When I tore the 1st Z down, 2 rods had lengthwise cracks an inch long in the pin area. The dealer installed a 327 fitted block in my 2nd Z with the original 3" crank. That's the one which was the real slug. Didn't know what was causing low compression until I took it apart. Pistons were 1/8" in the hole. NEVER let a dealer work on your car. This job was performed for the previous owner. I had the paper work for the job, but the fitted block was only identified with part number. Didn't know it was wrong until I chased down the number after seeing the pistons were too far down. One thing I learned about SBC's. You never knew what you would find on a tear down. One I tore down had roller lifters on a 30-30 cam. The owner said it didn't run right after installing a different cam. And it squeeked.