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Flogged for the Fairgrounds

A Large, Huffed, Thunderin' Rat

In the beginning, we intended to build a lumpy-sounding big-block that would rumble the pavement while it cruised the fairgrounds of the Western United States. What we ended up with was one shag nasty mega motor that not only shakes the earth, but also produces some mighty impressive horsepower numbers as well. In doing so, we made careful parts selections, like with all build-ups. To further the cause, we called in the folks at Speed-O-Motive to help coordinate and assemble this new 540-inch monster. Keeping its intended purpose (and supercharger) in mind, we arrived at 8:1 compression. Everything went according to plan, as the Speed-O guys quickly showed us their capabilities. This shop builds lots of engines, powering everything from restorations to racing and marine applications.

Once the parts pile was complete, things progressed at a rapid rate, thanks to Speed-O-Motive's state-of-the-art machining department. And through the build-up, we only experienced one bummer--the brand-new DTS dyno was still being plumbed and wired, so we had to quantify the numbers out at the Vrbancic Brothers shop, located about 30 miles east of Speed-O-Motive. No big. Check it out, as we go through the build-up sequence and you're sure to see why this monster shakes the pavement.

DYNO CHART
Timing: 36&#176 Jets: 74 pri. 84 sec. Fuel: Union 114
RPM
LB-FT
HP
BOOST
4000 823 627 9.4
4100 829 647 9.4
4200 832 666 9.4
4300 838 686 9.4
4400 843 706 9.4
4500 843 723 9.4
4600 845 740 9.4
4700 847 758 9.4
4800 847 774 9.4
4900 848 791 9.4
5000 848 807 9.4
5100 847 823 9.5
5200 847 839 9.4
5300 842 850 9.5
5400 839 862 9.5
5500 836 875 9.6
5600 835 890 9.6
5700 835 906 9.8
5800 834 921 9.9
5900 831 934 9.9
6000 830 948 10
6100 827 960 10
6200 821 970 10.2
6300 815 978 10.3
6400 807 983 10.5
6500 799 989 10.6
6600 791 994 10.9
6700 783 999 11
6800 774 1003 11.1
6900 763 1003 11.2
7000 753 1004 11.2
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Super Chevy