The Sprint 6 package was available in the US in the Tempest/Lemans and the Firebird I believe from 66-67 maybe 68. 10.75 compression a hot cam, factory headers topped with a Rochester Q-jet. The Pontiac overhead cam engine standard version was also available. That engine uses the Buick/Pontic bell housing bolt pattern. I would suggest hot rodding the 250 Cubic Inch Chevrolet engine if you want a six. Port the head get a more aggressive cam, increase the compression and add headers. Do not be afraid to turn it hard, it is short stoked and has steel rods, routinely turned small journal SBC with factory rods 8,200 with no issues (roller cam 331s). I had a 66 Tempest with the Sprint 6 Package, and it would run with a lot of V8s. However, I think it ran lean on 1 and 6 when that Q-jet opened. I lost number 1 piston then number 6 piston then cracked the head in number 1. Pulled it out and replaced it with a 400 out of a 68 Catalina. With the dual Thrush I didn't fool anybody even with the 6-cylinder badges.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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