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Originally Posted by Skip Fix
I never understood the rationale of a single plane on a 301.
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The intake ports on the head are siamesed so there are only 4 intake runners. There really isn't any reason for a dual plane with those heads. I never understood the reason they made such oddball heads in the first place. They could have put some more weight on them and made the ports bigger.
The 301 has an apetite for timing chains. The best recommendation I've heard is to change the timing chain and gears at 50,000 miles. I had one that went 89,000 miles before it jumped time. That's how I found out. Don't let one go anywhere near that long or you're just begging for trouble.