Originally Posted by wbt
There are a few other differences and advantages to the Roadrunner head over the Coyote:
1. Larger exhaust valves.
2. Lighter exhaust valves.
3. CNC ported.
4. CNC'd combustion chambers.
5. Clearanced for running larger lift cams.
6. Different alloy that provides better cooling.
IMO if you are looking to switch over to Boss heads I would go with the CJ cam's at the same time to take full advantage of the port work and the CJ intake to compliment it. While you have the front cover off, billet oil pump gears and Boss timing chain tensioners.
Should have no issues with a reliable 8K RPM N/A motor at that point.
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what is the main difference between the stock 5.0 and Boss timing chain tensioner?