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Old 10-19-2022, 11:53 PM   #7
theastronaut
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Join Date: May 2011
Location: Anderson SC
Posts: 4,049
Re: 66 c10 engine upgrades

Oem HEI would be the best option for ignition.

Remove the stock mechanical fan and swap to an electric fan and shroud, I just did this on my '66 with a 250 and it made quite a noticeable difference in power and it's quieter.

The stock intake/carb is probably the biggest restriction, along with the mild cam specs.


There are parts/mods out there to make 300 hp out of a 250, just depends on how much you want to spend.
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