my KRE D ports have 5000 series Farrea valves. been going without issue for more than 20,000 miles.
I don't think you'll ever be in a worse position if you opt to spend a little more on the valvetrain, especially if it's lightening it up. But do I personally think it's necessary given this build, nope.
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-Jason
1969 Pontiac Firebird
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