Single or dual springs

[Brant258]

I'm building a 1835 tw
9.2 to 1 compression
W110
Dual 40 hpmx
69 cw crank
Chromoly pushrods
1.1 rockers
40x35 AA performance heads
Should I run single or dual springs?
Engine will only be revd up to 5800 rpm

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HD singles or Beehives.
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[bugguy1967]

Wow! I feel like I'm looking at the specs for a current build! I'd recommend singles, unless you're using all heavy valvetrain parts. Your chromoly pushrods weigh over 80 grams, most likely, whereas stock aluminum weighs ~35 grams. If you have Engle lifters you're likely between 98-110 grams.

Are your AA heads the unported ones? If so, you'll be fine with singles. With porting, you'll engine will be want to rev higher than 6,000 rpm. You should then be running really good, SHIMMED singles or whatever duals.

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