Hi All,
I'm new the the forum and there seems to have some knowledgeable characters lurking here.
So my question is, do the 2.8 V6 Colognes require double valve springs with BV heads to rev to 6000-6250rpm?
I have been running the BurtonPower TV416 HD single valve springs in my N/A 2.8/3.5L engine but am experiencing a dramatic drop off of power at about 5700rpm.
Sort of thinking it could be valve bounce? The engine has been revved to 6500rpm on a few occasions but doesn't sound like any valve bounce is happening.
My next round of planned mods to the engine will require the heads to come off anyway. So would like to hear from the brainz trust here on their thoughts in regards to duplex valve springs or is this dramatic power loss at 5700rpm normal for the N/A 5 port heads? I'm sort of leaning towards putting duplex in anyway.
The TV416 springs spec sheet says as a guide they are good to 6500rpm.
Camshaft spec is Isky F6-66 228 degree duration@0.050" 2000-6300rpm power band.
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