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I was over 200k when I did the marine cam and rockers and over 220k when I put the blower in. I'm now sitting at 276k, you'd be a fool to rebuild the motor just because it has 139k on it.
^ Agreed. I'm about to slap a cam and springs in a 200K+ LQ4 before it goes into my red truck. Taking care to make sure I don't look at the cam bearings while doing so.
Taking care to make sure I don't look at the cam bearings while doing so.
If you're keeping the factory intake and fuel system, don't bother with replacing the heads. Have them vatted and magnafluxed because Vortecs love to crack, and often you can't see the cracks without magnafluxing. Want a cheap upgrade on the heads? Use stock LS2/LS6 valvesprings and Comp Cams 787-16 retainers with new, good quality keepers. Put some 1.6:1 rockers on the stock cam and you'll pick up 5-10 hp, or get a slightly hotter cam and go for a retune and more power.
I know I mentioned this earlier but now that I know which one it is I have to bring it up again. The Airaid is pretty much the worst intake option on the market for these trucks. You give up the low IATs of the sealed factory airbox, but keep all the restrictions from the factory tubing. You'd be better off putting the factory airbox back in or buying a Volant.
I've often wondered if 1.6 rockers would net some extra HP vs installing a mild tow cam and 1.5 rockers.
In the interest of simplicity and cost, which would you choose?
df,
Do you think the Volant would result in a few extra hp?