tvanlant

iTrader: (4)

I'm about ready to start purchasing parts for my engine build.
I've read about some issues with the LS2 / L76 blocks flexing at 1000+ whp and losing ring seal. Would using a stock stroke crank help with block reliability making big horsepower instead of a 4" stroke crank?

The engine build will consist of:

L76 block
ported LSA heads (354 cfm intake, 220 exhaust)
K1 crank 3.622 or 4.00
Compstar H beam rods
Wiseco pistons (9.8-10:1 compression)
LS3 intake manifold
Procharger F1R @ 20-25 psi
Cam - ???


I've also gotten pretty varying suggestions on what size camshaft to use. I'd appreciate any suggestions!

DavidBoren

A stock length crank will reduce the working angles of the rotating assembly and keep a greater percentage of the force pushing the piston down, turning the crank, being converted into work, rather than pushing it sideways against the cylinder walls.

So if you're trying to take precautionary measures to give your aluminum block a fighting chance, then anything you do to increase your rod ratio will prove to be beneficial.

SStressin

iTrader: (5)

I would also get a better crank then a chinese forging at those boost levels with a pro charger. There notorious for snapping crank snouts. I would atleast get a dragon slayer

handyandy496

iTrader: (9)

I would think the stock ls2 stroke would be great for a fi engine.
bore it to .030 over and use a longer rod .File your own rings to the piston makers specs for a fi engine.