Upgrades for 402 LS

[WS6]

I wouldn't touch the engine beyond maybe porting the intake and TB. Those torque numbers are fantastic. You rarely see anyone talking torque numbers and location when building the LSx engine. I have no doubt LS3/L92 heads would make more peak power. I also have no doubt that you'll lose low end torque.

If you want to try a cam change, go wider on LSA. Narrower moves power band up, wider brings it down because it keeps the intake charge in the cylinder longer. You could try the XFI grind possibly. I'm assuming this is a Comp XER cam currently. Check the mid range lift numbers on the XFI cam though. I know overall it is higher but power is made in the low lift area not at .600 lift. However, having just as good a base but even more top end flow could help you.

I'd still not change it though. I say run it. It's great the way it is.

[Steve1968LS2]

I wouldn't touch the engine beyond maybe porting the intake and TB. Those torque numbers are fantastic. You rarely see anyone talking torque numbers and location when building the LSx engine. I have no doubt LS3/L92 heads would make more peak power. I also have no doubt that you'll lose low end torque.

If you want to try a cam change, go wider on LSA. Narrower moves power band up, wider brings it down because it keeps the intake charge in the cylinder longer. You could try the XFI grind possibly. I'm assuming this is a Comp XER cam currently. Check the mid range lift numbers on the XFI cam though. I know overall it is higher but power is made in the low lift area not at .600 lift. However, having just as good a base but even more top end flow could help you.

I'd still not change it though. I say run it. It's great the way it is.

The current cam is a 238/240 112+3 ... It was the biggest (at that time) in the XER line for off the shelf stuff.

Here's a dynograph, we were having problems with the XFI running the engine on the dyno and I think the peak numbers are a bit low (was breaking up a bit).

Still, the low end torque stuff is good.

Here's the engine dyno (compared to the before engine)


Here's the chassis dyno (rear wheel compared to with the broken spark plug)


Here's what I wrote about the AFR heads from back in '06

The LS2 crate engine ships with some pretty good heads that, with port work, can flow some respectable numbers. However, we decided to go with AFR’s newly designed 205cc Mongoose street heads. AFR states that the flow performance is 300 CFM at .600 lift (about 70 CFM over a stock LS1 head) and that the heads feature 2.020 intake and 1.600 exhaust valves with iron ductile interlocking valve seats. The AFR heads weight a bit more than the stockers, but that weight is in the right places with a .75-inch thick head deck, reinforced rocker stud bosses, and thick wall runners.