I think theirs some tuning left in it for sure. My 6.0 has 42# injectors and is in the 60s too. How much timing?

 

get a bigger cam, and a l92 cathedral port intake, dont remember which vechicles they came in i am sure someone will mention it, get a bigger cam and youre set. it wont hurt to spin up above 6k i spin mine up around 68-6900 but then again i am running a l92 truck intake!! and a stall wont hurt. my torque numbers on a stock 364 CI is 460/450 and i drive it daily

 

L92 truck intakes are rectangular port for use on L76/L92 heads. If you're thinking 90 MM cathedral port truck intake that would be a TBSS intake that came on the TBSS LS2. If you're running a L92 intake I hope you're running L92/76 heads, if not, I don't know how you got it on a set of 317/246/862's.

I just read you're sig, the "cathedral" part of your post threw me.

On a side note, what kind of fuel mileage is that truck getting?

 

everything about it is under done if you want max power. remember the dyno is merely a tuning tool not a dick measuring stick. if it feels good on the street, GREAT! would you rather have it feel strong but the dyno tell you you have 400rwhp or have it feel weak and have the dyno tell you you have 600rwhp? upgrade things on it as you feel necessary, as almost everything but the bottom end can be, and go from there

 

Ok, I'm a little confused now. The L92's are a big-block style, oval port instead of a cathedral port. I didn't know that there were L92 "style" truck intakes? So, are the TBSS intakes better flowing than the L76's or are they one in the same? Not trying to contradict you, I'm wanting to clear this up for my knowledge, thanks!

-SS

 

The L92’s are truck motors and as such come with truck intakes. Now the heads are used on other motors in various forms, such as the LY6 which is the newer iron block 6.0L and the L76/LS3’s which are car motors and have car intakes. While the TBSS’s LS2 truck intake looks similar from the top side, which is obviously different from the LS2 car intake, it is for cathedral ports.

Are you even more confused now?.........LOL

 

Let's simplify,


If you want to use L92/L76 cylinder heads (rectangular intake port) > use a L92 truck intake


If you want to use 243(799)/317 cylinder heads (or an aftermarket cathedral port) > use a TBSS intake, or LS6 (which would require modding W.P. config or use car accessories).

Typically when referring to "oval port" on LS heads, one is talking about the exhaust port, ie. D-port 317's vs. oval port 862's.

Hope this helps you get un-confused!

 

think you may have got it backwards there, the 317s have the D port exhaust, the 862's are ls1 style round exhaust ports

 

Thanks for that, I have corrected my above post.

 

Well, 400RWHP is low for a 7.0L. The most important thing is are you happy with the performance. The dyno number is just a number. Having 400RWHP and 450RWTQ does make for a fun driver. Since you have a 7.0L with a small bore and long stroke your hp isn't going to be as big as a 7.0L with the larger bore. The larger bore opens up the valve area and unshrouds it as well as allows for bigger valves. Your cylinder heads are too small for that cubic inch. They aren't going to hurt anything, don't take it that way. My point is you can go much larger on the cylinder head and not lose any torque. In fact you will only gain torque and hp from a bigger/better head. The cam isn't too small to me. It is a bit on the small side, but big cubes and a small cam drive like stock with torque like a boosted motor. Cylinder head flow is way more important than having a big cam. I'd be looking into a set of Trick Flow 235's or a set of WCCH L92 heads. I'd also recomend going to a Fast 92 intake with an LS2 car 90mm throttle body or an 07' up NNBS 5.3L intake if you stay with the cathedral port heads. If you go with the L92's the truck L76 intake should be good enough as it's not much less flow than the L76 car intake and the Fast isn't out for it yet. The single 3" flowmaster is a restriction for sure. I'd recomend looking into a set of 1 7/8" American Racing headers with a 4" exhaust (possibly Corsa) or a dual 3" exhaust. The clutch fan on there also means you have a 28" radiator if this engine is in a half ton. Going to a 34" radiator with e-fans would be a good option down the road also. Just my thoughts. Either way congrats on the build. Big cubes are so much fun.