What did you do to your NBS GMT800 Tahoe/Yukon Today?

[mattbta]

I should be migrating to near Ft. Worth around June.

That's not east Texas! Come on down!

 

[Sam Harris]

Smith Brothers for the trunion upgrade is what I used for both mine except I ended up throwing Yella Terra full roller rockers on my Denali later ($$$ for those lol).

Oil pump…if you have any kind of high mileage the high volume pump is recommended. I used Melling’s HV on the Denali.

Timing chain…I used a Cloyes True Roller set on both trucks. They’re high quality but won’t break the bank.

Thank you Mark! Ordered the Smith Brothers trunnion upgrade. Appreciate your feedback!

 

[Sam Harris]

That's not east Texas! Come on down!

Closest major city. I'm looking close to the Tyler area.

 

[Sam Harris]

Guess I should be getting some rockers as well..

 

[Rocket Man]

Thank you Mark! Ordered the Smith Brothers trunnion upgrade. Appreciate your feedback!

You’re welcome my friend. I love helping others spend money!

 

[Rocket Man]

Guess I should be getting some rockers as well.

Rockers? I thought you were doing a trunion upgrade on your stock ones?

 

[iamdub]

First off- I like the new avatar.

I want a fairly good chop in the cam, so expect that’s pretty easy to accomplish with the correct lsa around 112 or so, but I also want the best low end torque I can get with the stock 5.3. Not necessarily the best top end.

Tighter LSA leads to low-end torque as well as chop.

stainless valves / hollow stem valves / inconel.?

None of this is really necessary at this level. You're not revving high enough to really benefit from the exotic stuff. Stock valves are fine.

Chamber size? 68cc is standard and I expect I want to stick with this, to avoid and milling, rather than sending brand new heads off to the machine shop.

Does PRC build the heads in these packages to suit? I'd recommend getting SCR to ~10.5 or higher. If 87 is a must, maybe at least 9.5-9.75ish? So, whatever chamber size will accomplish this but not put your PTV in danger. If you want thinner head gaskets as part of the equation, I think Fel-Pro has .045" for about the same price as OEM. I saw this long AFTER I ordered $80 Cometics.

Pushrod length: defaults to 7.475 I’m assuming that’s factory length. No idea if I’d need a different size until cam is in and heads are on.

That's seems really long. Stock length is 7.385", but most round it to 7.400" for some reason. Performance cams often, if not always have a .050" smaller base circle, requiring a .025" longer rod. Any other changes from stock (heads, gaskets, etc.) will alter the rod length. A 7.400" rod is the general standard for cammed engines to maintain stock lifter preload.

Are those PRC heads made from virgin blanks or are they reworked stock heads?

Cam: looking at Stage 3 truck 216/220, .600”/.600” (112 lsa)

Will definitely chop and have good low-end and certainly top-end. You're covered with the converter. Gear ratios are a considerable factor- whatcha got?

Timing chain: I think this is wise to replace, but I have no idea what to go with for the replacement. Lot of options..

Can't go wrong with the OEM "HD" LS2 chain. GM uses it in their GMPP line and it's the standard in the Gen4 engine. I believe the part number is 12646386.

Oil pump: I think this is also wise to replace, and don’t think there’s any need for higher pressure, but higher volume may be desirable.. so thinking the Melling HV pump.

If your current pressures are fine, a new OEM pump (which could be Melling) will be fine. If it wouldn't hurt to have a few more PSI, get it from more volume. Look into the Melling M295 or M295HV. I got the HV for mine and I'm pretty sure your Gen3 would take the same.

Rocker arm trunnion upgrade: I definitely want to upgrade these but TSP kits are back ordered..

The RPMSpeed Max Effort kit would be my choice. I'm not totally convinced on the bronze bushing kits. If I were to try them, I'd get CHE.

Any advice is very much appreciated

I also need to determine what is involved and part list what I need to swap the existing intake, for the NNBS intake. Money is less of an object at the moment, than time.

ETA: Any other supporting mods that I haven't listed here will certainly be appreciated, and entertained..

I'm pretty sure your '03 is a three-bolt TB, yeah? That's a changeover year- is your TB cable-driven or drive-by-wire? Besides the TB, the injector size and plugs are the only other possibly mismatch I can think of.

 

[mattbta]

Have we talked valve springs, yet? Need something more stout than the old ls6 for that lift. I just haven't kept up since my f-body days. Lots of companies had challenges with keeping springs from breaking back then. That's part of the reason the Truck Norris appeals to me....plus it kinda sounds like my old hotcam which was relatively low lift, too.

 

[Sam Harris]

Rockers? I thought you were doing a trunion upgrade on your stock ones?

I definitely want the trunnion upgrade. Can't those be used with either the factory rockers, or aftermarket? Or would I need to get a kit that has both to use on aftermarket rockers? Sorry, I'm pretty clueless.

 

[Tonyrodz]

Closest major city. I'm looking close to the Tyler area.

Ready for that heat?