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05 Silverado / 139k miles Out unknown oil / ST filter In Maxlife 5w30 / TG3506

2003 Silverado 5.3. / 211k miles Out: Valvoline HM 5w30 / fram tg3506 In: Havoline 10w30 / ST3506

03' Silverado 5.3l / 206k miles Out: Havoline HM SynBlend 10w30 / TG3506 / 6k oci In: Valvoline MaxLife SynBlend 10w30 / TG3506

Was this a newer formulation of 300v? All the prior analysis I've seen show moly in the 600ppm+ range.

I spend a little extra for a Toughgaurd...

Terminator wheels look great on Fox's. I have them on my SN95.

Trickflow it appears from OP post.

SCT and local dyno would be the way. For self tuning you still have moates QH of course, but Megasquirt and Holly termi X come to mind. "Stock block stock cam" is the general turbo rule from my experience. And keep rpms down like you said. Currently i must admit I'm jealous of OP's motor! I...

Looks good. I have respect for n/a builds especially iron heads. I've seen some ported g40 head builds exceed 310rwhp which is awesome to me. Those are few, far ,and between. I'm going the on3 turbo route my self, eventually. With boost you definitely need a great tune on these blocks with the...

That would have been a fun car with 325whp , IRS rear end and suspension work. I have a lot of Maximum Motorsports parts and suspension work on my cobra. You'll only go as far as your heads will take you. 290whp on ported gt40 h/c/i sounds right. The 11R heads come in a 53cc combustion chamber...

What was your h/c/I setup? What do you think of the newer Trickflow 11R heads?

Cheap option would be Havoline HM 10w30 synblend box. $17 for 6ts. Valvoline 10w30 HM MaxLife would also get a vote but more expensive.

Current fill is M1 0w40 on my windsor... It's seen alot of Edge 0w40 too. These motors aren't picky. Another vote for pics.

I'm implying neither. I just think it's the wrong oil for this engine, regardless.

High zinc content for what ? Any euro spec oil will have 1k+ ppm zddp and be ample for that motor . That UOA scares me. Zrod is for old school big blocks and flat tappet engines. IMO. Not a 4g63. I would run Ravenol or Motul if your spending Amsoil type money anyways. Hell Edge 0w40 @ $22...

May i ask why Zrod in this engine? Is it stock or upgraded turbo? Etc..

I may have missed it but make sure its not an exhaust leak or inherent header tick. Castrol Edge 0w40 @ Walmart for $21.97 is exactly what i would put in that engine tomorrow. If it were me.

Flashpoint showing some fuel. 0w30 should hold better as well.