Real Fiero Tech

Here is a blank: https://www.onlinemetals.com/en/buy/alloy-steel/2-25-alloy-steel-round-bar-8620-cold-finish/pid/9601 72" is more than enough for 3 camshafts I wonder if they meant a blank already machined to length with some rough work already done. http://jonescams.com/custom-camshafts/ Not s...

Cam grinding sort of has my interest now. i can easily adapt a CNC lathe to grind cams. Are there no aftermarket cams for the LZ4/9 that keep the VVT? I have seen the cams from the older engines used with spacers. What are they charging these days for a custom grind for a 6-cyl? Checkout this beast ...

I build all sorts of custom robots and 5+ axis machines as well as additive manufacturing tech. I could print sand molds and cast aluminum rockers or cam blanks and grind them. It just more of a project than I planned. @ericjon262 What ratio are the comp "Magnum" roller rockers? If they we...

I'm just happy to provide useful pics, measurements and info for those that might be wondering how or what if.

The question of how to use LS7 1.8:1 rockers on LZ9/4 heads was an unanswered question on several threads here and other forums.

I'm not planning a cam swap. I'm planning on keeping the VVT. I'm just making simple improvements for reliability and a little performance. It will be a daily driver for someone and I don't want to service much besides filters and fluids for quite a while. If max power was the goal I can just buy an...

I have to see about putting an offset in to change the rocker position. I still have to check the clearances for the pushrods and the valve covers if i do so. Not sure yet how far i want to go into changing rockers, pedestals, pushrods and fabricating valve covers, etc. etc. if need be. How many HP ...

The LZ4 pedestal, head and screw are all M8 x 1.25.

The shoulder on the LZ4 rocker screw is 8.4mm.

The through hole in the LZ4 rocker pivot is 8.4mm

The through hole in the LS7 rocker pivot is 8mm.

The wall thickness of the LS7 rocker pivot at its thinnest point is 5mm.

LS7 1.8:1 rocker on LZ4 head and pedestal.


You can see the the rocker walks off to the side of the valve stem with a M8 screw installed as the valve gets lifted in the video below.
https://i.imgur.com/6ZxEpKG.mp4

LS7 1.8:1 rocker on left, LZ4 rocker screw in middle, LZ4 1.7:1 rocker on right https://i.imgur.com/Jvt9120.jpg The shoulder on the LZ4 machine screw is ~0.4mm (0.016") too large for the LS7 rocker pivot. The LS7 rocker pivot hole will have to be opened up a bit to use the LZ4 rocker screw or m...

Just some numbers for posterity. Cam lift: 0.271" +/- 0.001" (not measured, info from other threads) Edit ** Update 0.271" +/- 0.001" measured** Valve lift with 1.7:1 rockers: 0.4607" Valve lift with 1.8:1 rockers: 0.4878" 0.0271" difference, 5.88% increase Is ther...

Rocker ordered.

LZ4 Head - rockers


Looks like there might be enough space between them. I can always make some new valve covers.

Not much room left for bigger valves though.

LZ4 Head - combustion chamber

Did anyone ever find out of the LS7 1.8 ratio rockers work on the LZ9/LZ4 heads?

12577695 - LZ4/LZ9 1.7:1 Ratio Straight Rocker, Intake and Exhaust

12579615 - Ls7 1.8:1 Ratio Offset Intake Rocker

12579617 - Ls7 1.8:1 Ratio Straight Exhaust Rocker

If the factory can control it then I can most likely control it. The more difficult aspects of automotive controls are having to RE things on CAN bus and similar where the makers don't like to share info with those not blessed by the factory with some license fee or subscription. Worse is what tract...

This site says it is the GM 6-Speed 6T70 M7W for the front wheel drive version. Thanks! Good to know. https://gmauthority.com/blog/gm/gm-transmissions/m7w/ Found in: Vehicle Engine Cadillac SRX 3.6L V6 LFX NA Cadillac XTS 3.6L V6 LFX NA Chevrolet Equinox 3.6L V6 LFX NA Chevrolet Malibu 2.0L I4 LTG T...

Some pics of the body.





Was the factory using polyurethanes by '85? It acts like a urethane vs a lacquer. What's left of it anyway.

The 4T65E came with the engine. It's a future family members car. She wants to keep it automatic and daily driver. For 2007 the LZ4 : Pontiac G6 ( coupe ) 224hp ( 167kW ) @ 5800 rpm SAE CERTIFIED Pontiac G6 ( sedan ) 224hp ( 167kW ) @ 5800 rpm SAE CERTIFIED Pontiac G6 ( convertible ) 217hp ( 162kW )...

https://www.youtube.com/watch?v=TGf8IMwRuIY He's in NJ, but his accent is wrong for NJ

rusEFI has a full simulator for you to try your setup before you commit to using any hardware.

https://www.youtube.com/watch?v=izhxVPfNxu4

https://rusefi.com/forum/viewtopic.php?t=619

A stock set of pistons. The owner works for a GM dealer. We are keeping the VVT and DBW. ~240 hp should make for a nice daily driver here 9 months out of the year. It is being built more for reliability and modern updates than anything performance. The dash will become all digital in the stock bezel...

Starting a swap of a 2007 G6 LZ4 + 4T65-E into an 85 currently with an iron Duke and automatic. I will be using rusEFI for the engine and trans control. LZ4 https://en.wikipedia.org/wiki/GM_High_Value_engine#LZ4 2007 GM 3.5L V6 VVT ( LZ4 ) https://www.g6performance.com/forum/archive/index.php/t-1334...