3.9L LZ9 engine internal upgrade & performance?

[mrtohil]

That is a good question about the weights though. If no one has the specs and/or a scale, I'll see if I can obtain a scale and post what I find since I have everything apart already.

[mrtohil]

Hey Nightingale, what the PN for the paper manual. And how much was it if I may ask? Is there a CD/DVD version available? I would like to get the manual myself and start reading up on it. I need to figure out how I'm gonna run this motor after I'm done with it.

[IsaacHayes]

Yeah thank the electronics for all that extra crap! LOL

[Nightingale]

I will page through tomorrow and try to get some scans, but ya I did read the specs page. I was weary about trusting the specs page as I didn't know the source. Either way the Helms manual is extremely helpful. Also I don't believe it lists weights just clearences and tolerances, dissassembly/assembly instructions, diagnostics, etc. It includes everything for the g6. I was a little surprised to find 3 telephone book sized manuals in the box weighing around 15lbs lol. I knew there'd be a lot of info just not that much heh.

My manual confirms a stock deck height of 8.818. The wierd thing is this manual also says rod length is 5.9", but after talking with pauter rods who measured my stocker they gave me a measurement of 5.827 center to center. Hopefully the rest of the specs are all good to go by. No word on wall thickness yet. If anyone needs any other specs listed I will be happy to share.

How about posting the weights of the piston and rod along with some info regarding the VVT function.

[bszopi]

I'm willing to bet your manual will list the exact same specs we already have on the site (see post #12 for link).

[Nightingale]

My manual confirms a stock deck height of 8.818. The wierd thing is this manual also says rod length is 5.9", but after talking with pauter rods who measured my stocker they gave me a measurement of 5.827 center to center. Hopefully the rest of the specs are all good to go by. No word on wall thickness yet. If anyone needs any other specs listed I will be happy to share.

[mrtohil]

Yeah, that'll be corrected after the oven & peening. After that I'm painting it to make it centerfold worthy .

[IsaacHayes]

Interesting that your block was not painted on that one side, its all rusty!

[SappySE107]

Yes they designed some rockers for the 3900 as well. They are close but not compatible.

Scorpion is making us rockers. They are close to the LS1 but not identical or compatible.

Is that compared to the 3900 rockers also? they are different compared to the 3500 rockers and appear to be identical to the LS1 rocker. It was a close call from the picture though.

[SappySE107]

Scorpion is making us rockers. They are close to the LS1 but not identical or compatible.

Take measurements of the rocker arm bolt diameter at the top. The 3900 heads are designed after the LS1 heads, the rocker arms look identical although I suspect the bolts for the LS1 might be a little thicker. Since the pistons are interchangeable bore wise, if the rockers are also that would be another performance hurdle cleared. If they work and I believe they will, the possibility of building a very powerful 60 degree V6 without custom parts will be very easy. Here is a link to some nice LS1 rockers while it lasts;

http://cgi.ebay.com/ebaymotors/Scorpion-5-7-LS1-LS6-Roller-Rocker-Arm-Set-1-7-IE1098_W0QQcmdZViewItemQQ_trksidZp1742Q2em153Q2el1262QQcategoryZ33624QQihZ010QQitemZ200251509456QQtcZphoto

http://cgi.ebay.com/ebaymotors/_Car-Truck-Parts-Accessories__LS1-Comp-Cam-Pro-Magnum-1-75-Rocker-Arms-Camaro-Transam_W0QQitemZ250299223673QQadnZCarQ20Q26Q20TruckQ20PartsQ20Q26Q20AccessoriesQQadiZ2865QQcmdZViewItem?hash=item250299223673&_trkparms=72%3A543%7C39%3A1%7C65%3A12%7C240%3A1318&_trksid=p4506.c0.m245

[bszopi]

http://60degreev6.com/content/3900_Engine_Specifications

I was able to obtain some specs from the school. I have them on hand if you need them. The concern that I have is making a torque plate for this motor to bore it out correctly.
I don't see anything about min. cyl wall thickeness... WHICH MEANS it's okay to have paper thin walls to have max. bore.... Ha!

There is a pretty extensive spec sheet for the motor already available on the forum, it just can't be trusted fully. The rods are not 5.9" as advertised for example.