Has anyone stroked their Vortec lately?

[wingn69]

I linked up with him here in Germany and I am telling you that Hummer rocks. He stopped by my office with it and I felt him before I saw him in the parking lot that motor was screaming let me race open me up. then he park next to my none lift truck with his 6 to 8 in lift kit, yeah that was not funny.

[guruerror]

http://www.youtube.com/watch?v=ZoiIMXdhig4
http://www.youtube.com/watch?v=GiqfVkxXVo0
http://www.youtube.com/watch?v=Ez5Mxgzt6SE

Did he mention how much $$ he through at the motor? Or anything about MPG?

In his first video for a fair amount of his acceleration he stays around 16-17 L/100km...according the a L/100km to MPG converter I found on the Internet that's about 13.5 MPG. Took me a while to grasp that on his gauge (using L/100km) HIGHER numbers reflect WORSE mileage than lower numbers.

I'd like to know what his average L/100kms is under normal driving conditions, and not going balls out on the throttle. Mine averages around 12 MPG, but my truck definitely doesn't haul ass like his.

[wingn69]

I will have to see if I can bring him up on the net again havent seen him in a few weeks busy man. I do know his Dad helped build the motor from there family shop in the states.

[EuroHummer]

I am alive and well in Kabul, Afghanistan. My stroked 408 is sadly stored in Germany, awaiting a transmission, rear suspension, gear change (4.10 to 4.56) in preparation for a trip from England to Transylvania in September, 2011. I have a complete price list for the parts, as well as parts numbers. I have to search to find it. Here is a link to the article that got me going-http://www.gmhightechperformance.com...ild/index.htmlhttp://www.gmhightechperformance.com...ild/index.htmlhttp://www.gmhightechperformance.com...get/index.html

1. Performance gains- I have not had it dyno tested.
2. Torque gains/losses. Same as above....
3. MPG...no major loss. Still getting 10-12 mpg with 37X12.5 tires, FABTECH lift, and the engine mods.
4. Feel...sound..Sounds awesome with the magnaflows and headers. Not to loud, but turns heads for sure. Feels good, and with the new lower gears, it will really be a neck snapper.
5. Also...how many miles (and what type of miles) have you put on your truck since the stroke. Not many miles yet. Drive it on the autobahn for a few thousand miles, and off road a few times. I drove it really hard off road (up to 6500 rpm) and tried to break something....the tranny has held out so far, but is going to be replaced by a built unit from CK trannys. I just dont trust it on my long trip next year.
6. Problems...weaknesses...things to consider-I went with the FAST LSXRT and glad I did. Its over a grand, but is highly rated for HP increases over the entire RPM range. It also allows up to a 102mm TB. I have the 90mm from an LS7 Vette. Did not want to kill any low end power with the monster 102. That is a drag racing item. I had a cam custom ground at Schneider Racing Cams in California. Call up Kevin Cantrell, tell him your goals and desires, and he will grind you a custom cam. I opted for a mild low end cam that would pass emissions. You can get as wild as you want. I cracked an aluminum rocker arm, and had to go to stainless steel rockers. I am wishing I had used the comp cams high rpm hydraulic lifters. I may change them out and use some trick ceramic pushrods (light as hell and less flex than chrome moly). The engine should be pretty much bulletproof with the forged crank, rods and pistons. I dont like anything that is cast if I can avoid it. Just one of my pet peeves. I love the engine, and if I get crazy, I can bolt on a pro charger and put out at least 800-850 HP, considering it should be around 500 now.

[Hellz]

how much do you think you spent on the project so far?

and really? your getting 12 mpg? on a 03 model? damn..

i want to reach the 500 hp mark, but just not sure how much $$$ i want to throw at the stock motor to do it. thats without doing any charger. just straight hp.

i know the tranny will need a rebuild/replaced. i have heard of people swapping the heads and manifold on the LQ4 for L92 heads and manifold and getting 450ish to 500 hp from that alone. about a $1200 investment.

[EuroHummer]

450-500 with only heads and intake....hmmmmmm. I have the best intake available for the engine, a much lager throttle body, higher lift/duration cam, headers, exhaust, etc. but the stock 317 heads. I don't believe the stock cam will put out 450-500 hp. I would have to see the dyno test on that. If thats the case, then my 408 would be putting out much more than that. I have to get it on a dyno, but have to find one in Germany. I will dig out my receipts and see what it cost.

[Hellz]

Originally Posted by EuroHummer

450-500 with only heads and intake....hmmmmmm. I have the best intake available for the engine, a much lager throttle body, higher lift/duration cam, headers, exhaust, etc. but the stock 317 heads. I don't believe the stock cam will put out 450-500 hp. I would have to see the dyno test on that. If thats the case, then my 408 would be putting out much more than that. I have to get it on a dyno, but have to find one in Germany. I will dig out my receipts and see what it cost.

sorry i didnt add in that also a decent cam is also required..

there are multiple articles out there for this same exact setup ( Lq4 upgraded with L92 heads, manifold, cam)

the price ranges vary depending on what you replace.. but there are builds for 550 rwhp for about $4.5k