V2Rocket

isnt the vortec the 5.3?

alex

Yeah what about those truck engines, that's a question I've been meaning to ask for a while. I love the 5.3 in my moms pick up.

V2Rocket

wiki says there were some aluminum block 5.3 engines in trailblazers, envoys and the SSR which were good for just under 300hp..says there was a HO version which was 310hp and like 335 lbft and only came in 4wd trucks like the silverado 4x4 1500.

seems if you dont mind the iron weight pretty much any of those engines will work nicely, lord knows how many chevy/gmc trucks and suvs are out there. 300hp/tq for cheap is always a nice thing to hear.

anders44

imho lt'1 is only worth it if you don't track your car.

ls1 fo shizzle. or.. ls3 actually vrooom cant wait to get mine done

Dougs951

Or maybe a nice shiney new LS9

alex

I meant are the truck engines going to work in my car with the above BH or are there any fundamental differences that would preclude this?

JimV8

My LSx is going to the shop and because I intend to track the car I am looking for reliability to go with power mods we are doing. Those include LS6 intake manifold, Z06 Heads ( ported) Z06 cam, polished throttle body and de-screen MAF. Headers are modified 99 corvette to SLP high flow cats. In the engine we going with bigger valve springs, pistons and rods, and the oil pump will be ported with oil pressure increased. Engine work will cost $5K. Pricey but I want 7500 redline and want to go there alot. Flywheel is a light fidanza going to a spec 2 clutch with a kevlar disc. I got a good deal on both of those. The real beauty of these power plants is the OBD2 computer that has about 16 pages of tunable inputs.

V2Rocket

wow jim thats gonna be a bunch of fun, 7500 rpm

which Z06 cam are you using? off the 405HP or the 505?

Potomac-Greg

Dimi:

Well, I already upset/surprise plenty of 911 owners with the 2.5!

I'm a realist, though. There's no way I could expect to have a clean, simple LSx swap without a world of little glitches, costs and delays. I figure I'll keep working on my driving; and if I can get the suspension optimized, I can just floor the gas out of the pits and never lift until the run session is done!

I can't wait for VIR. I want to see if I can go flat out from turn 5 to turn 10. (Safely, of course.)

944-LT1

153BigBlock, click on the following.
As for the 5.3 or LM7 engine.... http://www.porschehybrids.com/php/vi...2842&hilit=LM7

Great engine. It can be bolted up to the QT BH as well. No problem there as far as I know it still shares the same mounting as the LS. In fact, the intake is just swapped to an LS intake.

Great thing about this engine is thats its flex fuel as well as highly upgradeable!!!

Roman. I PM'd you.

V2Rocket

arent the vortecs the same basic block casting as a LSx with differences in bore/stroke and coolant etc?

944-LT1

All have the same BH mounting patterns. But, cast? Depending on which you have. Some are aluminum some are cast iron. Some are HUGE 6.2L and some are small 4.8L like the cayenne V8. So yeah, most are just an LS1/2/6/7/9/x but with torque being the primary design; for towing....these are truck engines! With a swap of this and that, you make huge power for cheap. The going rate for a pull-out LQ/M/Y/etc. is equal to or less than 1K. Lots are found for around 600 bucks.

I see you like wikipedia so try this...http://en.wikipedia.org/wiki/GM_Vortec_engine

CurtP

I'd want to do the 5.4L - 345hp. At that point it would be about keeping it all Porsche, not to see who make the most HP. It wouldn't matter which engine I'd use (LTx, LSx or a Porsche V8), I'd keep it stock - well, maybe mildly built. I'd want it to be a good daily driver. The LT1 in my Formula got a little out of hand (396ci with a cam that isn't happy about idling). It's not that I don't like LSx motors; I just don't care for the exhaust note. I'd have to find an exhaust system that could keep it quiet.

A nice thing about using a Gen II/III engine (and something I miss) is they're dead reliable if kept mild. Tune it safe, keep the oil changed and there's not much maintenance outside of the occasional spark plug change. If I keep this up, I'll end up talking myself into a conversion


I found the black badges on eBay, but the sellers price was too high. I looked everywhere trying to find them without success, then noticed that he had a picture of the back of the emblem. The part number was a standard badge, so I bead blasted mine and painted it with Blitz Black (John Deere tractor paint). Turned out well. I'm trying to decide if I want to paint the crests on the center caps black too - I think it may be too much.

JimV8

Thats a good Q, and I don't know, but it likely the 405. I'm on LS tech and bought a lot of stuff from those guys, cam and heads included.

UncleMaz

Thanks LT. Guy wants 1k for everything. I will check out the boards per your suggestion. Michael