438 inch engine with stock 6.0 block bored .125", 4.100" stroke, 6.200 rods, L92 heads, port work on both sides, carbed intake and undecided on camshaft specs as of right now. It is going in my 93 Z28 (pic on my website www.loughengines.com). I have a th-350 with an 8" 4800 stall, 3.73 gear and 275/60 drag radials. The car has gone 9.65 with a 396 LT1 with AFR heads on 175 hp spray with the stock intake manifold. I plan on picking up about 7 or 8 tenths with the new engine.

 

https://ls1tech.com/forums/dynamometer-results-comparisons/807945-another-l92-package-result.html

 

I plan on building a 39x in a 6.0 truck block. Fully ported L92's, 3.900stroke, 4.02-4.03" bore. GM carb intake, I'll probably start with a dominator because I have one, hydraulic roller, shooting for 12.5:1 with some custom Diamonds, it will go in my 98 Firebird race car but I am going to try keep it a pretty low maintenance combination. Hoping for 650 flywheel horsepower.

 

Sorry, but why is it that you are going 1/2 assed on this build? I mean, no exhaust??? Plus, do yourself the favor and forge the bottom end now, so you don't have to yank it in a year or 2 to do so...

 

lsx block+dragon slayer crank+je pistions-but dont know about rods yet????
427 cube's
l92 heads cnc-manley valves+nextek doubles
soild 264-268 (625-636) comp
jesel rollers
jesel timing belt
external oil pump
gmpp intake with a bit of cleaning inside---+fast/wilson fuel rails
wilson efi carb t/b
60+ pound injectors
13.1 comp
applied or proflow n20 kit-about 150-250 tops of n20
text twin plate
looking @ 650+ na engine
n20-250 spray 850-875 @engine

about a month to go till its ready-can't wait-

 

Don't hold back, tell us what you really think!!

That's a valid question, it all comes down (right now) to having the bucks to do everything I'd like to do. Just the LQx with the better heads will give me a good deal more power than the car has now. At the same time, I'm also going to add a T56 in place of the 4-spd auto that's there now. I don't want to try to "adapt" the current tranny to work w/ the new engine, & I've always felt that a performance car should have 3 pedals, so that eats up some of the funds.

Considering the fact that the car will have more power, it would be irresponsible for me to not address the brakes at the same time (IMHO).

I've just had to balance the available funds against everything I'd like to do, & I just felt that brakes were more important than headers - especially with the only pre-built headers available costing about $800! When time & funds allow, I can bolt headers on (or fab 'em myself, been thinking of going down that road actually...)

If I can find a low-mileage donor engine (I'm firmly holding out for one with < 30k miles), it should last me for several years, unless I go forced induction, or spray the wee out of it, neither of which is in the plans at the moment...

And yeah - I would SO love to spring for a forged/stroked bottom-end!! In fact, I've been turning myself inside out trying to figure out how I could include that too with the money available. But the fact is, this is just my TOY. In the last five years, I think I've put less than 2000 miles on the bloomin' thing. (There were other factors involved as well.) While I enjoy doing cruises, & tearing up the mountain twisties around here, "real life" has to take priority for me.

DAMMIT!

 

Damn I think you are the first car inthusiast that actually has a good head on your sholders. Lmao.....

 

haha. you can 12:1 on pump gas, but have fun getting a tune on that motor that will make comparable hp safely.

 

E85 is actually easier to tune if you know what you are doing.
Is is much less sensitive about being overly rich, so it is actually easier for a DIY
tuner to start way rich and pull fuel and/or add timing a little at a time.
IMHO it is safer that pump 93 by far for a higher HP build.

 

all i have to say is patrick g's 347 500rwhp with 11.92:1 screaming to high hell think thats safe enough on pump gas.

 

yes, i agree, he has a badass setup that puts down stellar numbers. however, i am a poor boy. i do not have the resources and money to spend on a motor like he did. i can make more power using an alternative fuel. what's the big deal? i see an opportunity to easily run 12:1+ compression with no worry of where to get fuel. why not? it's going to cost the same (probably less in the long run honestly) for me to use e85, and i will make more power, safer.

 

sounds tough bro-

 

I agree on the exhaust being too expensive. Just band-clamp your Y-pipe up so you can yank it when needed. That way you'll be running open headers when free exhaust flow is needed.

 

Thanks for the compliment, I ordered more parts today. Race season is coming up fast and I have a lot more work to do!
Mike

 

what does "all-bore" mean?

 

It means he got his extra cubes from adding bore, but keeping stock stroke.

 

From Canadian Perf's website

LSX Engine Combinations

Stroke Bore

347ci Alum LS1 3.622 x 3.905

364ci Alum LS2 3.622 x 4.000

370ci Iron 6.0L 3.622 x 4.030

383ci Alum LS6 4.000 x 3.905

393ci Alum LS6 4.100 x 3.905

396ci Alum LS6 4.125 x 3.905

402ci Alum LS2 4.000 x 4.000
403ci Alum LS2 4.000 x 4.005

408ci Iron 6.0L 4.000 x 4.030

412ci Alum LS2 4.100 x 4.005

415ci Alum LS2 4.125 x 4.005

421ci Iron 6.0L 4.125 x 4.030

427ci Alum LS7 4.000 x 4.125 NEW!

427ci Warhawk 4.000 x 4.125 COMING SOON!

427ci Iron 6.0L 4.125 x 4.060

427ci DrySleeve LS2 4.000 x 4.125

434ci DrySleeve LS2 4.000 x 4.155

441ci Alum LS7 4.125 x 4.125 NEW!

441ci Warhawk 4.125 x 4.125 COMING SOON!

441ci DrySleeve LS2 4.125 x 4.125

441ci C5R Block 4.125 x 4.125

447ci DrySleeve LS2 4.125 x 4.155

454ci DrySleeve LS2 4.185 x 4.155

454ci Warhawk 4.250 x 4.125 COMING SOON!

454ci C5R Block 4.250 x 4.125

461ci DrySleeve LS2 4.250 x 4.155

461ci Warhawk 4.250 x 4.155 COMING SOON!

481ci Warhawk 4.500 x 4.125 COMING SOON!

488ci Warhawk 4.500 x 4.155 COMING SOON!


These are some of the combo's but not all. Rumor is that I'm getting a 457 built from a LS7.

 

see sig... going in a 03 suburban

 

Good numbers.

4.000 x 4.000 is a 402.. .005 over is a 403..

 

Check sig for info.