I'm pretty sure I'm going LSX on my next motor and have looked until my sight went blurry.

Here's what I come up with on an econo buld 550+hp...What you think ???

LQ4 or 9 (ie: cheap to buy) overbore .020-.030 ? (unsure whats standard on an LSmotor
Stock crank and rods NEW pistons
11:1-11.5:1 compression
L92 heads (may need shaved)
Cam....thinking 230/240 on a 106 or 108 LSA

Give me your thoughts.

 

If you are going that far into it, I would probably get good rods too.

 

Just get a low mile ly6. They come with the l92 heads already, and all you need is a cam, springs, and maybe mill the heads for some squeeze.
That's what I run, but I haven't milled my heads.... Yet

 

Ly6 and mill the heads .030 and ls2 gaskets
Or
Lq4 and mill the heads .030 and ls2 gaskets

 

What kind of money you looking to spend exactly?

 

I'm trying to keep it low as possible but not sacrifice longevity.
I thought the rods were fine w/ ARP bolts ?
I guess it could be stroked too ? (cheap and rotating assembly don't go well)
I am also sticking with a carb set-up.

The car (68 Camaro) is not a daily driver and it may see 1000 miles a year at most. I do like to race it (drag race).
Car specs...
3400ish w/ driver (may be a little less?)
4.10 spool, 35 spline axles, c-clip eliminators
4500 9.5" stall
th350 w/ shift kit (auto/manual valve body)
275/60/15 MT Drag Radials

 

Amazing you can talk 550+ and econo in the same sentence.

Out of curiosity what intake and carb size were you thinking?

 

They sell a 60 iron block for 3400? i think, short block, forged, 427 cubes, i dont know if that is in budget, but it will deliver.

 

I'm doing the same build pretty much and have a 402 lq4 with 11.5:1 comp stage 3 L92s mast intake maifold pro systems 1000cfm carb and thunder racing custom cam 24x/25x on a 112 llooking for 550rwhp plus, it's almost done so I'll be posting numbers this week oh yea no ac or power steering with electric wp, good luck

 

They ???

 

I have a 750 Mighty Demon (flows 930ish CFM) at the moment on a 406 SBC (old school) and not set on any one intake yet.

As for "econo" (everyone has their own limits) but I see guys here (and other sites) doing a cam,head,and intake on stock block LSX motors and in the 10's (some in the 9's)....550+ sounds do-able on a budget. I just want a step or three up for piece of mind.

I could do a Dart 400" in the 550+ range for $6 or $7 K.

I called about a stock rebuild and was told approximately $2K just for decking (if needed),new bearings,gaskets,ARP bolts,resize the rods,and assembly (I'm sure I missed something)

Remember the install parts will be about 1000-1500 as I will buy the kit. I could piece together and save $$$ but I think a kit would be quick and easy.

 

+1 on the LY6 idea^^^. You can't hardly beat picking up a cheap motor with the L92 heads already installed. I paid $1800 for mine complete with less than 3000 miles on it. My longblock is stock except for a cam, springs, pushrods and aftermarket rod bolts for added RPM insurance. It won't be easy to achieve the CR you're looking for with the stock dished LY6 pistons, but you could easily get it to 10.5:1 or so with a .030 mill and thinner .040 gaskets. Stock CR is 9.67:1 on a LY6.

 

doug, if you get a low mile engine, you dont need to do a rebuild, all except the head gaskets are re-usable, and there is no need to do any machine work except maybe head milling if wanted. ARP replacement bolts are a real cost. - if your really want to spend money, you could buy stock bore flat top pistons to fit the low mile LY6 to get you up to 11.5:1(or more) with a small head mill job.
I plan to take a BIG cut out of my L92 heads, and mill intake to match, to get my stock piston LY6 up to the 10.8-11:1 range. I may replace the rod bolts for ***** and giggles, but i've had no trouble with the oem rodbolts up to 7200 so far.
a 6 quart oil pan is a good investment I'm told, when 7K+ RPMs are in store. My next purchase for my 6.0 will be a moroso pan, I should not have wasted the time modding the stock pan, as I am liking the high rev nature of this thing, with more rpm in the future!
Barrett
PS L96 is the new name for 09 and newer 6.0 w/ L92 heads installed oem. Look at the 2500series trucks at the salvage yards.
PSS stay away from the AFM equiped engines unless you get a smoking deal, as you need to replace the lifters, and do a couple other small things.....

 

HHHhhhmmmmm.... I'll have to take a look-see Thanks.

DISPLACEMENT: 364 ci
BLOCK: Cast iron
HEADS: Aluminum 15-degree rectangle port
BORE/STROKE: 4.000 x 3.622
COMPRESSION: 9.67:1
OUTPUT: 352 hp and 382 lb-ft
WHAT IT’S IN: 3/4-ton '07+ Silverado, Sierra, Suburban, and Yukon

 

Sorry, 3600$

https://ls1tech.com/forums/sponsor-s...er-3599-a.html

 

Thanks.

and a LY6 @ 9.67:1 compression and mill the heads .0?? per cc (.030 seems like alot)... and the heads are ??? cc from the factory ?

 

L92/LS3 heads are +/- 70cc from factory. Dont sweat cutting .030", I plan a .050" cut. with that, there will be mild miss alignment problems, but not hard to deal with.......

 

IIRC, a good rule of thumb on most LS chamber designs is -1cc for every .006 cut, so a .030 cut SHOULD be -5cc. As 3pedals said, you're starting around 70ccs with L92s so a .030 cut should get you to 65cc. Add a .040 gasket and that would put an LY6 around 10.5:1 SCR.

 

Got it.

Now IF I cut it .030, AND could get the correct thickness MLS gasket I could see about 10.6:1 which I could live with I guess.

Just read an article on a LQ4 with a big cam and L92 heads making 550+HP (was a magazine article so take it for what its worth)

 

And how to tell an LY6 if it's already pulled ? (from the outside view)