mechanix565

soo im in the process of building a budget nitrous lq4 for a project of mine and my tuner is telling me the setup im building has 600 rwhp potential on bottle so i want to upgrade the rods but keep the factory pistons. its an 02 lq4 so its got the old style rods. i heard scat makes a stock replacement rod for press fit pins but all i can find are 6.100's and i think that wont work because it will cause PTV clearance issues with my .621 lift cam and also what is the wrist pin size on the press fit pistons? i was told use the scat i beams because they are the same weight as the "early" press fit rods but stronger than the floating pin rods so i dont have to have the assembly re balanced. let me know guys a link would be awesome lol

mechanix565

http://www.summitracing.com/parts/SCA-26100944P/

this is what im finding. are they a direct factory bolt in?

93Z2871805

iTrader: (5)

Personally, if I made any changes to the rotating assembly, I'd have it balanced (even OEM to OEM parts). You can pick up a set of used LQ4 2004-up rods and pistons (floating style) for dirt cheap.

mechanix565

ya only thing with that is the oem lq9 rods are heavier and im not trying to add weight. the scat rods are said to be the same weight and stronger. plus if i get the lq9 rods i need floating pistons and pins.

93Z2871805

iTrader: (5)

You could also use the 04-up LQ9/LS2 rods/pistons if you'd like to bump the compression.

93Z2871805

iTrader: (5)

LQ9 and LQ4 rods are the same. The only change is the pistons between the 2. However, floating compared to press-fit may differ in weight, I'm not sure.

mechanix565

ya floating rod is heavier than press rod thats why im trying to get it to the same weight as possible. i dont mind spending the 300 on the scat rods if they are direct bolt in. have people used 6.100 rods on the piston/deckheigt with a high lift cam?

mechanix565

also factory pistons are cast right not Hypereutectic if so a cheap set of Hypereutectic pistons might be in the works

93Z2871805

iTrader: (5)

Stock is 6.098 and if your cam can run on that without PTV clearance issues, I don't see the extra .002 being a make-or-break thing.

mechanix565

stock pin size is either .944 or .927 not sure which but i want to stay press fit and not floating. im going to use the scat rods either way working on piston choice right now. dont need forged ive made big power on cast pistons before i want to go Hypereutectic
the cam im running was designed for stock internal ls1s and they have flat tops which im going to get if i grab pistons. so ya i think it will clear.

93Z2871805

iTrader: (5)

Being totally honest, these engines are pretty tough (just check out Car Craft's 1200 hp 4.8 with a bone-stock bottom end). GM trusted the LSA at 556 hp with the bottom end being made from the same material and design as every other (floating style though) LS (not titanium and forged like the LS9 or LS7). Just something to consider.

mechanix565

sooo im looking at these pistons
http://www.summitracing.com/parts/SLP-H1129CT/

and these connecting rods
http://www.coasthigh.com/SCAT-4340-I...0-944p-716.htm

will they work together using?
-oem mls headgasket
-oem crank
-.621 lift cam
-stock deck 317 heads w/ oversized valves

if they will work then awesome. if not any links to a setup that will. not trying to spend more than around 600.00 tho

mechanix565

oh ya man i know ive made 700 on a bone stock 01 lq4 but it was a track car only this is going to be a daily that gets beat alot and i just want it to stay together ya know. 500 is a small price to pay for peace of mind lol only paid 700 for the complete setup with all accesories and wiring so i have a little wiggle room.

93Z2871805

iTrader: (5)

That gives you a compression height of 9.236 and puts you .004 down bore (on a true 9.24 deck), I don't see why it wont work, however I think you'll need to have it balanced. What's the duration on that cam?

93Z2871805

iTrader: (5)

I hear ya, I was just looking out for cost effectiveness here, lol. That is a pretty good deal considering mine was $1k.

mechanix565

tick polluter cam-24x/24x (.61x"/.61x") 112LSA)

will the pin size on the rods work with those pistons or stock pistons? im not having luck at figuring this out

the pistons say pin diameter .943 and the rods say .944 is that .001 clearance alright? and ya if im doing pistons to ill have it balanced

mechanix565

hmmmmm lq9 rods 100 bucks for a set of 8.... might be going that route if i can find some cheap pistons and pins. if anyones got stock lq9/ls2 pistons/rods let me know ill buy them that way i can put the money elsewhere

93Z2871805

iTrader: (5)

Now you're seeing the light, lol. Go fast cheap.

mechanix565

thats always been my way, i was trying to turn over a new leaf but 200 vs 600 hmmm easy choice then i can use the 400 on an ls2 intake and some injectors lol

RezinTexas

I've got a set from an '04 5.3 LM7, anyone know if they are the same as LQ9's? I'd let them go for really cheap.