1nasty86

iTrader: (63)

need to know numbers on a stock bottom end 5.3??? didnt bother replacing the rod bolts just did the arp pro series head bolts.... weiand intake, 02 ls6 cam, oh... and the turbo is a precision t67 . through a 4l60e with a 3600 vig. i was told around 400-500 on my 8lb spring??? i was also told over 500. i think thats a bit excessive tho.

pwrtrip75

iTrader: (8)

Might be over 500 at the crank. Dont see why not.

nastychevelle

iTrader: (7)

why not run 15#'s and get like 600hp? many people have done it on the stock bottom end

pwrtrip75

iTrader: (8)

640 whp w/ a stock bottom end 5.3 no fancy head gaskets, stock rod bolts, stock head bolts. Going on its 3rd year running strong.,....never a problem.

NemeSS

iTrader: (127)

what yr is your 5.3?
using 317 heads iirc?

1nasty86

iTrader: (63)

all i have to say is WOW..... lol i dont think my trans or 10 bolt would handle what horse power im going to be making... im 95% sure its a 4l60e but its out of a 2003 2500 express van? still with the same 5.3. but i friend has a 4l60e and his doesnt have the drain so i was pondering if it was a 4l65e?

bjamick

iTrader: (31)

Stock rod bolts? Your nuttier than squirrel ****. Did you even replace bearings?

pwrtrip75

iTrader: (8)

I got it from LKQ on ebay complete for $500. about 4 years ago. Yes I put 317 heads on it, ported them and also put a new oil pump in, and swapped cams. Never touched the rod bolts, bearings or any of the rotating assembly. I think it is a 2000.

I bought it as a mock up block and to practice tuning on. I didnt expect it last more than a month. But its proven to be very strong and reliable.

Im building a 421 for my Nova now and am putting this 5.3 as is into my TransAm and going to beat it some more. Its running 15psi + a 50 shot of spray, timing i think is around 18 and AFRs are 11.4-11.6:1 I havnt touched the tune in 3 years. Ive never tried to get anything more out of it, as I kind of suspect it is at its limits and anymore would probably be the end of it.

NemeSS

iTrader: (127)

sounds like its held its own under 15+psi

1BAD_LS1

iTrader: (36)

how the hell does a stock bottom end 5.3 hold at 600 HP with 15psi? my ls1 broke at 6psi!

must be a freak motor or something ....

1nasty86

iTrader: (63)

well i was told the pistons hold it better because they are dished and have a little extra "meat" around the outside of the piston, where a flat top ls1 doesnt

1BAD_LS1

iTrader: (36)

Guess that makes sense.... so this has me curious, maybee i should buy a cheap 5.3 and throw some 317's on it and run it at like 10psi while i save for a forged 370 or 408.....

$500-800 for 5.3..... 317 heads $200..... ls6 cam $120...... hardened pushrods $110.... I already have valve springs $0

$1230 for a fun little motor to run for the next year or so while i build my forged motor......

jfg455

iTrader: (5)

the HP calaulator says forcedinductions stock 5.3 w/T70 turbo is 680 crank HP. That is at 16# 15* timing, pump gas and meth injection. The motor is stock except for a 04 Zo6 cam and springs. 130K miles on it. We did crack a piston skirt but that was a 1/8th tank of fuel and it uncovered the pump on a launch. $40 worth of ebay pistons (stock ) and used rings and it is off and running again. The truck runs 11.90 @121 wieghing 4400 lbs. Plug that number in at sea level and thats what you get. We are going to dyno it soon just to back up the numbers.

pwrtrip75

iTrader: (8)

The tune. Also the GT45 is big and kinda laggy but since its not working very hard I think on a full pass my IATs are pretty cool, that helps im sure.

1BAD_LS1

iTrader: (36)

You guys are crazy and making crazy numbers! cant decide on 5.3 or 6.0 people seem to be making more power with the stock shortblocks safer than the 5.7's???? 6.0 is more cubes and about the same cost as a pullout 5.3.....

now im thinking about a 6.0 with ls6 cam/springs/pushrods and 10psi...... about the same price but seems like you could make the power safer.

what do you think?

1nasty86

iTrader: (63)

id get the low compression lq4(i think its an lq4 thats low comp.) but anyway id get the low comp. 6.0, arp rod bolts, arp pro series head bolts, 02 ls6 cam, pushrods, springs and 12lbs and let it eat!

pwrtrip75

iTrader: (8)

You know if your only looking for around 600hp, a 4.8 , 5.3, I see on ebay from LKQ for like $250. in some areas, those would work fine. That little amount of cubic inch difference i dont think makes much of a difference. a smaller diameter piston will have more structural integrity than its opposite. Small cubes work just fine and are easier on parts. Plenty of buick 3.8's flying. and other smaller boosted engines. Boost is the replacement for displacement.

1nasty86

iTrader: (63)

so true!!!

digitalsolo

iTrader: (24)

I went 12.3 @ 112 mph on a WAY early shutoff and a 2.0 60' time in the RX7. 5 psi shakedown pass, and only my 3rd pass ever in the car.

Car was making ~500 RWHP at the time. I ended up losing a bearing, though it wasn't boost related.

1BAD_LS1

iTrader: (36)

Decided on the 5.3!!!! have a few questions though and i want to keep this as budget as possible!

1)Should i get 317 heads or just use my 241's
2)Should i get an ls6 cam or reuse my 227/231 614 617 112+2
3) Do i really need ARP Head/Rod bolts?
4) How much boost should i be looking to run with my FMIC no meth?

If i reuse everything off the ls1 i could do the 5.3L for $600!

Thanks!

Blaine