LQ4 Build

[sierraman]

it's cool man. what about the fuel system?

should i stick with my factory pump and injectorys or upgrade to like a walbro 255 and flex fuel injectors, or should i upgrade to something a little bigger?

[skeet]

it's cool man. what about the fuel system?

will a walbro 255 and flex fuel injectors be enough, or should i upgrade to something a little bigger?

dunno about flexfuel, mines return style, shouldnt be much of a difference? but a walbro is all i run along with many others with NA setups, not i will have to step it up when i go nitrous, also i'm using 42 # injectors, so are your plans are to keep the block stock? or you gonna do any boring maybea bigger bore size?

[txarkitekt]

P&P heads come with Patriot dual springs rated at .650 lift, 375 open pressure Yup
heads milled .035-.040 with a 66-69cc chamber Yup..might as well get nice valve job done as well
Lingenfelter GT2-3 cam - 207/220 .571/.578 118.5 Too small (234/236 .585/.590 112+2 LSA)
Comp non-adjustable timing set - 3153KT Yup
Crank bolt - GM # 12557840 Yup
Comp hardend 7.400" pushrods - 7955-16 Length dependent on how much you mill the heads
GMPP LS6 springs rated at .580 lift Go with the PRCs
Walbro 255gph - GSS341 Yup
GMPP Lifters - 12499225 Yup
GMPP High Performance Lifters, rated at 9,000 rpms? Not needed.
GM Head Bolt Kit, 04 & Later Go ARP

Added:ARP head bolts, 04 & later - 134-3610 Oh, gotchya.
ARP header bolts - 434-1301 Yup
ARP cam retainer plate - 134-1002 Yup
ARP cam sprocket - 134-1003 Yup

anybody got the pn's for the correct rod bolts, crank, and main cap bolts?
should i upgrade to some flex fuel injectors that are rated at 34# instead of the stocker's that are 26#?

ARP Rod Bolts 134-6006. The regular GM crank bolt is fine. But if you want ARP: 234-2503. Mains are 234-5608.

go ARP head bolts imo. better to have to tq them down twice vs tq it then turn it 90* then another 90* or some crap....

LOL. True dat.

what is the limit on milling the heads without having to worry about piston to valve clearance with dished pistons?

Just don't go any higher than your planned .035 - .040.

...should i stick with my factory pump and injectorys or upgrade to like a walbro 255 and flex fuel injectors, or should i upgrade to something a little bigger?

If you are gunna be running the newly built motor and the mods, new injectors will be needed over your stock 5.3L injectors. Flex Fuel injectors are rated at 34 lbs per hr. They MIGHT do it.

The fuel pump should be able to keep up...for now. Leave it be...and if you aren't getting the fuel you need--then go with the Walbro.