Preston129

iTrader: (3)

I'm just throwing this out for discussion, because i'm genuinely interested, and I more than likely will do the LS7 conversion but I was thinking this while planning my cam swap:

Since the DOD feature is only on 4 of my cylinders, meaning 8 lifters are likely the DOD-type, what's the value in replacing the other 8 non-DOD lifters with similar non-DOD lifters?

I'm under the impression that each new generation of lifter replaces the older generation, meaning i couldn't go into a GM dealership and leave with an LS1 lifter, I would get whatever new lifter GM is putting in cars (LS7). (I could be wrong on this and stand to be corrected)

I've also heard the LS7 lifters are .050" taller than the DOD lifters, but does this hold true for the other lifters as well? If the lifters i'm putting in are taller than the older ones in my engine then i could understand putting in the other 8 LS7 ones, but if i'm just replacing new parts with newer ones then I might as well save half the price on a full 16 lifter swap.

And for anyone that's already taken the lifters and pushrods out, (iamkeniff comes to mind), are the pushrods on the DOD-lifters a different length than on the non-dod ones?

iamkeniff

iTrader: (16)

no sir they are the same length.
the cam lobes are shorter to allow the longer DOD lifter
the LS7 lifter is a 7k rpm lifter vs a stock lifter of 5900rpm or so
you have to pull the heads anyways...change the lifters.

LS7 lifters an trays an the LS2 wedge damper from SPDC is 181.00 shipped
another 60.00 roughly for the head gaskets
110 for an LS7 valley cover
also need a crank bolt (ARP 33.00)
new head bolts (ARP 110.00)

everyones opinion is different...id rather spend the money now to take care of a GM design that only helps the "average driver"

pm me with any questions ill be glad to help

viciousknid

iTrader: (8)

Don't forget Hardened pushrods. No sense in leaving the stock ones in there and risking malfunction.

Have been doing more reading on this and should probably mention that the Length of the lifter itself isn't longer but the cup sits .060 higher in the lifter than on the previous ls1 style lifters. Which is part of why some will say they are the same length and others will not.

Just felt I'd mention that is all.

iamkeniff

iTrader: (16)

the DOD lifter is longer than a stock lifter

your parts list should consist of this:

Lifters
Lifter trays
LS2 wedge style damper
Head bolts
Head gaskets
hardened push rods
Cam
Valve springs that will handle the new cam
ARP assembly lube for the bolts
Comp Cams assembly lube for the cam, rollers on the lifters

Preston129

iTrader: (3)

Is there an electrical connection on the DOD valley cover (i'm assuming there is to signal the solenoids)? and can you just leave that disconnected without it sending error codes? I will plan on having the DOD removed in the tune as well.

Viciousknid, I meant to type cup, and not general lifter height, thanks for catching that.

I'm planning on going with 7.35" hardened pushrods with the LS7 lifters, does this make sense given the .050" height increase of the lifter cup?

L82gofast

iTrader: (1)

You also need to replace the DOD lifter valley cover with a LS2 unit.

Preston129

iTrader: (3)

Ya i'm planning on doing the full dod kill (lifters, lifter trays, valley cover, p-rods, springs) as well as new cam and associated parts. Just curious if you leave the pigtail hanging from the old valley cover if it will send error codes. Not a big deal since i'm planning on tuning the dod out anyways, just trying to learn as much as i can before tearing into the motor.

iamkeniff

iTrader: (16)

just leave it hanging it wont send a SES code if you turn it off in the tune

what i dont understand is why cant you just use your stop DOD cover when its got o rings to hold the oil pressure. thats the reason for the LS2/7 valley cover is to block the bosses so you dont lose oil pressure.

your running a stock cam with the dod cover even though you turn the dod off so why cant you run the dod cover still? its the same point as a LS2/7 valley cover.

if anyone can explain it past "its what you need to do or you risk
loosing oil pressure" then please do. bc i feel its a wasted 110 on a new cover when the dod cover serves the same purpose

Mrgoodwrench3

The LS2 LS7 valley cover blocks off the oil ports in the engine block. This is necessary when eliminating DOD.

iamkeniff

iTrader: (16)

so does the DOD cover.
my truck didnt lose oil pressure with the dod cover on it after i shut off the DOD.
it serves the same purpose imo unless someone has already tried this an can vouch that you lose oil pressure with normal lifters then imma still feel theres no point in running a LS2/7 valley cover. also you can run a 6.2 valley cover an it doesnt have a vent tube in it