LSxChevelle

iTrader: (4)

So I want to make sure I'm not missing anything...

Now why I'm doing what I'm doing...I have the LQ4 block, LS7 crank, full set of LS7 titanium rods.

As far as 24x conversion...I have 2 junk 24x cranks, plenty of Gen III covers, no Gen IV's, have Gen III cam sensor, and MSD 6LS is slightly cheaper (about a wash with reluctor swap charge) for Gen III.

So now I can run a spacer or cut snout. Why one over other or does it make a difference?

I will be going with a custom made piston to the LS7 specs other than bore size.

This will most likely go into a Fox Mustang with Vic Jr. or possibly sell if I can make a buck.

LSxChevelle

iTrader: (4)

Nada?

00Vette04GTO

I have no information for you, but I am sure interested in this build... New to the GM world, so maybe people do this all the time - but I haven't seen it yet.

What displacement will this result in?
What bore size are you going with?
What heads are you going to run?

LSxChevelle

iTrader: (4)

Block is being Sonic tested right now to figure out max safe bore. Most LQ4/LQ9's can got .080" for N/A applications. If that's the case I will go .070" for 4.070" bore and 4" stroke. 416 CI...

In the rare event that I can possibly go all the way to .125" I can run the stock LS7 pistons! Probably not likely...

Not sure on heads yet. Probably just GM CNC LS3 heads. $1200/pr

redtan

iTrader: (5)

I'm guessing a non 4.125" piston will require it to be completely custom in order to fit the Ti rods correct?

LSxChevelle

iTrader: (4)

Correct, different pin height and pin size.

bww3588

iTrader: (49)

What's the length on the ls7 rods? And pin size? I've never done any research on the ls7 as I've never had enough extra money to afford parts for it.

I do know the ls7 is a different animal in the ls world.

KCS

iTrader: (20)

6.067" length and .925" pin.

LSxChevelle

iTrader: (4)

I bought a good crank, set of rods, 7 good pistons, stock cam, lifters, valley cover, dry sump pan, oil pump, and front/rear cover for $700. Then bought a stock oil tank and lines for $300.

I just got $660 for tank and pan after shipping, $80 for cam, and using lifters in my budget 5.3 build.

So realistically I'm in the crack and rods (plus valley cover with pcv) for like $210. (Putting a used value of $50 on lifters). And I'll still have some misc pieces.

Jason

JakeFusion

iTrader: (7)

I'd definitely use the rods and crank. The crank can be machined to fit the LQ4.

I'd look at some custom Wiseco pistons tho to fit the LS7 rods and 4" crank for whatever bore you end up with on the LQ4. Figure out your heads now so when you order, Wiseco can put the correct valve pockets in the pistons...

LSxChevelle

iTrader: (4)

Machined? Don't they have same main size? I know snout is longer but that's an easy fix.

I may just do CNC LS3 heads budget wise. $1200/pr is already more than my shortblock lol

Bilster

iTrader: (21)

I think I got your pistons for you!! Assuming your going to do the smart thing and go with a 4.030" bore, my math shows that you need a piston with a compression height of 1.183" using a 4" stroke and the 6.067" length rod. With a .925" pin. Check these pistons:

http://www.ebay.com/itm/Wiseco-ProTru-FORD-327-Forged-Pistons-set-4-030-5cc-WISPT070H3-1-1755-CH-/380688153686?pt=Motors_Car_Truck_Parts_Accessories&hash=item58a2c83c56&vxp=mtr
You will have to probably flycut valve clearance and deck the block a mere .007" to get zero deck height.

dr_whigham

iTrader: (49)

HKE has done this set up before. Might call them strictly for advice, and eliminate the guess work and "uh ohs"

LSxChevelle

iTrader: (4)

Found that elsewhere...

Those are .0025" taller. So assuming the above is correct and the LS7 has zero out/in hole then these would put me at .0025" out of hole assumes perfect 9.240" deck height. Hmm

Great find!!

bww3588

iTrader: (49)

May not be as great as you think...

What is the pin offset on the ford pistons?
Also, the valve reliefs will be on the wrong sides of the piston as ford starts with valve arrangement opposite of GM. Ford starts with the intake valve leading on the front of the bank as opposed to the exhaust like GM.

Bilster

iTrader: (21)

True...So it would all depend on the pin offset. If there is a zero offset, you might be fine.

bww3588

iTrader: (49)

and the placement of the valve reliefs. IMO, it would be easier to find a piston to fit the bore and whatever heads you're using (LS3 or cathedral) and have them put a custom CD on it with the correct wrist pin.

Also, I believe the Ford engines have a different valve angle as well, which would further complicate the valve relief issue.

JakeFusion

iTrader: (7)

I meant machining the snout.

Wiseco custom pistons + rings are like $850.

You'd still be into a lightweight forged stroker assembly for like $1500 out of pocket + whatever you sold off to balance it out (including the pistons).

KCS

iTrader: (20)

You may need to address the skirt profile as well. Since the 6.067" rods are shorter, the pistons will end up further down in the cylinder at BDC than the 6.1"/6.125" that they're designed for. Probably comparable position to a 4.10"/4.125" stroke.

ASSJACK4000

i was quoted $1000 straight from wiseco for a ls7 rod/ls1 bore pistons. big coin