Oliver SBC rods??
Thread Starter
Launching!
Joined: Jun 2010
Posts: 255
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From: Alberta, Canada
Oliver SBC rods?? ok, I am sure this has been asked before, but can you use SBC connecting rods in an ls engine?? I have a set of Oliver 6.3'' rods for sbc, and I would like to use them. I'm hoping they would work in a destroker application using shelf pistons. LQ4 block, 4.8 crank (3.262 inches) and 1.3 comp ht. pistons give me a deck height of 9.231 inches. 9.235 inches with 1.304 comp ht. These rods are 1400 bucks to buy new, and I got them for $350 off ebay. So I would like to use them, and I'm not really interested in the SBC anymore. My machinist checked them out and said they are A-ok. Any input would be appreciated! Thanks.
I am not going to say yes or no, but i will say the rod journals on the 4.8 crank are 2.1" and if they are a SBC rod they should have a 2.1" big end. But, i dont know if the width is different on a SBC rod compared to a LS rod. Now i read somewhere that the LQ4's have a 9.230" deck height. So if the sum of your parts (crank throw + rod length + compression height) gives you 9.235" and you use a .051 head gasket you would get around .046" quench. Depending on the bore you plan on using i would pick up a .045" thick gasket to get right at .040" quench. You want the tightest quench you can reliably get.
Edit just found this:
Edit just found this:
Last edited by nastychevelle; Jul 27, 2011 at 05:06 PM.
Thread Starter
Launching!
Joined: Jun 2010
Posts: 255
Likes: 1
From: Alberta, Canada
yeah, you are thinking along the same lines as me. I dont want to put together another engine without optimising quench (.030- .040). I was pretty sure the big end matched in diameter, and most of weisco's pistons are made with a .927 pin which also matches. Big end width is another story. I don't know.
.940" + .940" = 1.84". so taking the middle of the production journal width (2.0995") that leaves you .2595" left after rods are installed. Ls1 rods give you .2097" left after rods. Now i think you would have to assemble it to check side clearance but i did find this:
i'd mock it all up and see what you get. so far it all sounds good if the rods dont contact the bottom of the bores anywhere.
Edit: i just read this in CircleTrack Mag
so if we go off that you have about .2595 left. even if you have to (i dont know) divide that to get clearance on both sides and in the middle your looking at .0865" on both sides and in between. i would imagine the bore placement in the block will hold the rods offset so the middle would have larger clearance but im not positive.
Edit #2: i just read this as well
It depends since some Nextel Cup engines have over a .100 side clearance when they are pin guided. Some have MUCH more. The oil flow is really only determined by the bearing clearances anyway. OTOH many Comp. Elim. engines that go 10,000 rpm have only .015 side clearance from some big shops and they also have no problems. It's just not a big deal. Average on aftermarket stuff is around .020 - .025 usually and it runs all over the country like that.
i'd mock it all up and see what you get. so far it all sounds good if the rods dont contact the bottom of the bores anywhere.
Edit: i just read this in CircleTrack Mag
The final step is a check for rod side clearance. This is accomplished by taking a measurement across the rod journal. Next a measurement of the width of a pair of rods is made. The difference between these measurements is the rod side clearance
Edit #2: i just read this as well
During preassembly we discovered that a new connecting rod used to replace a bent rod was slightly wider than its predecessor. This created a very tight rod side-clearance of less than .009-inch. This required the rod to be machined to create adequate rod side-clearance. This is an easy clearance to check using just a feeler gauge, but it does require the crank and all eight rods to be installed on the crank in their respective positions. Remember to position the rods on the crank with the relieved side of the rod facing outboard.
Last edited by nastychevelle; Jul 27, 2011 at 08:58 PM.
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con rods The small block rods have an offset big end to get the beam in the center of the piston and the small end of the rod centered between the wrist pin bosses in the piston. LS rods are on center.
You are better off selling your SBC rods and getting a set made for the LS engines.
Steve
You are better off selling your SBC rods and getting a set made for the LS engines.
Steve
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Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
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