When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Please school me on how much I don’t know here: putting together my first ls block for a little turbo t56 project I’m working on. It’s a 90k miles block bored to 3.905, wiseco pistons and eagle rods for a CR or 10:1. I have the short block together, cam and oil pump in and the motor seems much harder to turn than it should be. Takes approx 65 ft lb to “unstick” the motor and 45-50 to continuously turn it. Crank turns smoothly and without any noise. There’s a ton of assembly lube in there. Bearing clearances were all in spec.
Yeah, something is amiss with those numbers being just the shortblock. Try unbolting the cam sprocket and see if it gets better. Very common to have a camshaft bind. You said crank turned smoothly, so you can check off main bearings. Did you gap rings?
For a data point for you here, my last shortblock took 10.9 ft lbs. lbs to move and 12 ft lbs to spin, using my digital SnapOn torque wrench. Granted, it wasn’t your run of the mill build, with a lot of trick ingenuity.
Yeah, something is amiss with those numbers being just the shortblock. Try unbolting the cam sprocket and see if it gets better. Very common to have a camshaft bind. You said crank turned smoothly, so you can check off main bearings. Did you gap rings?
For a data point for you here, my last shortblock took 10.9 ft lbs. lbs to move and 12 ft lbs to spin, using my digital SnapOn torque wrench. Granted, it wasn’t your run of the mill build, with a lot of trick ingenuity.
now that I think about it, seems like it did get a whole lot harder to turn once I had the timing set on. How to fi fix a bind in the cam? It didn’t seem to slide in super easy, but it was smooth
What bearings did you use? Do you know what the clearances are?
Can you show us a picture of how the main caps are installed?
sorry about the crappy pic, it’s a screenshot from a video I took. The clearances were all very close to .003 and the rings were gapped per wiseco spec, .026 and .028 if I remember right
First picture show engine with heads installed - are you doing this with heads installed??
I am. Shouldn’t matter though I don’t think. No pushrods, no plugs etc. I put them on to measure for pushrod length.
Originally Posted by RonSSNova
Pull the rockers off first and get a reading.
Then try removing the timing gear.
I'd bet you spun the cam after install to make sure it was free?
Ron
Rockers are free. When I installed cam, I put all three screws in and could turn with a small screwdriver, but it didn’t spin very freely like I am now reading it should
so valves are closed and you are Turing the engine to push all the air out the spark plug holes - Hmm good compression!!!
I think you do not have a problem!!!
that wasn’t a factor that I thought about... even with plugs out you’ve still got some decent compression. Another aspect is I’m using screaming eagle assembly lube from my Harley days. It’s gotta be the thickest assy lube ever. Stuff is like honey.
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.
7 Most Reliable High-Performance Engines GM Has Ever Built
Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
LS1 short block hard to spin 
