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Decided to start building an iron head 6.0 for my 73 Camaro RS. There really isn't a lot of solid info on these long crank motors so I've decided to post a few photos of mine along the way and show you how this thing is going work in front of a super t-10. The idea is that on these early 6.0's 1999-2000 the crank is .4" longer where the flywheel mounts. There's a funny flange. The idea is that if you want to run a manual transmission with one of these you need a special flywheel made my mcleod, part number 460537. Normally the iron head motors are thrown away. I picked this one up for cheap and am confident I can get a great motor for less money than buying an aluminum headed one. My goal is to carburettor and get as close to 500hp as I can with stock heads and a cam. Here are a few photos of my progress so far:
When she arrived this afternoon
This is the notorious long crank. Bolting a manual flywheel to this long flange means the starter will not reach the ring gear !
Got her stripped :
Going to swap the iron head guts into these bare 853 castings which were almost free.
Really hope I can reach my goals with this thing. Even 475hp would be great. I may get the heads milled a bit, I need to do a bit of math and figure out what compression ratio this thing will be with those 853 heads. Updates will be slow for a month or so, Cheers !
Hi. I was under the impression that the long cranks came on all the engines up till 2002. Did all the long crank engines have iron heads? I have a LQ4 for my firebird and I am just found out about the long crank. I'm not sure what year I have.
I decided to say off with the LS1 heads. I'm going to have to buy an intake, cam and springs that suit the heads, so why build with garbage heads when I know I will want more hp later. So I bought a set of L92 heads. The question now becomes, what cam ? How much do I mill ? Do I flycut ? All things I need to research, I'd love to hear input on your experience with L92's and a carb anyone !
The issue comes from the starter motor itself. The auto flexplate for those years is moved such that the ring gear sits .4in closer to the engine so it is somewhat conical. A stock flywheel will leave the ring gear .4in too far from the motor.
Could get a manual behind a 4.8.
I have a 4.8 from a 2000 truck in my car, it also has the long crank and was from a 5spd truck
I was not aware that 4.8 had the long flange as well. Were you able to use an OEM flywheel ? I am under the impression that the 99/00 6.0's were only ever in front of autos
I never heard of the long crank with the 4.8 . I used a 4.8 flywheel on my 5.3 for my 5 speed in my 1992 pickup. I think someone makes the flywheel for the long crank but i am not sure who.
You could also get a manual behind a 6.0 in the 2500.
Long time no post. I wanted to give you some more info on the long crank motors because I now feel like I know what I'm talking about. I have a factory GM flywheel at my house that I think would actually work. It has a spacer on it from the factory which I removed. The starter looks like it will engage fine.GM part number is 12561758.
With all that aside, I contacted mcleod about it and it turns out that they don't have a clutch that will work with that flywheel and hold any power! So from my understanding, there IS a factory flywheel, number listed above, but it's outta the picture if you want to make power. That being said, I am still ordering the mcleod wheel with large surface area so that I can run a good clutch.
The engine is all together now. I got my LS3 heads milled .020 and installed with .051 cometic gaskets. The quench looked on the money. I am now awaiting install in the car as my motor mounts are back ordered. Can't wait to drop this thing in!
My stater can’t reach the fly wheel it’s too far towards the gear. What can I do to solve this issue? Should I change the fly wheel or crankshaft ? What should I do ?
[QUOTE=Ali Bin zayed;20241623]My stater can’t reach the fly wheel it’s too far towards the gear. What can I do to solve this issue? Should I change the fly wheel or crankshaft ? What should I do ?[/QUOTE
After finding almost nothing about the long crank 6.0L. I called Mcleod and there flywheel 460537 works perfect. Starter ring gear is in the correct location and it’s drilled for both the metric and standard 11” clutch. Also Advance adapters has a flywheel that looks like it will work. Part# CF720000. Both cost about $320. I am bolting the 6.0L to a TKO600 that is built for a first gen SB/BB
02-03-2016, 12:39 AM
Long crank/Iron head 6.0 build 
