So as I have don't many engine swap before this is a first for me
Bought a 6.2
Added ls7 lifters new oil pump and pan

Engine would spin freely with heads off in stand
I installed heads etc
Today as I go to bolt up the converter man the engine won't budge at all.
Afraid to break the flywheel or even the crank bolt

Any ideas ?

 

Are the spark plugs in? What are the cam specs? Have the heads been shaved? Stock pistons?

 

Stock pistons stock heads cam is in but timing chain is off no spark plugs no rockers or pushrods on yet

 

Are these motors interference motors? If so and u have the pushrods/rocker tightened down but the timing chain loose maybe a piston is caught on a valve.

 

No I don't have rockers or pushrods on

One thing though 2 flywheel bolts that go to crank went in tight others went in smooth

 

Is the converter not pushed all the way back?

 

Yea converter spins freely but flywheel won't budge

 

Is it a dished flexplate for a 60e? Or a flat flexplate for a 80e? The flat one needs a spacer.

 

Lack of experience can be a formula for disaster. A CARDINAL RULE: ALWAYS manually turn the crank after EVERY step is completed(This only take a minute because the rachet is already sitting right there). This is extremely important, but none of the repair manuals mention it and that includes the pro services such as Alldata and Mitchell. If you do this ONE extra step you'll save yourself a lot of headaches because you catch the problem right away instead of after a bunch of other stuff has been installed as it appears to have happened in this case. You need to turn a minimum of 720 degrees of crankshaft rotation.

 

Did you put the flex plate on the correct way?