5.3 vortec engine placement question.

[dbleon]

My logic,

Measure between flanges at 3 and 9 clock on each side. should be exactly the same or very close...

Then measure the difference at 6 and 12 o clock.

IIRC I read somewhere that 1/8" difference between flanges can equte to ~1 degree.

So a rough guess to stay less than 2 degree offset from parallel (desirable with standard u-joint drivshaft) would be less than 1/4" total (combine both directions?)

Please geeks to chime in (cough: ntsqd)

 

[gurskey]

I have been using a makeshift driveshaft that is actually just an extendable paint roller handle. In thinking about it though, even though the center of the flanges are perfectly inline, I am sure that the actual "face" of the flanges are not parallel. I am going back at it today and see if I can use all this info to figure it out.

 

[dbleon]

Another method, angle finder will tell you if the flanges are paralel.

 

[gurskey]

Texican was right. I am a "dummie" The LS heads do have about a 3/4 inch difference......so it wouldnt look to be parallel and the drivers side head would be 3/4 of an inch further away from the firewall. I rechecked everything and I had it in the right place all along. So it is all lined up and good to go.
Thanks for the all replies.

 

[warpdriv]

Texican was right. I am a "dummie" The LS heads do have about a 3/4 inch difference......so it wouldnt look to be parallel and the drivers side head would be 3/4 of an inch further away from the firewall. I rechecked everything and I had it in the right place all along. So it is all lined up and good to go.
Thanks for the all replies.

Your first mistake was not taking "The Old Wise One" words as gospel!

 

[NolanFJ60]

Sounds like your question was answered but you should post some pics of your build! I'm looking to do the same thing in the near future. nv4500 and all. Where did you source the NV4500? And are you using a gm or dodge version?

 

[lehiguy]

If you are keeping the stock rear mount, it will have your motor quite a bit off center towards the driver's side. You can pivot the whole affair on that rear mount, but as has been said, your motor centerline will not be parallel with the frame and you introduce compounded angles into your driveline and that can get hard to balance correctly. The only true fix is to go to a different rear axle with a centered diff and then center everything else. Lots of work though.