What cam is this?

[lexxman]

I'm getting ready to start rebuilding my 383.I want to reuse the cam that was in it ,(its still in good shape no alot of wear.) I measured it and the lobes and I got 1.56 by 1.26. there are no markings on it that I can see,but there is some purple paint near the drive gear. I should have my parts order next week.

[justcruisin]

Not a lot of info but it is probably the mopar purple shaft 4452783, 268/284 duration,.450/.458 lift. Presuming hydraulic.

[lexxman]

Yes they are hydraulic. So would that be a stock or above stock cam? I don't know alot about cams,would a stock value spring be ok with that? I have 906 heads.

[XH29N0G]

Unless I am mistaken, a .450 lift intake cam was used in hi perf 383 in the late 1960's and early 1970's.  I take it that the .450 number is your 0.30 x 1.5 for the rocker arm ratio. 

I would wait to see what others say who know more, but my guess is you are fine with stock springs and this cam.

[lexxman]

A lot of this is new to me,I haven't played around mush with cam before.I've got a couple of mopar engine book ,so I'll be doing some reading.

[firefighter3931]

Based on the posted lobe dimensions it's probably the BB resto cam....not a bad choice but there are much better ! 

Ron

[lexxman]

My big question now would be will stock value spring work?Right now I'm working with what I have,things may get upgraded down the road. I just got my parts order to do the rebuild,so now the fun can start.

[firefighter3931]

My big question now would be will stock value spring work?Right now I'm working with what I have,things may get upgraded down the road. I just got my parts order to do the rebuild,so now the fun can start.

As long as the valvesprings are in good condition you should be fine. With that cam i would want to see 120lbs seat pressure and 300lbs open to keep the valvetrain stable. 

Have the spring pressures checked 



Ron

[lexxman]

I will check the springs,I will keep you all updated. What should it cost to get the cam bearings changed? I have the new ones,the old ones were not a lined with the oiling holes in the block quite right I tried to fix and screwed it up(the bearing ,not the block).

[firefighter3931]

Machine shop rates vary by location but i would expect a cam bearing install would cost $75-$100 


Ron

[lexxman]

Thanks Ron,I called at lunch today and they said 100.00(20.00 per bearing). So I'll take it down next week.

[ACUDANUT]

If your doing a new cam bearing install. I would order a new cam.