NBMWSsix

iTrader: (8)

I just did a rebuild of the Trans Am. Got a iron 5.3 block, had it bored out to 5.7. Built the engine over the past week or so and started it today.

I have no oil pressure. I know that the 5.3 iron block is a little different from the aluminum 5.7, where should I look first?

I don't know specific differences, just noticed things as i put it together like, the mounting holes for the alternator are different etc.

HELP!

slowrollin93

iTrader: (7)

There are plugs in the rear of the engine behind were you would mount the flywheel or flexplate. I know my buddy had that problem with his and no oil pressure that was what the problem was those plugs were not installed.

SOMbitch

iTrader: (8)

X2 that little barbell plug has gotten many people.....

xlcooplx

iTrader: (26)

what pick-up tube are you using? did you use the correct oil-pump o-ring? and like mentioned, that barbell looking plug has to be there.

NemeSS

iTrader: (127)

barbell plug, pinched o-ring, torn o-ring. wrong pickup tube.
did u reuse your fbody pickup with fbody pan?

NBMWSsix

iTrader: (8)

I can verify that I did not do the barbell plug thing. That block was BARE, no bearings, plugs, etc. Took those off my aluminum block. Did not notice the plug things because the aluminum has some time of cap in it instead and it was underneath the cover so I had no idea what it was, it didn't stand out to me. Marked up as a learning experience.

Know where i can get one or two, I have heard they may have two, possibly one in the front? Part numbers, names, can it be bought at Autozone, Orielly's,etc or dealer only? I will need it by this weekend so I can get it apart to add those and get it back together.

I did re-use the pick up tube, pump, oil pan,etc from my ls1. Is that a problem?

On a special note, she sounds beautiful. Much louder than I remember. MTI T1 cam does sound a bit different that the stocker.

I guess I am used to listening to our Yukon.

NemeSS

iTrader: (127)

when swapping motors, u are supposed to reuse all of your pans parts togther.
if everything is fbody then thats not the prob. its prolly a damaged o ring or barbell plug.

NBMWSsix

iTrader: (8)

Good, I did that. I will check for the barbell thing. Now do you know if I need the one in the front or just the back or if there is one in the front? I am 99% that I didn't put a plug in there so hopefully that will be it.

Appreciate teh help!

6point7s14

iTrader: (3)

Do a quick search on this site. There's a nice write up on the front plug and barbell plug in rear. Don't run it anymore without oil pressure ls1 can only survive a few seconds without oil pressure. I had the same problem but an engine builder left mine out

NBMWSsix

iTrader: (8)

Did you only have to do the rear one or did you also have to do the front. Are they the same part or different?

LS1Formulation

iTrader: (13)

The barbell is only in the rear. The front has a press in plug, like a freeze plug.

NBMWSsix

iTrader: (8)

Press plug in front and barbell in back and I have oil pressure!!!