D'scamaro

i did a search and found some stuff, but none with the same prob.

i just put in my 408 longblock with a 242 249 cam and ported oil pump, well it looked portedanyways, and all i had to do when i got my motor was put on the pick-up tube and o-ring and thats it, and i made damn sure that the o-ring was on right, and the screen was closed... and when i start it up cold i only have 20 psi and when its hot i have 0 psi!!! so what could it be??


could the pushrods be the wrong length, could that cause low oil press or what else?? i cant think of anything else... let me know PLEASE thanks

ss rally red

iTrader: (8)

I helped a freind of mine install a FMS 408 stroker in his car and after the install we could not get it to start! Come to find that with the base circle of the cam that was installed we had to have pushrods that were .25 shorter in lenght(basically no compression). Once we did that it fired up right away,now I know this is not the same problem you are having but my point is with a custom motor it could be anything causing the problem but it could be something very minor,check it all and good luck to you

D'scamaro

thanks man what all do you need to find out the pushrod length, i know they put 7.4's back in there, but i have the lq9 heads 242\249 cam thanks

Steve Bryant

iTrader: (1)

There are three plugs and an O ring seal that close the oil journal on the driver's side of the block. Do you know if all were installed?

Best of Luck. Don't start this up any more until you figure out the problem.

Steve

LS198Z28

iTrader: (5)

who built the motor? Yoy might also check that the pickup tube is not bent down to where it is hitting the pan. there should be a little gap between it and the pan. also what oil are you running?

dlandsvZ28

There's another thread nearly identical to yours, same problem. And another in another forum.

There is a plug in the back of the block that either fell out or was never reinstalled by the builder.

You would think by now that the builders would post a sheet attached to the block with an extra plug attached to make sure this plug is there and if not then install the extra.

His post when he found the problem.

Does anyone know what the plastic plug in the rear of the block looks like? I am not sure what I am looking for. Anyone got any pics? There are three holes that I see on the back of the block. 2 on the top and one on the left side.I dont see any plastic plugs anywhere, and if it missing the plug, id say it is the hole on the left side.??? Help someone!

D'scamaro

thanks guys

can yall point me in the direction of the oil sending unit please??? thanks a ton again guys!!!

Steve Bryant

iTrader: (1)

The oil sending unit is on top of the block, behind the valley cover at the rear of the engine. It is a tall, tubular device that screws into the block and it has a couple of wires coming out of it.

Steve

D'scamaro

thanks man, i know i bought a new one for my last motor, which i used for about 7 months and it was fine then.... but thanks for that info,

im pulling my tranny out and going to see if those plastic plugs are in there...

the plastic plugs are, two behind the rear cover and one near the oil filter right??
it might have been an oversight of mine since the block was black and all, thanks

Steve Bryant

iTrader: (1)

The front plug is behind the timing cover. The rear is a plastic plug installed behind the rear cover. There are also two side plugs which I assume are installed because if they weren't, you would have oil coming out of the left side of the block. If I get a chance tomorrow, I'll go out and take some pictures of the 6.0 L block that I bought to build my 408 stroker that I'm planning. Then I'll post them.

Steve

Steve Bryant

iTrader: (1)

Here are some pictures that I took this afternoon for you. Note: I turned the block upside down to make it easier to take the pictures, then I inverted the pictures when I was editing them.

Steve

Steve Bryant

iTrader: (1)

D'scamaro, are you having any luck with the oil pressure issue?


Steve

D'scamaro

im taking of the flywheel but one of the bolts stripped... now i dont know what to do for that, i guess drill a hole in the bolt with a bit right???

thanks for the pics steve

Steve Bryant

iTrader: (1)

Right, center punch the bolt and drill it out progressively, one or two sizes at a time. Take your time with things. I know that you have to be frustrated with things. Been there, done that, more than a few times.

Here's a good article on rebuilding the Gen III engines with some pictures and commentary that will help http://www.babcox.com/editorial/ar/eb040538.htm.

All my best,

Steve

D'scamaro

i thought about this today, abot welding a nut to the bolt that is stripped, welded real good and taking it off... i thought that was a good idea, what about y'all??

Steve Bryant

iTrader: (1)

Are you saying that the threads stripped or are you saying that you rounded the corners off the bolt head?

Steve

SUX2BU

iTrader: (14)

cut a corner off the bolt with a cutting wheel and then take a chisel to it to spin it loose. thats how i take out stubborn stripped bolts.

Slowhawk

iTrader: (12)

I would say the rear plug is not there.Pretty common to miss it if your not use to building these.

I've welded nut's to the flywheel bolt a few times.

D'scamaro

the bolt is rounded off, should i get one the same size and weld where they meet or a bigger nut that fits around the rounded off bolt and weld it from the inside?? thanks for the info guys, its really helped me

Steve Bryant

iTrader: (1)

Probably either way would work. However, have you tried vice grips? Also, if the corners of the flats are rounded off and you can center punch it and drill it out progressively (just through the thickness of the head or about 1/4"), when the diameter of the hole is about 1/4" or slightly bigger, you can just twist the head off with some vice grips. Then, take the flywheel/flexplate off and back out the remainder of the bolt with some vice grips.

BTW, stripping a bolt or nut means that you damage the threads. Hopefully you haven't done that in addition to rounding off the bolt head. You are probably fine on the threads.

Steve