kreator33

hey, im installing a tpi set up on a pre 86 block,it doesnt have a hole drilled on top of the oil filter to screw in the oil sensor that is i think for the fuel pump switch,,,,can i put a t fitting on the top one and put both oil sensors on the top of the block?

Apeiron

Yes it does.

Yes

kreator33

no it doesnt,,, its got a round flat spot where there would be a hole,but no hole,i'm sitting 2 feet from it. but if your second ''yes'' mean i can do what i asked about,thanks.

ZZ3 Z28

I have two OPS's on top of my block. The single wire on the left is the original switch and the double wire to the right is the second switch added for the in-tank fuel pump assembly. I used a tee fitting to supply both from one tap.

kreator33

thanks,thats what i'lldo

Apeiron

I promise you it does. Every block has that hole. Long before anyone ever put a sensor or switch in it, it was just a side-effect of the manufacturing process to drill the horizontal oil passage. If you don't have that hole, you don't have any way for oil to get from the filter to the engine.

kreator33

well i dont know what to say,you think im an idiot? im staring at it right now! the guy that rebuilt my motor,told me there was no hole,and now the motor is right in my face,,,WITH NO HOLE! i can see where the hole would be in the cast,,,but its solid,,the passage is probly still in there for the oil,but it doesnt exit on the side. why would i come on here a lie about that!? that would be pretty stupid,there is just no hole.pretty sure if i drilll,im gonna tap pretty soon in a passage,but for now,its clogged.the guy that did the motor, has 40 years of experience,and he told me even before looking at it,that these blocks had no holes.and he was right.
i apreciate you tryin to somehow help by tryin to tell me there is one,,but there is none! its kinda insulting,i mean im not hallucinating!the motor is on a stand,and im sitting next to it,face right there!

ZZ3 Z28

Hi, this is the other guy. Let me ask a q. Is the intake manifold on or off? Could it be that the intake manifold is covering up the hole? When I look at mine, which is buried deep in the rear and difficult to see clearly, has a curved section where the tube is screwed into the block.



See that curved section on the right just below the large hole for the distrubutor? That's where the oil tube is. I'm asking, can yours be covered up for some reason?

kreator33

hey,,no ,the one on top is there,im gonna use it just as you did,thanks,,,its cause there is another one on the bottom of block,right above the oil filter,,,on my older block,its not there,but no biggy ,ill do what you did on yours,thats all i wanted to know,if i could use a t and put both sensors on,thanks.

vetteoz

iTrader: (13)

That is what the factory did on TPI Vettes

sofakingdom

iTrader: (1)

The hole is ABSOLUTELY THERE, as Apeiron says; it's there to cover up the end of a horizontal oil passage, which has been drilled in EVERY SBC since 1957 (when they got the oil filter provisions) to carry oil to and from the filter. They can't drill the passage without .... ,,, .... drilling. They can't cast a bit into the middle of the mold somehow and somehow make it spin from within the cast iron. Only way your block DOESN'T have it, is if it's a 265 block from 55 or 56, back before they had provisions for an oil filter.

It has a round plug with (from the factory) a square drive. It's possible of course that somebody put something else there, but the hole itself is DEFINITELY there. No sense arguing about it, you just don't recognize it. It's ¼" pipe thread.

If you can't unscrew it using the square drive, you can drill a nice hole in it, get the BIGGEST one of those square bolt extractors - NOT the twisty-looking kind - and back it out. Just don't break off the extractor because those are a mother to drill out.

But yes, you can tee off of the one behind the intake, you can get the right parts (1/8" pipe thread) at any hardware or even "home improvement" store, it's just a bit more of a pain because the wires won't reach.

ZZ3 Z28

Yes the wires are short. The original single wire switch on mine is the idiot light circuit and the two wire switch is the new circuit for the in-tank fuel pump assembly. I recently had to modify the single wire circuit some because my ZZ3 needs 10 degrees of timing and the distributor was banging up against the switch. There was barely enough wire to get a new terminal end on the thing. The only way to get more wire would be to add a length using a butt connector and some heat shrink tubing.

So when you add yours to the top of the engine make sure you get it far enough away from the dizzy in case you ever need to adjust timing there is enough space to turn it.

kreator33

yes,thanks for the advice,no problems to get the wires to fit, my car is a bare shell right now,with that freshly built motor,it was originaly carbed,now im installing tpi,the whole harness, i repined from scratch to fit my mods,from ecm to engine all the way under the dash and in the fuse block,i touched every single wire,to convert everything down to the check engine light,so i can make that wire any lenght i want.thanks for info

kreator33

hey guys, can i just bypass that oil/fuel safety switch? if so ,how?, just connect both wires together? and discard the pluggin?, i cant find the right fittings,and i dont feel i really need that , if i run out of oil,or if pressure is low on my gage, i can turn the car off, no need for a sensor to do it for me,, just wanna be sure before i bypass those 2 wires to not jeopardize something else, does that go to the computer first or jut acts as a switch along the fuel pump circuit?

Apeiron

The switch has nothing to do with saving the engine from low oil pressure, it's a backup to the fuel pump relay. Leave it disconnected if you want to eliminate it. The pipe fittings you need are as common as dirt, though.

kreator33

i know they are supposed to be common,but i only have nights and weekends to shop for them, i went to canadian tire no luck, marshland, princess auto,few parts store that were still open,no luck, the switch has different threads than the sender, i wanted to just drill and tap the hole for the switch on the block thats already there,but its too small for the size of the switch. so what does that switch do exactly? by leaving it unplugged,would mean removing the circuit all together? cause if i delete something, ill trace it back to start and remove it from harness,not leave it dangling,, so i dont have to connect em together,jut leave open,,right? what am i gonna miss, what kind of ''backup'' is that supposed to be, i always read that it was a switch to turn off the fuel pump in the event you run low in oil pressure,if not,can you explain better what it is then? im not gonna unplugg something that could be necessary

Apeiron

The switch is wired in parallel with the fuel pump relay so that if the relay fails then the switch will power the pump. If you were to twist the wires together you'd have a fuel pump that ran all the time.

The sender and the switch are both supposed to be 1/8 NPT. Canadian Tire has pipe fittings but they're usually hidden in some aisle and the selection is sometimes kind of meagre. Any Princess Auto worthy of the name has to have more pipe fittings than you could ever have any idea what to do with, though. Failing that, go to NAPA and tell the guy you want to dig around in the Weatherhead bins for a while.

kreator33

yeah, thanks, the sender is 1/8 pipe thread but the switch is twice the size, ill try the fitting bins again,but couldnt find anything yet,ill go napa tonight,or ill cut the damn wire ,thanks

vetteoz

iTrader: (13)

Sender that goes above filter is often 1/4"NPT and has extended nose to clear the filter boss

http://www.motorcityreman.com/pss228.html

vetteoz

iTrader: (13)

Going to be hard work because you have to adapt up from 1/8 to 1/4
Maybe get another switch that has 1/8" threads to suit the hole?

http://www.motorcityreman.com/generalmotors14.html

kreator33

i just squeezed out all the fitting from the dude at napa,,,, looks like a paki hash pipe,but its gonna do the trick

kreator33

ill keep it in the car now that i have what i need
thanks

Apeiron

Weatherhead 23204x2