Fitting for oil pressure line - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hawker7 · 06-21-2009, 08:21 PM

I bought a new 350 crate motor and went I went to intall the oil pressure line that goes to my stock gauge but found out the connection in the new block is above the oil filter. On my old block the connection was on the top of the block behind the intake manifold and was a different size. Anyone what size fitting I need to run the line down near the filter? I went to NAPA and a few other places and they had no clue. Thanks

dan42 · 06-21-2009, 08:38 PM

Bummer. Nothing like something like that to stop your progress. You may have to make one up - get the fitting for the motor side and use the old fitting for the gauge side, and get a flair tool and put it together. Good luck.

**El Jay** · 06-21-2009, 08:45 PM

I have to plead ignorance here.
Having never messed with a crate engine, are they metric?

Hawker7 · 06-21-2009, 08:48 PM

I can run 1/2 tap in the hole so I believe it is standard. I'm sure GM changed over when they went to electric oil senders. I assume all crate motors are this way so I'm hoping someone else went through this when using their stock oil gauge on a crate motor?

**El Jay** · 06-21-2009, 08:59 PM

With my GMC and now with my Chevy (Chevy does have an aftermarket gauge), the oil pressure pickup was/is 1/* NPT.

Had the same thing on a BBC boat engine and a BB F, F, F, 1 of them blue oval things engine.

TEXAS 68 · 06-21-2009, 09:08 PM

I didn't buy acrate motor, but I.m installing a 98 votec (fitting is above filter) and I went to o"reilly and bought a line kit for aftermarket guages. It had different fittings and the new line.

Longhorn Man · 06-21-2009, 10:09 PM

you sure there isn't a plug in the hole up top behind the intake?

**El Jay** · 06-21-2009, 11:40 PM

Quote:

Originally Posted by El Jay

With my GMC and now with my Chevy (Chevy does have an aftermarket gauge), the oil pressure pickup was/is 1/* NPT.

Had the same thing on a BBC boat engine and a BB F, F, F, 1 of them blue oval things engine.

That was supposed to be 1/8" NPT

mikajo39 · 06-22-2009, 12:01 AM

Quote:

Originally Posted by Longhorn Man

you sure there isn't a plug in the hole up top behind the intake?

Yeah thats where mine was!

Hawker7 · 06-22-2009, 06:58 AM

Quote:

Originally Posted by Longhorn Man

you sure there isn't a plug in the hole up top behind the intake?

I checked and I don't think it is there. I checked my old block and see it, but not on the new one. Of course the block is in the truck so it makes it a little harder. Should there be one on the new crate motors? What does the hole by the oil filter do?

Hawker7 · 06-22-2009, 06:59 AM

Quote:

Originally Posted by mikajo39

Yeah thats where mine was!

It was on top by the intake on a new crate motor?

Hawker7 · 06-22-2009, 07:25 AM

Quote:

Originally Posted by Longhorn Man

you sure there isn't a plug in the hole up top behind the intake?

From looking at some pics I took before I put the motor in, I think I see where it might be..You might be right, and there might be plug I overlooked...If that is the case, do I have to plug up the hole near the oil filter? I wish these motors can with some instructions. Would be nice to at least have a diagram of what needs to be pluged..I called summit a while back and all they told me was to put a plug in any hole that leaks when you first run it...

hilandr452 · 06-22-2009, 07:36 AM

I just switched my 71 402 over from sender to gauge and the fitting was just above the oil filter. The fitting to the block was 3/8 I believe but the old sending unit was installed with a 1/8-3/8 reducer. Napa sold me a kit for installation that had all possible combinations for like 9 bucks. Oil gauge works perfectly from that location.

Dan

mikajo39 · 06-22-2009, 01:55 PM

Quote:

Originally Posted by Hawker7

It was on top by the intake on a new crate motor?

Yeah it was, it was a late model block to like 90 and up or something like that. Do you know what year block you have? Also it was hiding from me i could barely find it when the engine was out of the truck

Hawker7 · 06-22-2009, 02:25 PM

Quote:

Originally Posted by mikajo39

Yeah it was, it was a late model block to like 90 and up or something like that. Do you know what year block you have? Also it was hiding from me i could barely find it when the engine was out of the truck

OK, I think I found it. I think I dismissed it as my oil line fitting from my old block would not fit into the hole on the new block, so I thought that hole was for something else. Do I have to plug the hole I see that is on top of the oil filter if I use the hole on top of the motor?

**CPNE** · 06-22-2009, 04:05 PM

yes

mikajo39 · 06-22-2009, 06:09 PM

Quote:

Originally Posted by Hawker7

OK, I think I found it. I think I dismissed it as my oil line fitting from my old block would not fit into the hole on the new block, so I thought that hole was for something else. Do I have to plug the hole I see that is on top of the oil filter if I use the hole on top of the motor?

Yeah just go to a auto parts store and find a plug for it and put some thread sealer on it and pop it in. What engine did you get?

Hawker7 · 06-24-2009, 07:34 AM

Quote:

Originally Posted by mikajo39

Yeah just go to a auto parts store and find a plug for it and put some thread sealer on it and pop it in. What engine did you get?

I got the 260HP 350 crate motor. I ran the line to hole I found on top of the block and the gauge works now.

Hawker7 · 06-24-2009, 07:36 AM

Quote:

Originally Posted by hilandr452

I just switched my 71 402 over from sender to gauge and the fitting was just above the oil filter. The fitting to the block was 3/8 I believe but the old sending unit was installed with a 1/8-3/8 reducer. Napa sold me a kit for installation that had all possible combinations for like 9 bucks. Oil gauge works perfectly from that location.

Dan

Thanks, I did just that. I bought the kit from NAPA and it had all the fittings I needed.

06-21-2009, 08:21 PM	#1
Hawker7 Registered User Join Date: Jan 2008 Location: Raleigh, NC Posts: 321	Fitting for oil pressure line I bought a new 350 crate motor and went I went to intall the oil pressure line that goes to my stock gauge but found out the connection in the new block is above the oil filter. On my old block the connection was on the top of the block behind the intake manifold and was a different size. Anyone what size fitting I need to run the line down near the filter? I went to NAPA and a few other places and they had no clue. Thanks

06-21-2009, 08:38 PM	#2
dan42 Registered User Join Date: Feb 2007 Location: Cali Central Coast Posts: 5,191	Re: Fitting for oil pressure line Bummer. Nothing like something like that to stop your progress. You may have to make one up - get the fitting for the motor side and use the old fitting for the gauge side, and get a flair tool and put it together. Good luck. __________________ '67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7

06-21-2009, 08:45 PM	#3
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: Fitting for oil pressure line I have to plead ignorance here. Having never messed with a crate engine, are they metric? __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

06-21-2009, 08:48 PM	#4
Hawker7 Registered User Join Date: Jan 2008 Location: Raleigh, NC Posts: 321	Re: Fitting for oil pressure line I can run 1/2 tap in the hole so I believe it is standard. I'm sure GM changed over when they went to electric oil senders. I assume all crate motors are this way so I'm hoping someone else went through this when using their stock oil gauge on a crate motor?

06-21-2009, 08:59 PM	#5
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: Fitting for oil pressure line With my GMC and now with my Chevy (Chevy does have an aftermarket gauge), the oil pressure pickup was/is 1/* NPT. Had the same thing on a BBC boat engine and a BB F, F, F, 1 of them blue oval things engine. __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

06-21-2009, 09:08 PM	#6
TEXAS 68 Vortec in the works Join Date: Nov 2003 Location: Spring,Texas Posts: 735	Re: Fitting for oil pressure line I didn't buy acrate motor, but I.m installing a 98 votec (fitting is above filter) and I went to o"reilly and bought a line kit for aftermarket guages. It had different fittings and the new line. __________________ 68? It's all figured out untill you get it apart. Is it Sunday yet??? 68 Project 68 SWB frame off/98 Vortec with stock FI/power everything. 95 ECLB 2500 with 346,000 on the clock(the original HD) 99 Lesabre-wifes ride 08 Crew Cab LTZ-All Mine 89 SWB 5/7 drop-Son's first ride.

06-21-2009, 10:09 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Fitting for oil pressure line you sure there isn't a plug in the hole up top behind the intake?

06-22-2009, 07:36 AM	#13
hilandr452 Registered User Join Date: Jan 2009 Location: Colorado Springs, CO Posts: 357	Re: Fitting for oil pressure line I just switched my 71 402 over from sender to gauge and the fitting was just above the oil filter. The fitting to the block was 3/8 I believe but the old sending unit was installed with a 1/8-3/8 reducer. Napa sold me a kit for installation that had all possible combinations for like 9 bucks. Oil gauge works perfectly from that location. Dan __________________ Dan Smith Colorado Springs, CO 71 GMC Custom Camper "Longhorn" 454, TH400 73 Chevy Camper Special (Yes, it's badged a camper special) Flat Bed Motorhome conversion 454, standard tranny *"DON'T TREAD ON ME !!!"* My Project: http://www.picturetrail.com/sfx/album/view/20829244 , http://www.picturetrail.com/sfx/album/view/24654442

06-22-2009, 04:05 PM	#16
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	Re: Fitting for oil pressure line yes __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

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