what is this hole? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rick0312 · 08-11-2009, 08:51 PM

i am about to fire up the motor for the first time and was under the truck checking everything out. I came across a hole under the fuel pump housing on the block. Does this hole need to be plugged? Or does it serve a purpose?
I posted a picture of the motor when it was out of the truck. Sorry for the poor picture, but i know you guys will have an answer for this one. Thanks

rick0312 · 08-11-2009, 09:53 PM

bump

vectorit · 08-11-2009, 10:00 PM

What year block is that?

If yer stickin it in a 67/72 then I'd just plug it with a allen bolt.

Honestly, I have no idea...

cdowns · 08-12-2009, 12:50 AM

theres a flat metal plate that mounts on there and the fuel pump mounts to the plate// service manuals have clear illustrations ,pictures and instructions how to do the job correctly

vectorit · 08-12-2009, 01:11 AM

Quote:

Originally Posted by cdowns

theres a flat metal plate that mounts on there and the fuel pump mounts to the plate// service manuals have clear illustrations ,pictures and instructions how to do the job correctly

I get where you are comin from I think, but that hole he has circled is right at the oil pan boss.

rick0312 · 08-12-2009, 01:32 AM

sorry guys. and cdowns!..... picture is misleading..... mechanical pump is installed and motor is in the truck. here is one from under the truck. just trying to head off any problems before i start this new crate motor.......thanks

rick0312 · 08-12-2009, 01:53 AM

man where is longhorn man when i need him....I know he has the answer!!

mclairmo · 08-12-2009, 01:55 AM

If it goes into the engine and is not plugged you will oil everywhere, I assume. Looks like it needs a plug pressed into the hole.

rick0312 · 08-12-2009, 02:13 AM

looks like that to me also. why the hell would they put something like that there?

mclairmo · 08-12-2009, 03:10 AM

Is it there so you can insert a screwdriver or other tool into the hole to help align the fuel pump push rod while installing the fuel pump?

BarryB · 08-12-2009, 08:50 AM

Is it all the way thru ?? If not don't worry about it. It was probably machined or cast in there for a sensor or some kind of jig they have at the factory.

rick0312 · 08-12-2009, 11:58 AM

anybody know for sure? I have pre primed the motor and no oil seen coming from hole, but I know alot more oil will be thrown around when i start the motor.

BarryB · 08-12-2009, 12:49 PM

Yeah I went out and looked at a couple of blocks I have. They have the same hole. Nothing but road grime in them. I'd say like I said before, at the factory there mass producing these blocks, so they have that hole there for putting it in a jig for machining after it has been cast. If you'll notice there ones at the back also, All the Small blocks I've messed with have those same holes. So the jig idea makes the most since to me.

rick0312 · 08-12-2009, 12:53 PM

Thanks Barry! I had an old 305 sitting in the garage and it too has the same hole. Didn't notice it at first lots of grease and grime. Thanks so much for checking into that for me I appreciate it....Rick

woodridge · 08-12-2009, 01:10 PM

The hole is used only in manufacturing. One of the first machined in the block and used to index for further machine work.

08-11-2009, 08:51 PM	#1
rick0312 Registered User Join Date: Jan 2006 Location: Warrington, PA Posts: 403	what is this hole? i am about to fire up the motor for the first time and was under the truck checking everything out. I came across a hole under the fuel pump housing on the block. Does this hole need to be plugged? Or does it serve a purpose? I posted a picture of the motor when it was out of the truck. Sorry for the poor picture, but i know you guys will have an answer for this one. Thanks Attached Images __________________ 69 C10 LWB GM 350 crate motor, 3.73 rearend

08-11-2009, 09:53 PM	#2
rick0312 Registered User Join Date: Jan 2006 Location: Warrington, PA Posts: 403	Re: what is this hole? bump __________________ 69 C10 LWB GM 350 crate motor, 3.73 rearend

08-11-2009, 10:00 PM	#3
vectorit What? Join Date: Jun 2007 Location: Southern California Posts: 7,617	Re: what is this hole? What year block is that? If yer stickin it in a 67/72 then I'd just plug it with a allen bolt. Honestly, I have no idea... __________________ Chris 1968 K20 Suburban 1972 K10 LWB PU

08-12-2009, 12:50 AM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: what is this hole? theres a flat metal plate that mounts on there and the fuel pump mounts to the plate// service manuals have clear illustrations ,pictures and instructions how to do the job correctly __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

08-12-2009, 01:32 AM	#6
rick0312 Registered User Join Date: Jan 2006 Location: Warrington, PA Posts: 403	Re: what is this hole? sorry guys. and cdowns!..... picture is misleading..... mechanical pump is installed and motor is in the truck. here is one from under the truck. just trying to head off any problems before i start this new crate motor.......thanks Attached Images __________________ 69 C10 LWB GM 350 crate motor, 3.73 rearend Last edited by rick0312; 08-12-2009 at 01:51 AM.

08-12-2009, 01:53 AM	#7
rick0312 Registered User Join Date: Jan 2006 Location: Warrington, PA Posts: 403	Re: what is this hole? man where is longhorn man when i need him....I know he has the answer!! __________________ 69 C10 LWB GM 350 crate motor, 3.73 rearend

08-12-2009, 01:55 AM	#8
mclairmo Registered User Join Date: Jan 2006 Location: Take Off Posts: 1,908	Re: what is this hole? If it goes into the engine and is not plugged you will oil everywhere, I assume. Looks like it needs a plug pressed into the hole.

08-12-2009, 02:13 AM	#9
rick0312 Registered User Join Date: Jan 2006 Location: Warrington, PA Posts: 403	Re: what is this hole? looks like that to me also. why the hell would they put something like that there? __________________ 69 C10 LWB GM 350 crate motor, 3.73 rearend

08-12-2009, 03:10 AM	#10
mclairmo Registered User Join Date: Jan 2006 Location: Take Off Posts: 1,908	Re: what is this hole? Is it there so you can insert a screwdriver or other tool into the hole to help align the fuel pump push rod while installing the fuel pump?

08-12-2009, 08:50 AM	#11
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: what is this hole? Is it all the way thru ?? If not don't worry about it. It was probably machined or cast in there for a sensor or some kind of jig they have at the factory. __________________ We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff!

08-12-2009, 11:58 AM	#12
rick0312 Registered User Join Date: Jan 2006 Location: Warrington, PA Posts: 403	Re: what is this hole? anybody know for sure? I have pre primed the motor and no oil seen coming from hole, but I know alot more oil will be thrown around when i start the motor. __________________ 69 C10 LWB GM 350 crate motor, 3.73 rearend Last edited by rick0312; 08-12-2009 at 11:59 AM.

08-12-2009, 12:49 PM	#13
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: what is this hole? Yeah I went out and looked at a couple of blocks I have. They have the same hole. Nothing but road grime in them. I'd say like I said before, at the factory there mass producing these blocks, so they have that hole there for putting it in a jig for machining after it has been cast. If you'll notice there ones at the back also, All the Small blocks I've messed with have those same holes. So the jig idea makes the most since to me. __________________ We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff!

08-12-2009, 12:53 PM	#14
rick0312 Registered User Join Date: Jan 2006 Location: Warrington, PA Posts: 403	Re: what is this hole? Thanks Barry! I had an old 305 sitting in the garage and it too has the same hole. Didn't notice it at first lots of grease and grime. Thanks so much for checking into that for me I appreciate it....Rick __________________ 69 C10 LWB GM 350 crate motor, 3.73 rearend

08-12-2009, 01:10 PM	#15
woodridge Senior Member Join Date: Feb 2005 Location: Maynardville, Tn Posts: 3,030	Re: what is this hole? The hole is used only in manufacturing. One of the first machined in the block and used to index for further machine work. __________________ SEMA Network- Protect our Hobby! 71 C30 in pieces, starting to come together. Click here for A Place For Tennessee Truck Enthusiest To Meet



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