Hole identification on the cylinder heads - 302 V8

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Hole identification on the cylinder heads - 302 V8

sgauvry
Folks -

What is the hole seen in the picture below?  I've put my lower intake on and about 1/4 of the hole is showing on each side.  Are they used to pry off the intake? Or something vital and a cause for concern?  



Steven A. Gauvry - 1985 F150 5.0 EFI
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Re: Hole identification on the cylinder heads - 302 V8

85lebaront2
Steve, if it doesn't go into the crossover (passage underneath it) then it will not be a problem. If it does, then they sent you the wrong heads on that engine. Is there a casting number on the heads?
"Getting old is inevitable, growing up is optional"
Darth Vader 1986 F-350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator
Wife's 2011 Flex Limited
Daily Driver 1994 Taurus LX
Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413
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Re: Hole identification on the cylinder heads - 302 V8

Gary Lewis
Administrator
I've seen a crescent-shaped hole there that didn't connect to anything, but not a round one.  But, as Bill says, if it doesn't connect to anything there's no problem.

As for the casting numbers, they are on the bottom of a small-block head and are essentially impossible to see w/o pulling the heads.
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/soon-to-be ZF5/3.55's & EEC-V MAF/SEFI
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Re: Hole identification on the cylinder heads - 302 V8

Rembrant
In reply to this post by sgauvry
sgauvry wrote
Folks -

What is the hole seen in the picture below?  I've put my lower intake on and about 1/4 of the hole is showing on each side.  Are they used to pry off the intake? Or something vital and a cause for concern?  
I have no idea what the hole is for, but I can tell you that the stock heads on my '84 302 (D8OE) had these holes, and they were indeed partially exposed above my intake from the factory. They caught my eye during disassembly and I was also wondering what they were for, and why they were half (or quarter as you say) exposed.
In rehab: 1984 F150 2wd Flareside pickup. Original 302 2bbl DSII w/3-spd manual column shift. Plain Jane with no A/C and no radio.
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Re: Hole identification on the cylinder heads - 302 V8

sgauvry
In reply to this post by 85lebaront2
Thanks, Bill, Gary, and Rembrant! The lower intake manifold is on so I cannot visually tell if the holes go into the crossover passage.  I took and really skinny phillips and gently felt around.  The hole ends and it seems it does not go into the crossover, best as I can tell.  

Do you think the holes are there to make it easier to pry off the lower intake?  I can't figure any other purpose.  

Steve
Steven A. Gauvry - 1985 F150 5.0 EFI
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Re: Hole identification on the cylinder heads - 302 V8

Rembrant
sgauvry wrote
Do you think the holes are there to make it easier to pry off the lower intake?  I can't figure any other purpose.  
If was betting money, I'd say that is was more likely that the holes had something to do with the manufacturing process, and nothing to do with service. A locating hole for a jig or a fixture of some kind either in the machine shop or on the engine assembly line. As far as I know, it's just a blind hole.

I'll take a look at my D8OE heads this morning to check. They're off the engine now, so the holes will be easy to see.
In rehab: 1984 F150 2wd Flareside pickup. Original 302 2bbl DSII w/3-spd manual column shift. Plain Jane with no A/C and no radio.
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Re: Hole identification on the cylinder heads - 302 V8

sgauvry
Thanks!  Nice looking truck you have there!!

While I've got you, I'm considering priming the engine with oil while it's still in the engine stand. I have a dummy distributor and will use a power drill. Advantages/disadvantages to doing this while still in the stand?  I thought it may be easier to purge the air from the engine with regard to plug installation after the engine is primed.

Steve
Steven A. Gauvry - 1985 F150 5.0 EFI
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Re: Hole identification on the cylinder heads - 302 V8

Gary Lewis
Administrator
I really like priming the engine via the oil pump.  I'm not sure it makes much difference, but I like having the engine in the vehicle so you can tell when the pressure comes up on the gauge.  However, the drill will slow dramatically when the pressure comes up, so that may be a moot point.

So, in the vehicle or out doesn't matter, and if it is easier for you to do it out then go for it.
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/soon-to-be ZF5/3.55's & EEC-V MAF/SEFI
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Re: Hole identification on the cylinder heads - 302 V8

sgauvry
Thanks, Gary!
Steven A. Gauvry - 1985 F150 5.0 EFI
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Re: Hole identification on the cylinder heads - 302 V8

Rembrant
In reply to this post by sgauvry
sgauvry wrote
While I've got you, I'm considering priming the engine with oil while it's still in the engine stand. I have a dummy distributor and will use a power drill. Advantages/disadvantages to doing this while still in the stand?  I thought it may be easier to purge the air from the engine with regard to plug installation after the engine is primed.
I have my 302 pulled out and disassembled now. I'm actually dropping all the pieces off at an engine shop tomorrow morning. Getting them to go over the short block for me, and assemble the rest (GT40 heads, Comp Cam kit, Edelbrock intake, etc).

I was going to assemble it myself, and I was going to do like you and prime the oil system with a drill once the engine was back in the truck. However, now that I'm getting a shop to assemble and break-in/dyno for me, it's kind of a moot point and I forgot about it.

What is this dummy distributor you were going to use? I guess that would work fine, as long as you remove the drive gear from the distributor shaft. I know there are purpose built shafts for priming, but if you have an old distributor you can use, that should work just fine. Make sure to check rotation;).






In rehab: 1984 F150 2wd Flareside pickup. Original 302 2bbl DSII w/3-spd manual column shift. Plain Jane with no A/C and no radio.
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Re: Hole identification on the cylinder heads - 302 V8

Gary Lewis
Administrator
Yes, make sure the cam drive gear is off of the distributor you are going to use to spin the oil pump.
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/soon-to-be ZF5/3.55's & EEC-V MAF/SEFI
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Re: Hole identification on the cylinder heads - 302 V8

85lebaront2
I have a real nice one somebody sent me, works for 335 and 385 series engines.
"Getting old is inevitable, growing up is optional"
Darth Vader 1986 F-350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator
Wife's 2011 Flex Limited
Daily Driver 1994 Taurus LX
Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413
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Re: Hole identification on the cylinder heads - 302 V8

Gary Lewis
Administrator
Yes.  But, which one of us is going to use it first?  
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/soon-to-be ZF5/3.55's & EEC-V MAF/SEFI
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Re: Hole identification on the cylinder heads - 302 V8

85lebaront2
I have already used it when I flushed the cooler lines.
"Getting old is inevitable, growing up is optional"
Darth Vader 1986 F-350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator
Wife's 2011 Flex Limited
Daily Driver 1994 Taurus LX
Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413
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Re: Hole identification on the cylinder heads - 302 V8

Gary Lewis
Administrator
Good!  I'll probably make another one for my own use.
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/soon-to-be ZF5/3.55's & EEC-V MAF/SEFI