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04-06-2007, 10:48 PM | #1 |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Tapping for threaded plugs
I want to tap the three holes under the timing gear (oil passages). I went to measure the hole size before I started and they all are .510. The drill needed for a 1/4 pipe thread is .437 (7/16).
Can anyone confirm how do this? Just tap it anyway? I think I値l drill a .510 hole in a block and try the tap. If anyone has a link or info on this process can you post it? Thanks, s/t
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. |
04-06-2007, 11:22 PM | #2 |
Senior Member
Join Date: May 2002
Location: NORTHEAST OHIO
Posts: 493
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Re: Tapping for threaded plugs
you really should use a tapered reamer before tapping a pipe thread and .073 oversize on the hole may be to much
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04-07-2007, 09:17 AM | #3 |
Registered User
Join Date: Jan 2007
Location: Sonoma, CA
Posts: 521
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Re: Tapping for threaded plugs
Bill Jenkins has a different opinion regarding the need to use threaded plugs:
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Oscar '72 Shortbed Fleetside '95 Jimmy 4X4 '69 GMC Custom Camper |
04-07-2007, 09:28 AM | #4 |
GEARHEAD
Join Date: Jan 2007
Location: CENTRAL,PA
Posts: 2,284
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Re: Tapping for threaded plugs
Bill Jenkins method is still very commonly used today. there is a actual tool to perform this task avalible through many performance suppliers.
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04-07-2007, 10:01 AM | #5 | ||
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Tapping for threaded plugs
Quote:
Quote:
What is the reason to go with threaded plugs? I mean, is it because they will pop out with a high-flow oil pump? FWIW I’m going to use a stock oil pump. Is this a non issue since I’m not going with a high flow? Staking seems to be a good alternative though. Thanks. s/t
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. Last edited by Sport/Truck; 04-07-2007 at 07:05 PM. |
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04-07-2007, 07:21 PM | #6 |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Tapping for threaded plugs
Is the standard press in plugs ok for a stock oil pump?
I知 just wondering why this is necessary. What is everyone else doing? The one above looks like a small cold chisel was used for staking. I知 concerned about messing this thing up, because once I tap it there痴 no going back. I知 not sure why the hole size is measuring so big, and yet people say to tap it? The ID from the hole and the OD of the plug is only .020 difference. I guess if I only start the tap, then let the plug bottom out on the uncut area then it will get tight. But that would be ghetto IMO. Any thoughts on this? I知 going to call NAPA and get size of there press in plug to make sure I don稚 have something different. s/t
__________________
1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. |
04-08-2007, 04:47 AM | #7 |
Registered User
Join Date: Jan 2007
Location: Sonoma, CA
Posts: 521
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Re: Tapping for threaded plugs
Yes, just think of how many millions of SBC's there are out there without failures. I'm using a melling hv55 and haven't had any issues even with 80+ psi on cold mornings. My plugs are staked stockers.
It's not. It is just an option that some people choose to do. I'm using pressed in plugs like stated above. Quote below is from Bill Jenkins' book "The Chevrolet Racing Engine" (1976) Yes, I am that old.
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Oscar '72 Shortbed Fleetside '95 Jimmy 4X4 '69 GMC Custom Camper Last edited by FLEET72; 04-08-2007 at 04:50 AM. Reason: add source |
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