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Re: thread chaser taps, which ones to get [Re: sportfury70] #2697227
09/13/19 02:56 PM
09/13/19 02:56 PM
Joined: Aug 2019
Posts: 9,291
Super Spudsville
Mr PotatoHead Offline
Half Baked
Mr PotatoHead  Offline
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Ive never had anything crusty enough to feel the need to chase or run a tap down anything and its never caused me a problem. I will spend 2-3 hours cleaning a block after the machine work is done and use a good SS brush in all holes. Brake clean each hole and blow them out then after the 2-3 hours do the finial big soapy wash. So myself have never seen the need to chase every thread, hole, ect.

If you just spent $1700 on manchine work on a block Id hope the shop might of done this already if it was needed.


STOP POTATO HATE!
Re: thread chaser taps, which ones to get [Re: Mr PotatoHead] #2697238
09/13/19 03:53 PM
09/13/19 03:53 PM
Joined: Feb 2005
Posts: 20,116
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pittsburghracer Offline
"Little"John
pittsburghracer  Offline
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Originally Posted by JRB
Ive never had anything crusty enough to feel the need to chase or run a tap down anything and its never caused me a problem. I will spend 2-3 hours cleaning a block after the machine work is done and use a good SS brush in all holes. Brake clean each hole and blow them out then after the 2-3 hours do the finial big soapy wash. So myself have never seen the need to chase every thread, hole, ect.

If you just spent $1700 on manchine work on a block Id hope the shop might of done this already if it was needed.




Not unless you tell them to and pay them to do it. Even then they probably wouldn’t do it. You do know that the holes aren’t tapped the whole way to the bottom during manufacturing of a stock block, right?


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: thread chaser taps, which ones to get [Re: pittsburghracer] #2697243
09/13/19 04:08 PM
09/13/19 04:08 PM
Joined: Aug 2019
Posts: 9,291
Super Spudsville
Mr PotatoHead Offline
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Mr PotatoHead  Offline
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Before I reply to what I think I should reply,

"You do know that the holes aren’t tapped the whole way to the bottom during manufacturing of a stock block, right?"

In your opinion whats the significance of that?


STOP POTATO HATE!
Re: thread chaser taps, which ones to get [Re: Mr PotatoHead] #2697246
09/13/19 04:14 PM
09/13/19 04:14 PM
Joined: Feb 2005
Posts: 20,116
PA.
pittsburghracer Offline
"Little"John
pittsburghracer  Offline
"Little"John

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Originally Posted by JRB
Before I reply to what I think I should reply,

"You do know that the holes aren’t tapped the whole way to the bottom during manufacturing of a stock block, right?"

In your opinion whats the significance of that?



Proper torque I’m thinking but what do I know. Just a self taught engine builder here


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: thread chaser taps, which ones to get [Re: pittsburghracer] #2697254
09/13/19 04:53 PM
09/13/19 04:53 PM
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Posts: 893
illinois
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rbkt65 Offline
super stock
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illinois
i agree with pittsburghracer as i have seen/blown out head bolt holes that still have cuttings in them. pull a front pump apart on a 727 and blow out the holes that hold it together but b sure to have goggles or face mask on.

Re: thread chaser taps, which ones to get [Re: pittsburghracer] #2697256
09/13/19 05:08 PM
09/13/19 05:08 PM
Joined: Aug 2019
Posts: 9,291
Super Spudsville
Mr PotatoHead Offline
Half Baked
Mr PotatoHead  Offline
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Thank you for your reply and I understand that reply to a point but every arp stud ive ever installed has never had a thread left exposed on the stud and put in hand tight as arp says do not tq the stud in the hole, finger tight and ive seen some people go as far as it will go them just a hair back. But maybe you have encountered holes not drilled/tapped fully.

One thing I have noticed I dont like on some mid 70-s blocks, although my dislike dosent mean its wrong is but you can tell when they drilled and tapped the holes for the main caps in the block and they did it so forcefully it turned the immediate area around the holes black from heat.

I wont drop the shops names because of the bashing ways of the internet but some machine work ive had done by well known mopar shops, ex racers, then machine shop owners that involved areas concerning the mains and caps and such upon align boring and honing, none ever questioned or suggested to tap out more material when I take them a studded block to work on. But I also take them already hot tanked and cleaned blocks.

But I understand why people do it and do so on more crusty core blocks that have been in the elements for a while or are in humid areas.








Originally Posted by pittsburghracer
Originally Posted by JRB
Before I reply to what I think I should reply,

"You do know that the holes aren’t tapped the whole way to the bottom during manufacturing of a stock block, right?"

In your opinion whats the significance of that?



Proper torque I’m thinking but what do I know. Just a self taught engine builder here


STOP POTATO HATE!
Re: thread chaser taps, which ones to get [Re: Mr PotatoHead] #2697308
09/13/19 08:35 PM
09/13/19 08:35 PM
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4 Offline
master
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gulfport, ms, west mi
I bought a set of thread chasers from Jegs many years ago. Have used them on many builds with no problem. Chuck them in my drill on slow speed . No taps ever!!!. There is no reason to use a tap, why would you want to cut metal out of a torque holding surface ?


it's ok to butt heads, just don't do it with a butthead
Re: thread chaser taps, which ones to get [Re: gzig5] #2697441
09/14/19 12:17 PM
09/14/19 12:17 PM
Joined: Sep 2003
Posts: 19,237
north of coder
moparx Offline
"Butt Crack Bob"
moparx  Offline
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north of coder
Originally Posted by gzig5
Originally Posted by Gavin
I have a set of the cheap Summit ones and have used them effectively. If you are really cheap or just in a fix then just cut a vertical slot or two in the threads of a bolt and use that, you'll get the same result. For the price of the Summit ones, it's probably cheaper just to buy them than make your own....


This^^^. For $10 the summit ones are nice to have. But if you are missing a size, a grade 8 (preferably) bolt and dremel cutoff wheel will create the exact same thing it about one minute.


as a former machinist of 42+yrs, i have done this many, many times on odd size female threads if a chaser is not available, or i needed a job completed without enough time to procure one.
a dremel is nice, but if you don't have one, a hacksaw will, and does, work.
one thing to watch, however, if you don't want to bottom tap your female holes. [yes, that is the proper nomenclature ! grin i can hear the jokes and comments already.] make SURE your aftermarket bolts or studs do not bottom out on the existing threads. this is especially important for using bolts. even 1/2 a thread can give you false torque readings, plus bad clamping loads.
beer

Re: thread chaser taps, which ones to get [Re: moparx] #2697537
09/14/19 05:10 PM
09/14/19 05:10 PM
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Lincoln Nebraska
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RapidRobert Offline OP
Circle Track
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^^^ are you sayin just to check thread engagement/shank protrusion so the bolt does not go all the way to the bottom (which I certainly see how that would appear to be torqued/tight but not near enough clamping load in a borderline deal. this block was baked clean & looks pristine & what is behind this is in some prior SB builds the head gaskets were not compressed to what felpro says they should compress to (& that is with the std torque amt on the OE head bolts, I forget the #) & that got me thinking that I want to avoid that in this 408 build with .040 cometics that I want to get .040 quench.


live every 24 hour block of time like it's your last day on earth
Re: thread chaser taps, which ones to get [Re: RapidRobert] #2697604
09/14/19 08:48 PM
09/14/19 08:48 PM
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Benton, IL.
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DaveRS23 Offline
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For me personally, as a non professional, if the bolt will thread through to the bottom with little resistance, I am good. That usually means with my fingers, not a wrench. If the bolt meets enough resistance that I need a wrench, I will chase the threads until it runs in finger tight. Whether that means with a tap, a thread chaser, or a grade 8 bolt with slots cut doesn't matter much to me. It is usually just the one time. The HF taps and dies have gotten me there for years with no problems. Not bad for the $15 of so I paid for them. If the bolt happens to bottom early, I just throw a washer or two under the head of the bolt. This may not be the professional way to do it, but I have never had an issue doing it this way.

I usually make sure the head bolts will run down all the way without the head gasket or the washers in place. If they will all run down with a small amount of torque without the head gasket and washers, then I feel that they will torque down fine with the head gasket and washers. Just cheaper and easier for me rather than having a bunch of different expensive taps.

Just my twocents


Master, again and still
Re: thread chaser taps, which ones to get [Re: DaveRS23] #2697702
09/15/19 10:10 AM
09/15/19 10:10 AM
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Lincoln Nebraska
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RapidRobert Offline OP
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^^^ Dave that is top notch info, thank you!


live every 24 hour block of time like it's your last day on earth
Re: thread chaser taps, which ones to get [Re: RapidRobert] #2697712
09/15/19 10:52 AM
09/15/19 10:52 AM
Joined: Sep 2003
Posts: 19,237
north of coder
moparx Offline
"Butt Crack Bob"
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north of coder
dave gave great info for sure. as you said, your gaskets were not compressed correctly. that could be caused by either the fastener being a touch too long, or the threads not deep enough by a tick.
beer

Re: thread chaser taps, which ones to get [Re: moparx] #2697872
09/15/19 08:53 PM
09/15/19 08:53 PM
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Val-haul-ass... eventually
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BradH Offline
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Had to use mine today. I was mocking up my heads & rockers to check the pushrods and noticed some of the long head bolts didn't screw in easily. Ran the chaser down every one of those holes and some questionable "stuff" came out. Wondering if water from the leaking head gaskets seeped into them without my realizing it and caused the corrosion.

Re: thread chaser taps, which ones to get [Re: BradH] #2697883
09/15/19 09:12 PM
09/15/19 09:12 PM
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Lincoln Nebraska
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RapidRobert Offline OP
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Agreed, nothing can be assumed/taken for granted.


live every 24 hour block of time like it's your last day on earth
Re: thread chaser taps, which ones to get [Re: RapidRobert] #2697914
09/15/19 11:06 PM
09/15/19 11:06 PM
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Bend,OR USA
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Cab_Burge Offline
I Win
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Bend,OR USA
I've always used taps to clean existing bolt holes, I hadn't heard of or seen a thread chaser until I move to Oregon in 2006 shruggy
If the existing hole is cut properly the tap shouldn't remove any additional material, correct work twocents
As far as what brand to use I have a set of old Craftman, Vermont and several other brands I've bought over the years. The Vermonts seem to break off easier than any others down work


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: thread chaser taps, which ones to get [Re: Cab_Burge] #2698008
09/16/19 10:45 AM
09/16/19 10:45 AM
Joined: Sep 2003
Posts: 19,237
north of coder
moparx Offline
"Butt Crack Bob"
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north of coder
cut [regular] taps can actually start crooked [it doesn't take much] even if it feels "right", and make the threads oversize.
best to use chasers.
beer

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