Re: Are all 6 pack cams low taper design?
[Re: R/T1968R/T]
#3006047
01/16/22 09:11 PM
01/16/22 09:11 PM
|
Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
|
What are you going to do about the lifters ?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: Are all 6 pack cams low taper design?
[Re: R/T1968R/T]
#3006058
01/16/22 09:29 PM
01/16/22 09:29 PM
|
Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
|
I'm not sure how much angle on the lifter bottoms there are between stock and low taper Not sure how to measure them either i have had several sets of the early (Pre 1968) Mopar solid Hemi lifters reconditioned by a company in Seatle, WA Maybe you can have yours done too locally
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: Are all 6 pack cams low taper design?
[Re: Cab_Burge]
#3006079
01/16/22 10:55 PM
01/16/22 10:55 PM
|
Joined: Mar 2011
Posts: 3,075 Michigan
A727Tflite
master
|
master
Joined: Mar 2011
Posts: 3,075
Michigan
|
I'm not sure how much angle on the lifter bottoms there are between stock and low taper Not sure how to measure them either i have had several sets of the early (Pre 1968) Mopar solid Hemi lifters reconditioned by a company in Seatle, WA Maybe you can have yours done too locally I think the low taper was a 21” radius while the standard was 18”. But it’s been a long time.
|
|
|
Re: Are all 6 pack cams low taper design?
[Re: A727Tflite]
#3006108
01/17/22 12:53 AM
01/17/22 12:53 AM
|
Joined: Jan 2003
Posts: 10,713 North Dakota
6PakBee
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,713
North Dakota
|
Here is the '69 TSB. Note the comments for the camshaft and the tappets.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
|
|
|
Re: Are all 6 pack cams low taper design?
[Re: GODSCOUNTRY340]
#3006454
01/18/22 11:09 AM
01/18/22 11:09 AM
|
Joined: Jan 2003
Posts: 10,713 North Dakota
6PakBee
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,713
North Dakota
|
Okay, I am going from memory so take this all with a bag of salt. The standard 440 valve gear was good for about 5800 rpm. Chrysler wanted to raise this to about 6200 rpm. So they installed heavier springs on the Six-Pack motors. Heavier spring...more cam load....a low taper lobe provides more contact area and maintains engine durability with the higher loading. Again, I'm going from memory and I only have two functioning brain cells left.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
|
|
|
Re: Are all 6 pack cams low taper design?
[Re: 6PakBee]
#3006456
01/18/22 11:15 AM
01/18/22 11:15 AM
|
Joined: Nov 2007
Posts: 21,822 Kirkland, Washington
Pacnorthcuda
Too Many Posts
|
Too Many Posts
Joined: Nov 2007
Posts: 21,822
Kirkland, Washington
|
Here is the '69 TSB. Note the comments for the camshaft and the tappets.
That’s really interesting. Two things come to mind.. 1) By what criteria were the crankshafts “selected”? 2) Magnafluxing rods…did they scrap those that failed, or were they used in 440-4 motors? Not to get off topic here…
|
|
|
Re: Are all 6 pack cams low taper design?
[Re: 6PakBee]
#3006457
01/18/22 11:16 AM
01/18/22 11:16 AM
|
Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
I Live Here
|
I Live Here
Joined: Nov 2003
Posts: 10,228
Colleyville
|
Okay, I am going from memory so take this all with a bag of salt. The standard 440 valve gear was good for about 5800 rpm. Chrysler wanted to raise this to about 6200 rpm. So they installed heavier springs on the Six-Pack motors. Heavier spring...more cam load....a low taper lobe provides more contact area and maintains engine durability with the higher loading. Again, I'm going from memory and I only have two functioning brain cells left. If yours are gone, mine are too. It was also the rationale for the HD rocker arms which Direct Connection later claimed they'd reinforced the wrong end, FWTW. From this thread I assume low taper lifters are made of unobtainium? Which would make an NOS 6 pack camshaft a paper weight?
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
|
|
|
Re: Are all 6 pack cams low taper design?
[Re: 6PakBee]
#3006473
01/18/22 11:51 AM
01/18/22 11:51 AM
|
Joined: Mar 2011
Posts: 3,075 Michigan
A727Tflite
master
|
master
Joined: Mar 2011
Posts: 3,075
Michigan
|
Okay, I am going from memory so take this all with a bag of salt. The standard 440 valve gear was good for about 5800 rpm. Chrysler wanted to raise this to about 6200 rpm. So they installed heavier springs on the Six-Pack motors. Heavier spring...more cam load....a low taper lobe provides more contact area and maintains engine durability with the higher loading. Again, I'm going from memory and I only have two functioning brain cells left. Correct. And made of the standard material. I believe they had a slightly unique oil band for some reason, and I think a better retaining ring. I have some, I’ll post a pic when I find them.
|
|
|
Re: Are all 6 pack cams low taper design?
[Re: moparx]
#3006556
01/18/22 03:11 PM
01/18/22 03:11 PM
|
Joined: Jan 2003
Posts: 5,108 Chicago Blackhawks
hemicar1971
master
|
master
Joined: Jan 2003
Posts: 5,108
Chicago Blackhawks
|
Back in around 1978 I bought everything I could for a 1970-71 440 Six Pack. I owned two A12 69 Runners then and nothing was available for that motor around that time. I got this for a 1970 motor from the Dealership I use to spend most of my paycheck at. Crank, Rods, Piston, Rockers, Cam Shaft lifters, timing chain and lots of small parts. Bearings I bought at the local speed shop. I also bought rocker shafts but do not remember is they were Six Pack specific from the dealer. All this was still available at the Dealer. Built the motor myself and decided to sell it to a guy that had a 1970 440-6 Cuda. He finally only wanted the short block. I took the intake carbs, cam lifters, rockers, heads and valve cover off the motor and still have all that. I always thought the Six Pack Lifters were still available in places maybe not the dealership. I guess I have a lot of Scrap metal the way people have posted but I will like build another motor and put it in my Challenger Convertible.
1971 HEMI E BODY REGISTRY
|
|
|
Re: Are all 6 pack cams low taper design?
[Re: 6PakBee]
#3006611
01/18/22 09:10 PM
01/18/22 09:10 PM
|
Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
|
Last edited by Cab_Burge; 01/18/22 09:11 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
|
|