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 Post subject: Re: Dist hold down
PostPosted: Thu May 30, 2019 4:42 am 
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Turbo EFI
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 1017
Location: Brightwood, VA
Car Model*: 1965 Plymouth Belvedere I
Reed wrote:
Hmmmm. I have a hard time believing the block was modified just for the hold down, but those are good pictures. I will investigate further.


Hey, they made a completely new head (peanut head) and the only major difference was the lack of drool tubes. No bigger valves, no improved ports or combustion chamber. Why-Why-Why???
jus sayin

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 Post subject: Re: Dist hold down
PostPosted: Thu May 30, 2019 5:57 am 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 6191
Location: So California
Car Model*: 64 Plymouth Valiant
What year did they go to cast cranks?

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64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

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 Post subject: Re: Dist hold down
PostPosted: Thu May 30, 2019 8:48 am 
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Turbo EFI
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 1017
Location: Brightwood, VA
Car Model*: 1965 Plymouth Belvedere I
I am not really certain, but I have heard they started around 1976 ish. My 79 engine is a cast crank motor and the 73 is a forged crank motor.

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 Post subject: Re: Dist hold down
PostPosted: Thu May 30, 2019 9:14 am 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
Posts: 12659
Location: Fircrest, WA
Car Model*: 76 D100
emsvitil wrote:
What year did they go to cast cranks?


It was a running change in the 1976 model year. 1976 vehicles could have been built with a forged or cast crank slant, depending on what engine was coming down the assembly line.


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 Post subject: Re: Dist hold down
PostPosted: Thu May 30, 2019 3:57 pm 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 6191
Location: So California
Car Model*: 64 Plymouth Valiant
So the forged to cast crank is in the same time period as the hold down change...………………...

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64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

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 Post subject: Re: Dist hold down
PostPosted: Thu May 30, 2019 4:09 pm 
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Turbo EFI
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 1017
Location: Brightwood, VA
Car Model*: 1965 Plymouth Belvedere I
It looks that way, but it could be unrelated. Who knows.

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 Post subject: Re: Dist hold down
PostPosted: Thu May 30, 2019 4:23 pm 
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Supercharged
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Joined: Sun Nov 03, 2002 9:20 pm
Posts: 12659
Location: Fircrest, WA
Car Model*: 76 D100
I believe the change in hold down was made after the switch to cast crankshafts. Very late 70s or early 80s.


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 Post subject: Re: Dist hold down
PostPosted: Fri May 31, 2019 4:51 pm 
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Turbo EFI
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Joined: Wed Nov 23, 2011 11:07 am
Posts: 2080
Location: SF Bay Area
Car Model*: 67 dart 2 door hardtop
I have an older block and use the newer two-piece hold down. My block seemed to have a surface for the tab to leverage against to hold down the ring, but now that I've read this thread, I'm going to have to check to see if I'm correct. Hmm, maybe I used a different hold down clamp from a V8 or something or it's not holding it down as well as I think...I'll check on both and post a reply on what I find.

brian

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 Post subject: Re: Dist hold down
PostPosted: Fri May 31, 2019 5:52 pm 
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Turbo EFI
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 1017
Location: Brightwood, VA
Car Model*: 1965 Plymouth Belvedere I
None of the V8 ones (Mopar or otherwise) will work on the slant block without some changes. The Mopar big block comes closest, but even that one needs a lot of work. A slant six claw WILL work on earlier blocks to some degree, just not as well as it would on the blocks it was designed for. I will try to take pics of the claw on early and late blocks.
jus sayin

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 Post subject: Re: Dist hold down
PostPosted: Sat Jun 01, 2019 9:24 am 
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Turbo EFI
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Joined: Wed Nov 23, 2011 11:07 am
Posts: 2080
Location: SF Bay Area
Car Model*: 67 dart 2 door hardtop
That's great if you can post pics, helpful info for the community.

My dart is at the body shop right now so I can't check. Honestly, the gray cells go over time, i don't recall if I used a slant hold down or some modified thing I made...I'll be able to check next weekend, hope to get my car back this week.

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 Post subject: Re: Dist hold down
PostPosted: Sat Jun 01, 2019 12:54 pm 
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Board Sponsor

Joined: Wed Oct 23, 2002 7:57 pm
Posts: 6488
Location: Waynesboro, Pa.
Car Model*: 65 Valiant 2Dr Post
The newer style hold down does not work with at least some older blocks. I run the newer style hold down on the older block, because of the extra adjustability it gives. I had to cut the piece that is supposed to hit the block and move it closer to the hold down bolt so it would hit the block. I think I also bent the forks a little bit down as well. This ain't rocket science. :D :D :D

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 Post subject: Re: Dist hold down
PostPosted: Sat Jun 01, 2019 6:02 pm 
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Turbo EFI
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 1017
Location: Brightwood, VA
Car Model*: 1965 Plymouth Belvedere I
I posted what information I could (in two parts). I don't claim to know everything about these, but I did want to share what I have discovered. I personally prefer the claw style mount for its range of adjustability.
Like Rick says, it isn't rocket science.

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http://www.MattmansMopars.com
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 Post subject: Re: Dist hold down
PostPosted: Sun Jun 02, 2019 12:45 pm 
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 12621
Location: Park Forest, Illinoisy
Car Model*: 68 Valiant
I have used the 2 piece one on my forged crank motor without any modifications. Guess I'm just lucky.

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