Author Topic: 69 DZ Blocks  (Read 5871 times)

Hot302

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Re: 69 DZ Blocks
« Reply #15 on: June 26, 2011, 09:12:15 PM »
Yes your probably right Sam. The quality control back in those days is not what it is today.
Rick
69 RS/Z28

crobjones2

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Re: 69 DZ Blocks
« Reply #16 on: June 27, 2011, 01:52:51 AM »
My late November (68) built L48 is a 388 block. I also have a L48 block from a 69 full size wagon that is a 388 2 bolt main.

John

John
Are both your L48's from theTonawanda plant?
Chris
69 SS 350

Boston14

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Re: 69 DZ Blocks
« Reply #17 on: June 27, 2011, 02:05:52 AM »
My 11D (68) L48 is a 388 block also. It is a Tonawanda cast and built engine. T1120HB

boston14
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1969 SS/RS 350 Convertible
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JKZ27

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Re: 69 DZ Blocks
« Reply #18 on: June 27, 2011, 03:42:08 AM »
Chris,
I know the one in my 12B SS is, I'm 99% sure the other one is too but I'll check tomorrow.

John
69 RS/SS Cortez Silver, L48 MC1
68 RS Ash/Ivy Gold 327EFI M20
79 Z28 Brown LM1 M21
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JKZ27

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Re: 69 DZ Blocks
« Reply #19 on: June 28, 2011, 12:45:18 AM »
Yes, the other block is a Tonawanda. Strange though, looks like the cast date is I 26 8 and the assembly is T0212HN.

John
69 RS/SS Cortez Silver, L48 MC1
68 RS Ash/Ivy Gold 327EFI M20
79 Z28 Brown LM1 M21
04 SRT 10

crobjones2

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Re: 69 DZ Blocks
« Reply #20 on: June 28, 2011, 03:34:53 PM »
it appears that only the Flint assembled motors using this block  were 302s while the Tonawanda built motors are of the 350
I am curious if your blocks are 2 or 4 bolt? Mine is a 4 bolt

Kurt/Ed/John - does the above statement follow what is in the database?
Chris
69 SS 350

KurtS

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Re: 69 DZ Blocks
« Reply #21 on: June 28, 2011, 06:03:23 PM »
Chris,
Good observation, supported by the db. Also realize that Flint sometimes didn't make many of certain suffix codes, so that distorts it some.
Kurt S
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Boston14

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Re: 69 DZ Blocks
« Reply #22 on: June 28, 2011, 11:54:41 PM »
My 388 Tonawanda block is 4 bolt also. Tonawanda did not have the machines needed to produce 2.02"  intake valved heads, so they did not produce any 302 engines (at least that I have ever heard of). John Z or Kurt correct me if I am misinformed.

boston14
boston14

1969 SS/RS 350 Convertible
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jdv69z

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Re: 69 DZ Blocks
« Reply #23 on: June 29, 2011, 12:37:33 PM »
So was the 388 block cast at Tonawanda? And shipped to Flint? Or cast at both plants?

Jimmy V.
Jimmy V.

tmodel66

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Re: 69 DZ Blocks
« Reply #24 on: June 29, 2011, 01:16:23 PM »
My 388 Tonawanda block is 4 bolt also. Tonawanda did not have the machines needed to produce 2.02"  intake valved heads, so they did not produce any 302 engines (at least that I have ever heard of). John Z or Kurt correct me if I am misinformed.

boston14

Could you explain this.  All it takes is a different fly cutter to put in seats. The guides were the same size. The castings were basically the same in configuration.
Daniel  
'69 SS 350/4 speed  Fathom Green--POP

paceme

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Re: 69 DZ Blocks
« Reply #25 on: June 29, 2011, 01:28:37 PM »
My 388 Tonawanda block is 4 bolt also. Tonawanda did not have the machines needed to produce 2.02"  intake valved heads, so they did not produce any 302 engines (at least that I have ever heard of). John Z or Kurt correct me if I am misinformed.

boston14

This issue was discussed several years ago. I recall a few orig 302's built with the 388 block.
Steve Shauger
Vintage Certification™ Program, Providing Recognition And Status To Unrestored Vehicles. Website www.vintagecertification.com

KurtS

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Re: 69 DZ Blocks
« Reply #26 on: June 29, 2011, 02:44:45 PM »
Could you explain this.  All it takes is a different fly cutter to put in seats. The guides were the same size. The castings were basically the same in configuration.
The chamber had to be clearanced for the flow. Tonawanda didn't have that tooling/station.
Kurt S
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JohnZ

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Re: 69 DZ Blocks
« Reply #27 on: June 29, 2011, 03:28:36 PM »
<<Could you explain this.  All it takes is a different fly cutter to put in seats. The guides were the same size. The castings were basically the same in configuration.>>

Photo below is a 461 chamber with 2.02/1.6 valves, but it's similar to the 462/291/186 chamber; note the added machining cut to unshroud the side of the chamber wall adjacent to the intake valve to optimize flow. Tonawanda only built small-block heads with 1.94/1.5 valves and no unshrouding cut, and didn't build any solid-lifter small-blocks; all solid-lifter small-blocks (and hydraulic-lifter L-79's) used 2.02/1.6-valves, and they were built only at Flint V-8. Flint had the transfer line station for the larger valves and the unshrouding cut, and Tonawanda didn't.
'69 Z/28
Fathom Green
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tmodel66

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Re: 69 DZ Blocks
« Reply #28 on: June 29, 2011, 03:49:02 PM »
Thanks Kurt and John. Forgot about the chamber cut. I was thinking in terms of machine shop work and not assembly line work which is apples and oranges. Every step has it's own tooling.
Daniel  
'69 SS 350/4 speed  Fathom Green--POP

L78 steve

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Re: 69 DZ Blocks
« Reply #29 on: June 29, 2011, 05:07:01 PM »
There was also machining under the valve so not to neck down the flow on the 202's
69 Z/28 Dover White X33,ZL2,PS,M20,Std.int.04C
67 SS/RS Mt. Green 1W,2LGSR,3SL,4K,5BY,07C
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