Engine Pad Surface - Broach Marks?
Thread Starter
Burning Brakes
Joined: May 2002
Posts: 751
Likes: 8
From: Escondido CA
Engine Pad Surface - Broach Marks?
Hello, Folks,
I am in the process of prepping my engine to go back into my 63 convertible. I am curious about the engine pad. Mine has always been blank, but I wonder if it is because it has been resurfaced or if it had never been stamped. Can anyone tell from this photo if those are broach marks or just a pattern created from resurfacing? The other numbers on the block are:
GM 3782870
F2 63
Thanks in advance!
I am in the process of prepping my engine to go back into my 63 convertible. I am curious about the engine pad. Mine has always been blank, but I wonder if it is because it has been resurfaced or if it had never been stamped. Can anyone tell from this photo if those are broach marks or just a pattern created from resurfacing? The other numbers on the block are:
GM 3782870
F2 63
Thanks in advance!
Last edited by kbuhagiar; Jun 7, 2008 at 08:30 PM.
Burning Brakes
Joined: Nov 2006
Posts: 809
Likes: 1
From: Houston Texas
check out the texture and broach marks from this thread.
http://forums.corvetteforum.com/show....php?t=2041727
Too me this is what it should look like, less the numbers. Otherwise its been decked.
http://forums.corvetteforum.com/show....php?t=2041727
Too me this is what it should look like, less the numbers. Otherwise its been decked.
Team Owner
Joined: Aug 2007
Posts: 58,061
Likes: 7,146
Army
For my education, can somebody post a picture of a stamp pad with an arrow to a broach mark(s) ? I keep hearing them talked about but have no idea what they are or should look like. Should a '61 block have them ?
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
The broach marks in Ken's blank pad photo at the top of the page look legit to me, as they exhibit the typical "chatter" in the direction of the marks; belt-sander duplicates typically have uninterrupted straight lines with no "chatter" marks.
Photo below is an original '62 pad, and shows typical longitudinal factory broach marks.
Team Owner
Joined: Aug 2007
Posts: 58,061
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Army
Thanks JohnZ - another tidbit of knowledge to go in the old memory banks ! My car is supposedly numbers matching/original motor:
VIN: 10867S108523 (Built May 18th, 1961)
ENGINE CASTING: 3756519 Casting Date: D271 = April 27th, 1961
ENGINE STAMP PAD: 108523F0502CU (Flint plant, May 2nd 1961, 270HP dual quad, solid lifters). My broach marks are not clear at all, although this is a pretty poor photo:
VIN: 10867S108523 (Built May 18th, 1961)
ENGINE CASTING: 3756519 Casting Date: D271 = April 27th, 1961
ENGINE STAMP PAD: 108523F0502CU (Flint plant, May 2nd 1961, 270HP dual quad, solid lifters). My broach marks are not clear at all, although this is a pretty poor photo:
Thread Starter
Burning Brakes
Joined: May 2002
Posts: 751
Likes: 8
From: Escondido CA
This begs the question: If not from resurfacing, why would the stamp pad be blank? Can application be determined based on the casting numbers (GM 3782870 F2 63)?
Le Mans Master
Joined: Jan 2005
Posts: 8,226
Likes: 2
From: Lake Wylie SC
The block you have was probably purchased over the counter from GM parts. If you look under the starting pad mounting block as when the block is spun upside down you might find another number there.
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Team Owner
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From: Washington Michigan
Team Owner
Joined: Nov 2005
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From: Beach & High Desert Southern California
Tonawanda foundry blocks were date coded with a two digit year "F2 63." All Flint foundry blocks were a single digit date code, with a similar date reading "F2 3." Corvettes only came with Flint blocks, so the "63" code reflects that this block did not come from a Corvette.
The block may be from the correct date year & month, but it was cast in the wrong foundry for a Corvette.
The block may be from the correct date year & month, but it was cast in the wrong foundry for a Corvette.
