Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
|
|
|
#1
10-03-2009, 06:29 PM
|
|||
|
|||
Re: 291 Head Differences
[ QUOTE ]
Make sure they are both machined for the same style spark plug too. [/ QUOTE ] Also, make sure they're cast for the same size valve seat... 
|
|
#2
10-04-2009, 04:33 AM
|
|||
|
|||
|
Re: 291 Head Differences
They both use the same style park plugs and look to have the same size valve seats. I guess there were just different molds. Learn something everyday.
Jason
|
|
#3
10-10-2009, 04:55 AM
|
|||
|
|||
|
Re: 291 Head Differences
To be more precise, high-volume castings had multiple PATTERNS (made of cast iron or stainless steel); when sand was packed around the pattern, it created a sand mold. The sand mold was opened, the pattern was removed, and the mold was closed. Iron was poured in the sand mold, and the sand disintegrated on the "shake-out" table after cooling, when the raw casting was removed.
Each pattern was numbered and carried the casting number, casting date and hour clock; that appeared on each casting, and enabled internal traceability in the foundry back to the pattern in the event of a problem with a casting. The casting number, casting date, and pattern number were individual brass characters soldered to a brass plate that was pinned or screwed to a recess in the pattern; the date tag was changed every day, and the clock tag was changed every hour. Photo attached of tags from the Saginaw Foundry. 
__________________
'69 Z/28 Fathom Green CRG
|
 |
| Thread Tools | |
| Display Modes | |
|
|
Hybrid Mode
