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April 29th, 2009, 01:58 PM
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#1 (permalink) |
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Moderator
Join Date: Sep 2006
Location: Medford, Oregon
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Different castings on C heads
I have a question about C heads. I've seen them with both small oval holes for the heat crossover and large rectangle holes like other heads. Anybody know why the factory cast some with the small ones and large rectangle on all the other heads? John
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1964 Cutlass Factory 4spd 1965 442 4spd 1967 442 Auto 1967 Cutlass Convertible 1967 Cutlass four door daily driver 1968 442 Auto 1969 442 W30 Auto 1970 442 4spd 1971 Cutlass Flat Top Wagon 1973 Che*vy 3/4 Ton 454/TH400 Tow Vehicle Only the tow vehicle is finished! |
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April 29th, 2009, 02:29 PM
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#2 (permalink) | |
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Super Moderator
Join Date: Mar 2007
Location: Northern VA
Posts: 4,396
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Quote:
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Joe Padavano 64 Jetstar 88 Conv 66 442 L-69 Conv 68 W-30 69 H/O 69 442 70 W-30 72 442 84 Custom Cruiser 86 Caprice wagon (w/307 Olds) |
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April 29th, 2009, 02:53 PM
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#3 (permalink) |
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Super Moderator
Join Date: Nov 2007
Location: Bothell, WA
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New one on me, I have only seen the larger holes
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 Pat 1957 Super 88 with a 455 1948 2dr series 76 with a 455 |
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April 29th, 2009, 07:48 PM
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#4 (permalink) |
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Moderator
Join Date: Sep 2006
Location: Medford, Oregon
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The small crossovers are C's that came off a 1968 Toro engine. I have seen at least one other set that I pulled a set off a 1967 425 engine. They only have a large C in the casting, is the Ca like the Ga and Ka heads with a small capitol letter down low on the right? Here's the casting letter and the casting numbers. The numbers look to be the same as well.
  John
__________________
1964 Cutlass Factory 4spd 1965 442 4spd 1967 442 Auto 1967 Cutlass Convertible 1967 Cutlass four door daily driver 1968 442 Auto 1969 442 W30 Auto 1970 442 4spd 1971 Cutlass Flat Top Wagon 1973 Che*vy 3/4 Ton 454/TH400 Tow Vehicle Only the tow vehicle is finished! |
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April 29th, 2009, 09:22 PM
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#5 (permalink) |
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Registered User
Join Date: Mar 2007
Location: West of Lubbock, TX
Posts: 160
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I have a couple of sets with the small hole. One pair came off a '68 98, but I'm not sure what the other set was on.
DW |
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May 3rd, 2009, 12:12 AM
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#6 (permalink) |
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Registered User
Join Date: Mar 2008
Posts: 337
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Later lettered heads have the big hole so I expect the C heads with the big hole are late 60s. The C heads I have came off 67s mostly and they have the small hole. I guess the factory went to the big hole for easier removal of the sand core.
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