The Cars > GT40 - Original/Mk V

C8FE block

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shelbydoug:
The casting ID on a 69 Boss 302 is C8FE.

Is this the same block that is run in the '40s running the Boss 302?

Are they the same castings?

Is there a difference between it and the C7FE block?

camp upshur:
 
the C8's XE predecessor which I've see were similar save for the freeze plugs-see attached.
Boss powered GT-40s, in period?

shelbydoug:

--- Quote from: camp upshur on August 08, 2021, 02:27:33 AM ---
the C8's XE predecessor which I've see were similar save for the freeze plugs-see attached.
Boss powered GT-40s, in period?

--- End quote ---

Yes. After the 67 racing season, the rules were changed to eliminate the 7 liter engine and reduce the maximum displacement allowed to 5 liters.

In '68, the GT40's were run with 5 liter Boss 302's and renamed "Gulf's" and run with the Gulf colors and "spoked" wheels.

While the 4 bolt 289 blocks previously were last cast as C7FE blocks and sourced from the racing program, the Boss blocks (in 68) were C8FE blocks.

I presume that these were also "trans-am racing blocks", like the '67s, but what I am asking is since the C8FE blocks were production blocks for the '69 Boss 302, is there a difference or are they still racing blocks?

Royce Peterson:
The C8FE blocks were originally designed and cast as production 1968 tunnel port 302 blocks. When the tunnel port 302 production was cancelled lots of them were already cast. They ended up being used in early 1969 Boss 302 production.



--- Quote from: shelbydoug on August 08, 2021, 06:31:57 AM ---
--- Quote from: camp upshur on August 08, 2021, 02:27:33 AM ---
the C8's XE predecessor which I've see were similar save for the freeze plugs-see attached.
Boss powered GT-40s, in period?

--- End quote ---

Yes. After the 67 racing season, the rules were changed to eliminate the 7 liter engine and reduce the maximum displacement allowed to 5 liters.

In '68, the GT40's were run with 5 liter Boss 302's and renamed "Gulf's" and run with the Gulf colors and "spoked" wheels.

While the 4 bolt 289 blocks previously were last cast as C7FE blocks and sourced from the racing program, the Boss blocks (in 68) were C8FE blocks.

I presume that these were also "trans-am racing blocks", like the '67s, but what I am asking is since the C8FE blocks were production blocks for the '69 Boss 302, is there a difference or are they still racing blocks?

--- End quote ---

camp upshur:

The gulf cars ran inline valves on Gurney-Weslake heads. Never seen a period GT-40 w canted-valve Boss 302-yet.

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