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Original Message
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| It was probably added for structure. |
| By Dave Shoe - 03/29/2002 12:43:41 PM; IP 12.2.11.131 |
This refers to the high-exit "early" style of FE exhaust runner found on all 1958-65 FE heads, and also C6AE-R and CJ heads.
I suspect the rib was added to provide some structure. Perhaps the first heads of 1958 (or preprod) did not have the rib and it was learned they'd warp and leak when this thin area got warm.
All raised exit heads have the extra material which makes up that rib, but some actually "fill-in" the area behind the rib, perhaps to provide a smooth flow.
The CJ heads I've seen have this area filled-in. A few of the C6AE-R (and similartruck and marine castings) also backfill behind the rib, but I've seen these both ways. I tend to find the 1965-earlier heds have the rib, though I suspect you may find some 427LR or 406 castings with it backfilled.
Just posting my hypotheses. I don't have any first-hand info on the vertical rib.
Also, I do believe I've seen whare ths rib is occasionally removed during porting. It would seem to really open up the transition to the header, assuming the header flange was oversized to fit the opening, and assuming the head has sufficient structure when the outside curve of the exhaust runner starts to glow a dim red during a race.
Shoe. |
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This thread, so far...
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