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Re: 1970 c20 350 vs Toyota I force 5.7
This was the info I pulled for the casting number, as per Super Chevy,
"Look for casting number 12558062, but avoid casting number 10239906, which has a modified exhaust seat and loses 20 percent of its flow at 0.120-inch lift."
The casting will have triple triangles, and look like the under bite of a classic carved pumpkin, to use an upcoming festive analogy. It's located between two accessory holes.
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