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781/049 heads intake runner CSA?

1051 Views 2 Replies 3 Participants Last post by  steelcomp
Has anyone ever measured the stock gm oval port heads True intake cross sectional area? Is It really that big that is advertised.
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Mt 781's before porting were 255cc's the biggest ovals I cc'ed were the 290 castings that cam in at 265 to 267cc's and I thing they were closed chambered heads. Maybe Mark will chime in on the csa.
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