I went through this with my bird which has a the same cam specs, LB manifolds and an RPM intake - I bought from Butler and had them ported so there is room for growth later. Also, this ensured the went over the heads rather than selling as cast and them not being looked at. I don’t regret the decision one bit.
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Will Rivera
'69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears
'64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded)
'69 LeMans Vert, 350, #47 heads: Non-running project
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