I have a set of Butler 290 cfm D port E heads shaved from 87 to 81cc in the bird. And on the shelf I have a set of 85cc KRE 310 D ports. Both have the heart shaped chamber design and folks on here have had great results with both. One thing I recall with a friend’s set of off the shelf KRE D-Ports is Paul Carter built the engine and said some of the threads for the rocker arms pulled out of the heads and he had to install heli-coils. It’s my understanding E-heads have steel thread inserts in all or most areas.
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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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