Does anyone know which engines had heads with a 72 cast into the top near the #1 and #8 plugs? I have a 71 350 block with these 72 heads on it. Also, since the 71 to 72 GS350 had quite a drop in HP, from 260 down to 195 I believe, did a large part of the HP loss come from the heads being changed?

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David Gramlow
1968 GS350
GSCA 861

[This message has been edited by dg-gs350 (edited 11-03-2001).]