1968 #16 heads question of HP rating
I have a pair of #16 heads dated 1968 and am wanting to know what codes determine what horse power rating.
The dot clock in the rocker valley is at the 9 position, to continue. . . .
I have decoded:
9 pm on January 22nd of 1968
General Motors #16
The arrow to the 3 and the number 7 above the last exhaust port are my curiosity.
I found two #16 head codes for '68
1st code is for a 400 engine at 330, 335, 350, 360
cc 72 High Output
2nd code is for a 428 engine at 375, 390
cc 72
Thumbnail preview attached
Thanks for the insight
Alex
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