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#1
02-12-2010, 08:51 PM
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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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#2
02-12-2010, 09:02 PM
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The heads are the same- the HP differences come from cam and exhaust differences.
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1966 GTO 1969 Lemans Convertible- F.A.S.T. legal family cruiser. 12.59 on G70-14 Polyglas tires. 1.78 60' 1969 Bonneville Safari- cross country family cruiser. . 1979 Trans Am 400, 4-speed, 4 wheel disc. View from the drivers seat racing down Atco Raceway- http://www.youtube.com/watch?v=GhYDMdOEC7A Ride along in the other lane-http://www.youtube.com/watch?v=mIzgpLtF_uw |
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#3
02-12-2010, 09:37 PM
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Yes.. All the same heads ... just the chassis and options, etc.... for the difference.
Firebird 400's (330-335hp)had the restricted carburetor linkage to cheat a lower advertised HP GTO 400's (350-360hp) were the same as the Firebird exept the four barrels opened fully.. FullSize models 390 HP 428 HO had the better exhaust manifolds than the GTO HO 400 and yielded the highest HP rating with the bigger engine , fully open carb and the great exhaust...
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63 Catalina coupe 467 cid budget drag car low 11's 1/4 , 7.0's 1/8th pump gas n/a 66 Star Chief Executive 59k mile 389 67 IH Scout project 2WD "Indian Scout" 69 Le Mans 2 dr HT 350 91k mile 15 sec 1/4 69 Firebird 400 Burgandy/Black 70 Olds Rallye 350 F85 4 speed 3.91's 70 Olds Cutlass Cruiser Red Wagon 350 108k miles 15 sec 1/4 12 sec w 455 74 Cheyenne Super C10 LWB Gen 6 454 w ZZ502 cam 3.07gear 13.1 1/4, 8.3 1/8 2020 RAM 1500 SLT 4x4 5.7 A8 Hemi 2008 Saab 9-3 2.0T convertible |
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