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#1
08-11-2006, 09:53 PM
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CAM INSTALLATION
A FRIEND OF MINE IS PUTTING AN 068 CAM INTO HIS 67 GTO. THE MOTOR IS A 75 400 BLOCK WITH 670 HEADS. HE ASKED WHERE THE CAM/CRANK GEAR TIMING MARKS SHOULD BE. MY 67 SERVICE MANUEL AND CHILTON BOOK HAVE THE TIMING MARKS AT 6 & 12. HE TOOK HIS TIMING COVER OFF AND SAID THE MARKS WERE AT 12 & 12. WHICH WOULD BE CORRECT
THANKS |
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#2
08-11-2006, 11:23 PM
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turbo 400,
with the #1 cylinder at "tdc", your timing marks should be at 12 & 12. This will put #1 spark plug ready to fire. At 6 & 12 #6 cylinder would be ready to fire. It can be set up that way but you have to time everything to the #6 cylinder, otherwise you will be 180 deg. off, not good. I always set mine to 12 & 12, with #1 at "tdc", no problems. Mark
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1965 GTO: 467 (Built By Dan Willever), 400 Block, Eagle 4.25 Stroke, Eagle 6.8 Rods, BRC Pistons, Custom Grind Hydraulic Roller Cam, Edelbrock 72cc Heads Ported, HS Rockers, Doug's Headers, Edelbrock Victor 4150, QTF 850 Carb, AutoGear M22 4 Speed, SPEC Clutch and Pressure Plate, 12 Bolt 3:73 Posi. 
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#3
08-11-2006, 11:41 PM
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i install mine at 6 and 12 cause it is easier to make sure the dots line up but i rotate the engine to 12 and 12 before i install the dist
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70 GTO 462 E-Heads TKO-600 9-Inch/3.60's |
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#4
08-12-2006, 12:56 AM
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Ya, can be done both ways. I'd do it however it was done before in order to preserve the plug wire routing and such.
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69 firebird |
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#5
08-12-2006, 01:06 AM
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my summit double roller directions indicate 6 and 12 which i followed, with stock wiring configuration...bet these alternate opinions sure help
 ...
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'74 formula 400, w/shaker (3 scoops) black deluxe interior, '70 406 balanced assembly, .30 trw slugs, moly rings, 4x heads 2.11/1.77 stainless valves, ra 4 cam, e-rpm intake, holley 750 vac. sec, msd hei, hooker headers w/ dual 3'' flowmaster 50 series ending at axle, t400 w/ GM6 convertor, transgo shift kit, b&m starshifter, 3.08 gears, centerlines, 265/50-15 bfg's rear and 235/60-15 front...yes im over cammed but it is still very fun... |
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#6
08-13-2006, 02:48 PM
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6 & 12 or 12 & 12, both ways will put the cam in the correct timing phase. Turn the engine over one rotation with the timing chain installed and 6 & 12 becomes 12 & 12 pretty easily.
 As mentioned, 12 & 12 will put the cam in the right place to install the distributor with the rotor pointing at #1 firing position.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#7
08-13-2006, 08:11 PM
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I always do mine like Billy177 says: "i install mine at 6 and 12 cause it is easier to make sure the dots line up but i rotate the engine to 12 and 12 before i install the dist"
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"An over torqued bolt is already half broken" |
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