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#1
11-13-2025, 06:42 PM
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Early and later timing cover/WP have fan in same place?
Does the fan stick out the that same distance from radiator on early and late 8 bolt vs 11 bolt setups?
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#2
11-16-2025, 09:13 PM
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late model distance from WP hub to font of block where timing cover meets it 7 3/16". 65 GTO 389 6 5/16" so almost an inch shorter!
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#3
11-16-2025, 11:28 PM
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Skip,there is 2 diff length 11 bolt water pumps.Dont remember the exact diff.I know someone will have it.Tom
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#4
11-17-2025, 06:43 AM
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Quote:
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1966 GTO (Red) WARPATH 469CI TriPower 4-Speed 1965 GTO (Black) TRIPOWR 455CI TriPower 4-Speed 1965 GTO (Blue) 3X24SPD 464CI TriPower 4-Speed 1963 Tempest (Red) VIOLENT 440CI 2X4 Mag Nash / T400 (for now..) |
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#5
11-17-2025, 10:36 AM
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Late assume for a 78 motor
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#6
12-22-2025, 02:58 AM
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I'd say the difference is close to the stated 1" difference. Things get a little tighter when the engine is swapped to the later 11-bolt setup. On the '65 wagon the severe duty fan clutch ended up too close to the new Cold Case radiator so we went to the trouble of moving the radiator brackets an inch forward. I believe that Hayden now has a shorter shaft version of their severe duty fan clutch that would make things easy.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon. |
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