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#21
07-15-2022, 05:19 PM
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Sounds like pushrods may be too long. Billk
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#22
07-20-2022, 11:34 AM
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Hey Tom, I guess my first question would be, do you have the stock pressed in rocker studs? I have Crane Cam roller tip rockers and Poly Locks on my RAM AIR III motor. Nunzi replaced my press in studs with 7/16" "Ford or Chevy" style studs. Once I moved to poly lucks, they did not grab enough threads of those studs so I replaced those with ones a 1/4" longer and none of them hit the stock valve covers. Does that help?
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#23
07-20-2022, 11:38 AM
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It's not enough. I have broken 2 Rocker studs this way. SCARY!!!
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#24
07-20-2022, 02:55 PM
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I don't believe 6X heads ever came with press in studs. I have 7 full threads of engagement
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Tim Corcoran |
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#25
07-20-2022, 04:00 PM
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I have Comp 1.5 roller rockers and their accompanying poly locks on a 6X head. Valve train geometry was carefully setup by Len Williams in Tulsa. They did not fit under my "vintage" M/T valve covers with the 5/16" gasket. I had to add the 3/8" RA IV spacer from Butler Performance to get enough room to clear the poly locks. This turned into a nightmare as the rear bracket for the A6 compressor no longer fit over the valve covers without massive spacers and that threw the compressor swing out of alignment. Final fix wound up being a $1700 CVF serpentine kit.
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#26
07-20-2022, 05:19 PM
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You can always just run a Chevy type one time usage jam nut, just do your adjustment very carefully.
Even if you have to buy 32 Jam nuts that’s massively cheaper then going for a 1700 buck belt drive system just to be able to adjust your valves!
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I do stuff for reasons. |
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#27
07-20-2022, 06:14 PM
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M/T valve cover are about the shortest pontiac VC ever made!Designed in about 1959.Tom
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#28
07-20-2022, 06:48 PM
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Yes ,which means they where designed for the valve inclination angle of the 389 and 421 heads who’s valves do not stand up as high above the valve cover plane.
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I do stuff for reasons. |
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#29
07-21-2022, 11:59 AM
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Quote:
 However, the serpentine kit did come with a new power steering pump, 140 amp alternator and R134A compressor....and now I've got a complete set of 1970 Firebird engine accessory brackets to sell. And with the spacers powder coated, they matched the valve covers pretty well. 
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#30
07-21-2022, 01:56 PM
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With Norris SS rockers and their short [poly locks M/T fit fine on my RAIV heads.
__________________
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 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
| The Following User Says Thank You to Skip Fix For This Useful Post: | ||
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