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TURNS OUT THERE ARE SOME DIFFERENCES BETWEEN THE PREVIOUS CARB POSTED
and the one I am posting now. CENTER CARB 1966 421 engine Syn Trans The 1966 Pontiac Tri-Power Carburetors information, as requested. (For verification of the Carburetor Calibrations that you have on your 1966 Engines. I will post the Center Carb: 7026074 info now. Same format, again, from the Rochester Products People in the way the information is presented by them. Air Horn Number: 7031588 (1) Venting: Internal 7007199 Vent Tube External Venting: Idle Vent Support: None Needle Seat: 7026305 Size: .120 Float Valve: 7022779 Pull Clip: 7006474 Float Assembly: 7012028 Spring: None Fuel Level: .625" at 6.0 psi Mech. Setting: .594" Drop: 1.97" (to sharp edge of seam at toe of float) Pump Assem: 7032280 (synthetic) RET Spring: 7004597 Size: .025" DUR Spring: 7011385 Size: .045" Pump Rod: 7025575 Length 3.06" Pump Jet: drill (2) Size: .026" Jet Location: In Cluster CAP cc/10 strokes: 18.0 - 21.0 Rod Set: .952 from air cleaner flange surface to top of pump rod Power Piston Assy: 7012266 act spring 7012265 Oz 8 Color (green) Power Valve Assy: 7011989 Power Rest: 7010148 Size: (.048) Metering Rod: (blank) Spring: (blank) Rod Size, Power (blank) Econ: (blank) Cut-In down at: 11 "Up" at: 8 all in at 6" hg MM. Jets: 322 cc, 60 degree, 7008662 "C" 7013333 Idle Compensator Assy: (140 degree (+ - 10 F) Opening Temp Choke Housing: (2*) (Some of the next 14 lines available for the Choke Description are blank) Here are the ones with Info: Valve No: 7033443 Angle: 20 degrees Cam No: 7020541 Choke Link: 7019524 Length: 2.671" wo Kick: .143 - .183 Second Step: .090 .100 Vacuum Break: 25 degrees + - 1.5 degrees (.168 - .192) Float Bowl (Finish) Float Bowl and Body Number: 7031576 Venturi Size: 1-3/16" Cluster: 7032380 (4*) Boost Size: 1/8 Nozzle: 7012877 rel .049 - .061 Idle Tube: 7011031 "C" Size: .031 Channel Rest: 7011523 Size: .046 Hi-Speed Bleed: drill (2) Size: .028 L.I.A.B: None Idle Bleed: None Top Bleed: .039 over idle tube Side Bleed: .033 Insert: (2) 7008866 (trumpet) Radial Tubes: (blank) Size: (blank) Crossover Chan: .125 Main Well Chan: None Throttle Body Assem: 7031569 Body & Bowl Assem: (blank) Thr Body No: 7031597 Bore: 1-11/16 Thr Valve: 7008903 Angle 10 degrees Idle Needle: 7029605 angle: 20 degrees Idle Needle Orifice: .074 - .078 All drilling info is blank Port Punch Length: .187 Width: .030 Port Punch Loc: .177 Top Valve Top Slot Other: 7032290 throttle body gasket 7020778 thr shaft lever assy 7024885 throttle lever No Hole in thr valve thr shaft offset .017 - .023 no spark port info Test Specification 7022221 Min Air: .45/ lbs min Idle Air rate: .55 lbs min Box Balance 17" Hg - 3" Hg (Note all 2 BBL carbs are tested at 3" of mercury (TV) Remarks: 7013333 idle comp assy 140 degrees F + - 10 degrees F opening temp (1*) 7021007 air horn gasket 7031590 nut - fuel inlet bend pump lever tang to open idle vent with .020 gage between thr valve & bore on side opposite idle needle. (2*) 7026097 vacuum break control assy 7026098 remote choke coil assy (3*) Service Pump Setting 1-21/64 + - 1/64 from top of die cast air horn ring to top of pump rod (4*) .026 dia hole aspirator to main well bleed date 3-19-1966 (notice the date change TV) Customer 1966 2G Pontiac (SYN) 421 engine A/C -NON A/C Center Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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