I want to change out my distributor today and I need to know what size it is to make a timing tape. I know it's right around 6 inches, but I need to know exactly. What sizes do they make that are right around 6 inches? It's an 89 350.

Also, do I put blue silicone on both sides of the gasket, or just on the top part where it contacts the distributor? Thanks.

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1986 CAMARO Z28 ->
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, B&M Ripper shifter, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, all bushings are urethane, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH 3300lbs less driver and speakers Next mods-> Extreme Energy 268 cam, Holley street dom intake.

1987 TRANS AM ->
73,000 miles, 305TPI, auto, gutted air box.

 

I wont answer what size, because I'm not positive. So I'll let someone else catch that one.

Dont put ANY sealer on the distributor gasket whatsoever. Thats what the gasket is for.

 

6 5/8" i think

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ICON Motorsports

1st & 3rd
MM Black Diamond Lodge 538 F&AM

 

1000% sure it is 6-3/4" Diameter. Only other size for an SBC would be 8", but that was for the '60s-'70s muscle cars (hi-po engines) and maybe HD trucks.

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George P. Lara
1984 "L69 A4"
Soon to be 357 T5
1994 LT1 M6
SCCA, SCFB, SC3GFB

 

where do I hook up the vaccuum advance line to the carb for the vaccuum advance on the distributor? I have a holley 650, mech secondaries, spreadbore.

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1986 CAMARO Z28 ->
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, B&M Ripper shifter, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, all bushings are urethane, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH 3300lbs less driver and speakers Next mods-> Extreme Energy 268 cam, Holley street dom intake.

1987 TRANS AM ->
73,000 miles, 305TPI, auto, gutted air box.

 

Why don't you just measure it?

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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter