Dwell angle on 350 SB - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69 XCamper · 03-09-2003, 02:03 PM

My 69 350 SB engine was running a little rough, so I checked the plugs and they looked normal. I then tried to adjust the dwell angle. My shop manual says it should be between 29-31 degrees. I could only get it down to 34 degrees. If I adjusted the points either way, it would go up & over 40. Does this mean my points are worn? I also checked the timing and it was at 2 degrees BTDC. My manual doesn't list the correct timing specs, it says to look at the Vehicle Emission Control Information label in the engine compartment...well, my label is long gone. Anyone know the correct timing for my engine? I still have the original smog pump hooked up.

**too much stuff** · 03-09-2003, 02:23 PM

Your breaker gap should be .019 (points) 28-32 should be the dwell angle. Timing should be TDC on standard trans, 4 degrees with an auto trans. hope this helps.

Longhorn Man · 03-09-2003, 05:14 PM

You ever thought of installing an HEI dist. ? You'd never have to deal with any of the dwell/points/adjusting stuff again.

lpaine · 03-09-2003, 07:18 PM

man, I thought I was old-fashioned, I would love to help you out on that one, but I've never touched a points dizzy, do yourself a huge favour and drop an h.e.i. in there, it'd be the simplest single improvement and best bang for your money. It'll start quicker and run smoother guaranteed plus you won't have to ever worry about points and condenser again. But if you really want to keep your truck all original then keep it.

bobs409 · 03-10-2003, 09:14 AM

Put in a new set of points and a new condensor. Then set to 30 degrees with a dwell meter. Then set the timing.

Nothing wrong with points if they are changed every 12,000 miles and kept adjusted.

sam's 72 · 03-10-2003, 11:22 AM

H.E.I. You will not regret it!
Sam

Long Knight · 03-10-2003, 02:53 PM

I put a pertronix ignitor in my truck. Got it from Autoworks out of Cali. The sticker on my air cleaner says timing should be 6 degrees btc.

03-09-2003, 02:03 PM	#1
69 XCamper Registered User Join Date: Feb 2003 Location: Lake In The Hills, IL Posts: 28	Dwell angle on 350 SB My 69 350 SB engine was running a little rough, so I checked the plugs and they looked normal. I then tried to adjust the dwell angle. My shop manual says it should be between 29-31 degrees. I could only get it down to 34 degrees. If I adjusted the points either way, it would go up & over 40. Does this mean my points are worn? I also checked the timing and it was at 2 degrees BTDC. My manual doesn't list the correct timing specs, it says to look at the Vehicle Emission Control Information label in the engine compartment...well, my label is long gone. Anyone know the correct timing for my engine? I still have the original smog pump hooked up. __________________ 69 Chevy C20 (stock & waiting) 69 Datsun Roadster SPL311 (still waiting for resto) 02 Hyundai Elantra GT 00 Ford Expedition 99 Coleman Utah Lake In The Hills, Illinois

03-09-2003, 07:18 PM	#4
lpaine Registered User Join Date: Oct 2002 Location: Parksville, B.C. Canada Posts: 637	man, I thought I was old-fashioned, I would love to help you out on that one, but I've never touched a points dizzy, do yourself a huge favour and drop an h.e.i. in there, it'd be the simplest single improvement and best bang for your money. It'll start quicker and run smoother guaranteed plus you won't have to ever worry about points and condenser again. But if you really want to keep your truck all original then keep it. __________________ 1969 G.M.C 3/4 Ton 920 (Canadian Version) 307 3 speed, currently apart 1998 Chevy 1/2 ton ex cab V-6 5 speed 1967 Chevy SWB - project truck; not started just yet

03-10-2003, 09:14 AM	#5
bobs409 1969 Custom 30 wrecker Join Date: Sep 2001 Location: Pottsville, Pa Posts: 2,611	Put in a new set of points and a new condensor. Then set to 30 degrees with a dwell meter. Then set the timing. Nothing wrong with points if they are changed every 12,000 miles and kept adjusted. __________________ Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10

03-10-2003, 11:22 AM	#6
sam's 72 Senior Member Join Date: Nov 2001 Location: Pasadena, Texas, USA Posts: 1,005	H.E.I. You will not regret it! Sam __________________ 72 LWB chevy truck. Pasadena, Texas

03-10-2003, 02:53 PM	#7
Long Knight Spank 'em if you got 'em! Join Date: Nov 2002 Location: Kansas City Posts: 628	I put a pertronix ignitor in my truck. Got it from Autoworks out of Cali. The sticker on my air cleaner says timing should be 6 degrees btc. __________________ Long Knight '71 C-20, 350ci, TH350, Edl. 1406 Carb w/elec.choke, Ignitor ignition, Viper Tires, Orange Dipstick

03-09-2003, 02:23 PM	#2
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,787	Your breaker gap should be .019 (points) 28-32 should be the dwell angle. Timing should be TDC on standard trans, 4 degrees with an auto trans. hope this helps.

03-09-2003, 05:14 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	You ever thought of installing an HEI dist. ? You'd never have to deal with any of the dwell/points/adjusting stuff again.



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