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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old April 11th, 2019, 01:06 AM
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FetchMeAPepsi FetchMeAPepsi is offline
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Default Getcha Motor Runnin - Engine Tuning Specs for 305 V6

Motor's on the list for tomorrow. Here's the plan to set stuff at:


Base Timing: 12* @ 600 rpm
Dwell is 30* - How do I set Dwell?
Carb idle adjust to bogged down, then back out 1/4 turn.

What else should i look at?
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Some people are like slinkys. Not worth much but funny as heck when pushed down stairs.
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Old April 11th, 2019, 01:40 AM
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Default Re: Getcha Motor Runnin - Engine Tuning Specs for 305 V6

Go to Jolly legacy page. Click engine data at top. Scroll to specs. Timing says 5 BTDC. Dwell is read with a dwell meter. It's a way to tweak (micro) the point gap after feeler gauge (macro). If you're lucky enough to have the window dizzy, you turn the allen wrench while watching meter......observing motor. 28-35. Keep checking timing as you mess around. Nice to have good/known/new, points, rotor, cap, plugs, wires, condenser. Otherwise you are apt to run in circles. Don't forget to take hose off of dizzy and plug it while timing only. Post back if you get in a jam. You are good at this stuff. Your kids have taught you well.

What is the reason for trying to screw up your motor? Tune up or something wrong?

The carb/fuel system is another story. Tune up electrics first to the correct numbers and good parts.

Before you start, get good visible marks on harmonic balancer and pointer at 0 and etc.

Last edited by AZKen; April 11th, 2019 at 02:04 AM.
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Old April 11th, 2019, 02:20 AM
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Default Re: Getcha Motor Runnin - Engine Tuning Specs for 305 V6

I forget Jolly's page is there. he doesn't post anymore

Here's the data so it's on this post too:


Quote:
Maximum Recommended Speeds in rpms:
305A V6 -- 3600
305B V6 -- 3600
305C V6 -- 3800
305D V6 -- 3400
351 V6 -- 3400
401 V6 -- 3200
478 V6 -- 3200
702 V12 -- 2400

Valve Lash (Hot, Running)
All V6s: Intake -- 0.012", Exhaust -- 0.018"
V12 -- Zero

Cylinder Head Bolt Torque -- 65-72 ft-lbs

Idling Speed, Manual Trans, 400 - 450 rpm, Auto trans, 450 rpm

Spark Plugs Gap;
305A, 305B & 305D -- 0.030"
305E & 305C 0.035"
351, 401, & 478 0.030"
Ignition Timing -- 5 degrees before TDC

Distributor V6 Dwell -- 28 - 35 degrees, Point gap -- 0.016



Since I don't have a dwell meter, how would i set point gap and dwell etc?
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Some people are like slinkys. Not worth much but funny as heck when pushed down stairs.
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Old April 11th, 2019, 02:44 AM
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Default Re: Getcha Motor Runnin - Engine Tuning Specs for 305 V6

The Jolly page is where all the 6066 Data is kept. VIN decoder, part numbers, specs, model differences, hub caps and much other needed info.
You can't check dwell without a meter. You can set the points with a .016 feeler gauge. Your knees and back and neck will need medical attention after. Take neg battery cable off. Take off the cap and rotor. You have to rock the truck in gear or turn the motor to get the point's phenolic "follower" up on a distributor lobe. Fiddle the feeler in, parallel and between point pads/contacts and adjust screw to get a slight drag of the gauge.

If your distributor (Dizzy) has a "window" with lift up "door", I would get a dwell meter. They are cheap. They also have an RPM scale for setting timing, carb, etc. Be sure it will read 8 Cyl AND 6 Cyl. SO MUCH easier to set points, you do it with motor running, no lobe on cam or gauge no climbing on motor. Just open the window and use an allen on the screw. Dwell meter is obsolete. Ebay is the best place. $5 and up.

I don't mean to be explaining something you already know.

Last edited by AZKen; April 11th, 2019 at 03:21 AM.
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Old April 11th, 2019, 03:27 AM
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Default Re: Getcha Motor Runnin - Engine Tuning Specs for 305 V6

Quote:
Originally Posted by AZKen View Post
The Jolly page is where all the 6066 Data is kept. VIN decoder, part numbers, specs, model differences, hub caps and much other needed info.
You can't check dwell without a meter. You can set the points with a .016 feeler gauge. Your knees and back and neck will need medical attention after. Take neg battery cable off. Take off the cap and rotor. You have to rock the truck in gear or turn the motor to get the point's phenolic "follower" up on a distributor lobe. Fiddle the feeler in, parallel and between point pads/contacts and adjust screw to get a slight drag of the gauge.

If your distributor (Dizzy) has a "window" with lift up "door", I would get a dwell meter. They are cheap. They also have an RPM scale for setting timing, carb, etc. Be sure it will read 8 Cyl AND 6 Cyl. SO MUCH easier to set points, you do it with motor running, no lobe on cam or gauge no climbing on motor. Just open the window and use an allen on the screw. Dwell meter is obsolete. Ebay is the best place. $5 and up.

I don't mean to be explaining something you already know.
I don't know any of that, so you're good. I'll take a peek at it in the morning!

Thanks!
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Some people are like slinkys. Not worth much but funny as heck when pushed down stairs.
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Old April 11th, 2019, 04:10 AM
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Default Re: Getcha Motor Runnin - Engine Tuning Specs for 305 V6

The only time feeler gauges are accurate is when the points are new. After a while points develop a peak and valley shape. Gradual, then extreme. Dwell meter is much better in those stages.
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Old April 11th, 2019, 05:20 AM
jagarra jagarra is offline
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Default Re: Getcha Motor Runnin - Engine Tuning Specs for 305 V6

NAPA still has the cap with the window, lots more expensive than I remember, but worth it if you have a dwell meter. Had to scour e-bay to find an adjusting tool with the flexable shaft, they are still out there but getting scarce.

If you are checking e-bay for a meter try using Penske dwell meter, there are a few on there, I have had one since I was in high school, great meters with a lot of features. some with 4-6-8 cylinders settings.

Last edited by jagarra; April 11th, 2019 at 04:14 PM.
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Old April 13th, 2019, 02:50 PM
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Default Re: Getcha Motor Runnin - Engine Tuning Specs for 305 V6

Or search for Peerless
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