Brand new Delco HEI
02-09-2019, 11:01 AM
#21
Safety Car
Wow, .077 end play is about 6 degrees of timing slop at .013 per degree. That would be considered high wear on an old used distributor let alone a new one. Whoever made that wasn't big on tolerances....
02-09-2019, 12:05 PM
#22
Le Mans Master
The cam gear is not like the stock gear. It is a melonized gear. You can read up on it yourself, and decide if you want to use that with a 40 year old camshaft.
Last edited by Bikespace; 02-09-2019 at 12:06 PM.
02-09-2019, 02:21 PM
#23
Le Mans Master
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My NOS ZZ4 takeoff from eBay (ACDelco 93440806, same part number, and available new from Amazon), which had probably been sitting on a shelf for 10 years, had the same endplay. I added a Moroso shim kit, an adjustable vacuum can, and changed the springs, and its been great on the 79.
The cam gear is not like the stock gear. It is a melonized gear. You can read up on it yourself, and decide if you want to use that with a 40 year old camshaft.
The cam gear is not like the stock gear. It is a melonized gear. You can read up on it yourself, and decide if you want to use that with a 40 year old camshaft.
… not certain but think it was old GM pn 1104067.
Last edited by jackson; 02-09-2019 at 02:22 PM.
02-09-2019, 07:32 PM
#24
Le Mans Master
Thread Starter
I used to set them at .010". Now I use .015". Some say .020". I will settle this later in this thread.
02-09-2019, 07:33 PM
#25
Le Mans Master
Thread Starter
Top to bottom. MSD Streetfire gear, Delco HEI gear, NOS Delco # 10456413 gear, and a nice used GM tach drive gear.
Last edited by Big2Bird; 02-09-2019 at 07:36 PM.
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02-09-2019, 07:40 PM
#26
Le Mans Master
Thread Starter
A lot of boat guys cut a slot in the housing so a little pressurized oil sprays down on the gear right before it meets the cam gear.
02-09-2019, 08:33 PM
#27
Le Mans Master
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I recall some aftermarket distributors/mags were sold new with o-ringed grooves in the two bosses … and some guys would machine o-ring grooves in theirs that hadn't come with them … go figure.
02-09-2019, 09:32 PM
#28
Le Mans Master
Thread Starter
I think some new MSD units have them, and you chamfer the block to keep from cutting the o -rings.
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02-10-2019, 07:57 PM
#31
Le Mans Master
Thread Starter
02-10-2019, 07:58 PM
#32
Le Mans Master
Thread Starter
02-10-2019, 08:00 PM
#33
Le Mans Master
Thread Starter
Wow, .077 end play is about 6 degrees of timing slop at .013 per degree. That would be considered high wear on an old used distributor let alone a new one. Whoever made that wasn't big on tolerances....
02-10-2019, 08:06 PM
#34
Le Mans Master
Thread Starter
Out of the box, 18* crank advance from 900 RPM all in by 2900RPM.
Vacuum can starts at 3" and is all in at 6.5" for 9*, or 18* crank. nearest can would be a VC1862.
Vacuum can starts at 3" and is all in at 6.5" for 9*, or 18* crank. nearest can would be a VC1862.
02-11-2019, 12:31 PM
#35
Safety Car
What kind of overall numbers are you going to go for? Nice Sun Machine! Getting expensive and hard to find a nice one.
02-11-2019, 12:49 PM
#36
Le Mans Master
Thread Starter
The vacuum I need to limit to 5*
Thank you. I looked for a year to find this one. I still actively collect Sun goodies. I even have some of the Sun tech service equipment to calibrate them.
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02-11-2019, 03:05 PM
#37
Le Mans Master
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Article: Hemmings Lost Art of Servicing GM HEI
from 2008 Hemmings
Lost Art of Servicing GM HEI
https://www.hemmings.com/magazine/mu...I/1719426.html
Lost Art of Servicing GM HEI
https://www.hemmings.com/magazine/mu...I/1719426.html
02-11-2019, 03:22 PM
#38
Team Owner
I doubt it...the last time that Pontiac made a liberal number of their "original" V-8 engines was 1978, in the 400 cu/in variety, and they "stockpiled" some to be used in 4 speed manual equipped, 1979 Trans Ams. After that, they did make a "bastardized" 301 cu/in version, for a couple of years. So I'm assuming that there isn't that big a market for them. DUI offers a Pontiac version of their distributor, so I've read.
02-11-2019, 04:05 PM
#39
Tech Contributor
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from 2008 Hemmings
Lost Art of Servicing GM HEI
https://www.hemmings.com/magazine/mu...I/1719426.html
Lost Art of Servicing GM HEI
https://www.hemmings.com/magazine/mu...I/1719426.html
02-11-2019, 04:06 PM
#40
Le Mans Master
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not acdelco
https://www.summitracing.com/parts/sum-850007