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11-07-2008, 08:04 PM | #1 |
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Six cylinder distributor: Points vs HEI
Lately I've been reading where a lot of you strongly recommend HEI distributors on these old trucks so I'm starting a one month test on my 68 GMC six cylinder 250 with single barrel carb.
Now, I'm very familiar with HEI's since my 69 with 350 has one on it and of course most of the vehicles I've owned in the last 30 have had them. But, I had read some 15 plus years ago in some old cars magazine that there wasn't much to gain on a stock six banger with single barrel by converting it, so I decided to test it myself. I went to a local salvage yard and picked up an HEI with the integrated coil and vacuum advance on it. Here's my plan: Since I don't have anyway to measure horesepower I will monitor the gas mileage and daily operation and report back. If I notice a tremendous change in operation and gas mileage right away I will let you know. |
11-07-2008, 10:02 PM | #2 |
its all about the +6 inches
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Re: Six cylinder distributor: Points vs HEI
also pay attention for easier starting, better idle, better throttle response, better low end torque as seen by needing less throttle to take off from a stand still and less down shifting... also not how often you won't have to mess with the points.
The magizines were most likely talking about power wise, and since they pretty much always crapped on the inlines, they said it wasn't worth it. heck, in 75, all the mags were telling you how to get rid of the 'newfangled' HEI 'junk' and swap over to a 'tried and true' points ignition system. That would be like an article on putting a carb on a Z06 vette today. |
11-08-2008, 12:12 AM | #3 |
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Re: Six cylinder distributor: Points vs HEI
I hear you on the points thing. I'm hoping to see some difference in mpg. I was getting 16-1/2 to 17 with the points on the highway so we'll see if it gets improves some.
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11-08-2008, 07:07 AM | #4 |
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Re: Six cylinder distributor: Points vs HEI
I seriously doubt you will go back.I have to say that of all the mods to my truck, theHEI made the most difference in driveability.Rebuilding the front end helped a lot,lowering helped some,new brakes were good,but just for being able to drive,lug the ole six down some and acceleration the HEI wins.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" Last edited by PanelDeland; 11-08-2008 at 07:07 AM. |
11-08-2008, 10:07 AM | #5 |
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Re: Six cylinder distributor: Points vs HEI
I am doing HEI conversion om my 292 6 cyl today. Looking forward to all the improvments I have heard about!
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11-25-2008, 10:47 AM | #6 |
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Re: Six cylinder distributor: Points vs HEI
Update... So far Disappointed. But then again, this is a 250 six cylinder with 1 barrel rochester.
I installed the hei on my 68. I took it off a 6 cylinder van and it looked pretty decent. Had no noticeable wear. I replaced the cap and rotor, replaced the spark plugs, and the wires then regapped to .045. On this 250 which has real low mileage (30K now) I did not notice any difference in the power area. But I also don't do much speeding. I just mainly toodle around town with an occasional run to an out ot town property that's 25 miles out. Gas mileage actually went down to 14.5 mpg from around 15.5 and I found out I had a miss at around 65 mph. I think this was because I had a vacuum leak on the carb base gasket. I've swapped back to the points distributor and will run it for a couple of weeks the same way I did the HEI and repost my findings. |
11-25-2008, 11:03 AM | #7 |
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Re: Six cylinder distributor: Points vs HEI
A properly maintained point distributor works fine, HEI though is set it and forget it, unless you rust the rotor or crack the cap, heh. I personally have never touched a distributor unless one of my junkers refuses to start.
Last edited by Elephanthead; 11-25-2008 at 11:04 AM. Reason: retarded at English |
11-25-2008, 11:06 AM | #8 |
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Re: Six cylinder distributor: Points vs HEI
I will be watching this thread closely as I am replacing the carb on my 6 soon (as soon as it arrives) and my next step will probably be HEI once I get everything with the carb straightened out.
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11-25-2008, 12:35 PM | #9 |
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Re: Six cylinder distributor: Points vs HEI
i've tried this swap twice and really didn't see much in the way of performance difference on either occassion. To me, it's just more a matter of convenience in not having to fool with points. this last time I tried one of those petronix kits on the 250 in my 69. in my opinion that performs just as well as the hei swap and is about the same price.
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11-25-2008, 03:58 PM | #10 |
Out of the carpool lane.
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Re: Six cylinder distributor: Points vs HEI
68gmsee, did you advance the dist. to around 10-12* ? The old points like around 4-6*, but you can increase that for HEI. By doing so I think it burns the fuel better, giving better mileage.
So it's unclear in your last post as to what you attribute the drop in mpg's. Do you think it's the HEI as opposed to your vacuum leak?
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1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten... |
11-25-2008, 04:32 PM | #11 |
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Re: Six cylinder distributor: Points vs HEI
I did the Pertronix Ignitor conversion on the stock distributor a couple months back. I've got a stock 250 with the single barrell carb as well.
The results made me really happy on the ride home. Super quick starts and noticeable lack of throttle use is a huge bonus. And the install makes any monkey (like me) feel like an electrician. Best upgrade under $100 I've made. |
11-25-2008, 05:03 PM | #12 | |
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Re: Six cylinder distributor: Points vs HEI
Quote:
Re: the mpg. I'm not sure about that one. I swapped the points dis. back before I realized I had a vacuum leak in the carb. Not sure if that was the cause. I'm going to run it for a week or so with the points dis. and then going back to the HEI for another trial run. |
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11-25-2008, 05:56 PM | #13 | |
Out of the carpool lane.
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Re: Six cylinder distributor: Points vs HEI
Quote:
Man, you're making this HEI thing way more difficult than it should be by putting it in and taking it out, then putting it in again!
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1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten... |
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11-25-2008, 06:11 PM | #14 |
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Re: Six cylinder distributor: Points vs HEI
Theres no way a hotter spark can hurt the driveability.
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11-25-2008, 10:29 PM | #15 | |
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Re: Six cylinder distributor: Points vs HEI
Quote:
As I mentioned, this is an almost stock 250 with single barrel. Not sure if that's the reason I don't notice a performance difference but, I'm going to run it with the points dis for a while and then go back to HEI. I'm mainly interested in the gas mileage gain or loss at this time. |
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11-25-2008, 08:14 PM | #16 |
Texas Big Wig
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Re: Six cylinder distributor: Points vs HEI
Dad & I put one in his old 250 & it made it a LOT better
It will idle, accelerate, & cruise better than with the points |
11-25-2008, 10:58 PM | #17 |
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Re: Six cylinder distributor: Points vs HEI
just chiming in to wish you luck on your hei swap,
and to tell you of my experience with this. i swapped to an hei and yes my milage dropped slightly, but that was due to my lack of experience in this conversion. after regaping the plugs, and adjusting the timing with a light. i actually picked up a couple of points on the mpg. but the throttle was crisper, and the truck gained some pep. i still wasn't getting the results on cold starts that i wanted, until i came across an old monojet with an electric choke. i rebuilt the carb, and took a while to get the choke set right, but what a difference, that made. to be honest, i hate the stock divorced choke stuff, almost as much as i hate points. this is the utimate "set it and forget it" combo in my humble opinion. again best of luck to you.
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11-26-2008, 12:28 AM | #18 |
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Re: Six cylinder distributor: Points vs HEI
Thanks for all the suggestions...
I want to run it for at least a full tank of gas, maybe two, before going back to the HEI. Then, I will try the different adjustments as suggested to see if I can see a difference and report back. |
12-26-2008, 07:18 PM | #19 |
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Re: Six cylinder distributor: Points vs HEI...UPDATE...
250 six cylinder HEI upgrade update.... I just got finished rebuilding the HEI Distributor and going to try it again.
I dismantled the HEI dis to see if there were any bad wires, etc. and I found the internal wires to be old and the connectors had a build up on them. I also saw that the windings on the pickup coil looked bad. I removed the drive gear and replaced the pickup coil, capacitor and regreased the housing and shaft (The rotor and cap I had replaced already). I polished and cleaned all the connections including the ground strap and put new heat sink grease on the module. Seems to be running real good and I do believe I can tell that there's a difference in the way it's running. I have the plugs gapped at .045 and the timing advanced to 8 degrees (might play with that one some). It's got a full tank and I'm going to see how it does with the mileage thing... |
12-26-2008, 07:48 PM | #20 |
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Re: Six cylinder distributor: Points vs HEI
Do it,doo it,dooo it.i swapped and like the results.
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12-26-2008, 07:59 PM | #21 |
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Re: Six cylinder distributor: Points vs HEI
I did one on my nova.. 250 monojet and the improvements are noticable to say the least. Im with others, one of the best things Ive done to older vehicles.
What wires did you put on it? There is a difference between the hei wires and the traditional breaker wires. Get wires off say a 78 truck with a six in it (anything with an hei)
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12-26-2008, 09:42 PM | #22 | |
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Re: Six cylinder distributor: Points vs HEI
Quote:
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12-26-2008, 09:46 PM | #23 |
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Re: Six cylinder distributor: Points vs HEI
Forgot to mention:
If anyone is interested here is a good site for a quick reference when converting. Has a good drawing and even lists part numbers if any requires them. http://rmcavoy.freeshell.org/HEI.html |
12-26-2008, 10:51 PM | #24 |
fugedaboutit
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Re: Six cylinder distributor: Points vs HEI
naw man plug wires
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12-26-2008, 11:27 PM | #25 |
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Re: Six cylinder distributor: Points vs HEI
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