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04-04-2015, 12:02 AM | #26 |
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Join Date: Apr 2010
Location: So Cal
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Re: 292 engine upgrades questions
>> HEI Modules will burn out if not given their full 12 volts.<<
That is not, I repeat, not true. About 15 years ago I installed an HEI with coil-in-cap. When I added the AC, I changed it to the '75 inline six type with the externally mounted coil. I wanted the extra clearance so that the compressor could be a little lower. Both distributors for all these 15 years have been running with the original ballast resistor installed. Voltage measured at the Bat input to the coil is only a little more than 2.0 volts lower than actual battery voltage. 14.5 volts at the battery will provide an actual 12.0 volts at the distributor.
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'67 GMC 2500, 292, 4spd, AC Last edited by RichardJ; 04-04-2015 at 12:17 AM. |
04-04-2015, 01:03 AM | #27 | |
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Re: 292 engine upgrades questions
>> HEI Modules will burn out if not given their full 12 volts.<<
>> That is not, I repeat, not true.<< Quote:
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04-04-2015, 03:38 AM | #28 |
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Re: 292 engine upgrades questions
OK, what burns HEI Modules out then, high heat?
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
04-04-2015, 06:34 AM | #29 | |
Six in a row makes it go...
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Re: 292 engine upgrades questions
Quote:
I had a '70 Bel Air with original points. It would cut out completely at high rpm. After much diagnosis it was found that the resistor wire had degraded. It would provide 7v to the coil at lower rpm but spike to 12v at higher rpm. Maybe your resistor wire is degraded and feeding the HEI acceptably. I dunno. I solved my problem by putting in an HEI and running a dedicated 12v wire to the coil.
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67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce |
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04-04-2015, 06:37 AM | #30 |
Six in a row makes it go...
Join Date: Mar 2009
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Re: 292 engine upgrades questions
I had a SBC that went through modules all the time. Tried all different brands. I always theorized it was heat related (only happened in summer, would kill the motor but restart after cooling) but didn't know for sure. New module would fix it for a while. It wasn't fuel related.
I've never had a module problem on an inline HEI.
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67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce |
04-04-2015, 07:36 AM | #31 |
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Re: 292 engine upgrades questions
I believe it is heat. there is a dialectric paste, or grease you put between the module and the distributor that creates a heat sink for the module. when the grease breaks down or dries up you loose the heat sink and it over heats and fails.
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
04-04-2015, 07:55 AM | #32 |
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Re: 292 engine upgrades questions
In my eyes, mistaken use of Dielectric grease for thermal transfer has caused overheating of many a coil. Most coils will come with a pack of thermal paste which is not the same thing. I go one step further and use premium thermal paste made for computer processor heat sinks.
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04-04-2015, 01:33 PM | #33 | |
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Re: 292 engine upgrades questions
Quote:
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
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04-04-2015, 05:47 PM | #34 | |
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Re: 292 engine upgrades questions
Quote:
Arctic Silver or Arctic Silver5 is what I use. On my computer processors AND my HEI modules. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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04-04-2015, 07:03 PM | #35 | |
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Re: 292 engine upgrades questions
Quote:
I killed one HEI Delco distributor by greasing the works, counterweights and under module with White Lithium grease. The lithium hardened and jammed the counterweights. I never thought about overheating the module, too.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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04-04-2015, 09:12 PM | #36 | |
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Re: 292 engine upgrades questions
Quote:
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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04-04-2015, 11:33 PM | #37 |
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Re: 292 engine upgrades questions
Here is the thread I used when I installed my HEI. I bought mine from Langdons. http://www.langdonsstovebolt.com
http://67-72chevytrucks.com/vboard/s...d.php?t=148346 Lots of great threads out there to read on tune ups and anything else you need to do. The thread search is your friend. A Haynes repair manual is a great resource as well.
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Dane 67 Chevy Fleet 250/4 speed 1/2 ton 68 Chevy 250/4 speed 1/2 ton for parts 49 GMC Grain truck 235 1 1/2 ton 76 Chevy 350/4 speed 1/2 ton |
04-05-2015, 10:19 AM | #38 |
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Join Date: Mar 2003
Location: Maine
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Re: 292 engine upgrades questions
Esahic, all of the info you've been getting is good, straight stuff from guys who know what they're talking about, but before you go changing up a lot of parts, re-read SS Tim's post #3. You need to know what condition your engine is in before you make any substantial changes. You need a baseline to start with to know what needs to be done first. Do a compression test and write down the numbers. (This is your cylinder and ring condition) Check your oil pressure with a known good gauge. (A general condition of bearings, although not all-inclusive.) Do a leak-down test. (Ring and valve condition.)
If these tests come out within the specs you're good to go with the modifications, but if your foundation isn't sound you'd be much farther ahead putting your $$ into bringing the basic engine up to the best condition possible. These are tough engines, and last a long time, so your chances of having a good one are on your side, but you need the baseline now so you can document which modifications over time- (HEI, headers, 4bbl, etc. etc.) made the biggest difference in performance. You're in a pretty exclusive club! Sixes are cool!
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'68 Short C20 Flatbed Dually w/ 292 4bbl, Langdon cast headers, and WC T5 trans. '81 G10 Shorty Van "Good judgement comes from experience, and a lot of that comes from bad judgement." Will Rogers "Under promise, then over achieve." |
04-05-2015, 12:35 PM | #39 |
Six in a row makes it go...
Join Date: Mar 2009
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Re: 292 engine upgrades questions
The post above is good advice. No sense spending time on a engine that's too far gone...
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67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce |
04-13-2015, 10:27 AM | #40 |
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Re: 292 engine upgrades questions
Thats some great advice SLOMOTION. I was ready to order new parts, but now I am going to check the oil pressure, compression and leak down test, before I spend money on it.
Now I need to start doing some research on how to do all these test. Can't wait, should be fun. |
04-13-2015, 12:51 PM | #41 |
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Re: 292 engine upgrades questions
I've been following this thread for some time
I put a petronix ignition kit in my Delco Remy distributor, in my 270. I'm not 100% sure I notice any difference other than it being more reliable I can't ever get my truck to run right, I have a Rochester B 1 barrel and its always given me problems and I am going to go with the original Zenith for my engine soon
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1971 GMC Sierra 1959 GMC 100 |
04-13-2015, 01:18 PM | #42 | |
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Re: 292 engine upgrades questions
Quote:
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1967 C10, LWB, 250, Powerglide, PS, PB, 3/4 STATIC DROP |
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04-13-2015, 01:26 PM | #43 |
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Re: 292 engine upgrades questions
The Rochester leaks though even after a rebuild. I've even tightened down the bolts, The Rochester B's are made for 235's, and its currently on my 270 GMC engine, which should be a Zenith and I am certain to buy one soon
My timing is off still, it would run without the choke but suddenly just cut out. So I just keep the choke out. I just recently replaced the vacuum advance as well, it was the original one
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1971 GMC Sierra 1959 GMC 100 |
04-13-2015, 05:45 PM | #44 |
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Re: 292 engine upgrades questions
Thank you Esahic. A couple of searches on "youtube" should net you a few good tutorials on anything you want to know. I wouldn't take all of the info in one video to be the gospel though, watch three or four from different techs on the same subject then you'll have a good understanding of how to go about these different tests. Check with your local parts store for the equipment too. Several of them will loan you the gauges and test equipment (with a deposit,) in hopes that you'll purchase whatever you need from them.
Quite a while ago I was given An HEI distributor for my 292 and I thanked the man telling him I'd install it when I had to do some major rework on my stock distributor. That was two or three years ago and I haven't had to do anything to my points/condenser dist. yet. As for the big 1 bbl carbs, they do what they can, but they're not the ideal configuration. The trouble is the engineers tried to come up with a compromise carb that would do everything from idle to highway RPM with a single unit. A good compromise is a small 4 bbl carb for all-round driving because with the secondary's closed you still have good vacuum through the smaller primary's for low RPM/town driving, but also have the secondary's for highway and higher RPM driving. The 4bbl is a better mileage getting carb, but what you pay for the 4 bbl and associated manifold kind of nullifies any gain in the pocket book from better mileage.
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'68 Short C20 Flatbed Dually w/ 292 4bbl, Langdon cast headers, and WC T5 trans. '81 G10 Shorty Van "Good judgement comes from experience, and a lot of that comes from bad judgement." Will Rogers "Under promise, then over achieve." |
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