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#1 |
Active Member
Join Date: Feb 2006
Location: sa tx
Posts: 851
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WOW installed the new HEI...what a difference!
I have been planning on installing an HEI conversion for months instead of running the current stock points and I finally did it. Its been 20+ years since I did one and it was just like riding a bike. This is a brand new HEI and it only cost me $50 bucks. I installed new plugs, wires and it started right up on the first try. Set the timing and its like night and day, what a difference. The Blazer was running ok but not perfect. I came back on Sunday from looking at Blue Thunder's Blazer and when I got home it started missing, the first thing I thought was darn points! Its kinda cool that the Blazer waited until I got home to start missing. Chevy's never let me down/stranded. To anyone contemplating installing HEI, do it now and see what a difference. After 20+ years I had forgotten how nice HEI is. Pics...
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1972 K5 Blazer ALL ORIGINAL paint & engine, A/C, Tilt, 4sp, AM/FM, Tow Hooks, Aux Battery Tray, Tach, Vacuum 2004 FORD FX4 SuperCrew 2005 CTS-V 12 sec family car ![]() 2008 Buick Enclave AWD, Nav, & DVD, Wife LOVES it! Last edited by 72Levi; 07-16-2008 at 10:58 PM. |
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#2 |
Future TOTM Winner
Join Date: Aug 2006
Location: Bulverde, TX
Posts: 2,692
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Re: WOW installed the new HEI...what a difference!
I have always been a big advocate of the HEI as well. There is basically NO reason to not make the swap unless you are just a purist and are going for 100% stock originality. Up until a month or so ago I had a junkyard pieced together HEI unit that finally gave out on me. I got this complete Mallory unit for about $145 and noticed the engine running smoother as well. Glad to see you made the swap!
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72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com |
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#3 |
Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
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Re: WOW installed the new HEI...what a difference!
As far as driveability, performance (even if your motor 100% bone stock, you'll feel a difference in perf!) and dependability. The cheapy $45-50 hei on ebay are too good to not use, a module is $25-30, cap and rotor $30, and a coil is $30-50. I bought two hei's so if one fails I'll replace it with the other since it'll be cheaper than the parts to fix the other one!!
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#4 |
Senior Member
![]() Join Date: May 2002
Location: Hammond, WI
Posts: 1,804
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Re: WOW installed the new HEI...what a difference!
Hey 72Levi, when you installed the new plugs, what gap did you use? 0.45" or 0.60"?
Having HEI makes one heck of a difference on these engines. I also think you'll get better gas mileage too.
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Mike 2001 Dakota R/T - Silver CC - 1 of 1671 •360 w/46RE •392 limited slip 1972 Chevy Suburban - Turquoise/Black 1969 Chevy C/10 - Blue LWB •350 w/ 700R4 •3.73 posi •PS PB A/C - SOLD ![]() Using your turn signal is not "giving information to the enemy" 67-72 FAQ Last edited by nightmare; 07-17-2008 at 11:38 AM. |
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#5 |
Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
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Re: WOW installed the new HEI...what a difference!
I've always used 45, but if I have an add on 6AL or similar, I stretch the gap out to between 50-60. It is one of those things that help to burn the A/F mixture more completely and up perf and economy.
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#6 |
Senior Member
![]() Join Date: May 2002
Location: Hammond, WI
Posts: 1,804
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Re: WOW installed the new HEI...what a difference!
reason I ask is because I recently checked mine because of really bad gas mileage, and they were set at 0.35", but when I asked at O'Reilly, they said that I should have them at 0.60" for a system with HEI. I just thought that 0.60" was too much, so I set them at 0.45" after talking to my dad about it. I haven't checked the gas mileage yet, but will this weekend.
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Mike 2001 Dakota R/T - Silver CC - 1 of 1671 •360 w/46RE •392 limited slip 1972 Chevy Suburban - Turquoise/Black 1969 Chevy C/10 - Blue LWB •350 w/ 700R4 •3.73 posi •PS PB A/C - SOLD ![]() Using your turn signal is not "giving information to the enemy" 67-72 FAQ |
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#7 |
Active Member
Join Date: Feb 2006
Location: sa tx
Posts: 851
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Re: WOW installed the new HEI...what a difference!
Yes 70 rs/ss I bought the Ebay one, not bad and it started right up. Nightmare I set them at .045 runs great.
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1972 K5 Blazer ALL ORIGINAL paint & engine, A/C, Tilt, 4sp, AM/FM, Tow Hooks, Aux Battery Tray, Tach, Vacuum 2004 FORD FX4 SuperCrew 2005 CTS-V 12 sec family car ![]() 2008 Buick Enclave AWD, Nav, & DVD, Wife LOVES it! |
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#8 |
Registered User
Join Date: May 2007
Location: San Antonio
Posts: 993
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Re: WOW installed the new HEI...what a difference!
Sweet dude. I was gonna call you today from work but we got really busy. I'm glad you got it running well again. Later. Mario.
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#9 |
Senior Member
![]() Join Date: May 2002
Location: Hammond, WI
Posts: 1,804
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Re: WOW installed the new HEI...what a difference!
Cool. I'm glad that it's running good.
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Mike 2001 Dakota R/T - Silver CC - 1 of 1671 •360 w/46RE •392 limited slip 1972 Chevy Suburban - Turquoise/Black 1969 Chevy C/10 - Blue LWB •350 w/ 700R4 •3.73 posi •PS PB A/C - SOLD ![]() Using your turn signal is not "giving information to the enemy" 67-72 FAQ |
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#10 |
Registered User
Join Date: Apr 2006
Location: East Sooke B.C. Canada
Posts: 543
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Re: WOW installed the new HEI...what a difference!
One thing that gets overlooked when doing this swap is the power wire. The original coil power wire is a resistor wire. When you do the swapp you have to make sure to run a new wire from the ignition switch to make sure the hei gets full battery power. It will work without doing this, but you won't get full advantage, or power out of the hei. It will also foul spark plugs more quickly.
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#11 |
I'm a poor spectator
Join Date: Aug 2006
Location: San Antonio, Tx
Posts: 2,287
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Re: WOW installed the new HEI...what a difference!
I had a MSD 6AL and the Pro Billet dizzy in mine initially and then the box went out and the dizzy won't run with out the box so I just did the HEI thing to it and it works great, I think it added 100 HP
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2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig ![]() 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! ![]() 1979 Ford F150 4x4 SWB Built Ford Tough!!! ![]() 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!! |
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#12 | |
I'm a poor spectator
Join Date: Aug 2006
Location: San Antonio, Tx
Posts: 2,287
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Re: WOW installed the new HEI...what a difference!
Quote:
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2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig ![]() 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! ![]() 1979 Ford F150 4x4 SWB Built Ford Tough!!! ![]() 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!! |
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