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12-23-2009, 10:00 PM
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#1 |
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Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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points to hei swap
Gotta 74 GMC C25 with a 454 and points want to swap to hei. Need some help on what to do with the wiring part of it.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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12-23-2009, 11:11 PM
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#2 |
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Next project: 1970 K10
Join Date: Feb 2004
Location: Fort Collins, Colo 80524
Posts: 6,684
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Re: points to hei swap
Easy.
Find a fused IGNITION ON circuit on the fuse block, or an unfused circuit (and add an inline fuse), and run a wire from there to the IGN terminal on the HEI. Done. Just be sure to cap off the old wire(s) that went to the coil.
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Bob 1970 Chevy K10 LWB "Goldie" 350/TH350 next project!! 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE |
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12-24-2009, 04:03 AM
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#3 |
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Account Suspended
Join Date: Jan 2009
Location: galt ca,
Posts: 749
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Re: points to hei swap
either that or pull the old wire out of the wire bundle and the plug and replace it with a new 12g wire.
you can get the terminals from a good parts place and they come out of the plug with just a pair of pliers. |
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12-24-2009, 10:05 AM
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#4 |
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Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: points to hei swap
You need to run a new full voltage power wire to the BATT terminal on the HEI that is ignition on power. The old points system has a resistance wire in it and has less than full voltage getting through it. The HEI needs as much voltage as you can give it. The more it has the better it works.
I have run a relay with the points trigger wire and given the HEI full battery voltage this way.
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miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
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12-24-2009, 10:30 AM
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#5 |
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Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: points to hei swap
the cheapest (yet dependable) HEI is from skip white on Ebay. Most of them are $45 which is half price or better than most.
you also need new wires and open your plugs to .45 (so people say)
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The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" |
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12-24-2009, 12:23 PM
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#6 | |
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Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: points to hei swap
Quote:
I'd like to see some BSFC and power numbers from a dyno test with different plug gaps to know what the benefit really is.
__________________
miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
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12-24-2009, 12:47 PM
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#7 |
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Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Re: points to hei swap
Yeah for some reason factory gap spec for HEI in 75 in most cases is .60 thousandths.
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