Holley HP EFI conversion
#71
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#72
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can't go wrong w/ these coils,,they pack a punch and don't require more than 4.5msec of dwell.
The following 2 users liked this post by sutphen 30:
abones (12-06-2020), articfriends (12-13-2020)
#73
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can't go wrong w/ these coils,,they pack a punch and don't require more than 4.5msec of dwell.
https://www.amazon.com/ACDelco-Ignit.../dp/B00KCWUQ00
https://www.amazon.com/ACDelco-Ignit.../dp/B00KCWUQ00
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articfriends (12-13-2020)
#74
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They mention 558-307.
Also, I commented on your post in the "Classic Offshore" section "Post Your Oldschool Ride". I had no clue... You man, are a miracle worker.
can't go wrong w/ these coils,,they pack a punch and don't require more than 4.5msec of dwell.
https://www.amazon.com/ACDelco-Ignit.../dp/B00KCWUQ00
https://www.amazon.com/ACDelco-Ignit.../dp/B00KCWUQ00
Last edited by Rookie; 12-06-2020 at 09:29 AM.
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articfriends (12-13-2020)
#75
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![](https://cimg3.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190405_102149_46fb6c0d484e453302b5555f69cf82d6ab43bdce.jpg)
That`s my wiring parts list, you`ll need the 307, it plugs into the 312 ( I`m pretty sure I remember that right) There will be some changes to that harness, mostly you`ll be cutting out the 18 gauge wire and going with something in the 10 gauge. Then you`ll be tying some wires together and running one single ground to the head and another ground to the battery . (pins C and D) take care to look that over well... I remember the directions and colors were confusing .
#76
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307 harness
PIN C:
![](https://cimg1.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1149/20190620_092916_7b98d34463f238d4345b0e9e55fff88ec58d1eb3.jpg)
All the reds and browns go together to a single source :
![](https://cimg3.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190630_203220_ce3f21395be258310a76cd39c33e53281dc8cded.jpg)
I think this was the Pin B ground:
PIN C:
![](https://cimg1.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1149/20190620_092916_7b98d34463f238d4345b0e9e55fff88ec58d1eb3.jpg)
All the reds and browns go together to a single source :
![](https://cimg3.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190630_203220_ce3f21395be258310a76cd39c33e53281dc8cded.jpg)
I think this was the Pin B ground:
![](https://cimg4.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1149/20190620_093008_81847ed0a13d29faa0e9967a8f57d2122347783a.jpg)
Last edited by ICDEDPPL; 12-06-2020 at 12:56 PM.
#77
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You`ll also need a coil relay.
![](https://cimg3.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190619_222238_cc3f490d79a349a98d34aab098acf704a466d9cb.jpg)
I fused it using this one :
![](https://cimg9.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190624_224942_e8167d1369214913384d3469a33f93e5c25e5425.jpg)
![](https://cimg1.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190630_161131_4eb5dcfcd47ef89ffed0fc02d7022830540139c9.jpg)
I needed a few more spots for grounds and power this came in handy :
![](https://cimg1.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190623_193151_19eb1f85461942bcd693c5a3c62ec5419dc6488f.jpg)
![](https://cimg3.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190619_222238_cc3f490d79a349a98d34aab098acf704a466d9cb.jpg)
I fused it using this one :
![](https://cimg9.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190624_224942_e8167d1369214913384d3469a33f93e5c25e5425.jpg)
![](https://cimg1.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190630_161131_4eb5dcfcd47ef89ffed0fc02d7022830540139c9.jpg)
I needed a few more spots for grounds and power this came in handy :
![](https://cimg1.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190623_193151_19eb1f85461942bcd693c5a3c62ec5419dc6488f.jpg)
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Gimme Fuel (12-07-2020)
#78
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One more bit of advice is go to your print shop and have them blow up the instructions. Hang em somewhere.
You can thank me later after you see how tiny the included instructions are .
![](https://cimg2.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190612_180021_aaba638e07853742987c936cd1f5bd54034a348f.jpg)
![](https://cimg5.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/20201206_124849_resized_b71214852e8a36e265643d288a5439e839567987.jpg)
You can thank me later after you see how tiny the included instructions are .
![](https://cimg2.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x971/20190612_180021_aaba638e07853742987c936cd1f5bd54034a348f.jpg)
![](https://cimg5.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/20201206_124849_resized_b71214852e8a36e265643d288a5439e839567987.jpg)
#79
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Used those to prevent any interference , lots of electrical stuff in close proximity back of the engine.
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Rookie (12-06-2020), ThisIsLivin (12-08-2020)
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ICDEDPPL (12-06-2020)