switching to hei? - Team Camaro Tech
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post #1 of 10 (permalink) Old Mar 17th, 06, 06:00 PM Thread Starter
 
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Question switching to hei?

I have a 1967 ss conv. 4spd. with a factory tach. I would like to switch to HEI. How does the factory tach. hook to the HEI? Are there any tips from other gearheads who have already made the switch?
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post #2 of 10 (permalink) Old Mar 17th, 06, 06:13 PM
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Re: switching to hei?

why switch to HEI?
there are so many aftermarket performance distributors out now.
and you can run into issues with the firewall with an HEI.
i say go with a unilite or MSD


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post #3 of 10 (permalink) Old Mar 17th, 06, 06:16 PM
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Re: switching to hei?

hook the tach wire, from memory its a blue wire to the tach...its one of the outside terminals...the HEI terminal box has markings to ID it
Also be aware ...
The wire from ignition to coil (or a section in it) is a ballest wire...resistance wire that drops the coil voltage from 12v to 6 volt. I can not rem if the hei is 12v or 6v..if 12v u will have to run a new wire.
Another member who has done the excerise less than 20 yrs ago, will be able to confirm or not, or do a forum search maybe quicker answer

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post #4 of 10 (permalink) Old Mar 17th, 06, 06:17 PM
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Re: switching to hei?

There is a tach connection on the hei, but, as dawg said, you may have clearance issues ... Also, you may need tach filter to make it read correctly ...
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post #5 of 10 (permalink) Old Mar 17th, 06, 06:22 PM
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Re: switching to hei?

Welcome to Team Camaro ace!

Lots of us have done this switch. One of the great things here at TC is that vast amount of info available using the search function. I say this because HEI swap/conversion gets discussed a lot.

Try searching "tach filter", and "HEI fit". The first will give you info on the simple tach filter required to keep the needle from acting weird with HEI. As far as connecting a factory tach lead to an HEI, it should just be a simple terminal swap (which may not be necessary, as you will read).

Fitting an OE style HEI (coil in cap) into a first gen is a hit and miss deal. The cap is large diameter, and certain motor mounts (307/327) may position the engine just far enough forward to squeeze it in without beating on the firewall. I had a GM HEI on the 68 and had to "adjust" the firewall to clear the cap.

If you don't want to deal with that, you can have your points distributor converted to HEI by someone like Dave Ray ( www.davessmallbodyheis.com ). That's what I have on my 69. Dave's setup allows you to run a separate coil just like the stock system, so the tach lead would connect to the coil the same as now.

There are also aftermarket small bodies, like the MSD Ready to Run and others.

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68 'vert driver RS clone -- gone!
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post #6 of 10 (permalink) Old Mar 17th, 06, 06:23 PM Thread Starter
 
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Re: switching to hei?

I have looked at several different types of distributers and talked to people localy. No one can tell me what to do with my factory tach. without spending $500 bucks.(on a budget)
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post #7 of 10 (permalink) Old Mar 17th, 06, 06:33 PM
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Re: switching to hei?

If you are on a budget, you can swap out your point for a Crane XRi for about $70. I have one in a 67 Chevelle SS 396 along with a flamethrower 1.5 ohm coil and the combo works great togther... tach works fine attached to the coil... Pertronix costs a little bit more and other manufacturers also offer conversion kits...
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post #8 of 10 (permalink) Old Mar 17th, 06, 08:22 PM
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Re: switching to hei?

Your factory tach will most [probably work or be able to be made to work with an electronic ignition. It ain't gonna be a problem, or not much of one.

If you can float $300 for a distributor, an MSD 8360 w/blaster2 coil is unbeatable. If you need cheaper, there are a number of conversions for the old points distributor, including mallory, crane, pertronix, and Dave's smallbody HEI.

If your tach is bouncy, then you need a filter. These are available from a number of sources, including GM and junkyards. I have plans on my website for one you can make out of $5 worth of parts from Radio Shack.





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post #9 of 10 (permalink) Old Apr 3rd, 06, 04:20 PM
 
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Re: switching to hei?

One thing you might want to consider if you go to a Malory or other aftermarket dist's is to keep your original dist with you. The reason I say this is.... on a trip from Florida to Philadelphia my Malory took a dump. I could not find a speed shop that had the part in stock. Not that I had the time or inclination to fix it on the side of the road. (Washington DC is not a good place to be stranded) I found an HEI at a repair shop for $50. I dropped it in and away I went.
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post #10 of 10 (permalink) Old Apr 4th, 06, 07:56 AM
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Re: switching to hei?

[QUOTE=If your tach is bouncy, then you need a filter. These are available from a number of sources, including GM and junkyards. I have plans on my website for one you can make out of $5 worth of parts from Radio Shack.[/QUOTE]

Unfortuantely, Radio Shack no longer carries electical components.
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