Photobucket
Members Login
Post Info TOPIC: HEI Ignition


Veteran Member

Status: Offline
Posts: 40
Date:
HEI Ignition


Hello:

Has anyone installed a stock HEI with a  standard cap to a 66/67 Acadian with a small block?

Just wondering if the standard cap will fit without altering the firewall.

 

Thanks

 

Dave.



__________________


A Poncho Legend!

Status: Offline
Posts: 34751
Date:


 do not believe there will be enough room for an HEI large cap (coil and distributor in one) to fit. 

The external coil and small cap factory HEI was used on a many pick-up trucks and early Camaro's. Be carefully of the year of the donor vehicle; as an external cap HEI off of an OBD computer controlled car won't work (you can count the pins on the ignition module to determine if it will work. Four pins is what you want; five or more won't fly).

MSD, Accel as well as Mallory all make a small cap HEI unit that is better than the factory product because of improvements to the distributor body (using roller bearings instead of brass sleeves, and a billet body instead of a cast unit). The major difference is found in the ignition module itself. The aftermarket unit uses different components that shed heat faster than the stock unit can to maintain a steady spark above 4,500 RPM where a stock HEI drops off in spark energy (the stock factory coils refresh rate also enters into this, which is why the aftermarket sells coils matched to their ignition modules). 

Finally if you want it to look stock you can rework your old distributor by replacing the points with a self contained Petronix HEI ignition module and slip a reluctor ring over the distributor cam. There are people on the web who advertise this rebuild as a service (worth considering if your distributor needs to be rebuilt to compensate for years of wear).



__________________


Veteran Member

Status: Offline
Posts: 68
Date:

I installed a ZZ4 with the stock HEI in my 72 Nova. At the time I did some research and found that it was about 50/50 that the firewall might have to be altered to clear it. Mine fit with no problem but a tip from some was to replace the mounts on the front subframe, which might give back some space lost with aging originals. There were also the "make room with a big hammer" suggestions. I don't know how much difference in spec there is between the 66/67 and the 68/74. It might be worth a trial fit before altering anything.

As an aside, you will have to replace the factory resistance wire to the coil. The HEI requires the full 12 VDC for start and run.

__________________

66 Beaumont Sport Deluxe, 72 Nova SS, 2009 Solstice GXP Coupe (wife's toy)



Canadian Poncho Superstar!

Status: Offline
Posts: 15313
Date:

Mike Ward MB wrote:

There were also the "make room with a big hammer" suggestions.


 That's a popular suggestion by some.biggrin



__________________

Prince Edward Islandbug.gif

'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.



A Poncho Legend!

Status: Online
Posts: 33762
Date:

From talking to others, the 50% rule seems to be true for first and second generation Nova/Acadian as well.

__________________
1966 Strato Chief 2 door sedan 283 "survivor"


Uber Guru

Status: Offline
Posts: 3552
Date:

Could always go with 1 of these if stock won't fit, put 1 in my 57 and swear I gained 15 HP.

 

4748201.jpg



__________________


A Poncho Legend!

Status: Online
Posts: 33762
Date:

Gaining 15 horsepower wouldn't make me swear!!!

__________________
1966 Strato Chief 2 door sedan 283 "survivor"


Uber Guru

Status: Offline
Posts: 3552
Date:

Carl Stevenson wrote:

Gaining 15 horsepower wouldn't make me swear!!!


 You swear your telling the truth?smile



__________________


A Poncho Legend!

Status: Online
Posts: 33762
Date:

As a matter of fact, just this once, I actually AM!

__________________
1966 Strato Chief 2 door sedan 283 "survivor"


A Poncho Legend!

Status: Online
Posts: 33762
Date:

Whitey67 wrote:

Hello:

Has anyone installed a stock HEI with a  standard cap to a 66/67 Acadian with a small block?

Just wondering if the standard cap will fit without altering the firewall.

 

Thanks

 

Dave.





Are you talking about needing to modify it, or just "massage" it a bit to make it fit?

__________________
1966 Strato Chief 2 door sedan 283 "survivor"


Addicted!

Status: Offline
Posts: 170
Date:

I put an MSD with a box on my 70 Acadian. The firewall had been bashed for an HEI already. I found with just the MSD and the old box, that the engine fired up easier and quicker.

ray

__________________

1970 Acadian SS350 4speed

1967 Chev C10 

White Rock, BC



Veteran Member

Status: Offline
Posts: 40
Date:

Thanks All for your input.
Just have to give it a try.

Thanks

Dave.

__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.

Tweet this page Post to Digg Post to Del.icio.us
.
.
.
.