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mechanicalman · 09-17-2014, 02:44 AM

Hi, Longbedstepper-

What did you use for a power supply wire on the new HEI?

HEI takes more juice. If you used the old points coil power supply from the ignition switch, it's not enough. Use that wire instead for a relay trigger, get a 30 amp relay and run power straight from the battery or junction block or even the starter and use a heavier gauge wire to the HEI.

This might fix your problem. If not,

NOTHING wrong with the Edelbrock carb, it works very similar to the quadrajet. MSD distributors are the BEST. If you got their "good one", then you can put the parts in they come with and custom tailor your advance curve to suit your engine. If it's 100% stock it's probably around 9:1 compression so set your timing at 36 total and that needs to come in before 3,000 RPM. If it cranks slow, cut it back a couple degrees. It would be interesting to know what part number MSD distributor you have and where your base timing ends up after you set the total.

09-17-2014, 02:44 AM	#8
mechanicalman Registered User Join Date: Jun 2014 Location: Glendale, Arizna Posts: 1,642	Re: 69 chevy feeling tired! Hi, Longbedstepper- What did you use for a power supply wire on the new HEI? HEI takes more juice. If you used the old points coil power supply from the ignition switch, it's not enough. Use that wire instead for a relay trigger, get a 30 amp relay and run power straight from the battery or junction block or even the starter and use a heavier gauge wire to the HEI. This might fix your problem. If not, NOTHING wrong with the Edelbrock carb, it works very similar to the quadrajet. MSD distributors are the BEST. If you got their "good one", then you can put the parts in they come with and custom tailor your advance curve to suit your engine. If it's 100% stock it's probably around 9:1 compression so set your timing at 36 total and that needs to come in before 3,000 RPM. If it cranks slow, cut it back a couple degrees. It would be interesting to know what part number MSD distributor you have and where your base timing ends up after you set the total.