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Thread: 454 build - what intake and cam ?
          
   
   

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  1. #91
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  2. #92
    ceejay is offline CHR Member Visit my Photo Gallery
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    I want to go for a used Delco Remy HEI distributor rather than an after market one. That way reliability will be at it's best and parts will always be available to replace.

  3. #93
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    Quote Originally Posted by ceejay View Post
    Thank you.. the aftermarket distributor I have is definitely too lose in the block. Without the clamp holding it down, it can shake side to side quite a lot in the block where my old points Delco does not.

    Back to my original question....

    will a Delco HEI out of a 1977 Chevy Corvette / Camaro 350 fit correctly into my Mark IV 454 block ? are the length and diameter and the oil slot near the drive gear in the correct location ?

    I will have to find a melonized gear for it as I'm running a Crane hydraulic roller cam
    As I pointed out in Post #84, the GM HEI fits every V8 from '55 through 2000, small blocks, big blocks, all displacements. Chevy used the same shaft dimensions, oil pump interface, and drive gear for everything, so I believe the answer is "YES".

    You say "...the aftermarket distributor I have is definitely too loose in the block" but then you ask will a "...Delco HEI out of a 1977 Chevy Corvette / Camaro 350 fit correctly into my Mark IV 454 block." Is your HEI distributor a used GM HEI unit or aftermarket? Define "Too Loose". Have you measured the distributor base on the old point style compared to the HEI compared to the hole in the intake with a pair of calipers? How sloppy is it? Regardless, the "play" you mention sounds like it's the distributor housing base to the intake manifold, not the distributor shaft so it won't affect your timing once locked down. That said, if it worries you at all why not invest $100 in a new HEI unit from JEGS, Summit, or another reputable supplier? Just avoid the Amazon Specials and buy from a good seller. A '77 unit is almost 50 years old!!!

    Earlier you questioned the reliability of the HEI units. Back in the early days of electronic ignition the modules in all of the systems were the weak link, and seemed to fail for no reason, but it was usually excessive heat. They've improved through the years, and while a module can still fail the "mean time between failures" is drastically improved. I'm running a GM HEI on the '32 roadster, provided by GM Performance in the ZZ4 package, and I don't bother carrying a spare module. I can get one at any big box (or hole in the wall) auto parts store if it ever does happen to fail. It's just not a worry point to me.

    Good luck! It's great that you've got the engine installed, and that you're working towards getting it moving down the road!!
    Last edited by rspears; 01-19-2024 at 10:52 AM.
    glennsexton likes this.
    Roger
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  4. #94
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    I absolutely concur with everything said by Roger in post #93. The stock HEI from GM is hard to beat for up to 8,000 RPM and many of them are still in service after nearly 50 years. A genuine GM replacement would be fine (probably $450). If you opt for aftermarket, DUI is my first choice ($275- $300) followed by MSD ($250). Don't know what it will take to ship to Sri Lanka so if you can find in country, go with any of these three.

    Any of these should be a direct drop-in replacement and should a tight fit to the manifold. There will be some movement in the shaft to accommodate advance. Set initial timing at 12 degrees (with all vacuum off and plugged at manifold) and then drive it like you stole it.

    Best of Luck,
    Glenn
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  5. #95
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    Maybe to early in the morning for me to be answering / asking questions but.. isn't there a big seal ( o-ring ) on a GM dizzy? Does yours have it in place?

  6. #96
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    Quote Originally Posted by 34_40 View Post
    Maybe to early in the morning for me to be answering / asking questions but.. isn't there a big seal ( o-ring ) on a GM dizzy? Does yours have it in place?
    No, none on any I've worked on.
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  7. #97
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    Quote Originally Posted by 34_40 View Post
    Maybe to early in the morning for me to be answering / asking questions but.. isn't there a big seal ( o-ring ) on a GM dizzy? Does yours have it in place?
    I don't want to pull the distributor on the ZZ4 to check, but Summit shows one....https://www.summitracing.com/search?...shaft%20o-ring

    Thanks to Glenn for pointing out that ceejay is asking from Sri Lanka! I hadn't picked up his location!
    34_40 likes this.
    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

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