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Old 08-20-2004, 11:41 AM
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strange noise

swapped a 327 from 72 vega in my datsun 240z. When the motor is started it makes what sounds like a diesel noise that last for 2-3 seconds. At first I thought the noise was maybe my makeshift exhaust hitting the tranny the noise did not go away after I had the exhaust done proper at the muffler shop.

The 327 never did this when it was in the vega and the only thing that is different is I went to a dual point accel instead of a HEi because of firewall clearance.

So im thinking maybe it timing prob..i have it set at 8 before with vacuum advance to ported. any ideas? no diesel on shutoff...
Any ideas, bob

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Old 08-20-2004, 12:42 PM
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Vacuum advance should be on a manifold source and the timing set at 12 degree`s before top dead center. I would have never went with a points type distributor of any kind, I would just gotten a stock points type and bought a electronic conversion kit, the best place for points is in the trash. check the harmonic balancer, see if it`s loose in anyway, sometimes the bolt comes loose or the old press on type becomes loose and wallows the key way out, and when you start it, it`ll make several loud bumps almost like a diesel since the balancer is freely moving back and forth due to the slop. check all the other clearances, make sure a motor mount isn`t broken or loose, have a friend start the car and keep a close eye on everything, including the starter, good luck.
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Old 09-29-2004, 04:36 PM
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I checked everything for clearance..everything is fine. It only does it for a couple seconds when it first starts and not every time so its difficult to pinpoint...
then i thought of an idea..i turned the idle way down till it almost stalled and bamm there the noise was..not as loud but i think its the same noise. I think its coming from the distributor.

Took cap and rotor off and discovered there is side to side play of the shaft of at least 1/8 inch..what causes this and is it repairable..

I want to buy a ready to run msd or Mallory but money is tight right now. Hei are cheaper but no close to the firewall and i don't want to bamm it in

Last edited by 72chevy240z; 09-29-2004 at 04:46 PM.
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Old 12-13-2014, 04:32 PM
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I purchased a MTD Distributor coil and every thing to replace my HEI. I ran the MTD for two weeks and went back to HEI don"t ask me why stupid I guess. But any way I will sell the whole unit for $100.00 complete and if you are not satisfied money back guarantee. Wiretwister
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Old 12-13-2014, 04:52 PM
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1/8" slop is terrible, I'm surprised the points will even open and close with that much slop. Seems like it would run like crap when revved, or be way down on power.

Is the shaft worn, just the upper bushing worn, or both?? What is bad there will decide if it is easily repairable.

Go buy a small cake pan, bread pan, mini pie pan or large muffin pan, etc...cut an opening in firewall, inset pan and nicely screw or rivet pan in and seal with seam sealer...presto, a firewall cove to fit your HEI into the car, and it will look professionally done for next to nothing in cost.
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Old 12-13-2014, 05:09 PM
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Just so you guys know......10 year old thread...I imagine he has it fixed by now.

I wont bother mentioning that a 72 Vega never came with a SBC engine, especially a 327 which ceased production in 69....but, I degress
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