67 rebuild motor wont start - Pontiac GTO Forum
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post #1 of 16 (permalink) Old 02-18-2013, 05:24 PM Thread Starter
 
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67 rebuild motor wont start

Hi guys, this is my first post so ...HELLO Everyone!

I have installed a rebuilt motor in my 67 GTO and I can not get the darn thing to start. Hoping to get some assistance here. I ordered it as a short block. 67 YS.

Specs are

400 .030 12 CC dished pistons
670 heads, roller rockers. 1.5
68 grind on cam.
RA exhaust
850 Quadrajet. mid 70's model
HEI converted Distributor was rebuilt and tuned in, all new internals.
New battery

I adjusted the rockers per instruction, basically TDC on #1 and did the adjustment and the rotated it to 6 TDC and did the other valves.

When #1 hit TDC I have about 130lbs compression,
Engine cranks and then back fires, carb floods which causes a small fire

I have spark, however I do have 1 question about this, will the stock plug wires work with HEI. I would think I would at least be able to get it to run.

I have verified the firing order several times, readjusted the valves a few times as well. I rotated the wires by 1 and still will not run.

Everything seems to be correct but I just dont know what else to check or do.

Any suggestions would be appreciated.
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post #2 of 16 (permalink) Old 02-18-2013, 05:33 PM
 
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1st check firing order, the poncho injuns distributor twists counter clock wise..... if it is wired up correctly you may be 180 degrees out of phase in the dizzy.... pull it and turn the rotor 1/2 turn....... at least you are getting fuel.....
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post #3 of 16 (permalink) Old 02-18-2013, 05:39 PM
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Make sure you wired the cap counter-clockwise. Also, are you using poly-lock nuts on your rockers? Please tell us a little more detail about your adjustment procedure.

Bear

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post #4 of 16 (permalink) Old 02-18-2013, 09:13 PM Thread Starter
 
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I should wire it like this 1-8-4-3-6-5-7-2. starting at 1 and go counter clockwise? #1 pointing at the front drivers side.

Yes poly clocks are locked down.

After troubleshooting a little more looks like I am only getting 9.5 volts at distro when cranking. Need to use another voltage source.
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post #5 of 16 (permalink) Old 02-18-2013, 09:31 PM
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9.5 volts is what you want at the distributor. Batt voltage will fry the points or module. Verify TDC at #1...very easy to get the dist in 180 out....BTDT many times. My bet is that your firing order is off. The timing chain could be off, as well. But doubtful. More likely the dist is in 180 out, or in off a tooth, or the firing order is horsed up.
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post #6 of 16 (permalink) Old 02-18-2013, 11:07 PM Thread Starter
 
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thanks guys, I will work on it again in the morning, thanks for all of the suggestions. I will double check my work once again....
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post #7 of 16 (permalink) Old 02-19-2013, 09:55 AM
 
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you can set your distributor 180 and try again or remove your plugs so you can easily rotate the engine with the cranksaft bolt with your finger over the #1 plug hole and when you got compression and your balancer TDC mark comes to the timing pointer stop and remove your distributer cap and see where your rotor is pointing. it should be on #1. with a HEI conversion you want 12 volts to the distributor always. a common points ignition system actually supplies 12 volts to the points when the key is in the start position. then when in the run position it goes though a steel resistor wire and that reduces that 12 feed to 9 volts or so. after you get it running you may have to remove the resistor wire and supply 12 to the HEI for maximum performance. good luck. the larger wires in the HEI cap are recomended.

Jim
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post #8 of 16 (permalink) Old 02-19-2013, 01:07 PM
 
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Quote:
Originally Posted by troy_barker View Post
HEI converted Distributor was rebuilt and tuned in, all new internals.
is this a small cap conversion or the stock GM HEI (large cap). check the wiring schematics for the brand. as stated the HEI needs 12 volts, theres a simple ignition conversion you can do with a headlight switch readily available at the auto partsthat will use the resistor wire as a trigger for the 12 volt lead to the batterywithout having to change any wiring through the fuse block. search "HEI conversion headlight switch" threads here it will come up. does sound like your 180 out from what you describe.

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post #9 of 16 (permalink) Old 02-19-2013, 02:44 PM Thread Starter
 
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ITS LIVE!!!!! AWESOME!

I swear I checked the wiring on the cap a few times......lol

Thanks GUYS after 5 years its ALIVE!
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post #10 of 16 (permalink) Old 02-19-2013, 03:35 PM
 
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congratulations..., lets see a vid of it thumpin.

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