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« Last post by Chevygold on Today at 01:42:07 pm »
My '76 C10 came to me with a Vortec 383cu in crate engine which was a good incentive to purchase I thought, whilst idly browsing Summit racing site for Vortec information came across spark plugs and realised they were taper seat long reach and although I need to check tomorrow I'm pretty sure the plugs in the engine currently are short reach!
Anyway like I said I'll pull one in the morning if it ever stops raining and see whats in there.
Could explain why my truck is so thirsty!
Graham
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« Last post by JohnnyPopper on August 29, 2025, 11:00:51 pm »
Wow, You guys have the patience of Job. He waited for the turnaround that eventually came.
A true labor of love!
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« Last post by Chevygold on August 29, 2025, 11:39:36 am »
Hi Chris,
Set idle with vacuum gauge and AFR to get the best idle then moved to the primaries, I think the standard mains are 65 if I remember correctly and as running lean increased in stages to get a good reading through the rev range and settled on 75 which gave a good 13 over the range but as we all know the secondaries don't open until running under load, I have a pair of 82 mains to try in the secondaries but wonder if they might be too big?
Can't remember what size is in the secondaries just now as it's been a while since I was last having a go at the carb.
Not sure what colour spring is in the secondary vacuum pot.
Thanks
Graham
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« Last post by 1981lt1 on August 26, 2025, 08:18:50 pm »
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« Last post by bd on August 26, 2025, 11:43:50 am »
In order to help you, we need your help.
Remove the air cleaner and snap pictures of the engine from either side and front then snap a full-frame picture of the Vehicle Emission Control Information (VECI) label affixed to the radiator support or air cleaner housing. Post the pics. This will show us the emission control configuration and many of the electrical appliances powered through the ECM I (ECM Ignition) fuse.
GM routinely color codes ignition power feed (I+) wiring pink with black tracer (PNK/BLK). All of the wires protected by the ECM I fuse are color-coded PNK/BLK, designated on wiring diagrams as circuit 439 (CKT 439). However, not all PNK/BLK wires are protected by the ECM I fuse. Some PNK/BLK wires are protected by other fuses and carry different circuit numbers. In other words, all ECM I wires are PNK/BLK, but not all PNK/BLK wires are ECM I wires. This will become important as you troubleshoot.
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« Last post by Captkaos on August 26, 2025, 11:16:49 am »
Really going to be difficult to make suggestions, but most of the time the carbs are pretty close out of the box.
Really need to look at the plugs, compared to the AFR compared to drivability. Have you adjusted carbs prior?
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« Last post by Yellowcat on August 25, 2025, 11:14:50 pm »
It has smog air pump if that what you mean. I just got stranded on the road again today. As soon as I turn key on it blows ECM 1 fuse please help tell me which items are going to this fuse.
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« Last post by Scaryfastatx on August 25, 2025, 08:03:28 am »
Thanks guys, I appreciate it
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« Last post by Westex on August 24, 2025, 09:02:16 pm »
Thanks Guys! Now that I now what to look for the hunt is on. Wish me luck.
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« Last post by zieg85 on August 24, 2025, 06:36:39 pm »
Bench seat from a 84 Regular cab C/K will fit in a 74 Regular cab C/K. Same holes/location in the cab floor
I realize I am resurrecting an old thread, but does anyone know what year(s) bench seat will fit in my 87 GMC 1500?
Just be aware the if you get a 73-80 the 87 seat belts that normally go through the bottom cushion now has to go between the two cushions which making them shorter and harder to buckle if the seat is all the way back.
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