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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Chevygold on August 31, 2025, 01:42:07 pm
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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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OK checked my plugs and they were short reach so just ordered a new set of long reach Bosch listed for 5.7 Corvette 89/90 LT5 which was all I could find so will have to do for now.
Busy running the plug thread cleaner down the plug holes now to get the carbon buid up cleaned out.
Graham
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Got 7 plug holes cleaned all the way down then rain stopped play, headers don't make for easy access to get anything into the threads on some cylinders!
Hopefully I'll get the new plugs tomorrow and can get them in then see how she runs with the right plugs, I imagine the recessed electrodes will have an affect on the dynamic ignition timing being buried 1/2" into the head?
Graham
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Completed cleaning the plug threads in the heads yesyerday, replacement plugs arrived but they weren't taper seats as shown in the description so have ordered different ones now which should be correct, Champion RS12YC, some of the plugs I found were $15 each with some even more so these will have to do for now, not a big fan of Champion but maybe they're better now?
Graham