AC is what I plan on getting, unless there is a reason I should get something else like the split fire ones I read about in magazines? One last thing, what is the proper torque specs, I used to just hand tighten them on my old cars but I would like to continue to do things the right way with my Vette.:thumbsup3:

AC is what I plan on getting, unless there is a reason I should get something else like the split fire ones I read about in magazines? One last thing, what is the proper torque specs, I used to just hand tighten them on my old cars but I would like to continue to do things the right way with my Vette.:thumbsup3:

AC's are fine. NGK TR55's are another good choice. Torque specs are 11 ft/lbs. Pretty light torque.

AC's are what came in your car and they are as good as spark plugs get. There's no gain whatsoever by going to another brand.

AC's are what came in your car and they are as good as spark plugs get. There's no gain whatsoever by going to another brand.

that is what I have stuck by my entire life, I am not a big believer in these really expensive plugs, just my .02

really no need to go crazy on $ spent on plugs when the basic work just fine.

Hi There:
Your original factory plugs were denso ptj16r15(12563707) gapped to .060.The iridium ac delco 41-985 are excellant plugs.Gapped to .040 when you buy them, but check to be sure. If you don,t have a extra long set of needle nose pliars count on replacing the plug wires as they are hard to remove.Re-use the heat shields. Apply anti seize on plug threads. Use silicone grease on your wires especially where the wire plugs onto the s/plug. Next plug change will be easy. As some one said 11ft. lbs of torque.Number 7 cylinder is the worst to get at. Remove the 2 10 mm bolts from the block, that holds the AIR line on & swing that up & out of your way. eliminates the need for a double swivel socket.
robsc501

Hi There:
Your original factory plugs were denso ptj16r15(12563707) gapped to .060.The iridium ac delco 41-985 are excellant plugs.Gapped to .040 when you buy them, but check to be sure. If you don,t have a extra long set of needle nose pliars count on replacing the plug wires as they are hard to remove.Re-use the heat shields. Apply anti seize on plug threads. Use silicone grease on your wires especially where the wire plugs onto the s/plug. Next plug change will be easy. As some one said 11ft. lbs of torque.Number 7 cylinder is the worst to get at. Remove the 2 10 mm bolts from the block, that holds the AIR line on & swing that up & out of your way. eliminates the need for a double swivel socket.
robsc501

Invaluable info in this post!!!!! I learned the hard way.:soapbox:

I'm a new Corvette owner and started my first vette plug change tonight at 78K miles. After much inter-web research, I opted for the NGK TR55 plugs, partly due to cost. They are cheap at sparkplugs.com.

My experience was more challenging than I anticipated even though the plug wires came off relatively easily. Like others, I found the #7 plug to be the most difficult but not much more than the other 7 once I got the tubing out of my way. All 8 plugs were basically "seized" in the head. After the 3rd plug required a 12" crescent wrench as a cheater on the handle of my ratchet, I had some choice words for the chevy factory boys who did not bother to use anti-seize on steel spark plug threads in an aluminum head. It took me 1.5 hrs just to get the plugs out. :wtf:

So, tomorrow new NGK's go in torqued to 132 in-lbs (11ft-lbs)...if I can get my torque wrench in position. I have new 8mm spiro core Taylor wires going in too.




Hi There:
Your original factory plugs were denso ptj16r15(12563707) gapped to .060.The iridium ac delco 41-985 are excellant plugs.Gapped to .040 when you buy them, but check to be sure. If you don,t have a extra long set of needle nose pliars count on replacing the plug wires as they are hard to remove.Re-use the heat shields. Apply anti seize on plug threads. Use silicone grease on your wires especially where the wire plugs onto the s/plug. Next plug change will be easy. As some one said 11ft. lbs of torque.Number 7 cylinder is the worst to get at. Remove the 2 10 mm bolts from the block, that holds the AIR line on & swing that up & out of your way. eliminates the need for a double swivel socket.
robsc501

Corvette - cheap
Do these belong in the same sentence?

NGK TR55
You better hope the heat range is close to what the engine is designed for

All 8 plugs were basically "seized" in the head. After the 3rd plug required a 12" crescent wrench as a cheater on the handle of my ratchet, I had some choice words for the chevy factory boys who did not bother to use anti-seize on steel spark plug threads in an aluminum head. It took me 1.5 hrs just to get the plugs out. :wtf:
What was the engine temp when you did this?