What spark plug for LS-3 427
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,526
Likes: 104
From: Stafford Va
What spark plug for LS-3 427
Below is the engine I have in my custom 71 Pro Touring Vette. I have 600 miles on the engine/car to include break in so it is time to change plugs. It comes with Champion 9405 and I have seen the AC plugs 41-104 and 41-110 being discussed on the forum. Your thoughts? Thanks
https://blueprintengines.com/collect...crate-engine-2
https://blueprintengines.com/collect...crate-engine-2
Le Mans Master
Joined: Apr 2013
Posts: 5,376
Likes: 1,118
That’s a pretty damn cool custom rig. Should be lots of fun! I doubt that you’ll find a better running, longer lasting plug than the 41-104 AC Delco. I’ve run them with up to 12 psi of boost in my Vette and on 150hp shot of nitrous in my L92 truck, with no KR or other issues whatsover.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,526
Likes: 104
From: Stafford Va
I have Champion plugs in now and they have spent a lot of time at idle as the car was being built and I would like to change them out now with a better plug. Thanks for your input and here is the car. Kevin
https://www.corvetteforum.com/forums...o-touring.html
https://www.corvetteforum.com/forums...o-touring.html
