94Z28LS1toLT1

Hey guys I'm gonna be changing my spark plugs,was just curious about the ngk tr55 ones,i currently have the stock ac delco ones,but was Wondering if the ngk ones are better?

Injuneer

Is the engine stock or modified? Power adders (forced induction, N2O) require different plugs than naturally aspirated engines. Significant power increase require colder plugs. Then there's the issue of conventional plugs vs. platinum or iridium.

94Z28LS1toLT1

hey Fred I'm sorry yes definitely modified,bigger cam,58 mm Bbk throttle body,long tube headers straight pipes no muffler n no cats,ported heads n intake manifold,1.6 rockers,all suspention done,moroso Cai,tb bypass.

Injuneer

Given the mods, you should be OK with the stock heat range. If you opt for platinum or iridium (my recommendation), electrode erosion due to heat and high miles is greatly reduced. With conventional non-precious metal plugs, you will need to replace more often, and inspect at least initially, to check for the gap opening up with the stock heat range.

I have used NGK plugs and had no problems. I think GM started using NGK for the LSx engines.... but not positive. I did have problems with the factory AC Delcos losing the platinum pucks, but that was 20 years ago.... hopefully they've improved since then.l

Should have no problems with the NGK TR55ix

94Z28LS1toLT1

Cool thank you sir

94Z28LS1toLT1

Hey guys I got 6 spark plugs done already,i didn't realize it was a p.I.t.a.on some of them. Ok the 3rd one on passenger side head is there a certain spark plug tool I need to get that one out because I can't get the ratchet into the socket. The ratchet I'm using is a duralast one

terminal_crazy

Try a ring/combination scanner to crack it loose.
Push a 6" piece of rubber hose onto the end of the plug.
Miles easier

All my cars have needed 2 or 3 ways to get all the plugs out.
Running mac mid length headers takes about 15-20 mins without rushing.

94Z28LS1toLT1

I'm already done,but I was talking about I couldn't get the ratchet on the spark plug socket and turn it to take it out. I just used a 3/4 wrench on the end of the 5/8 socket n it was alot easier. Thanks

Injuneer

I bought a "collapsing" spark plug socket 20+ years ago. Needs only 3/4" clearance between tip of plug and obstruction (e.g. manifold). Works with both 5/8" and 13/16" plugs. Useful for some of the LT1 plugs, stock manifolds or headers.

Midnight_Z

They still make that tool?

Injuneer

I can't remember where I bought it - maybe Griot's Garage, online.