nato4015

Hello,
What is the right part number for a Shorty Plug? I'm putting headers on my 1988 and need to figure out the "RIGHT" one to use. I swear to god I just pulled the plugs out and it wasn't even one of the ones that everyone on here has gone back and forth about. They were clearly the wrong ones whoever had the car before me,...As the Dead Kennedy's sang. "trust your mechanic".

Natilla

yellowvette1

I would try (accel 8199) shorty plugs...............

tapered seat, 14mm and .460 reach

nato4015

Now I'm really confused? My Factory Service Manual shows a plug with the Tapered Seat and Gasket not used. That would be the 8199 type. The car is 88 Aluminum Head. Had gasketed type long threads in it. Accel to AC showed the FR3CLS to a 0416S (s for short) which is long threads with gasket. Is the FSM wrong?

bwiencek

I got burnt by the parts store confusion on plugs for my '89 - went to grab plugs, they looked up the app and were low on stock on several of the brands that were on sale so the guy said the only thing they had 8 of that were on sale were autolite's so I took them home - go to install them a couple weeks later after the engine was assembled not thinking about it and they were the short tapered seat plugs which were used for an iron headed engine - got 3/4 of the way done when I noticed that something wasn't right - went back to the parts store and found out when they pull up an '89 corvette it lists all plugs for both the early (and non corvette) iron headed L98 and the aluminum headed L98 - and they have to look in the description to get the right ones!

Aluminum head you need the longer gasketed plug.