Finally putting in my nitrous kit,going for 150 shot..Changing out spark plugs soon, quick question..Reading over the spark plug chart, didnt find what the gapping would be for a autolite 104, saw that the 103 were .035-.038 would the gapping be in the similiar ranges for the 104? also would i have a problem putting these into a 94 lt1? reason i ask i searched 104 fitting sizes and they didnt show fittings for the 1994 went to the 1995 and up.or if any of you have any suggestions as to what kinda sparkplugs or gapping please let me know.

 

The 104 cross refferences back to the NGk TR5 and is to hot a plug for nitrous use...you will want to run either the NGk TR6 or the Autolite 103...they will be gapped to .035-.038

 

any reason why you, or anyone would go Ngk tr6 over the autolites? or autolites over the ngk's? which would be the better plug?
thanks for any help.

 

personel prefference..I have always used the NGK's, and have had no reason to switch

 

i use ngk's in ls1's but in lt1's i 100% prefer an ac delco r42lts...... ngk's foul out alittle too fast in lt1's from my experiance..... the ac delcos are the way to go

 

The R42's what is the gap and is it one step colder or 2 then stock. Im intersted in them mainly because im running TR6 plugs now on nitrous.

 

on a 150 shot i would do like 34... and its 2 steps colder... i ran them on a 225 shot on a stock lt1......