Proper Gap?

[speeddevil]

I know there are some gm tech Gurus on here.

I currently own a 02 Tb 174, and some change. I plan on replacing my spark plugs i know it calls for Ac Delco for the plugs. Whats your thought on the Bosch Platinum 4+. Are they good/bad? I know its not going to give my Tb any performance.

What is the proper gap? Previous mechanic gapped my current plugs at 48. Some manuals i have read all have different numbers.

Thank You

[gmtech1]

Number that I come up with is .050". Platnum plugs are pre-gapped, be very careful when checking gap as you can damage the electrotes.

[maxwedge]

I'd stay with AC/Denso Iridiums here.

[j cAT]

Originally Posted by speeddevil

I know there are some gm tech Gurus on here.

I currently own a 02 Tb 174, and some change. I plan on replacing my spark plugs i know it calls for Ac Delco for the plugs. Whats your thought on the Bosch Platinum 4+. Are they good/bad? I know its not going to give my Tb any performance.

What is the proper gap? Previous mechanic gapped my current plugs at 48. Some manuals i have read all have different numbers.

Thank You

I used the bosch +2 plugs on my 5.3L and LT1 engines. the ac delco irridiums which are now in these engines work better. the combustion temps in the 5.3L 2000 engine are very high and the irridium plugs appear to handle it better than platinum. I noticed slightly better MPG and the idle cold was very smooth ..

In the past many had issues with the bosch plugs in these engines.

best not to mess with the gap , if it looks wrong the plug is defective get another..small wire will get damaged and fall off if you touch it.

the gap on the 5.3L engine changed. I believe its .060 now..check when selecting.

I believe it was .045 at first ..