Went from 3.8 to 3.3 in January, along with a cam and tranny. Did alot at once.
0-3 months
3-6 months
6-9 months
9 months to a year
1 year to 1.5 years
1.5 years to 2 years
2 years to 2.5 years
2.5 years to 3 years
3 years to 3.5 years
3.5 years+
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Yeah I went from a rocker/pem/3.5" setup to a 3.2"/xp/ls1tb/headers setup...WIN!
Are you getting any KR with the 605's? If not then no you aren't hurting anything, in fact you want to run the hottest plug you can, a colder plug means nothing more than how well the plug is able to dissipate heat from the tip to avoid pre ignition, running a colder plug than necessary will only hurt the engines efficiency and lead to plug fouling.
the plugs suck for me but i got big clumsy hands and dont have headers
Bought my car in 2005 3.4 three months after. 3.25 put on in Feb. of 2010.
Yeah with headers its just a 3/8 ratchet, 3" extension and socket. Boom done. Don't need to move the engine at all.
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