I put in Bosch +4's at 30K and it was a BIG mistake. I then put in ACDelcos at 59K and changed them last year after the number 3 plug blew out of the head. I didn't put them in, another FUBAR job by my mech's assn after I bought new heads for the car
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33% ALEROMOD OWNER!!
2000 Olds Alero 3400 SFI 14.53 @ 94.93
1985 Olds Delta 88 307 SBO 17.96 @ 76.99
2007 Volvo V50 T5 6M 15.782 @ 89.12
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