Proper Placement of piston rods in 2003 pontiac grand am

Asked by Feb 18, 2014 at 05:52 PM about the 2003 Pontiac Grand Am SE

Question type: Maintenance & Repair

When removing the pistons from a gunked up 3.4 L i didn't see that three were marked with the stamp A574 and three marked with B574. Does this mean they belong on one side or the other and which side if so?

1 Answer


Manufacturers have tolerances they want to maintain between the piston wrist pin and rod. They mark these "A,B,C" etc. If you're not changing rods, it's not really an issue. However... (and this is just from experience) ....if you didn't mark them when you took them out, I would not re-use them. It has nothing to do with the pistons. The rod journals 'mated' to the crank over the years and mis-matching them to a new journal can cause vibration and can shorten the bearing life, maybe by a lot. Do people do it anyhow? Sure. For the labor to put it all back together, and maybe do the whole thing again, I would replace the rods and pistons the first tim

Your Answer

Pontiac Grand Am Experts

  • #1
  • #2
    John Saffrahn
  • #3
    Tom Demyan
View All

Related Models For Sale

Used Pontiac Grand Prix
1,920 listings starting at $3,000
Used Pontiac Firebird
6 Great Deals out of 658 listings starting at $4,999
Used Ford Mustang
317 Great Deals out of 38,894 listings starting at $1,995
Used Chevrolet Malibu
664 Great Deals out of 48,938 listings starting at $1,500
Used Chevrolet Camaro
267 Great Deals out of 30,511 listings starting at $4,200
Used Chevrolet Impala
379 Great Deals out of 27,771 listings starting at $1,499
Used Pontiac GTO
380 listings starting at $3,950
Used Chevrolet Corvette
103 Great Deals out of 15,839 listings starting at $4,500
Used Honda Accord
592 Great Deals out of 92,752 listings starting at $1,495
Used Pontiac Bonneville
340 listings starting at $2,000
Used Nissan Altima
820 Great Deals out of 68,383 listings starting at $750
Used Honda Civic
398 Great Deals out of 52,416 listings starting at $1,200

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.