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Engine CID ID

Discussion in 'The Garage' started by BlaKK54Speed, Jan 1, 2007.

  1. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    how can i tell if i have a 350 or a 305? owner told me it was a 350 but im not so sure. vin says its a 305. looks awful original. where can i find an engine id tag or what can i see for differences???? any help is greatly appreciated.

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  2. dremu

    dremu Officious Thread Derailer Premium Member

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  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I found the numbers on the front...right behind the alternator there is a machined pad where the head and block meet. I wire brushed that part and looked up the numbers on Mortec.

    Rene
     
  4. CDA 455

    CDA 455 3/4 ton status

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    EXCELLENT RESOURSE INFO :bow: :bow: :bow: :bow: !!
     
  5. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    ill go look right now and see where they are.
     
  6. beater_k20

    beater_k20 Banned

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    the numbers on mortec are on the rear of the block, between the head and the bellhousing. should be on the drivers side of the engine.

    just judging by the exhaust manifolds, and the fact that the VIN says its a 305, it probably is.
     
  7. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    so yea.....cant get to the numbers on the block, i can feel them with my fingers and just barely start to see the last numbers but there is a wire loom right over them, plus oil and grease and there is a retainer about an inch away so i cant move the wire loom to even see them. man i am so mad right now. how hard can it really be to id the damn thing
     
  8. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    i want to say its a 305, it just looks too original not to be
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Prolly faster to pull the oilpan off...305 has a 3.75" bore versus the 350's 4" bore.

    Rene
     
  10. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    yea i guess that would give it away right away. i do need an oil pan gasket any way
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Perfect excuse. My VIN also said 305 when i ran it, and i had the same trouble you did getting the numbers. I pulled the pan because I was doing a rear main seal and found 4 bolt mains, check the bore and it was just proud of 4"...

    When i finally did get the numbers off the block it just comfirmed what i already knew, 4 bolt main 350.

    Rene
     
  12. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    wow that would be nice if i could do the same. doubt it will happen though. with my luck
     
  13. 3 on the tree

    3 on the tree 1/2 ton status

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    The one and only 305 I ever had, was external balance. The harmonic balancer had offset weiight cast into it. Real easy to see on the back of the balancer.:confused:
     
  14. beater_k20

    beater_k20 Banned

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    no 305 has ever been external balanced, they're all neutral balanced. save for the 87+ 1 pc RMS versions, which have a counterbalanced flywheel/flexplate (due to the lack of material to remove for balancing in the RMS area) , and a neutral balanced dampner.
     
    Last edited: Jan 2, 2007
  15. JpEater

    JpEater 1/2 ton status

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    X2 305's or 350's aren't externally balanced. Only the 400 had the "notched" balancer.
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    Do this. Surefire, as long as the block has never been decked. They are called "suffix codes". This can be accomplished (apparently) on all engines when installed, but it may be more difficult depending on equipment in the way.
     
  17. 3 on the tree

    3 on the tree 1/2 ton status

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    Well, I know the motor was a 305. I tried to use the balancer off my 70 350,so all the accessory pulleys would line up. It shook like a bastard! I pulled it all back apart, and compared balancers. The 350 unit was flat on the backside, and the 305 was channeled, except for one area that looked like a big square. The 305 came out of a 78 Impala, BTW. It was NOT fun changing over all the brackets and pulleys.:(
     
  18. beater_k20

    beater_k20 Banned

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    78 Impala... could've very well been a 400, since they were produced from '70-'80. that would have an externally balanced balancer and flywheel. :thinking:
     
  19. 3 on the tree

    3 on the tree 1/2 ton status

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    The reason I said I KNOW it was a 305, is cause I had to replace head gaskets 1 year after I installed it.:confused:
     
  20. BlaKK54Speed

    BlaKK54Speed 1/2 ton status

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    i already looked behind the alternator, there arent any plates or stampings anywhere on the head or block there. i looked hard too
     

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