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any easy way to tell 350 from 305

This is a discussion on any easy way to tell 350 from 305 within the General Help forums, part of the LSx Technical Help Section category; i got a guy trying to sell me an engine saying its a 350 but my friend tells me that ...

  1. #1
    Bomb Technician Krazy351w's Avatar
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    hunter Green
    92 Camaro RS 350 Special

    any easy way to tell 350 from 305

    i got a guy trying to sell me an engine saying its a 350 but my friend tells me that its a 305 and a waist of money.

  2. #2
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    casting number on the back of the block behind the driver's head on the bellhousing mount pad. then, go to www.mortec.com and look it up.

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    Junior Member smallblockhero's Avatar
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    dark blue
    1998 Z28 A4

    by lookin at it?..um no not really. unless you know casting numbers. is it out of the car? GEN I's all are externaly the same dimensions and share parts so its hard if you dont know what to look for.

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    Bomb Technician Krazy351w's Avatar
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    hunter Green
    92 Camaro RS 350 Special

    its not in anything. the guy said it came from either the 80 model vette or mabey a truck and that its a 350tbi but my friend said its a 305 cuz the valve cover bolts go down the center.

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    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    Quote Originally Posted by Krazy351w View Post
    its not in anything. the guy said it came from either the 80 model vette or mabey a truck and that its a 350tbi but my friend said its a 305 cuz the valve cover bolts go down the center.
    they do on 350 motors as well. called centerbolt valve covers. started around 1985.

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    Bomb Technician Krazy351w's Avatar
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    hunter Green
    92 Camaro RS 350 Special

    thats what i thought because my 92 rs has a 350 in it and its like that and im almost positive its a 350 because it runs a 13.6 E.T. and all i have done to it is regear. i Know a 305 wont run that well.

  7. #7
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    Quote Originally Posted by Krazy351w View Post
    thats what i thought because my 92 rs has a 350 in it and its like that and im almost positive its a 350 because it runs a 13.6 E.T. and all i have done to it is regear. i Know a 305 wont run that well.

    well that wouldn't be a factory 350 in the RS as they only came with 305 TBI from the factory. someone swapped the motor out. a 305 can run that well. just takes some really good work.

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    Bomb Technician Krazy351w's Avatar
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    hunter Green
    92 Camaro RS 350 Special

    o i knew it wasnt a factory engine. liek i said im just really sure its a 350 due to how well it runs, considering its bone stock. any ways ill look up the casting numbers and hope its a 350. also i will be rebuilding my engine in the RS soon. what all should i have done to it to hop it up some. id like to get at least 350hp

  9. #9
    Rollo Tomassee AKIRA's Avatar
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    Quote Originally Posted by mrr23 View Post
    well that wouldn't be a factory 350 in the RS as they only came with 305 TBI from the factory. someone swapped the motor out. a 305 can run that well. just takes some really good work.
    I was going to say the exact same thing on both counts.

  10. #10
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    well, technically the RS could come with a 350 TPI. it was the B4C police package. rare car, if it is one.

  11. #11
    Bomb Technician Krazy351w's Avatar
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    hunter Green
    92 Camaro RS 350 Special

    no its not a tpi its tbi

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