Pontiac firebird replacement engine?

Do the front springs and motor mounts need to be replaced when replacing a Pontiac 301 engine with a Pontiac 350 or 400 or 455 engine for a 1979 firebird espirit?

  • Answer:

    Yes, the 350,400,or 455 will out weigh the 301 by about 200lbs, so the front end will sag under the additional weight. Depending on the year of the motor you are swapping in you may be able to use the stock mounts. 1970-1979 Pontiac V8s had five bolt bosses per side and will bolt up to the 301 mounts. Pre '70 only had two bolts per side making a mount swap nessary.

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