Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

305 to 350

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Old 04-17-2013, 05:40 PM
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Default 305 to 350

I have a 89 fourmla with a 305 TBI I Have a good 350 block laying around im wondering if I can swap everything off the 305 block to the 350 and it work? and will I need the pcm for a 350 or what just give me some tips please ill be starting all this when I get my rebuild kit and a new cam and lifters if im missing something let me know plz
Old 05-16-2013, 08:21 AM
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Originally Posted by Tc Hampton
I have a 89 fourmla with a 305 TBI I Have a good 350 block laying around im wondering if I can swap everything off the 305 block to the 350 and it work? and will I need the pcm for a 350 or what just give me some tips please ill be starting all this when I get my rebuild kit and a new cam and lifters if im missing something let me know plz
When you say, 'everything' what exactly do you mean. Are you talking about accessories like Alt, power steering pump, water pump, etc.? Maybe that will help get some responses. If it was me, Id find someone with a 350 and try to match up brackets, etc. to ensure they are the same. I'm willing to bet its going to be diff.
Old 05-17-2013, 04:36 PM
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Originally Posted by Tc Hampton
I have a 89 fourmla with a 305 TBI I Have a good 350 block laying around im wondering if I can swap everything off the 305 block to the 350 and it work? and will I need the pcm for a 350 or what just give me some tips please ill be starting all this when I get my rebuild kit and a new cam and lifters if im missing something let me know plz
Everything you have accessory wise will bolt on the front of that motor.

That motor should be a roller motor so you are going to have to see if the 350 you have is roller too. Unless you want to go back to a flat tappet setup.

You will have to change the injectors and the knock sensor to do the swap



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