350 to 454 swap

[johnathan]

So my dad traded some work for a 73 GMC motor-home 454/400. I 'm getting the 454 90,000 miles on it. If I swap it in place of the 350 would I have to change or move the motor mounts?

 

[sweetk30]

basic bolt in swap. and you can use 350 mounts but if you have the 454 stuff thay are a bit beefyer from pics i have seen, and GET EVERY ACC BRACKET AND OTHER LITTLE GOODYS. dont forget the exaust sytem will need work.

 

[draggbody]

the radiator and mounts should bolt in too... make sure the torque converter bolts line up... i found this out the hard way....

 

[johnathan]

Thanks! I'll swap in the beefier 454 mounts then.

 

[johnathan]

Time for some 700r4 carnageJust curious anyone know what a stock 454 woud be rated at?

 

[PsRumors]

Very easy job. I would run the ORD engine mounts for the 350, they are polly and very heavy built. They will bolt right up to your engine and frame. If you run a 454 mount you will have to do some drilling.

Like said before, be sure to get all brackets. The BBC brackets are getting harder to find and expensive.

I think a mid '80s 454 is 260 hp and 325 ftlbs of torque or the likes.

 

[sweetk30]

Time for some 700r4 carnage

and i was going to say not in front of a used and tired 700r4.

 

[johnathan]

Oh yeah while I'm in front of the internet,my dad will be getting my motor and swaaping out his TH350 for the 400. The 400 is longer ,correct?

 

[sweetk30]

yep . http://www.tciauto.com/Products/TechInfo/trans_dims.asp

 

[lectric80]

Yes as was said keep the mounts and brackets. Then watch how fast that gas guage drops when you step on the skinny pedal.