can't make up my mind

[sams60gmc]

So last week i thought i wanted to bag my truck but a couple days ago i got a line on a 454 for my truck so i think i'm back on my pro street mission. so my question was what do i need to do to put a big block in my truck. what do i need to change around in terms of motor mounts etc.. thanks for the help guys! wish me luck on my find!

[BMSJaX]

Originally Posted by sams60gmc

So last week i thought i wanted to bag my truck but a couple days ago i got a line on a 454 for my truck so i think i'm back on my pro street mission. so my question was what do i need to do to put a big block in my truck. what do i need to change around in terms of motor mounts etc.. thanks for the help guys! wish me luck on my find!

Don't know for positive but I saw a company that sold BBC mounts and claimed only minor firewall modification was needed. But who knows what they mean by minor....

[steverino66]

I stuffed a 454 in my 66. I found a cheap set of aftermarket towers on craigslist, bought headers from Summit for 67-72 model. Small block towers won't clear the headers on the driver's side. Also, I moved the engine forward 2 inches to clear the firewall (3 holes on the frame rails, use the forward 2 - mine has short water pump, so make sure you still have fan/radiator clearance).
I've heard another option is to use 73-87 towers and headers with the slide-through bolt in the motor mounts.
There are a bunch of guys on here with nice big blocks. It's a lot of fun to rev it and rattle the windows in the garage. Good luck!

[Captainfab]

I would suggest using the '73-'87 motor mounts and headers for the same. If you want to run tall valve covers, you'll need to move the engine forward a couple of inches. It's really not difficult at all especially with an auto trans. If you wanted to run a manual trans, that would add a little difficulty to it.