Thread: Mighty Mouse or Killer Rat

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I've recently bought a 1970 chev stepside Pickup and I want to upgrade the drive train it's got the stock 307 I'm torn between a 383 stroked and a 427 big block any input

Originally Posted by 1970chevstepper

I've recently bought a 1970 chev stepside Pickup and I want to upgrade the drive train it's got the stock 307 I'm torn between a 383 stroked and a 427 big block any input

Hard to say. There are advantages to both, but you need to define your intended use for the truck. Are you building a truck to use & drive, or a truck to trailer and show? Highway driving for distances, or short local hauls? Welcome to CHR, by the way.

My 383 stroked sbc would have been perfect for your truck. Only produced 320 hp @ 4050 rpm but knocked out 516 lb/ft @ 2800. My current engine is a Dart block 427 sbc and for a heavy truck would not be too good. However a big block 427 would have more than enough torque at low rpm to get the weight of the truck going good AND would also have the high rpm zing factor.

Originally Posted by 1970chevstepper

I've recently bought a 1970 chev stepside Pickup and I want to upgrade the drive train it's got the stock 307 I'm torn between a 383 stroked and a 427 big block any input

yep take the 3.756 crank out put a 4.250 or 4.375 in the427 block and get a 489to 510 .if a tall deck 10.200 deck bock throw a 4.500 crank in the block and get a 526to 541 and use a sbc for a starter

doing many of them rats right now... i know thats easy one for me

Big Block is way to go.I am putting a 454 in my car.
Nothing has the WOW Factor more than Big Blocks and torque is fantastic.

Highway driving for distances, or short local hauls.