Mighty Mouse or Killer Rat

[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

[rspears]

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.

[deckofficer]

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.

[pat mccarthy]

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

[offshore27]

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.

[HermosaRoberts]

Highway driving for distances, or short local hauls.