400 sbc in a ‘70 K10

[kwmech]

Originally Posted by GMC71k20

i highly recommend putting vortec heads and 6" rods on the 400, its an easy 500 ft/lb under 1800rpm with a rv cam

google the impersonator 406 magazine build

my thoughts regarding the original 400 blocks depend on your budget, machine shop connections and/or patience for engine swaps. the numerous anecdotes about cracked 400 blocks and heating issues that would could be avoidable if you pay for a dyno-test/warranty crate engine

i have an original block and vortec heads with 6" rods and the speedmaster intake. This makes the sm465, 4.10s and 35" tires very easy to drive.

What was your final compression ratio with the vortecs?