Big Block Chevy 366 Truck Engine

Casting number is 3999293 produced from 1968-85 366 tall truck

Complete less carb and starter

We know nothing about it

first $100 takes it.

From Hod Rod Forum:

The 366 has one overwhelming virtue,it is nearly indestructable.One setup for a for going fast and looking cool would be to swap a set of large oval oe even rectangular port open chamber heads on that shortblock to get the compression down to about 6.5:1,then add an 8-71 or Megablower to it with a mild blower cam and a pair of 750 carbs.If you spin the blower to make 12 psi of boost and use the right parts it will be a very strong running combo,and look like a killer too.Best of all since it is a short stroke bottom end with good internals{most 366's dont have a steel crank,but do have 4 bolt mains and truck rods} the engine will withstand about 6000 rpm which is more then enough to make scary power when you add 12 psi of boost to the mix.Dont get worried about how much blower you will need,the 366 isnt much bigger then a 350 smallblock,so you wont have to turn that blower too hard to make 12 psi,but if you tried that trick with a 350 smallblock with stock internals you would be picking your crankshaft out of the oil pan in pieces.

Would add a cam kit with about 235 degrees of duration at .050" on the intake and maybe 5 degrees more on the exhaust with a 114 seperatrion angle and 106 intake centerline. A good hydraulic flat tappet with about .510" lift and the correct springs{shim the intake springs to add about 15# over the reccommeded setting to compensate for the boost}.Use 2" primary tube headrs and don't be afraid of using a set of open chamber rectanglular port heads since the blower will make plantly of low end torque despite the way too large intake ports.

Another hot setup would be to kep the longblock as it sits,and freshen up the stock heads with a good valve job and new springs.Add a cam kit with about 220 degrees duration @.050" on both lobes and .500" lift and freshen up the rest of the valvetrain.Add a Torker intake with spacers,and a 750 carb and add a big shot nitrous plate to it with 300 hp jets.