400sb HP??

[Evangelion]

I need to know the stock hp of a 400sb, came out of a 73 caprice has a 4 barrel stock carb and from what i've read the stock compression is 8.5:1 and that hasn't been changed yet. Just completely guessing a ball-park figure of maybe 200-250ish?

[slacker_53]

I think your right in there, if memory serves....240hp.

But, my memory isn't what it used to be.

-slacker

[a1supersport]

Yeah about there. What did you plan on doing with it? Are the last four numbers on the block ID "1911"? That'll make it a 4-bolt main...not that it would be any better than a 2-bolt main. Even though the HP numbers were low, the torque level was good...and torque is usable power.

[Evangelion]

Well...im planning on; installing forged 12.1:1 pistons, rebalancing the crank. rebuilding the heads port polish 3angle valve job, pin the rocker studs if they aren't already, upgrading intake,carb, and matching cam. I already have some cheap Mr. Gasket headers that my friend gave me for free ... get an actuall flywheel assembly throw a 5spd manual tranny on it and drop it in a 67-72 chevelle...pump a 150shot of NOS at the tracks.... thats the plan...

[leew347]

That sounds like its gonna be pretty good.
O wait did i say pretty good i meant awsome

[a1supersport]

Woohoo!! Reminds me of my younger days . A few years back I built up a 406 (400, bored out .030), 10.25-to-1 compression, solid cam, roller rockers, camelback 1.94's, Edelbrock Performer RPM, Holley 750 double pumper, Mallory Electronic distributor, MSD-6A box, and fenderwell headers. Backed it up with a steel flywheel and a Muncie M21, and dumped it in my 67 Nova with a 4.11 rearend and M/T 28x10.5-15 slicks. Those tires would not stick because of the 400's torque, and the "shock" of the clutch being engaged. This engine you're building may get a little costly because if you're going to use a 150-shot of nitrous, that stock crank and rods won't take that abuse for long. Aftermarket cranks and rods for this engine aren't cheap. Plus you'll have to find a suitable flywheel that'll work with this engine (the 400 is externally balanced, like a big block), as well as work with the 5-speed you plan on using. Very challenging to say the least. But it can be done. Good Luck

[slacker_53]

Good luck with it.........should be kick ass.

-slacker

[h3llphyre]

Originally Posted by Evangelion

Well...im planning on; installing forged 12.1:1 pistons, rebalancing the crank. rebuilding the heads port polish 3angle valve job, pin the rocker studs if they aren't already, upgrading intake,carb, and matching cam. I already have some cheap Mr. Gasket headers that my friend gave me for free ... get an actuall flywheel assembly throw a 5spd manual tranny on it and drop it in a 67-72 chevelle...pump a 150shot of NOS at the tracks.... thats the plan...

What type of gas do you plan on running with a 12.1:1 CR? Not anything that can found at a normal gas station.

Do yourself a favor, and get a good set of aftermarket heads. They can be had for cheap. maybe even just buy the edlebrock performer RPM kit.