[Coupethis]

Hey guys,

First time poster sayin howdy from Aus. Im currently building up a 400ci chevy for my 1971 Holden Monaro and am curious to see if its going to produce the goods. Parts specs have not been completely finalised but we've agreed on the following:

Studded 2 bolt block, prepped standard 400 crank, Scat 6" H Beams, approx. 10ish:1 compression pistons, 220cc Pro Action (ProTopline) Iron Lightning heads that should flow around 600hp, custom solid grind cam approx. 260 @ 50 with about 570 thou lift, Victor Jnr manifold, modified 750 double pumper, MSD 6AL ignition, 1 3/4" extractors, twin 3" system.

Im guessing this combo should put out around 500hp @ 6000rpm at the crank. If anyones got some experiences with similar combos like this I would greatly appreciate hearing them.

Cheers

[Garbonzo Bojangles]

My 406 makes about 500 at 6000 and it's not as extreme as yours. I would guess your's is pushing 600 HP. I don't have DD, though, and sometimes you just can't look at specs and spit out a number. Nobody would ever think my engine would make the power that it does.

If you're planning on using that power more than a little bit you have to make sure your chassis and drivetrain can handle it.

[87442lover]

411 HP @ 6000RPM
387 ft. lbs @ 5000RPM

Thats assuming 2" x 1.625" valves ( ihad the profile for those heads, but not valve size)
Normal headers with mufflers
Cam of both 260 duration and .570 lift at 112 deg.
and assuming std bore size.

[deuce_454]

my numbers are in the woods. i need the flownumbers at various lifts for both intake and exhaust for the heads, and the specs for the cam IVO/IVC and EVO/EVC and lift, what parameters are set, and what are not set yet... ??

do you have the carb??
have you bought the cam??
what size are the headders??

would you like suggestions on the stuff you havent bought yet
if so, are you aiming for torque in a certain range, are you planning nitrous??

[killerformula]

I wouldn't push that block any harder man...

You'll get your 500 horse, but you'll have to put some R's on that motor, something 400's aren't awefully good at.

Just some stuff to watch for, it sounds like a mean motor, you'll have tons of fun with it.

Enjoy-

K

[Coupethis]

Cheers guys,

The valves will most likely be 2.02/1.60, the cam LSA will be 110 deg, headers are 1 3/4" into 3" with a high flowing twin 3" system, 30 thou over bore size.

"some R's on that motor" not sure if i follow killerformula? Yeah there will be no plans for BIG HP (e.g. nitrous) on this engine as it will be making more than enough power for what I can handle.

Heres a bit of info on the pro topline 220 flow figures etc.
http://www.protopline.com/223500020a.htm

I havent bought the cam yet as that will be determined by final flow figures for the heads (600hp flow target - im guessing that would be achieved at 700 thou??), but my engine builder said it will be around 260 @ 50 thou, 110 LSA. It will be custom ground to suit.

I have the 750 double pumper Holley from my old engine. It may be a bit small but its going to be thoroughly worked over to get the most out of it. Later on I might think of a BG.

deuce_454 im looking for huge torque @ 4000rpm where the convertor will slingshot at. A nice 450-500lb should do it

Sorry I cant give you much more info, Ive bought most of the parts but critical components like final cam specs and flow numbers will be left to the last, although we have a good idea of what we want.

Im just hoping im on the right track

If anyone has specs and HP of their 400 combos I would be very interested in them. Any suggestions are welcomed.

[lluciano77]

Originally posted by killerformula
I wouldn't push that block any harder man...

You'll get your 500 horse, but you'll have to put some R's on that motor, something 400's aren't awefully good at.

Just some stuff to watch for, it sounds like a mean motor, you'll have tons of fun with it.

Enjoy-

K

MY 400 spins to 6,500 easily. Of course, nothing is stock in the bottom end. 5.7" Eagle lightweight rods, and ARP rod bolts help. It has an Eagle crank and KB pistons. It is also rotating balanced.

[kellogs]

My 511 block has the factory crank and rods with hyperuretic pistons and turns 6500 no problem. It floats out around 7000 with the hydraulic cam. It pushes out about 450 hp with AFR heads. I always hear that 400's will not turn many RPM's but L beg to differ. And yes I drive mine on a regular basis.