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Old 02-08-2009, 09:53:56 PM   #1
AmericanMuscle
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A good 600+ hp SBC combo?

Ok well the time has come to put a new engine in my Dad's 1969 Z28. He wants a small block engine and atleast 600 hp. This is intended as a "street" car, that belongs on a race track. I was thinking of a 383 with AFR 210 heads with a large dual plane intake if possible. A holley 780 dp, and a MSD 6Al ignition. He wants 11:1 compression, because thats what he raced with. The car currently has a M22 trans and 3.73 gears in a 12 bolt rear. I am trying to persuade him to go with a hydro roller retrofit cam set.

Now my questions are:
What intake to use?
Which cam to use?
Will the trans hold up?
Any recomendation on a rotating assembly?
Are these the right heads?

Sorry to bug you guys but I figured you all have tried all of the combo's imaginable.
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Old 02-08-2009, 10:03:43 PM   #2
1970camaroRS
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Tell him to build a solid roller, 6.0L, L92 headed, carb'd LSx motor.

Either that or a 434" SBC with larger AFR heads and a solid roller.
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Old 02-09-2009, 01:33:29 AM   #3
CRead01
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Quote:
Originally Posted by 1970camaroRS
Tell him to build a solid roller, 6.0L, L92 headed, carb'd LSx motor.

Either that or a 434" SBC with larger AFR heads and a solid roller.


I agree. 600 horse out of a 383 is going to be harsh on the street. an LSX setup would probably be more friendly.

It will be especially hard with a dual plane intake.

Just my .02
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Old 02-09-2009, 04:08:38 AM   #4
mjoc
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build a 406 and throw a supercharger or a turbo. YOu can get alot more power and be very streetable.


Mike
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Old 02-09-2009, 04:25:09 AM   #5
BADBLACKZ
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Either go big inch (427 +) or something smaller with a power adder.....

As far as the M22, no, it won't last for too long if he plans on hooking the car....... With street tires and lots of spin the trans might last for a little while......
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Old 02-09-2009, 06:59:44 AM   #6
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600 HP not going to happen in a 11:1 383 without a poweradder.You could raise compression to 13:1,but it will not be streetable and the valvetrain will need constant maintenance(e.g. checking valve springs and lifters on a regular basis).
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Old 02-09-2009, 11:17:56 AM   #7
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that will be a tough goal to hit with a 383. Go BB if it was me or power adder.
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Old 02-09-2009, 12:49:55 PM   #8
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that kinda power with streetability, sounds like a turbo is what your looking for.
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Old 02-09-2009, 01:04:03 PM   #9
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I agree with 434. that would be the motor i would build if I was going to stay with the small blocks.
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Old 02-09-2009, 01:45:42 PM   #10
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I would run a blower. Make 600hp all day long on a 383 and be streetable. Or build a 450-500hp 383 with an hidden 150hp nitrous shot.

A 406 or bigger could do it with a really good set of heads, nasty cam, and a bunch of RPM. I did it on a tunnel rammed, victor jr heads, a big Comp Solid cam, and 11:1 compression on a 406.

7200rpm was needed and the engine was not a happy camper on the stock block. It ended up spitting a piston out through the side of the block (rod or block failure - there was too much carnage to tell which let go first).
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Old 02-09-2009, 03:34:35 PM   #11
AmericanMuscle
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He made it very clear to me that a power adder is a no go. Also it has to be a small block, he doesn't want to put a big block in a real Z28.

Just remember though he drove this car will 4.11's, the m22 and a high strung 327 for years on the street scene, so his version of harsh and your's might be different.
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Old 02-09-2009, 03:41:16 PM   #12
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Needs to be bigger cubes...my 434 is very streetable, and makes a little over 600 na....with 10:6 compression and AFR 210 heads....

But trying it with a 383 platform won't be very successful...and the M-22 is rated for 400-450 at the most...

You better start thinking about a TH-400 or a 4l80e swap...
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Old 02-09-2009, 03:43:48 PM   #13
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Wouldn't even try a stock block for that power level and street reliability. Not saying it can't be or isn't done successfully, just I wouldn't
The power of a high strung 327, and a 400+ inch engine is going to be a very harsh difference to a m22.
Personally I'd go LSx.
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Old 02-09-2009, 03:45:52 PM   #14
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I like the LSX option as well...but you'll spend twice as much making it come together... and I don't have a bunch of spare LSX stuff sitting around either...

But SBC stuff is everywhere...

(And I spank LSX powered cars all the time)
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Old 02-09-2009, 06:11:25 PM   #15
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Build a 427 before you go all the way to a 434, that way you have the option of a "clean up" on the bores if anything ever happens....
My 11.3-1 427 did well over the 650 mark on the pump with 93 octane, is VERY streetable in my book and if I choose to I can drive it anywhere....

Some would say AFR 227s and a big solid roller can't be all that street friendly but I beg to differ. Keeping an eye on the valve lash is the only thing thats needed to keep everything A-OK.......
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