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Old 06-25-2012, 06:02 AM
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412 sbc questions

I have a 2 bolt main 400 sbc this is what has been done to it so far
90% stip 10%street
+.060 speed pro flat top hypers 10.5:1 to 11:1 static compression
Hastings plasma moly rings
Eagle sir 5140 5.7 rods arp rod bolts
Strock cast steel crank turned 10 10 arp main studs
sfi 18.1 external balnced flex plate and balancer
Clevite rod and main bearings
profiler 210cc intake 64cc chamber heads steam holes drilled of course
Comp cams magnum 292 duration
1.6 ratio rockers
victor jr intake
holly 850 dp
Running on 110 octaine
Thr question is will it be safe to turn this motor 6500 rpms?
What would a good hp estimate be?
Is a 150 shot of no2 out of the question? I have expirence with it and have never had any detonation issues but was on a forged piston 355
Any expirience or what i can do to make the combi better would be much appreciated.

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Old 06-25-2012, 06:18 AM
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Ideally you'd bite the bullet and put splayed caps on it. I'd say w/studs and if the rotator is balanced, 6500 will be OK. Personally, I wouldn't spray it. If you do, a timing retard box is cheap insurance.
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Old 06-25-2012, 06:22 AM
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Programable 6al2 is what im using never messed with the program just alwaysed manually reretarded the initial advance when spraying
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Old 06-25-2012, 07:25 AM
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Quote:
Originally Posted by dcarter21
Programable 6al2 is what im using never messed with the program just alwaysed manually reretarded the initial advance when spraying
That's what most everybody does. The problem w/that is off boost you have less than ideal timing. That's not a big deal, but it does mean the car won't et quite as well as it could.

And you have to pop the hood every time you want to hit the bottle. Which might be a good thing- keeps someone from using the nitrous on a whim. Or in anger.
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Old 06-25-2012, 12:05 PM
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I pull 2 degrees for evry 50 hp then make a pass do a plug read then bump the timing up one degree untill i get right on the edge of detonation this is on a forged piston motor though
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Old 07-10-2012, 09:39 AM
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RPM adds drastically more stress on the block than HP output. I would keep RPM to 5500 and spray it before I would turn it 6500 and not spray it.
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Old 07-10-2012, 01:39 PM
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The wider cap on the 2-bolt main 400 block keeps the caps from walking, behaves much like the 4-bolt 350 caps. 2-bolt 400 caps are very similar in form to 2-bolt BBC caps.

I've run 4 different ARP studded or ARP main bolted 2-bolt cap 400's to 7000+ rpm with no main bearing problems in street/strip engines (low 11's/high 10's at the strip and 3500 street miles a year, 3000-3500 lb cars). Only problem I've ever had with 400 blocks is cylinder wall durability at 550+ hp.

.060" over is really pushing it, but no way to really know if there is a thin spot without a sonic check. The one I ran at .060" over and 450hp ran two summers then split a cylinder wall, even with the block half filled with Hard Blok.

6500 rpm wouldn't worry me at all.

Should have put forged pistons in it tho'... The hypers will take 150 spray...as long as you absolutely keep the tune correct. Miss the tune once and/or detonate it and the pistons will be in the oil pan.

Just my opinion, ...but you should really consider a solid lifter cam...the only way to fly Easy 50hp gain over your old school 292 Magnum.

As it is, 450-500 hp depending on how good the port work is on the Profilers, as-cast would be at the 450 hp end. Good porting and a nice solid cam could have you in the 540 hp area.
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