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Old 04-15-2007, 12:53 PM
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400 sbc buildup

Hi. I have a 66 acadian 2 dr post i'm going to make into a faster race car.(was a bracket car). I have a 400 sb 509 2 bolt block and crank for a start point. I want to get the car into the low tens or if possible high nines. i'll use a glide, i have a 9.5 converter that stalls around 4800, and i'll back half or mini tub it.(not decided which way to go.) I want to go n/a, no nitrous. I'm looking for information on other setups with the 400. How fast and what's your combination. I think the best plan is to have one. LOL! If you could give me any ideas on your combo or what you have built in the past, It would be greatly appreciated. Thanks. Barry.

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Old 04-15-2007, 01:55 PM
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You mean something along the lines of this stock block 700+hp ported Brodix 18X degree head, stock cast crank 406ci SBC Nova? The recipe for this one is actually pretty simple.
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Old 04-15-2007, 02:07 PM
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yea. Something like that. What is your combo? i know i will need to get a great set of heads. What compression are you runnin?
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Old 04-17-2007, 11:34 AM
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Quote:
Originally Posted by probird
yea. Something like that. What is your combo? i know i will need to get a great set of heads. What compression are you runnin?
This is a car that my friend built. Was almost 4000lbs so you should get even better results.
Block 509 400 2bolt +.030 installed studded 4 bolt mains.
machined for o deck height, Arp head studs.
Heads: Brodix 18X heads hand ported, flow was in the 350cfm range- It was not that hard to achieve this flow Mostly general porting and valve guide thinning and profileing. nothing special.
There are bolt on manifolds available for these heads now.
At the time, he had to modify a 23deg manifold to fit the 18X heads. Used a Protopline manifold with a 4500 carb adapter welded on. I believe Dart sells a bolt on manifold now.
These Brodix 18deg heads use standard 23deg valvetrain.
But the valves are longer than stock (I believe +.600")
Thats the beauti of these heads.
Contact Brodix for the details www.brodix.com
Holley 1050 4500dominator carb.
Pistons were JE flat tops +.030 for a 5.7" rod (requires custom piston valve notch clearance machining.) there may be a JE piston now that has the required valve reliefs already.
Rods were Eagle H beam 5.7"
Crank was a stock GM 400cast crank that was "Iced" (cryo heat treated) This made a big big difference.
Ground with wide corner radii uses hi perf "H" bearings.
cam was a Comp cams custom grind # CS304R-8 /312R-8 SR13
304-312 adv 276-284@.050 .440" lobe .660"(1.5) .704" (1.6) You must specify a .900" cam base circle. 113LSA installed @109*
This was a Nitrous Cam but ran faster than other cams tried while on the motor. Contact Comp cams to order it. Cost is the same as any other comp roller +shipping.
The finished cr was 12.59:1 (56cc head volume) used profuels 110octane 'Mark II" fuel and "Mark V" while on the nitrous. Pro Fuels
The headers are Custom built 2" primary. Spread port flange. Also avaialble in standard ex flange.
At the time of this build these 18X heads were just out (first run). Now Brodix has a complete top end package using these heads. I highly recomend it.
This motor ran great N/A and made over 1300hp on Nitrous.

Last edited by F-BIRD'88; 04-17-2007 at 01:34 PM.
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Old 04-17-2007, 12:00 PM
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Thanks f-bird88. Thats the ideas i'm looking for. sounds like a top end kit, roller cam and good rods and pistons are the ticket. I have no problem using race gas. If anyone has any other ideas/Combos please let me know. Barry.
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Old 04-17-2007, 12:12 PM
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You're running 1300 hp on the stock crank???? Holy$%&%*^(!!!
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Old 04-17-2007, 12:31 PM
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Quote:
Originally Posted by 427v8
You're running 1300 hp on the stock crank???? Holy$%&%*^(!!!
Pretty amazing isn;t it. Never had a problem with the crank.
Broke a few pistons from improper nitrous tuneup and took out the main trust bearing from a transmission failure but the crank always looked pristeen on tear down.
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Old 04-17-2007, 04:07 PM
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And use a very good machinist! What do you mean "iced"? Who did it and how much. Tks.
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Old 04-17-2007, 04:29 PM
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Quote:
Originally Posted by 427v8
You're running 1300 hp on the stock crank???? Holy$%&%*^(!!!
HMMMMMMMMMMM 1300 horse right on the money was this another DD or actuall put on a engine dyno. Why do Dart and GM build peformance blocks.

The other engine builders I deal with would not even attempt to try this as it takes a lot of good parts and a a fair amount of money to build an honest 1300 horse and using a stock block and crank HMMM

My point of view its hard to believe that this is factual info. This sounds like a world record.

KIDS DON'T TRY THIS AT HOME
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Old 04-17-2007, 04:52 PM
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Quote:
Originally Posted by CNC BLOCKS N/E
HMMMMMMMMMMM 1300 horse right on the money was this another DD or actuall put on a engine dyno. Why do Dart and GM build peformance blocks.

The other engine builders I deal with would not even attempt to try this as it takes a lot of good parts and a a fair amount of money to build an honest 1300 horse and using a stock block and crank HMMM

My point of view its hard to believe that this is factual info. This sounds like a world record.

KIDS DON'T TRY THIS AT HOME
Agree with ya there. It was a wild ride for sure.
If a car goes 158MPH in the quarter and weights 3800lbs how much HP does it have to create? Short answer is 1388hp. You do the math. This was no sleek bodied areodynamic car either (1974 Nova)
This was a stock GM 400 block with a stock GM cast crank.
He was feeding it an insane amount of Nitrous for sure.
Busted the motor twice dialing it in. (broken pistons, requireing a cylinder sleeve each time) used to eat th400 transmissions on a regular basis. You try launching a 3800lbs car using 600+hp shot worth of NOS right off the line. LOL
Was dynoed more than once N/A in excess of 700hp.
Dyno shop would not let him test on the Bottle. (can't blame them.)
Was the real deal, no bull. People used to come over in the pits, look under the hood and shake their heads.

Other than needing two sleeves when the 2 pistons let go.
(no block would survive that) the block and crank were never a problem.
Ran very consistant without trouble N/A at over 700hp.
Once the Nitrous was sorted out their was no more issues with the motor. Ran very hard without busting.
Transmissions, were another story. Mostly because of the cars heavy weight.

Last edited by F-BIRD'88; 04-17-2007 at 05:18 PM.
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Old 04-17-2007, 05:13 PM
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I don't really want to use nos. but i want to build it good. I may try it one day but running it in the class i want to is not used. here is some pics of the project.[IMG][/IMG] Any other ideas? This was a former race car. want it to be a fast race car. LOL Tks. Barry.
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Old 04-17-2007, 05:15 PM
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Quote:
Originally Posted by probird
And use a very good machinist! What do you mean "iced"? Who did it and how much. Tks.
No motor will make big power and stay together for long without proper precision machining. "Iced" refers to cryo heat treating. It was done here locally. Was something like $175. Its not perticulary expensive. There are lots of other places in North America that do this. No sure if the shop that did this is still open. Basicly they cool the part down to a very low low temp using liquid nitrigen and then slowly bring it back to room temp in steps over a period of time. Really strengthens and relieves stress in the grain structure of a metal part. Effects the whole thing all the way throu not just the surface like other conventional heat treating methods. Can't knock the results. Works on cams, lifters, rockers, gears etc etc.
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