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Old 08-20-2003, 06:49 PM
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stroking a 400 sbc

i want to stroke a 400 sb but dont know how big i can go without mager probloms and big bucks.the block is bored .020 over 2 bolt main .a 400 crank is 3.75 stroke and i hear 3.8 stroke is no problom but how much bigger can i go and would it be a good idea to go 6 inch rod or is that pushing the limits

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Old 08-20-2003, 06:58 PM
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I read a magazine article the other day about a complete assembly- 400 pistons, 6" rods, 3.873 stroke steel crank and SRP pistons for like $1700.00, I couldn't believe it, the unit costs alone were higher. I called my suppliers and none knew anything about this assembly, SRP rep says they make no such piston, their JE piston division wants a little over $850.00 just for the pistons. I will keep trying to find out about this assembly, I WANT ONE! but it may be just some mag writers fantasy.
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Old 08-20-2003, 07:10 PM
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wow for that price i would buy 2 sets .i was reading a magazine yesterday on building a 454 sbc wow!!!!!!!!!must be a aftermarket block if i remember it was a 4.250 bore .scat has a 3.873 crank for 500 bones what would that be in cubes with a 4.125 bore .bob if u find that set please post were u found that deal
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Old 08-20-2003, 07:25 PM
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The biggest stock block engine i know of is around 420 cubic inches.Alot of the late model dirt trackers use them.
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Old 08-20-2003, 07:40 PM
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I have used a stock 400 crankshaft (3.75 stroke) and offset ground the crankshaft to fit small journal 5.7 rods and ended up with a 3.84 stroke.

With a .030 overbore....I ended up with a 416+ inches.

On the cheap (for a stroker).......



.
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Old 08-21-2003, 08:22 AM
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doug herbert racing
4340 forged steel crank
j-e pistons
pro-tech 6.0 h beam rods
childs&alberts dura moly rings
clevite 77 h rod/main bearings

421ci 3.875x4.155....1799.95
434ci 4.000x4.155.....1799.95

what kind of machine work would i have to do to get that 4 inch crank to spin in my 400 block.ive done 2 383 strokers with very little grinding but never had a 400 block dont know much about them .434 would be a super torq monster
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Old 08-21-2003, 11:30 AM
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You'll have to do alot of Grinding on the pan rails and block filler.....lots and lots of block filler.


I don't think its possible to get a 4" stroke in a stock 400 block. All the guys around here with 434s use aftermarket blocks.
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Old 08-21-2003, 12:31 PM
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Quote:
Originally posted by Deuce Roadster




I have used a stock 400 crankshaft (3.75 stroke) and offset ground the crankshaft to fit small journal 5.7 rods and ended up with a 3.84 stroke.

With a .030 overbore....I ended up with a 416+ inches.

On the cheap (for a stroker).......



.

Problem here is losing all the meat between the rod and crank journals(overlap). Greatly weakens the crank.

Chris
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Old 08-21-2003, 04:54 PM
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I helped two of my buddys build 434 strokers they both used Dart 400 4 bolt Blocks.. I don't know what kind of crank.

Billy's 434 is in a '67 Chevelle.. He uses Canfield aluminum heads with 2.10/ 1.625 valves, Forged pistons that were figured to have a little over 14:1. He runs a 645/654 lift cam, 1050 Dominator Carb, Super Victor intake, 1 7/8 headers with 4" exhaust and some weird looking mufflers that sound great. He also put a Direct injection Nitrous kit where it shoots it right in the intake.. it will run 300hp but the most he has shot it is 100. With this set-up and with 100 Nitrous the car ran 6.62 @121 in the 1/8th. The car is a 6 point Cage with stock suspension and ladder bars with MT ET street tires. He just let me drive it last week and it is soo bad *** started going sideways about 60 and all over the place but I stayed in it.

Denny put his in a '69 Z28 Camaro.. His has Brodix heads I dont know what model, they have 2.08/1.60's and 64cc chambers. He runs a 950 Holley and Teag G intake, 615/618 Lunati Roller cam same pistons with 14:1, Super Comp headers 3" exhaust with flowmaster. This car without Nitrous will run 6.68 @118 1/8th and we're going back this Sat and he thinks it will run 6.50's this time.
He dynoed this car and it made 436 Rear wheel Hp and 582ftlbs of torque, that would be intresting to see Crank #'s I bet it has over 600hp. These cars are SOO fast and they drive them on the street occationally, talk about getting put in the seat they will do it.

They both use TH350's and 5500 stall.. I'm not sure the gears
They are TORQUE monsters for sure.
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Old 11-08-2003, 09:16 PM
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434

MADDOG RACING is where you can get this kit for the best price. I think they quoted me 1499$ They have a virtual store on ebay.
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