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Thread: 400 sbc questions, all subjects

  1. #1

    400 sbc questions, all subjects

    Hey guys i got alota questions and am taking all advise. First of all i am building a 406ci sbc, its a 509 block. The purpose of this engine is pump gas street/strip, 1989 camaro with 3.73 and th350 2800-3000stall, looking to get sumwhere hopefully into high or mid 11s. The parts i have now is the stock 509 block and a set of Brodix Track 1 heads that i picked up for less that 1/5 of the original price. The heads have 2.02 1.60 valves and have been milled down, bought them from machine shop said about 58cc chambers, and have had some port work done. NOW here goes the questions.
    What should i do as far a crank and rods. when this engine is done its done maybe a 150 shot of nitrous but other than that it is what it is. Can i get by with sumthing like scat 900 crank and scat I-beam 4340 rods. Im looking at 6500 rpms max. Im on a tight budget but i dont want to scatter it all over the place.
    Next is pistons, im looking at forged pistons even with the extra expense, im looking at around 11:1 compression, is that ok on pump gas and can i get 11:1 with flat tops with the small champers?
    Next is Cam im was thinking around 276 adv dur or maybe a little bigger with sumthin around 500 to 525 lift so it will run pretty good on the street and have the rpm range i want with good low end. Opinions?
    Now im looking for misc stuff you guys wanna tell me. Im havin it built by a respectable machine shop that builds circle track engines in the area thats y im getn ur guys advise cause i looking for more of a strait line car on the street. Can i get into the 11's with what im looking at. Thanks everybody im gona watch close so if u have anymore questions ill be around to answer them.

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
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    496
    HIGH 11'S LOOKS GOOD.I HAVE A 30 OVER 400(406)WITH PRO TOP LINE HEADS 64CC,286DUR.510LIFT CAM,4340 CRANK,6"H-BEAM RODS,JE FLAT TOP PISTONS, TURBO 350,3400 STALL,750 HOLLEY,3.90 GEAR.86 SS MONTE CARLO WITH FULL INTERIOR AND FULL EXHAUST(2 1/2")CAR WEIGHS 3540 WITH ME IN IT AND IT'S BEST TIME IS 11.90 1/4 MILE.

  3. #3
    Senior Member RACING JUNKIE
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    I don't know what the car weighs, but i think you can get by with a cast steel crank, i would however change out the rods to "H" beams, i think they are a little stronger. On the pistons if you're going spray it i would definately go to forged pistons. Probe make a 2618 piston that can be bought for around $400.00, flattops will get you close to 11.00 to 1 with the small chambers. Can you get into the 11's with this combo??, i think so if the car weighs under 3500lbs without nitrous with an 850 carb and a torquer or airgap manifold. You may need more stall in the converter, maybe 3500.

    JMO

    Zip.

  4. #4

    406

    thanks guys the car weighs 3200-3400lbs, ill step up to a bigger stall and the h-beam rods. keep the responces coming im open to any suggestion

  5. #5
    Senior Member EXPERT BUILDER
    Join Date
    Jan 2005
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    336
    i agree h beams r cheap on ebay.get the 4340 cheapie like hawks or cat.plenty strong for your application.


    forged pistons and no regrets.make sure ring gap is a lil bigger with nitrous.

    call comp cams

    crankshaft is a what can u afford!cast might be a stretch.see what cnc-motorsports.com has.they always have specials!flatlanderracing is another good one.

    vic jr with a plate 150 shot with all else equal should land you in high tens with a lil luck.if you went roller with cam then no prob

  6. #6
    Senior Member RACING JUNKIE jmarksdragster's Avatar
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    Stick with an I-beam, Scat, Callies, Eagle, Howard. Shy away from the e-bay cheapies, you want ones with quality machine work and bolts. Same goes for the crank, much better machine work on the name brands. You don't want to buy them twice when it breaks or have to re-machine.
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

    Good work isn't cheap, and cheap work can't be good.

  7. #7
    Senior Member RACING JUNKIE mytmouz's Avatar
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    I like the I beams also. I did get a set of the Hawks 6 inch h beams off feebay earlier this year though and they were extremely nice for the price. They have held up great in a dirt drag truck so far...
    If you think nobody cares, try missing a payment...

  8. #8
    Senior Member EXPERT BUILDER
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    I would recommend the Scat 4340 I-beam with the 7/16 cap screw they are about $250 and rated at 700hp. I have a set in a 377 now and have had no issue's. I recommend comp cams 306S cam it has 260 dur and .555 lift powerband is 3-7,000. Great Cam and its not a roller so it keeps the cost down. also that 377 has the scat 9000 series crankshaft too. 8)

  9. #9
    You should be able to run 11.80's to 11.90's falling out of a tree with a JUNK YARD 350 and a decent solid lifter cam. A 400 plus C.I. and your heads better run low 11.00's to 10.80's. A 150 shot better put the car in the 9's. If not I would be embarrassed and sell every thing ops: . Suggestion on headers, small blocks will like a 1 x 3/4 dia primary tube ..

  10. #10

    406

    lol thanks guys i hope your right about low 11 high 10 i got a buddy with a 67 belair with a 350 edelbrock alum heads supercharger 10 psi th350 3500 stall and 4.11s out back ran 12.3 before supercharger then he blew it up. just want to be able to show him up hopefully all on motor. thanks guys

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