Im planning on building a 500-525fwhp 400 sbc. right now i have a 400 engine 2 bolt main. i would like to keep the stock crank. i dont want too high of compression because i want to put about a 150hp shot of NOS on it shortly after. i want to buy some decent rods maybe eagle H beams and some forged flat tops. i was thinking possibly AFR 195's and a Weiand Team G intake and an 850 Holley DP. not sure which cam would be the best. anyone have any proven numbers. id go with the 5.7'' rods and pistons to match.

 

i am currently having my 406 put together. i am running a stock crank, but it has been nitrated, the block decked to .005 in the hole, running mahle pistons on eagle h-beam rods, 6" in length. a custom roller cam with .510 lift and 236/240 duration at .050 with afr 190 cc heads. along with a holley contender intake, dual plane but may change later to a air gap rpm.
And the compression works out to somewhat friendly 11.0 to 1. should be up and driving in the next two months. finally all the machine work is done. wanted to eng dyno it but will have to suffice with chassis dyno!!Desk top dyno computes to 545 hp at 6k rpm. sounds reasonable.

 

Theres no way i would speed all that money and run a stock crank. For $200-300 you can get an aftermarket one that doesn't need maching and is alot stronger. It really make no sense to me.

 

with your setup i probably wouldnt go with the rpm air gap, i matched a 1205 gasket to it and it was smaller than the gasket by quiet a bit, i wrote edelbrock an e-mail about it. they are supposed to be gasket matched or port matched to the 1205, my rpm heads are, but the intakes deffinately arent.

 

400 2 bolt bored .020, 6" Eagle rods, stock crank, SRP flattop pistons, zero decked, 242/242 .603/.603 solid roller, Brodix RR200 cnc heads with some port work, MiniRam intake 36# injectors.

I aimed for 11.0-1 compression.

www.geocities.com/dzperf

 

sounds like a pretty powerful motor, any dyno #'s or anything?

 

Sig. No numbers on the engine until spring.

 

the stock crank was free. it should be strong enough for my intended application. i don't plan on going over 6500 rpm and the stock crank should be good up to 600 hp??? i would figure. i know these 400's never made that kind of power before. the crank's i have seen that i would want, are a grand or more. yes, i know i have money in the heads, pistons, rods.....

 

yeah im only looking for 500hp possibly to the motor and a 150shot of nos on top so im thinking 10:1 w/ forged pistons. the motor wont be brought over 6k maybe 6200 or so. what type of intake would be the best to get for this application?

 

How about a 650 horse 434 or a 515 horse 383?

 

I’ve run a large number of intake combinations over the years and by far the best combination in the 500 horse range is the Brodix HV 1016 ( http://www.cfm-tech.com/catalog/hv_1...pla_787395.htm ) using a 1” street sweeper spacer ( http://www.cfm-tech.com/catalog/_st4150-4_769312.htm ).

Pulls from go to whoa. I’ve run this combination on 11:1 400s with Canfield and AFR heads with hydraulic cams as small as 228/236 – 110 (2800 stall) and solid flat-tappets as large as 256/266 – 106 (3200 stall). It will perform better than a Victor Jr or Team G under 6200 and come close to matching power at 6500. The only way you can get better ETs with a different intake on the same engine is going with a HV-1000 large port single plane Brodix which will add more HP at a higher operating RPM range,,,, which will require you to run more gear and more stall converter to see the full benefit.

I’ve never run or installed a RPM Air Gap. By all indications, the Air Gap might have a slight edge on the HV 1016 Brodix,,, but I know the Brodix and the spacer DEFINETLY works miracles on a stout 406. Top it off with an annular discharged 850 Holley or BG carb for fuel injection like throttle response,,, especialy if you go with a smaller sized quick rise rate soild lift cam.

 

i have an RPM Air Gap for my 406 in my camaro now. but i havnt been able to run the car(still need a carb ect.) it seems 15-6500 isnt too bad of a range. i dont want to go with a victor, that brodix intake looks decent. i did a desktop dyno on my current motor and it said 417hp 528lbs of torque. i obviously could use a higher CR but i didnt want to run any kind of race fuel, maybe a gallon at the track. i run 87 all day long but im thinking i might want to run higher maybe 10.5, id probably have to run thin head gaskets. but anyways. im thinking somewhere from 575-600 lift hydraulic cam, maybe a roller, im not looking to spend a SH*T load of money in it but i want a good motor, im not sure if any hyd. flat tappet cams hold up fine in high lift applications. something where i can run a 150shot later down the road

 

Mines in the sig, trapped a 129.89 with under 10 degrees of base timing and an off the shelf carb

 

nice vid. what tranny are you running? no way thats a stock T5.

 

bone stock T-5 with about 170k on her and a 7.625 rear with richmond 3.73s, mini spool and a summit support cover

 

My setup ran 11.20's @ 120mph with a 1.53 60' time.

406
stock crank
6" h-beam rods
forged flat top pistons
10.4 compression
AFR 195 heads
TPIS ZZ-X hydraulic roller 241@.050 .559 lift small base circle
Comp retro fit hydraulic roller lifters
Hooker super comp headers
Victor jr.
Mighty Demon 650
Mufflex y-pipe and 4" pipe to a spintech dual outlets
th350
BTE 3400 stall converter
10 bolt 7.5 3.73 gears
26 x 11.50 ET Streets

I switched to a 9" with 3.90 gears and a 150 shot it went 6.70's @ 106mph with a 1.47 60' time at an 1/8th mile track. I estimate that on the 1/4 it'll go 10.50's. I have a second stage that'll be used in the spring. Hoping to hit the 9's.

 

impressive setup, i am considering the victor jr. intake as well but id have to build the bottom end pretty stout to rev out to make the high rpm goodies worth it.

 

hey 94-6sp, is that 11.20 with only motor?? just cause, i will be runnning close to what you are with only motor.

 

Yes, that is all motor. I built it to hopefully just get into the 11's but it exceded that by far. I would have been happy with an 11.99.

 

Thats dope, congrats, my 60ft is killin me

 

Sig

 

yea, i'm looking for any thing in the 11's. to go from a 14.5 to an 11.XXX will just be awesome! skip 13's!, hell just skip 12's too!