5spd-iroc

ive only had my afr headed 406 in my car for about 6 months now but was thinking of doing another build this winter, heres the plan-

Shortblock--Wheeler Comp series 434ci 4.125” Bore x 4.000” Stroke x 6.000” Rod
Operating Range 1,500 - 7,000 – Max HP 725

Heads--Dart 11711143P - Dart Pro 1 Aluminum Cylinder Heads

intake and cam i am undecided on, i have a vic jr right now on my 406, i want this motor to peak around 6500 but turn 7000 no problem, im also on the fence if i should run this 11:1 or 9:1 with a procharger. i was thinking i should be able to get 650 hp n/a what do you guys think, this will have a t56 behind it so no need to worry about converters, what would you guys pic for cam and intake for both n/a and procharged? thanks for any input

Orr89RocZ

iTrader: (20)

Assuming solid roller for this one. Id go super vic type intake thats been worked over. Actually there are other brand intakes that are better out the box. Holley has a few. Feeding a 434 takes alot of airflow. Out the box the super vics are so so and really should be ported for best power and air distribution.

Heads are ok out the box but could also be improved with alittle hand cleanup work. You could go bigger too. Afr 235 wouldnt be bad either or one of dr j's airwolf 245's or chad speier's 230-245 offerings.

Cam should be in the 270 deg range at .050 for solid roller, mid higher 600's lift. For natural aspirated.
Blower car can get much milder on heads cam for power. If you are considering blower you are lookin at 800 hp+ with those big heads and decent cam in the 250-260 range duration at .050. If less hp is desired id run a 210 cc head and mild 230's deg hyd roller. Still make 700 without breaking a sweat

5spd-iroc

yeah i was thinking about running the d1sc or something similar, do you think i should run a 245cc head if i go the blower route or are the dart pro1's ok, i would like to see 800-900hp boosted if i could, i dont mind a bigger lumpier cam if i can squeeze some more out of it, i planned on running felpro head gaskets and arp studs any other recommendations?

Orr89RocZ

iTrader: (20)

D1 is pressed hard to get 900 but it should get near 800's as i have heard 800 whp which would be 900-ish motor hp.

If you do that 230 darts would be more than enough. I made 800 with afr 195's and a small cam on a 400. My new setup with 245 heads and big cam should destroy that number but i havent tested it yet. Butt dyno feels promising tho. N/a needs more head to really shine but blowers can use smaller heads just fine too. Either way you will have plenty of streetable low end power

If you go boosted i'd stay hyd roller for simplicity but solid roller will do fine too. All up to you. 9 to 1 comp and a good blow thru single plane you should make your goals. F1 blower would be better choice. Talk to steve morris at morris racing engines. One of the top procharger blow thru guys around. He will match heads cam for you.

5spd-iroc

ok do you think that wheeler shortblock can handle 900hp at lets say 6500 rpm? it says 725 but if its all forged and balanced i dont know why it wouldnt, i dont have a charger yet so thats still up in the air i could go the f1, i kinda like the self contained ones for ease of no oil lines

Orr89RocZ

iTrader: (20)

Not to familar with those but quick look says it should handle it. Concerns would be the block tho. For the price it appears its a gm based block which may not survive a long time under that power and rpm. My buddy cracked one after spraying it into the 9's for 4-5 yrs which is alot of abuse but seemed like a freak of nature compared to some stories you hear about 400 blocks breaking with only 500-600 hp. Dart shp is better but also 1800 bucks more. Its what i run and my buddy now runs. Proven to hold good power even tho i heard it was rated to 600-650 hp. Thats totally conservative by dart

cuisinartvette

Id build forced induction way easier to make the power and dont have a finicky expensive valvetrain to maintain.

Get your plan cemented first then hand it over to wheeler and let them build to suit. Youll want nothing but premium parts in that bottom end to handle that kind of power. No cheap Scat stuff. Keep us posted sounds like fun
Ditto on ditching the Darts. by the time you put the work into making them sing youll spend more than if you got a better head in the first place.
Larger-better flowing head=more power with less boost.
You can get away with a big head with blowers...and need one period wtih that CI

5spd-iroc

yeah id like to stay away from the 18* degree stuff cuz it gets expensive quick but am open to suggestion on heads, post links if youd like

1gary

Buying a package deal in a 434,you don't know what they did to sonic check wall thickness. At those blower hp ratings you would want no less than .180 on the finished size for the skirt and .150 for the finished size for the wrist pin sides.

Building your own you would be able to chose what machine shop did that work.

1gary

The SHP's aside from being thick wall are also thick deck for blower applications and have a much better cooling system built into them. Lots of options you can get into after that. One huge advantage is the rebuild-ability of the SHP's over the stock GM stuff. And if you spread the costs over yrs because built into the SHP's is the reliability,really you end up saving money.

5spd-iroc

i checked out cnc motorsports and i can build one for about the same using dart block, compstar crank and rods, or i can go eagle for about the same price, which is better?

Orr89RocZ

iTrader: (20)

Compstar i feel is better. I was talked into them by my machine shop guy Carl at cnc blocks northeast. He feels they are better than eagle and i have been using them at 800 hp for 2 yrs and still have them now. No idea what i am making now tho, but plan is for 1000-1100

5spd-iroc

well the build may be on hold, just submitted an offer on a house so gonna be strapped for extra cash, being 21 tho i guess i have time lol heres a pic of the car btw and one of my truck just for **** and giggles