haystack71

What would you guys change about this combination

It will hopefully someday be going in my 71 chevy pickup 2wd

I'm not sure about tranny or rearend yet so suggestions on that would be great too.

434 sbc

10.5 Compression Ratio

AFR 220cc Race Ready 2.08/1.6

850 Dominator

AFR Single Plane intake

And I really have no clue on cam choices. I want something fairly streetable but also something that I can take my truck and be able to surprise some people with it. The trucks gonna be lowered and have some serious tweaks done to the suspension, nothing for looks just a serious older truck.

Well put in ur opinions and lets see what we can come up with, thanks guys

CTSV05

I have a 421, and overall am happy. But a 220 23* head is a little small, at least for me.

But for throttle response and drivability, they work well.

Are using a stock block? If so the chances of rod to rail clearence are slim, and some grinding will be needed.

I splayed my block, but did not fill it as I wanted to drive mine on occasion.

Honestly I would look for maximum torque for your truck, I would run a camshaft in the 600 lift range, a 110-112 lobe center, and about 250-260 @ 050 on the duration, focus your power in the 3500 to 6500 range, this will get that heavy truck moving.

LOnSLO

iTrader: (15)

with a 5000 rpm stall that should do it.

If you're going to make this streetable, downsize to a 750 double feed. That 850 will run like crap at low rpm. What block are you using? Will this be a roller motor, or flat tappet?

slow trap

iTrader: (22)

i disagree with a 750 cfm carb.with a 434 ci motor i would go no smaller than a demon 850.signal strength still should be good,especially with a long stroked,high velocity type head.my 406 drives great with a 3500 stall,825 mighty demon and 3.73s.afr 227s i would use with a comp 264/268 @ .050 .660 i .630 e valve lift. peak hp should be around 6500.oh yeah,turbo 400 with a 9 inch & 3.70-4.10 cogs. thats just my .02 tho.

lifted99

Good choice on the 434, although it is one of the more expensive small block combos. I would use the 850 and get someone to dyno tune it with your carb (it will make a huge difference in performance and driveability). Just out of curiousity, why not go with a more common, and possibly cheaper big block combo that will make the torque you need to get the truck moving?

haystack71

I looked at a couple of your suggestions for cams using desktop dyno and the best I found was somethin with 275/280 duration and 474/510 lift

according to desktop dyno i'm lookin at almost 692hp@6500 rpm and 613tq@5000rpm

haystack71

ohh and I went with a 434 because I have a good 400 block sitting in my garage and I'm a smallblock kinda guy

CTSV05

Is that at 050 or advertised.

And there is no way in you know where you'll make 700 HP with a 500 lift cam, impossible!!!!!!!!

You have some #s off somewhere!

haystack71

thats seat to seat

lifted99

Yeah, you are gonna need a lot more cam. I think you got a bad copy of Desktop Dyno. Gonna need to be closer to .600 lift or more. I have a .591/.597 solid roller in my 355 Nova.

slow trap

iTrader: (22)

my current cam in my 406 is 259/267 @.050 &.638 /.638 lift.hoping for 550-575 hp.to get 700 hp in a 434 you would need atleast a stick with 10-15*at.050 and around .700 lift with great heads also.the 264/268 cam i suggested is proven for 650 hp .look up speed-o-motive for dyno-graph.

nosfedgta

There are soem good ideas floating around here. BUt for streetability none of the above cams would be a great choice. I have had many diff motors for srteet and strip. anything over 260@50 is no fun on the street. My old combo was a 406, ported afr 210's, 11.7 comp, solid roller 266-276@50 and 649-659 on 112ls I drove it around on the street alot, but it was not all that fun. Car ran 10.70's at 127mph with a raceweight of 3400lbs. The motor made power for sure, but not very fun on the street. Not to mention the duty cycle of the valve springs is short lift with big solid rollers

With 434 cubes you will have plenty of torque!! I would go with some race ready afr 220's a comp cam part number 12-772-8. Its 248-254@50 and 576-582 lift on a 110. Also afr does not offer that intake anymore. You can get the same one from proffesional Products. Its the SAME intake at a great price.
As for carbs the 825 demon is a great carb as is a 750 or 950 quickfuel.

Hope this helps you out. If you have any questions on some afr heads let me know, I am an afr dealer.

haystack71

dang, you were right about the torque with that cam. How do i get more torque, my truck with me in it was gonna weigh about 4100 lbs with me in it.

slow trap

iTrader: (22)

the cam suggested by nosfedgta should be a torque king in a 434. my friend has the same cam in a 383 .the bad thing is stock 400 blocks are prone to cracking under excessive cylinder pressure.good luck whatever route you decide.