help with 406

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project71nova · #1 Post by **project71nova** » Mon Apr 02, 2007 5:53 pm

looking to start building a 406 sbc. was wondering if any one had some good part combinations to build a healthy small block. going into a 71 street/strip nova but mostly strip. i want to stay on 91-93 octane so want a 11-1 comp. so far thinking of running eagle forged bottom end with 6 inch rods. i want to make in the 550-600 hp range and 530tq. thinking about the AFR eliminators eather 195 or 210 but i caint decide, it will depend on the cam i run. i want to run a mechanical rollar set up. thinking about the performer RPM air gap manifold unless theres a better choice to go along with the heads. anyway im open to any sujestion for this is the 2nd motor to go into my nova. now that im turning 18 and out of high school i feel its time to step up and make some serious power and put it to the ground. any recomendations for other heads? i was just blown away by the flow numbers on the afrs and have heard nothing but good about them. and what cam do u think i should run ? it can be pretty radical because it wont be street driven that much. planing on running a good amount of stall anyway.

rustbucket · #2 Post by **rustbucket** » Mon Apr 02, 2007 6:38 pm

If you are gonna stay on pump gas I would use a solid roller nitrous cam and spray it at the track. 2 eyebrow flat top pistons and 64cc heads will give you around 11:1 and with aluminum heads, you shouldnt have a problem with 93 octain. I would use a victor jr intake over a perfomer with a good 750 cfm dbl. pumper.
My 406 likes the quick fuel 950 but Im running about 12:8 to 1 compression and that would be too big for my motor on the street.
Flat tops, good heads/cam combo and a squirt of n20 at the track and that 406 will suprize you!

project71nova · #3 Post by **project71nova** » Mon Apr 02, 2007 7:04 pm

im still debating if i want to spry it or not. i dont know if i could every keep that bottle filled hahah. what size head would you recomend? this is where i kind of get confused. if i go with the 195 would i have better lower end power and rev quicker? or what if i go with the bigger 210 -215, is that more power but slugish starting off ?

rustbucket · #4 Post by **rustbucket** » Mon Apr 02, 2007 7:23 pm

I think I have lucked up with my combination but my car would not be very friendly on the street. I do drive it around the neiborhood from time to time just to piss off the neibors, but thats about it. You should find someone with a desk top dyno or make the investment, and punch in different variables to see what you like. It could save you in the long run by not putting together the wrong combo. I would be glad to share my combo with you but it would require race fuel. Im guessing mine is somewhere around 600 hp. It runs a 6.80 e.t in the eighth with plenty of bottom end tourqe.

project71nova · #5 Post by **project71nova** » Mon Apr 02, 2007 7:43 pm

haha i like your style. yea i basically want to make it a track car. only time i would drive it on the street is just to have a little fun, show off a bit and piss the neibors off lol. prolyl only see street meahh every other weekend of so. yea i might have to get that desk top dyno. but i found this combo.

570 HP
406ci
AFR 210cc Competition Package ( would get the eliminators instead)
10.1 ( bump it to 11.1)
750 Carburator
MSD Distributor @ 36° Timing
Lunati Hyd. Roller Cams 242°-252° ( little more radical cam)
.560-.572 lift 112 Lobe Centers
1 7/8" Hedman Headers
93 Octane Pump Gas

RPM TQ HP
4000 447 349
4500 509 436
5000 536 510
5500 523 547
6000 500 572
6500 463 573
7000 419 558

i think with the eliminator heads ( flow better ) more comp and little more cam it should hit the 600.

mytmouz · #6 Post by **mytmouz** » Mon Apr 02, 2007 7:53 pm

I had a 406 with an ultradyne roller, flat tops, heavily ported 292 turbo heads, victor jr., 850. It ran 11:40's all day long on motor and 9:90's with a 175 shot in a 78 malibu.

project71nova · #7 Post by **project71nova** » Sun Apr 08, 2007 2:58 pm

I have been looking around a few days and was wondering if it would be worth it to maybe step up to a 427 or 434 small block to make the 600 hp. how much harder would this be ?

mytmouz · #8 Post by **mytmouz** » Sun Apr 08, 2007 9:58 pm

Only harder on the wallet...

jones_performance · #9 Post by **jones_performance** » Mon Apr 09, 2007 7:13 pm

to put a 4in stroke in a 400 block takes alot of work, better to start off with a dart block. other heads to look at are pro actions, good flow numbers and not super expensive, you'll need a head that flows at least 292cfm to just break the 600hp mark.

the 210 eliminators IF you can get em sound good but only fully cnc ported.

DriveWFO · #10 Post by **DriveWFO** » Mon Apr 09, 2007 7:24 pm

I got tired of never getting a definite ship date on my AFR Eliminator heads and cancelled my order. I've got a real nice set of Canfields on the motor

project71nova · #11 Post by **project71nova** » Mon Apr 09, 2007 9:48 pm

yea i have seen engine buildups using a 4in stroke and looks like to much work for me. what about the 3.875 in stroke ? can that slip in with just notching the bottom of the block ? Im wondering becuase if im buying a new forged 3.750 crank then i might as well step up to the bigest stroke i can (with out getting in over my head) and as far as the eliminators i wouldnt even think about getting them with out the cnc package.

driveWFO: yea i remember reading a few posts a while back about the screwed up shiping dates. Things seem to have been cleared up at AFR but i bet they will still take awhile for me to get a hold of.

DriveWFO · #12 Post by **DriveWFO** » Tue Apr 10, 2007 7:55 am

project71nova wrote:yea i have seen engine buildups using a 4in stroke and looks like to much work for me. what about the 3.875 in stroke ? can that slip in with just notching the bottom of the block ? Im wondering becuase if im buying a new forged 3.750 crank then i might as well step up to the bigest stroke i can (with out getting in over my head) and as far as the eliminators i wouldnt even think about getting them with out the cnc package.

Not sure about the 400 block, but for a 383, you'd have to clearance the bottom of the bores and the oil pan rail. You might also need an different oil pan to clear that stroke.

sc racing · #13 Post by **sc racing** » Tue Apr 10, 2007 8:53 pm

3.875 fits in a stock block I built one a while back I used a set of Oliver stroker rods they have shorter bolts on one side to help clear everything still needed a small base circle cam.Need lots of cfm out of the heads to make good power for all the extra cubes. IMO stick with the 406"

project71nova · #14 Post by **project71nova** » Tue Apr 10, 2007 9:22 pm

yea the more i am reading about the 3.875 stroke the less i like. i dont want to go throuhg the trouble with a small base circle cam and risk of things still hitting. ok so im sticking with the 406 and have decided on the 210 AFR eliminators. Now im looking for a good cam to stuff in. looking to make max power at 6500 since im going to run a hydraulic roller. I have been reading alot of articles and it seems that i should be in the 240-250 range for duration @ .050 to make it to 6500. looking for .600 inches of lift at the valve. planing on running a 1.6 rocker ratio to get a little more lift out of the rollor. Im thinking of getting AFRs hydra rev kit just for some extra insurance ill get to the 6500 with the hydraulic. as far as manifold, i think the performer rpm air gap to keep the torque low but still have some good top end. I have seen many good things with this manifold seems that people that switch to the victor jr are just getting a little more HP at top end. as far as push rods i have no clue...... was looking for some recomendations here. anyway feel free to critique my combination because im not an expert and im looking for advice. again shooting for 600 on 91-93 octane.

project71nova · #15 Post by **project71nova** » Tue Apr 10, 2007 10:04 pm

what do you think of this cam for the combination ? just the cam not the whole kit.

http://store.summitracing.com/partdetai ... toview=sku

help with 406

help with 406

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