I am building a 408 for my '69, and need some help with the intake choice. Here's the grocery list so far:
*Forged crank
*Forged rods (5.7")
*SRP pistons
*274 Comp Extreme Energy camshaft
*Dart Iron Eagle Heads - 64cc combustion chambers, 2.02/1.60 valves, and 200cc intake runners.
*Barry Grant 750cfm double pumper Demon Carb

Tranny is an M-21, and rearend gears are 3:73. Car will be driven once or twice a week, mostly street. I am looking for the most bang for my buck. The intake I had on my 355 in this car was the Weiand Team G single plane with a 1" 4 hole spacer. Initially, I was going to re-use this setup, but I am not convinced that this is the best way to go. I have seen similar buildups done and they almost always choose a dual plane intake, like maybe the Edelbrock Air Gap RPM.

What do you guys think???? Thanks for the input.

i like the team g, its a real good manifold. im using a 1" open spacer on mine. w/ the torque that motor will make, a single plane, like youre team g or a victor is not a bad choice, imo. w/ the cam and description of youre goals, are you sure a forged crank is a neccesary expense? a good cast steel crank is good to 500 horse, easy. just a thought.

68RS406, you're absolutely right, I did'nt have to, but I kind of went overkill with the bottom end just so I won't have to worry about anything. What it is actually is a Competition Series shortblock from Wheeler Motorsports in Florida.
Thanks for the reply. By the way, what cam do you have in your 406?

[This message has been edited by 1NAST69 (edited 03-20-2002).]

hey thats a good stout bottom end, i would have liked to go forged crank, but just could'nt fit it in my budget, it's really nice to have that kind of insurance. my car is strictly for fun, although i drive it often, but the strip is a concern w/ my set up. i went w/ an isky solid roller 250 at .050 duration and .608 lift, w/ 1.6 roller rockers, .580 w/ .028 recomended lash. w/ an 108 lsa. its a pretty nasty cam, but all the cubic inches seem to like it that way, and i've got a 3500 stall to go w/ it. when i was shopping for cams, the guy who does my machine work (builds a ton of 406's, circle track and drag) said a 406 that does street and strip duty really likes a cam w/ 250 at .050 duration. of course thats w/ a solid roller, but a flat tappet cam in that neighborhood( 240-250 ) would probably be the same deal. i like rollers because you can get more lift than w/ a similar duration flat tappet cam. a buddy of mine has a 406 in his chevyII w/ a solid roller thats 260 at .050, and 106 lsa, and its pretty nasty, but still idles around 850 rpm, and has enough vacuum for power brakes. w/ you're cam i'll bet its a real nice driver, w/ a little lope to it, and plenty of horespower and the torque will slam you into you're seat, which is nice http://www.camaros.net/forum/smile.gif

hey look into the dart single plane intake, they are more money but they are more for a reason, they make more power, check them out i have a single plane on my 454, just my thought
Jake

My opinon: Stay with the Team G.

Good idea on the overkill, now if you decide to use some nitrous later you have the bottum end to handle it. I think you should go with a single plain for sure, arent they all about the same? The performance between one single plain and another cant be all that different can it? Any dyno comparisons on record somewhere on the net?

there are HUGE DIFFERANCES in the power differant single plane intakes make!! we gained 46hp at 3000rpm 40hp at 4000rpm and 35hp at 5000rpm swapping from an OFFENHOUSER 360 DEG single plane intake to a #2904 single plane edelbrock intake on the last 468cid oval port engine my friends camaro had when it was on the dyno and he payed for extra dyno time just to swap intakes to find out!(he used a 750cfm vacume secondary holley carb BTW)

I would go with the Edelbrock RPM Air-Gap manifold. Makes best power from 1500-6500 RPM.

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The race...The smoke...The rush!
The man...The machine...The engine!

68RS406, my cam is a little milder than yours, 230/236@.050, lift is .487/.490, 110 lobe centers. The interesting part is that when I ran this cam and the next step up, which is 240/246@.050,on my desktop dyno, the smaller cam made more power. I also was recommended by Dart to go with this cam, the tech guy told me they had done a buildup with the same heads that I purchased from them on a 406 and it was real strong. As far as the Desktop Dyno goes, I think that the numbers are a little unrealistic, but the overall power seemed better with this setup. Ithink I'll try it out and maybe next year step up to a Hyd roller. Thanks for the replies.

[This message has been edited by 1NAST69 (edited 03-20-2002).]

You could go either way on the intake IMO either single or dual plane. Since you'll be mostly on the street and have a manual trans I'd stay stick with the dual plane.

I could have gone either way with my 383 (and did) and found that the car ET'd about 1/10th faster with the single plane. I have slightly more cam (Comp 282s) and a 3000 rpm stall and a slightly smaller engine.

My first pick is the RPM Air Gap (has a notched plenum divider for a couple extra RPM) with a 1" open spacer. My second pick would be the Vic Jr with a 1" open spacer.

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68 Camaro, 383 small block with TH350 trans. 11.98's at 111mph and never trailered.

this very topic is being disscused at the team chevelle site now with posted results

if you have the team G, use it. it can be replaced later if you feel the need. use the money you save by re-using it and get a real, proven 50 HP gain- chrome valve covers and timing cover. you won't regret it..

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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels. 12" Corvette brakes on the way.
see pics here http://community.webshots.com/user/novaderrik

1nast69, im sure that cam is going to perform great for you. i think the fact that mines a solid roller allows for a little higher duration at .050 number. i know my machinist has dyno'd quite a few 406's like mine and he reccomended a solid roller in that range, and he knows how i drive it, he's one of our racing buddies http://www.camaros.net/forum/biggrin.gif. the only way ill know is when i run it this year, tracks set to open real soon, but theres freakin' snow on the ground right now! let us know how it all works out for you.

Novaderrick, I got those already, what I'm working on now is the oil cap that's shaped like the top of a piston, now there's a real power gain!!!!!!! http://www.camaros.net/forum/biggrin.gif
68rs406, Sounds great, I hope it gives you the results you're looking for. As for the snow, we don't have that problem down here http://www.camaros.net/forum/cool.gif I'll be sure to post some pics and comments on my combo once I get it all back together. I did what we all do, started with one project on the car and ended up doing fifty other things to it.
Thanks for the info.

[This message has been edited by 1NAST69 (edited 03-21-2002).]

I recently swapped my RPM manifold for a VicJr on my daily driver 406. Haven't been to the track yet with the new manifold, but I haven't noticed any difference in driveability. I have a mild motor, 224° cam and a Q-jet, so I'm not expecting to gain a whole lot, if any.

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1967 Nova coupe daily driver
406, 10:1, 224° cam, Q-jet, 700R4, 3465# w/driver
11.76 @ 116 thru the mufflers
18 mpg on the road

First off induction is a very important part of the engine. If you don't make frequent visits from 3,500-7,500 rpm then what do you need a single plane manifold? An off idle torque and throttle response would be nominal. your could use a performer RPm good from idle to 5500 but yes I would use the air gap and have the power range desired. When are you honestly going to take that motor high than 6,500? You could use a dual plane with a carb spacer to slow the intake speed a little or get one that has spread bores and get a better carb signal. You could always machine a dual to be more like a single but why not just buy the air gap? Man it is up to you, but listen to your combo but not what other people say they had luck with. Any good motor builder will telll you motors are built different. The goal is to make everything in your motor work together efficiently and were they all compliment each other. Good Luck.

Good advice Deimos, thanks.