mastrdrver

I'm planning on building a 400 that will rev to 6500 to 7000. Will the SuperRam be able to breathe enough to keep up, or will it die off about at 6000. Is a MR/LT1 in order for this setup?

Thanks,
Jeremy

D Stroy H8

The superram will top out around 6,000 but that's not to say you can't port the superram yourself to make it better. The miniram and LT1 have superior topend but aren't emissions legal.

BuckeyeROC

As said by D Stroy H8, the SR will run out of breathe around 6000 rpm. I'd definitely port it on a 400 too. You can have a very streetable car that is easily in the 11's though. If your set on revving to 6500-7000, you will need a MR/LT1 or maybe a Stealth Ram.

jeffsbluez

Why do you need to turn the motor that much? Do you race? The SuperRam will peak around 6500 RPM with a ton of port work and a killer set of heads on that size of motor. Good luck!

D Stroy H8

Yes but who the hell wants to pay 1100 bucks for a superram and then have to put time into porting it? I say if emissions aren't a concern to you, go with the stealthram. It's very budget minded and a real bastard of an intake.

jeffsbluez

I totally agree with D Stroy H8. I myself am getting a stealth ram! It looks to be much easier to work on.

HyperSpeed

If look at the original design of the SuperRam by Lingenfelter, the intake is all about mid-range torque. Most of his designs used matched setups to peak torque in the midrange and top out HP in the upper 5000's (basically this would be the most optimum on a heavy street driven third gen). Look at his 383 L98 with a midrange cam, ported aluminum Corvette heads, 1 3/4" headers, 58mm thottle body, and a stock SuperRam base/plenum. The torque peaks at 4500 RPM with 481 ft-lbs and his horsepower is at its max at 5250 RPM with 442 hp. Matching parts is the most important part. If you want top end hp, get an LT1 type intake like the MiniRam, a larger duration cam and some better flowing heads.
Bottom line is this: If you consider many factors, the SuperRam is the most streetable from all of the dyno numbers I have run across. With a heavy car like our Camaros and Firebirds, we need that low-midrange torque to get us going.
Whatever you do, good luck.

IROCZZ3

7000 rpm on a 400? Carb intake converted to EFI would be my choice. When it's all said and done you probably would've spent as much as a Miniram. But IMO if you're doing a high rpm 400, price won't be a concern anymore so why skimp on the intake selection?

Ragtop89

My S-Rammed 355 has seen 6800 several times with no probs.

It is ported to match the big mouth manifold.

You can hear it here - http://www.lastgen.com/videos/RagtopsRide.avi

Hopefully the link still works.

A friend is hosting it for me.

I rap out the car to just under 7000 rpms several times in the vid.

D Stroy H8

Right - you portmatched it. He was asking in terms of "out of the box". Like I said - I would not buy an 1100.00 intake and then port it for performance... just seems like I could have focused funds elsewhere if I found myself in that situation. Once again - if emissions wasn't a concern I'd ditch my plans to make a "hi-flowing ltr setup" and buy a stealthram in two heartbeats! It screams value.

D Stroy H8

Hmmm, you might look into an EFI adapatation project on a carb manifold...

https://www.thirdgen.org/techbb2/sho...61#post1161961

I asked how high it would rev and I imagine, well, pretty high.

Ragtop89

Actually, I bought it used.

You're right - I would not buy an $1100 intake and then port it for performance. That's nuts!

I bought the ported $1100 intake for $300 from a guy that wrecked his IROC.

Made perfect sense to me!

xformula79

7000 rpm on a 400 sounds a little wild. The bore/stoke ratio of a 400 makes it a perfect street engine to maximize torque in the low end and hp up to 6000. I wouldn't really want to spin a 400 to 7 grand simply to avoid piston side-loading which will decrease the lifespan of an engine (or at least piston rings). If you are dead set on achieving 7000 rpm, put a 350 crank, 5.7" rods, and custom pistons in that 400 block to make a higher winding 377.

'87FAKE-IROC-Z

Are you saying that you're pulling at that rpm. I too have spun my SR 357 up in the 7000 range (accidentally), and I assure you that just because it spun that high, it is not making power there.
Mine is port matched also with ported runners, that doesn't make it pull to 7k.

If you want 7000 rpm on any engine, the SR is not your prime candidate when compared to the others that are designed for that range.

D Stroy H8

What about the damn Carb manifold to EFI conversion? Noone said anything yet, I think that'd be a good idea. Then again, everyone is right - why are you looking to spin a 400 to 7k? Sounds like a project an eccentrist with alot of bucks would do to me. I'd be fine with a 400 that spun to 5500rpm, and plus it'll last longer.

mastrdrver

I will be shifting at 6500 to 7000, don't know about the cam yet, I was just looking at my options to match the intake to the cam. Don't want to end up with a cam that would make me shift at 6500, but a intake that wouldnt let the motor breathe to those levels. I was looking at a 242/248 or 248/254 HR XE on a 400 so that was why I was asking.

aziroc

r u making ur powerband go past 5500 rpms ie u make 400 hp at 6500 rpms? if so y noy just get a damn s2000 that goes to 9k? 400's werent made to go really high in RPMS.

xformula79

Back to the topic... carb manifold to efi conversion probably a big waste of money when you can buy out of the box kits that have everything already and probably will look a hell of a lot better than some custom make-shift setup.

D Stroy H8

Right I inquired earlier in a diff. post how much one of those kits cost. If hes looking to spin to 7,000 (once again I must voice my disapproval on this crazy idea) then that would be a good choice. The best of both worlds, EFIs efficiency and a Carbs virtually limitless top-end!

RedFirebird

If you want a carb-style EFI manifold, get the accel pro-ram manifold. It already has the injector bungs, fuel rail provisions, etc etc......

OMINOUS_87

7000rpm is pretty lofty rpm for any big cube small block, that is HITHERE pretty expensive range to build into. Before intake manifolds are compared HITHERE set of heads need to be chosen and the bottom line is they better be big, like 210 or more. With set of heads that big your gonna need some serious cam like the earlier mentioned 242/248 or 248/254, but you need to get that silly HR notion off the table as the valves are gonna float like crazy above 6200rpm. Now getting to the intake, it doesnt matter what gets the nod as it will have to be ported to match those bigass heads. About the SR, no way, it doesnt matter how much you hog it out it will peak HP at 6000rpm or less on HITHERE 406 no matter what the head and cam combo is. HITHERE would vote for HITHERE converted Victor Jr or Team G, they are proven to make power in that range with big cubes.

My .02