tunnel ram vs. NOS on a 351C 4V

Witht that Cam, I dont think that you are gonna be able to pull to 7000 RPMs. May have to go to a bigger stick for that [img]/phpBB/images/smiles/icon_frown.gif[/img] Also, I dont think that you will get 18 MPG on your cleveland...brand new my 351 C 4v did not get better then 200 Miles a tank (19.5 gal tank) Parents have both told me this.

Not knocking you or your combo!!! just trying to help!!!

Jeff Given
[addsig]

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I aleady have the Performer, and it's like the thing has a governor on it. I would like to get 7000 RPM's out of her, but don't want to kill my low end torque. I have hydrolic lifters, and the spec card for the cam reads;

cam lift- int .281 exh .296 valve lift- int .486 exh .512
lobe ctr- int 106 exh 118 SAE duration-282 int 292 exh .050 duration- 204 int 214 exh

maybe you guys can tell me what these #'s mean. It doesn't lop like a heavy cam, but it does run good. it is an RV.

so, how can I get this Blue Thunder? does Probe Ind. have a web site?

2 Q's, what cam is this? and whare to find blue thunder?
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The first thing that you should consider if you want to spin your engine to 7000 RPM is getting a solid lifter cam. Hydraulic cams can be made to spin to 7000 but the tappet deceleration rates of the lobes themselves have to be mild and the valve train components quite light. A solid will make more power everywhere in the powerband and will make more vacuum and fuel economy than an equivalently sized hydraulic cam will as well. The cam that you described is very small. It's even smaller than the 1972 266HP factory 351CJ cam. I'd recommend something like the Ultradyne 272/282 solid for your engine. It's advertised as being very streetable, idles with a slight lope and makes power from 2800 - 7000 RPM. You'll definetly know you have a cam in there and the low end torque won't be what it was with the little cam but it's the minimum you need to make good power to 7000 RPM.
Yes, Probe Industries has a website. Believe it or not it's:

http://www.probeindustries.com/

I do like the bigger cam idea, I'll check into the Ultradyne or a cam simular to your sugested lift.

As far as the Blue Thunder, I gave Probe a call, and they recamended I go with a Weiand Stealth. Due to the fact it has an open plenum as opposed to a dual. I don't know that much about the differance, and the guy was kinda veague. He even recamended getting it from Summit.
It does need to be streetable (daily driver) but with a new cam and the 750 with either intake should be a big plus++++++++

What's your take on the Weiand vs. the Blue Thunder?

thanks for all your inputs

The vague guy must have been sniffing glue or something. Weiand Stealth intakes are dual plane manifolds as well, just like the Blue Thunder. However, they don't even make a Stealth intake for a 9.2 deck height Cleveland. All they make is the Weiand Accelerator single plane, which from the dyno tests I've seen on them work reasonable well if you don't need torque under about 3200 RPM. If you decide not to run a Blue Thunder intake my choice would be the Edelbrock Torker.
Remember though, if you decide to run a bigger solid cam, you'll have to get compatible valve springs and you'll have to make the valvetrain adjustable so you can set the lash. Crane makes a kit that'll work as long as you don't choose valve springs that are up over about 330 lbs at full lift.

<font size=-1>[ This Message was edited by: mach1morgan on 2/28/02 10:33am ]</font>

I'm going to want that low end torque, I'm thinking asking for 7000rpm in a daily driver is to much. In Summit (re; Torker) they even say not recamended for a daily driver, no low end. That could also be to much cam,[img]/phpBB/images/smiles/icon_confused.gif[/img][img]/phpBB/images/smiles/icon_evil.gif[/img][img]/phpBB/images/smiles/icon_confused.gif[/img] now what????

the cam I have is to mellow, a solid lifter might be to wild, if I could find a happy medium and run that blue thunder, would I have a streetable ride. or????

I'm looking for a good combo that is street able, and eats Corvets. is that to much to ask?

My understanding is the Holley Strip Dominator intake for the cleveland is to be re-released here in a few months. I would conside that over the tunnel ram for a serious hi rpm combo.
[addsig]

A lot of this depends on what you consider streetable. For different people it means different things. I ran that Ultradyne cam through my Engine Analyzer and it predicted 10.5 inches of idle vacuum. Being that it's a solid cam 238 degrees isn't really that much, plus it's ground on a 112 lobe seperation which will make easier to live with. It's hard to find a solid smaller than that but if 7000 RPM is you goal a solid cam is almost a neccesity. I would call that cam streetable, but I also consider 3000 stalls and Torker manifolds streetable too. That cam with either a Blue Thunder or a Torker intake should make over 400HP if you have a good exhaust system behind it, definetly enough to do in most vettes.

the stall I have in the C6 is 2300-2600 with a B&amp;M kit, and the exhaust I'm running headers down to 2 1/2" duals straight back, and just bought flowmaster 2 chambers. when the time comes to hang the exaust back up I might have them put an "X" before the mufflers. I know the 2.5" is boarder line but will have to do for now.

when the time comes, for the change over, I'll think seriously about the combo you sugested, it sound good to me as long as I can idle and have vacuum....


thanks for all your input.[img]/phpBB/images/smiles/icon_cool.gif[/img][img]/phpBB/images/smiles/icon_smile.gif[/img][img]/phpBB/images/smiles/icon_cool.gif[/img]