Im looking at doing some engine work here shortly. The motor was rebuilt, but rebuilt to stock specs, and it's not enough for me. I've got my heads picked out (I believe) and my intake as well, but I want some advice on a cam.
Heads: http://www.summitracing.com/parts/DRT-127322/
Inktake: http://www.summitracing.com/parts/EDL-7501/

But what about the cam? I want something rough, really lopey. There's a 69 camaro in my area that has the sound I'm looking for, and it's a mean, mean machine. Any suggestions? I was told the fireball 2, but I don't believe Crane makes that one anymore. I've got a few ideas, but I need help deciding if these are too much cam for the heads and intake that I've chosen, or if it's just too much cam in general. I don't want the car to be tame, or even "streetable", if that makes sense. I just want it to be mean.

1) http://www.summitracing.com/parts/SUM-K1107/
2) http://www.summitracing.com/parts/EDL-7102/
3) http://www.summitracing.com/parts/SUM-K00112/

Feedback would be appreciated. If I'm just doing it all wrong (which I very well may be, I've tried my hand at researching but...) please set me straight! I want this ride to be wild, so all input is helpful. Thanks!

 

Seems like you are picking the large runner heads with a very good dual plane manifold when you might want a single plane or get the smaller runner heads for the dual plane. Did you look at the notes on your cam selection concerning compression and stall speed if using an automatic? What rear end gears do you have?

 

The car is a manual, so I don't need to worry about stall speed. Rear gears are 3.36

Can you explain the dual plane intake with the large runner heads being bad? Thanks!

 

The purpose for a large runner is higher RPM's 6,500 +
The dual plane you chose ends at 6,500.
Large runners mean less HP/torque at lower speeds combined with a 3:36 is not a good match.

 

A single plane would make things worse for you in my opinion. I'm putting new heads on my car soon (patriot 190cc) and will keep the LT-1 intake I have. I'm not sure if the 200cc heads you are looking at are too big or not, if you want to go to 383 later on it's probably a good idea though. This may be helpful, the engine in the video is the same cam as my car, comp 294s, useful comparison of single vs. dual plane intakes on a 360sbc:

http://www.youtube.com/watch?v=i2DvnoHWagk

 

Comp Cams has a new product out. They've named it "Thumpr" and it's designed to accentuate that very sound you're looking for, without compromising driveability.

"Let's face it, nothing grabs our attention at a car show or cruise night more than the hard hitting sound a thumping, high performance idle. Thumpr™ Camshafts deliver that aggressive, head-turning sound like no other cam on the market. Available in hydraulic flat tappet and hydraulic roller camshafts, Thumpr™ Cams are now available for most popular applications, carb and late model efi.

*Available in hydraulic flat tappet, hydraulic roller and retro-fit hydraulic roller designs to fit most popular applications, including both carbureted and late model electronic fuel injection engines

*Variety of kits available to fit any budget and application, including the exclusive "GK" gear drive kit

*Three unique camshaft designs for each engine to fit all cruising and street performance needs
*Designed to provide maximum performance when combined with the latest in valve train components, such as Beehive™ Valve Springs, Ultra Pro Magnum™ Rockers and Magnum™ Pushrods

*Long exhaust duration and other grind characteristics produce a powerful, hard-hitting exhaust note



http://www.compcams.com/Thumpr/index.html

Note: I agree with the others. A dual plane is best for everyday use. A common mistake is going with a single plane intake and a huge carb, just for the numbers. Keep it reasonable and you'll be much happier!

 

My solution :

 

Go with the Dual plane, 180 CC intake runner 64 cc head and this cam. http://www.compperformancegroupstore...y_Code=THMSBC4
If you want a rougher idle than that pull a plug wire off. Then you will have the nasty idle and similar performance to the cams you listed. They are a poor match for your RPM capability, compression and gearing and you would not be happy with any of them.

 

been looking for the suggested components, and here's what I've found. It's the Performer RPM Airgap Dual Plane Intake, a set of Dart 64/180 heads, and the 279/297 cam from Comp Cams.

http://www.summitracing.com/parts/EDL-7501/

http://www.summitracing.com/parts/DRT-127122/

http://www.compperformancegroupstore...y_Code=THMSBC4

Here's a link to the cam on summit with more specs:

http://www.summitracing.com/parts/CCA-CL12-600-4/

What do y'all think?

Also, dumb question of the day; what do I need to do to those heads? Or can I just bolt them on and run it? Thanks in advance.

 

ROTFLMAO
I have been using both Weiand and Edelbrach dual plane intakes for years and have been very happy with them. Honestly I haven't dyno-ed them to see if an open plane would produce more power. They worked well on my 327 & 350 both 030 over in my el caminos. I used H-278-2 in the 327. I bet nobody put that in their engine in years, but it would snap your head back when it kicked in. Those were the days.

The air gap intake is a very good one in my opinion.

 

Use new head bolts with washers not the washer headed bolts like stock. The heads you linked have solid or hydraulic roller springs. These have hydraulic flat tappet springs.
http://www.summitracing.com/parts/DRT-127121/
If the springs match the cam requirements they should be a bolt on. Call Summit and get a closed and open spring pressure and the rate of the spring and compare them to the recommended springs here: http://www.compperformancegroupstore...ct_Code=981-16
The Air gap may not clear your hood.
The thumper cam is ground with a closer LSA = more overlap, a bigger duration on the exhaust = more overlap and the intake centerline is moved earlier to close the intake valve earlier for a lower compression engine. It was designed exactly for what you want to do. It will give up a little power vs the optimal cam for your application but it will have the sound your looking for and correct intake closing point for your compression. You need all the compression you can get. If the pistons are .025 in the hole as I suspect use the Felpro 1094 head gasket. Compromise is always the way

 

Reviving an old thread...

After months, I finally have the money set aside to get the heads, cam and intake.
heads: http://www.summitracing.com/parts/DRT-127121/
intake: http://www.summitracing.com/parts/ed...make/chevrolet
but what about the cam? I was suggested the Comp Cams Thumpr 279, and I enjoy the sound it has, but I would prefer to have the best cam for my application. I'd like to stick to a flat tappet cam, so what type of advertised duration and valve lift should I be looking at? You guys have been such a help, and I truly appreciate it.

Also, I'm currently running obx side pipes, and am going to send my quadrajet to Lars for an overhaul. I was planning on running felpro 1094 head gaskets to increase my CR.

Thanks in advance!
-Damon

 

Forget the performer manifold use an rpm manifold.

It looks like you have a 78 same hood as a 73. I put a high rise single plane tarantula race manifold for its time on a 454 in a 73 with a chevy drop base filter and shut the hood. With a drop base filter you for sure won't have any problem with a SBC.

I'm guessing you have a an l/48 if its still original with uncut deck it had dished pistons and a .018 shim gasket so if you use the .015 1094 felpro your gaining almost nothing in compression other then the change in 64cc chamber volume.

Crowers stock lift rule cam part number 00256 or summits part number for it CRO-00256. 220/226 at .050.
264/278 advertised with a 108 LSA for that rumpity rump rump. Use a 1.6 or 1.65 rocker to increase its .451/453 lift on the valve. This is much better then the sillyness of a 227/241 .050 thumper sillyness mess.

 

350

id run the 180 head the dual plane and the Isky 270 mega cam no bigger
They are old school cams but they work real well
As said youll hear the rump and it will pull nice and hard through the midrange and still sound good on cruise night.
Think there is a point where profiles get too radical you lose control of the valvetrain and destroy these cams. Or the shearing action is just too much. every "extreme" type cam Ive used that was over 220s at 050 FT or roller has gone flat. Good luck with Isky..to each their own.

 

Have been looking for the isky 270 but can't find it anymore at least at summit. www.competitionproducts.com has it part number 201271M cam and lifters. It has one fault being a single pattern.
I like that crower 00256 better its dual pattern. With some higher ratio rockers for more lift added in.

 

Wonder if jegs sells it either
Worked real well in the ones I used it on very surprised at the torque it made.


Crower does make some nice ones too reputable co but I have 0 experience with their flat tappets.

 

I looked at jegs not seeing it. But competition products is good have used them before they have the isky mega most likely the crower to.

If you have used the 270 mega sounds like it works good for what he's trying to do.

Either one is better then the thumper IMO lol. Have used several crowers but no hydraulics. Can't do that juice stuff its against my religion. If you want first rate cranks, rods, rockers or whatever crower is on top of the list to shop at.

 

Well lets here why the thumper is better ? The 227. 050 is getting up there for a 350 trying to pull 3.36s, why is the extreme 14 degrees more exhaust duration needed ?

 

Because the sticker looks cool and the ads are huge.

 

I think they add that much duration for the sound, weird that the exhaust has a lower lift. I figure any thing that is designed for sound skimps on the performance side to get that sound.