KennyRain

I have a stock 78 rocket 350. Just wondering if any of you guys know any mild cams that could give me a little choppy/thumpy idle... Thanks

captjim

You do not have enough compression to go very aggressive on the cam, IMO. Any cam big enough to "Thump" will probably make the car a dog. Something in the .450/205 neighborhood would be an upgrade, but it will still sound fairly stock.

KennyRain

What are some good ways to up the compression and where in the world can I find these parts?

cutlassefi

Ahh actually Jim if you put in a single pattern with small duration on a tight lobe sep you'll get good throttle response, maybe a little tone and it shouldn't be a dog. However it will run out of steam on the other end, but it can be done.

KennyRain

Where can I find a cam like that? Everyone says the thumpr cam is excellent... But these are goof ***** with no idea what's going on

cutlassefi

Hey Kenny,

I can grind you one. Even the smallest Thump'r has too much duration for that compression ratio but the lobe sep is right.

I'd do something around a 210 or so on a 106ish lobe sep, you'll hear it a little and have decent throttle response, as long as everything else is o.k.

KennyRain

Custom cam would be great.. Bet your about to charge me a kidney.. Lol

cutlassefi

No, $265.00 shipped anywhere in the U.S. with lifters.

captjim

I dunno.... 210 on a 106 with around 8 to 1 Cr? You know more about cams than I do, but with that Cr and 3A heads, IMO he is pi$$ing up a rope. Bolt on some older 350 heads, bump Cr up into the high 8s, sure.

KennyRain

Pm me a number our a site you work through :-)

KennyRain

What the hell does IMO meen?

KennyRain

And I have 5 heads

firefrost gold

IMO " In my opinion" text Bs "Bull ****" By the way mark who has the best cam stickers?

svnt442

#5 heads are 68-69 heads. What is the casting number on the shelf behind the water pump?

cutlassefi

Pm'd you.

cutlassefi

I agree, he may be pissing up a rope but that's his call. Swapping to the #5 heads would certainly help make it all worth while.

I'd probably do a 106+4 and following the general rule of thumb;
The tight lobe sep will build pressure down low(106). Along with that the early intake closing (106+4 means in on a 102 intake centerline) will help do the same.
Now you add some overlap from the tight lobe sep and you get a little tone. Keep the lift in check to assist in the velocity of the incoming charge and there you go. Will it sound like a 10.0:1 455 with a big roller? Of course not, but it should have an increase in low end torque and overall power.

Hope this helps.

70 350 Cutlass S

I just tore down my '70 Rocket 350, planning to stroke the crank to 3.5, bore about .098 over. I am interested in a custom CAM to go along with this set-up. I have the original heads on it, adding headers, port & polish heads and intake manifold.
What would you do for a cam?

oldcutlass

You would have better luck starting your own thread and PM'ing him directly.