Don't understand cams
Ok so here is some of the more valuable post from the OP!
Is this cam good to use in a 72- 340 with factory style rockers, lifters and push rods ?
Also, will this make my engine have a real lumpy idle ?
Sorry for a stupid question, but I've never understood camshaft, lifts and durations.
What would factory specs be for a 1972- 340 engine?
View attachment 1714985708
My car right now has a 340 out of a 1970,that is 30 over, with a street thumper cam, J heads with 2.02 intake and 1.94 exhaust valves, an RPM, Dual plane intake and a 600 Holley. The trans is a 727, with a B&M 2800 Stall torque and a reverse valve body. The limited slip rear has 355s.
I bought the numbers matching 340 engine and would like to rebuild it to stock, install it back in the car, but not change anything else. This why I'm trying to match a cam to stock specs.
I really like the car the way that I, have it now, plenty of get up and go. However I want to drive it across Canada and back next year, about 6000-7000 kms or about 4500-5000 miles. Right now I'm getting 6 miles to a US. gallon. So build a factory spec engine and hopefully get 14-15 miles to a US. gallon.
So first let's lay out what OP Has and Wants!
Stock 72 340 eng(low compression) stock except for over bore and cam.
Quote:
My car right now has a 340 out of a 1970,that is 30 over, with a Street thumper cam, J heads with 2.02 intake and 1.94 exhaust valves, an RPM, Dual plane intake and a 600 Holley. The trans is a 727, with a B&M 2800 Stall torque and a reverse valve body. The limited slip rear has 355s.
That took over 90 post to get out of you. Sooo compression is around 8.8-9.4 depending on what piston are in there.
Now you can't have you cake and eat it too. (a GV would help! $$$$) but here i go!
Fuel economy. The mother F'ing cam (street thumper cam) is just a pretend cam and does nothing for fuel economy.(pretends to be a big cam but don't get the milage of a smaller cam that it is!) Get a cam that idles smooth as glass(talk to a cam company) get rid of the 3.55s for 2.76s and i would keep the converter, but a tighter one would help milage.
Power............ You said, you like the power you have but needs more than 6 mile to the gal
keep converter, keep gears buy a "torque cam" (Talk to cam manufacture)
And then you will need to learn how to" tune it" to get the gas milage. I say this because the combo that you have, "tuned", would get better milage then 6 mpg!!!!
Fuel Economy cam.....
10200700LK
Power cam...............
10200701LK
If you hadn't put the long trip, with the milage i would have recommended this cam. but it would have required a valve spring change and spring retainer to guide checked/clearanced......at this point you might as well put guides, valves, exc. Aks rebuild the cyl head!($$$)
Most power for you combo in my opinion.
Power +....................
10200703LK
O, and i'm sure you're exhaust valve is not a 1.94(translation, it's 1.60 exh valve)
HERE IS THE LINK SO YOU CAN READ UP ON THE SPEC'S OF EACH CAM, THE SAME WAY AS I HAVE.
Voodoo - Hydraulic Flat Tappet - Lunati Power
