cam advice for 340 street motor
Hi I'm looking at cams for a 340 I'm building for my 72 duster. Will have 323 gears and I'm willing to put a 2500 or so stall in when the motor is out. I don't want a crazy race car idle but i would like a nice lope to it but something still drivable. Does not have power brakes i put Kelsey hayes 4 pistons in the front. Motor is a 69 340 bored 40 over and i have 1970 U heads with 2.02 intakes just gonna have gone through maybe port match the intake. Suggestions?
I think we are losing sight of the OPs request;
It will have 3.23s.
Willing to put a 2500 or so stall
Krenzy wants to run 3.23s and a regular TC, common, stay on target
>The later your ICA is the more compression you need to run to keep the low-rpm torque up. Failing that you will need to get a TC ever higher, and the 3.23s will be long gone, as will be fuel economy.
>The more overlap you have the lopier the idle, and the more fuel goes out the tailpipe around town
Those are big sacrifices just to hear the big-cam lope.
But sure; long period cams with lots of overlap,release the engines ability to operate at higher rpms, and that is how they make more power...... always at the sacrifice of low-rpm power. It's always a trade. But to get to those higher rpms where the power is...... for a streeter, requires ever bigger rear gears and ever higher stalls.
A cam that peaks at 5200, using 3.23s comes to the peak at about 50mph in first gear. It doesn't even get on the pipe until about 35/40 mph.
Krenzy wants to run 3.23s and a regular TC
Krenzy needs torque to get him up there, cuz he only has a 7.91 starter gear.
Back to post #2
The factory 1969 340 727 TC was rated at 2350 +/-100,behind the factory stock 340, per my FSM. I cannot say further cuz all my 340s have been in stickcar As.
