Anybody running the '68 4 speed 340 cam?

RustyRatRod said

Low cylinder pressure is what he means. That's why the suggestion for the compression test.

Click to expand...

This is from an old thread about the cam in discussion. The intake closing is 10* later than the Comp 268H bleeding cylinder pressure (dynamic compression) off...


"I worked with another member here and we sent one of my cams that was custom ground to be a clone of the 68 340 4-speed cam to Ken Heard at Oregon Cams and they measured it so they can duplicate it and now have it available for sale."

Here are the Oregon Cam specs/details:

#2120

221/227 @ .050”, 276/286 adv, .438”/.456” lift, 114 sep


Per the 68 Plymouth service manual, the factory specs are:

276/284 dur, .444"/.453" lift

Int op = 26° BTC
Int cl = 70° ABC
Exh op = 78° BBC
Exh cl = 26° ATC

From calculations:

Intake centerline = 112° ATC
Exhaust centerline = 116 BTC
Lobe separation = 114°

Comp 268H specs: