Dual valve springs stock on 2.02 915 J Heads?

Dual valve springs stock on 2.02 915 J Heads?

Marcohotrod said
use the stock 340 retainers and measure the installed height. mopar said it was 1 11/16" = 1.687, after a valve job figure 1.700. the howards cam is good, a lil more than a 340 cam, a single spring with damper is it, around 110-120 seat and 300 open-what does howards suggest for spring loads?

Howards has a single and their specs are

OD: 1.445 in.

ID: 1.040 in.

Seat Load: 120 lbs. at 1.680 in.

Open Load: 295 lbs. at 1.175 in.

Coil Bind Height: 1.100 in.

Rate: 350 lbs.

Coil bind looks a bit better with these. Called them and they seem to think the singles would work just fine.