Hypothetical build questions…

vntned said

So looking through my cam stash, aside from a few big mechanicals, I have:

An oldskool Mopar Purple cam
#P4452761AE
Lift is .450/.455
Dur. Adv. is 268/272
@0.050 228/231
110 Lsa
1500-5800rpm

Or a Comp Cams Nostalgia Plus
#CL20-671-4
Lift is .484/.484
Dur. Adv. 284/291
@0.050 239/246
108Lsa
2500-6400rpm

Not gonna lie, that Comp will make 30hp over that old MP, and that is tempting…

Click to expand...

While the Comp may make more HP, the drive anywhere aspect you’re looking for is ether the MP cam or a new cam all together. The low first gear trans will like 3.23’s (IMO) at the most. In overdrive, the ratio drops to the low 2.xx. If you use 3.55’s, use a tall tire. In OD, it’ll be a hair above 2.50 final drive.

The OD gear boxes are best used as intended. In drivers. AKA small cam cars traveling far. Not to big of a camshaft since there operating ranges can quickly be in a range above the final drives cruise range. You’re going to have to work out your final gear ratio drive and tire size for the cruise rpm for a camshaft duration that will work well. If the cam is to large rod the final cruise rpm between the tire size and gear ratio, the engine will become less efficient and may use more fuel than intended.

Do you know what the head flows?

Nice car, always wanted one of those.