273 solid Crower cam opinions

273 solid Crower cam opinions

Hey, check out that '759
Notice that it goes from advertised to .050 PDQ. From 260 to 221.That's just 39 degrees, and about the fastest hydraulic I've seen. That would be pretty good if it had more lift. With 1.6 arms that would be .459/.480; not too bad.This cam comes in at 44* overlap and a ICA of 56*@106installed. This would be a lot smaller (about 3 sizes-advertised/1.5 sizes-net) than the earlier one mentioned; with 59* overlap and a 67*[email protected] smaller cam will build significantly more cylinder pressure and thus significantly more low-end torque. This smaller cam has about 12% more degrees of power extraction too, making it much more economy oriented. It won't compete on the big-end tho.
Notice that the Crower goes from an advertised 278 to [email protected]. That's 49* on the lash-ramps. This is more typical.The .446/.456 lift compares well to the '759 with 1.6 arms. There is no smooth in that Crower.
The bigger Crower cam will idle pretty lumpy tho, as compared to the '759 which should have been real "smooth",.....so, I'm confused how you are using the word "smoother".
Let's stack them up;
Crower;..278/288 (net 229/229)/112LDA/.446/.456 (1.5 arms)/67*ICA/44*o/lap
'759.......260/268 (net 221/228)/110LDA/.459/.480 (1.6 arms)/56*ICA/59*o/lap

IMHO the '759 would be better suited to the 273, IF, the compression ratios favor it.It will idle way smoother, make more cylinder pressure, and more torque off the line, do really good in the midrange, and if delayed a few degrees, might surprise you on the top, with good valvesprings, all-the-while getting better fuel economy. The 1.6 arms will boost the durations a bit too, bringing it closer to the Crower specs, without the lumpy idle. The nets might be closer to 1 cam-size different.
Don't let the smooth idle fool you.

FWIW
I ran a 223/230 net cam in my 360 for about 2 or 3 years. That was a fabulous cam. So smooth it didn't scare anybody. Until the hammer fell! Went 12.6/106 with a 750DP, and got up to 32mpgUS with a 600VS and overdrive. Fabulous I tell you.