again 273 wanna hear your opinions ...

Talking about solid lifter cams,Here is why I said that I would get one; The solids have faster rate clearance ramps. This allows you to install one size bigger cam, without the cylinder pressure loss, usually associated with that amount of.050 duration
Another way to look at it is;with the same advertised,you can have the next larger sized .050

Here is an example, purely hypothetical;
a 262/268/110 cam, might have, as a
FTH ,216/[email protected]. But same cam as a solid, might have
Solid 224/229.. That's a difference of 8/7,
and one cam size is generally considered to be 7*
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Now from the other side, if you wanted a 216/222 cam, a FTH might be 262/268. But the solid might be 255/261, again 1 size difference. Now, because the ..050s are same, they make very similar absolute power. But the advertised numbers will affect the idle, the fuel consumption,and the Part Throttle performance.

To get a sense of that 262 vs 255, let's install these two, in the same 273 with no other changes, again at split-overlap, and lets make them 110LSAs. And I'm just gonna capture the important numbers from the Wallace Calculator, as; Scr/Dcr/Psi/VP.
>So with the FTH, I get;
8.0/6.62/125/82 This would be very weak.But with more Scr, I get
9.6/7.90/157/104 And still more
9.9/8.14/163/108 Here the pressure is maxed out for 95Ron, and you might have to run 98 for WOT work. So this is as good as it gets with a FTH.
> Next ,the solid; I get;
8.0/6.79/129/88 Again , weak, but better than with the FTH
9.6/8.11/163/111 About as good as it gets
9.9/8.36/169/115 Too much pressure now,for available fuel!
So now look at the Scrs, where the pressure is maxed out at 163psi. Notice the numbers are 9.9 for the FTH and 9.6 for the Solid.
If your 273 came in at 9.6Scr, and you installed the FTH, you would be sacrificing 6psi and more importantly 111/104= a loss of 6.7% in VP, and that's a heavy loss for a 273.
But if your Scr came in at 9.9 you couldn't even run an
equivalent-at-.050 solid, because the pressure would be too high.
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Ok so lets say you have decided that a solid is the way to go. Let's talk about LSA. Say you like the 216/222 cam. You could theoretically get that on any LSA from about 115 down to 102. That's about 2 cam sizes or peak power difference of 400rpm.But let's see what happens to the pressure. Again at split-overlaps.

The solid, above, was a 110, as were all of those,so copy/paste
9.6/8.11/163/111 About as good as it gets
9.6/7.85/156/102 This is at 115LSA, and
9.6/8.50/173/124 this is at 102LSA
Notice that all are at 9.6Scr. But look at the pressure differences from 156 to 173. So you can see that the pressure needs to be sorted out for each cam. Notice also the VPs from 102 to 124! that would be the difference from a loser combo at 102, to barn stormer at 124.
So lets reset the pressures to about 163 and see what happens., I get
9.9/8.09/162/106 with the 115...................loser, but mellow for Mrs.Red
9.6/8.11/163/111 About as good as it gets, and
9.2/8.15/164/118 with the 102...............winner for you
Check it out, 118 is now 3 units higher than the stock 273 with the optimized cylinder pressure, So finally the bottom end is now at least no weaker than stock. But the power has moved way up in the rev range, to make use of those 3.91s and the OVERLAP has increased from 20* with the 240/112 cam, all the way to 54* with this 255/102 cam.

but wait, the VP is now 3 units higher. Hmmmmmmmm, you could move up one more cam size, and top up the Scr and .......oh never mind lol, it's for Mrs.Red......right? lol
Ok wait, I had to see
9.3/8.16/164/117, This with 258/264/102 in at 101, and now 57* of overlap, so power peak moved up again a wee bit.And with the Rpm came a few more ponies.
but wait, the VP is still greater than 115,the stock optimized 273. Hmmmmm
9.25/8.12/163/116, with a 262/268/102 in at 101,for 61* of o/lap,and more rpm
Oh, Gee, room for one more,lol
9.55/8.17/164/113,with a 266/272/102, in at 101, for 65* O/lap, and more rpm
Doh,
Plug that into your desk-top dyno! woodgha