My streeter has hit 7000 thousands of times since I built it in 1999, without the crossover; jus saying.
Streeters with 3.55s,on the way to 65mph, are only revved out for a second and change, and ending at ~5700@85mph in second gear. With street suspension, most of the time yur gonna burn right thru first gear anyway so you might as well short-shift into second..It would take a heck of a cam to want to spin 7000, often.
I must admit tho, that hearing my 367 screaming thru dual 3s at 7000, is rather addictive, so I do it every chance I get.
I did, however, do all the other mods, plus a HV pump to help cool my topend, and a road-race pan,for a modicum of aeration control and possibly some extra cooling.
The most important thing, IMO, is to keep air out of the oil circuit, especially to the rods. I lost two 340engines before starting with oiling mods. On one it was the #1 rod bearing, and the second was #3, go figure. Both times the factory oil level was a little low. Both times the rpm was under 6000. I was just out joy-riding.
When restricting oil to the topend, keep in mind that the rocker shafts only get oil every second crank revolution, and they only get oil for a few degrees of cam rotation. The oil that pisses out everywhere up top, after lubing your rocker arms, is what cools your valvesprings, and those 16 buggers are some very hard-working boys. I did the reverse, and tried to supply more oil to the top. My Hughes springs have over 80,000 miles on them, and the last time the engine was freshened was in 2004.
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For a 340/360 (I can't speak to others)
to properly use a shift-rpm of 7000, you would probably select a cam to peak at 6000 or a lil more. so, yur looking at 255*@.050 or more. The Mopar 292 peaks at about 5700, give or take, and IIRC is 249*@.050. That's one heck of a street-cam, even for a 360. I yanked it after the first summer. With iron heads, it wants something like a 3200 hi-stall, and more than 3.91s.
With my A833, that cam was OK with 4.30/4.10s but that put a serious damper on hiway cruising. An automatic with a hi-stall might get away with 4.10/3.91s. But all of those suck when kicked down into First at 32mph. In an automatic streeter, IMO, 3.55s to 3.73s,are the right gear because@32mph; 3.55s will get you ~3600 in first gear and 3.73s will get you ~3800. These are right around peak torque with a typical ~228@.050 cam, and the tires will instantly light up; let 'er rip. You'll need some traction control,lol.
BTW, for a car equipped with 3.55s and an A833; 32mph is 2710 in second,3750 in first. With a 3.09 deep-low, it is 4360..... lots of choices, none of which normally lead to 7000 rpm. Unless, like me, you just crave it,lol.
And finally
With a 904/3.55s you could hit 60@6800..... at the top of first gear; I like it.
My combo hits it at 6380 in first-over.
