The 360
with KB107s and 63cc heads falls together with the Scr around 10.7.
With iron heads on the street,
you will have to run a fairly late Ica to keep it out of detonation.
But with alloys, you can run a stump-puller cam of about
[email protected]. Even if it only makes 335 hp, it will go 12.9 on street tires with 3.55s and an A833, at 3650 pounds........... Ok well mine did; with 60fts solidly in the 2.2s
Oh and it will get fantastic fuel-mileage.
Part of the secret is that with alloy heads, you can actually give the engine the low-rpm timing it wants, so it takes off like an iron-headed BB, hence the 2.2 60fts. Mine, they say, never stops spinning street tires in the EighthMile.
The thing is, with those alloy heads, 10.7 is nothing to them, producing pressure in the very hi 170s.
For a while, I ran that 223 cam at 11.3Scr with pressure close to 200 on my gauge.... and it did it on 87E10 all day long.... at 32* Power-Timing, delayed to 3400rpm.
I won't tell you that this combo got 32mpg with a 1.97Final Drive, and a dedicated hi-way carb, cuz nobody believes it. So you didn't hear that from me, lol.
As a street-combo, that was the best , most fun, most versatile, most satisfying, I ever had.
Then I put a 230* cam in it (from the same manufacturer, dropped the Scr to 10.95, took away the double-overdrive, and went 93 in the Eighth, but the fuel mileage took a huge nosedive.
The Wallace calculator says that 93 in the 1/8th is 433hp at 3467 pounds.
I still miss the prior combo. To get the bottom-end of the 223* cam back, I had to install 4.10/4.30s. Eventually I found a Commando 4-speed with a 3.09 low (instead of the 2.66 of the standard A833 box). I installed that, and went back to the 3.55s. Now it ain't quite so bad.
What has this got to do with the 360/380hp ?
IDK except that the 288/292/108 cam in the crate engine, has overlap of 74*, and in at 104 has an Ica of 68*, which together with the 9.0Scr engine, is predicted to make just 135psi@500ft elevation.
Ok so unless you don't mind running a big TC, and gears;
it will take off like a sick smogger-teen. At 500 ft, the Wallace predicts an adjusted Effective Dcr of a meager 6.9
You could do so much better........
For a comparison, the 11.3 alloy-headed combo I built with the Hughes HE2430AL cam, is predicted to make 192psi, and the Altitude adjusted Effective Dcr was 9.0; and it ran on 87E10, as earlier described.
It went 12.9@106@3650pounds......... trapping in third gear, at ~7000rpm, which is probably why it only posted 335 hp; 7000 was way off the game of that cam. But it was a one-run deal. It didn't break so I drove the 3-hour trip back home.
