302 chevy

[jcharliem]

Stock DZ 302's did not make 360 HP, they made more like low 300's. There have been a couple bone stock Z28 Camaros that have been put on the chassis dyno that have put down 240 - 245 at the rear wheels. Back out 20% for drivetrain losses and you get just a hair over 300.

With a headers and the off-road cam they would get closer to that mid-300's mark. A good tuner should be able to get mid-300's out of one with factory parts and headers. This was a pretty hot motor back in the late 60's by the way. Geared right it would be tough to beat on the street.

The actual TransAm motors from Traco were dyno'd and made right about 440 HP. This was fantastic back then and nearly 1.5 HP per cubic inch. This was with state of the art (then) porting porting and real $$ behind the engine development program.

The mules that Kieth describes are VERY serious, and equipped with high end, high Dollar parts. Well maybe the Dart 230's aren't all that exotic but outflow even well-ported Camel Hump heads by a LARGE margin. Add in some other detail parts that are expensive (snappy roller cam and Jessel belt drive) and I can believe 500 HP . . . just not believable with the near-stock stuff in that 302 mentioned in the original post.

When you start looking at the 685 HP effort from 305" you can really appreciate the work that goes into something like that when you realize that there are much larger drag race motors much larger (like my 427 SBC, with some very nice parts in it by the way) that only make the same or a couple HP better than Kieth's 305.

360hp at the flywheel. Saw it with my two peepers. Although, there was a pair of headers strapped on it in the dyno room. It's possible the mill was sporting the "off-road" cam that Chevy had available in the 60s over-the-counter, although I don't believe so.

[SpiderGearsMan]

q jet 9:1 350 motors make over 300 hp
they rated DZ at 290 hp , a good running one would be putting out 325 at 6500
maybe they had highway gears

[dulcich]

Work the calculus, brother. I cipher that a good 302 cube engine takes 7700 rpm to make 500 hp, and that's a fact you can take to the bank. If it ain't there as far as peak hp rpm, you don't have 500 hp N/A.
-dulcich (The Wise and All-Knowing Engine Master)

[jcharliem]

Work the calculus, brother. I cipher that a good 302 cube engine takes 7700 rpm to make 500 hp, and that's a fact you can take to the bank. If it ain't there as far as peak hp rpm, you don't have 500 hp N/A.
-dulcich (The Wise and All-Knowing Engine Master)

That's as vague as the original post. What's even better, is a stock DZ302 would pull to about 6,500rpm before nosing over. Wow, another 1,200 rpm and bang, we got another +150hp! I like it!!

[dulcich]

Work the calculus, brother. I cipher that a good 302 cube engine takes 7700 rpm to make 500 hp, and that's a fact you can take to the bank. If it ain't there as far as peak hp rpm, you don't have 500 hp N/A.
-dulcich (The Wise and All-Knowing Engine Master)

That's as vague as the original post. What's even better, is a stock DZ302 would pull to about 6,500rpm before nosing over. Wow, another 1,200 rpm and bang, we got another +150hp! I like it!!

No, it is not vague. It is reality, and pretty damned precise at that.
-dulcich

[Mr4Speed]

Stock DZ 302's did not make 360 HP, they made more like low 300's. There have been a couple bone stock Z28 Camaros that have been put on the chassis dyno that have put down 240 - 245 at the rear wheels. Back out 20% for drivetrain losses and you get just a hair over 300.

With a headers and the off-road cam they would get closer to that mid-300's mark. A good tuner should be able to get mid-300's out of one with factory parts and headers. This was a pretty hot motor back in the late 60's by the way. Geared right it would be tough to beat on the street.

The actual TransAm motors from Traco were dyno'd and made right about 440 HP. This was fantastic back then and nearly 1.5 HP per cubic inch. This was with state of the art (then) porting porting and real $$ behind the engine development program.

The mules that Kieth describes are VERY serious, and equipped with high end, high Dollar parts. Well maybe the Dart 230's aren't all that exotic but outflow even well-ported Camel Hump heads by a LARGE margin. Add in some other detail parts that are expensive (snappy roller cam and Jessel belt drive) and I can believe 500 HP . . . just not believable with the near-stock stuff in that 302 mentioned in the original post.

When you start looking at the 685 HP effort from 305" you can really appreciate the work that goes into something like that when you realize that there are much larger drag race motors much larger (like my 427 SBC, with some very nice parts in it by the way) that only make the same or a couple HP better than Kieth's 305.

360hp at the flywheel. Saw it with my two peepers. Although, there was a pair of headers strapped on it in the dyno room. It's possible the mill was sporting the "off-road" cam that Chevy had available in the 60s over-the-counter, although I don't believe so.

If it had the off-road cam in it you'd know it-they're really snotty-like a really rough 1000 rpm idle.

I love 'em!

[TC]

Work the calculus, brother. I cipher that a good 302 cube engine takes 7700 rpm to make 500 hp, and that's a fact you can take to the bank. If it ain't there as far as peak hp rpm, you don't have 500 hp N/A.
-dulcich (The Wise and All-Knowing Engine Master)

A good 302?? And are you trying to say, all you have to do is spin the motor 7700rpm and you'll make 500hp?? Wow if that's the case I want in on the secrets.

Fact is you can make 500hp with a 302 at 6000rpm just as much as you'll make it at 8000rpm. It all depends on how the heads flow, the specs on your cam and the compression you are running, along with a list of other things. Your statement that all it takes to make 500hp with a 302 is to spin it 7700rpm is purely a fantasy. Can it be done, sure it can, but you can also make that same HP at other rpm levels and that's a fact. Basically there are just to many variables to make a statement like that.

[jcharliem]

There's a formula whereas a derivative of RPM and CID = HP? What have I been missing? Did "Volumetric Efficiency" and other factors in determining power just fade away? Maybe I missed that over the years.

[SpiderGearsMan]

my number was realistic

[SuperBuickGuy]

Math says lots of things, however, getting parts to operate in a manner that proves the math; is an altogether new game. Of course, the other problem with math is the numbers are never quite as accurate at describing the observed phenomena as we expect.