Pro Action 360s on 462 / 496BB, 14:1

[67RS502]

What do you guys think of stickin Pro Action 360 heads on a 462 or a 496 with 14:1 comp?
a friend is doing a new motor combo, and I'm tryin to get him to rethink his combo, hes new
to this, but his machine shop told him that a 14:1 462 / 496 with a tunnel ram and the 360
heads will make 700hp. This is going in a weekend streetcar, and the bad things is all he wants
is to run 10.0s in his 78 malibu. Will the comp. make up for the lack of cubes with these big heads?
(I do pump gas streetcars, so I'm not too familiar with high comp. motors.) I also told him that if
all he wants is 10.0s I'd help him build a mild pump gas, stock headed street motor that will run
low 10s, similar to mine. I think hes machinist has him talked into a combo that will not
be very streetable, and he will have to buzz it to make good power. So what will these big
heads do on this motor, and the tunnel ram will make it worse yet. Hes young and on a budget,
but doesnt seam to be taking the cheapest / simplest way to obtain his goal.
Thanks
Rafel

[MAT]

On a budget and rpm do not mix - sounds like this guy is being set up on the "pay me now, pay me later" plan.

IMO

MAT

[cboggs]

Yep, I think those heads are much too big for his combo, ..
it'll be a slug till about 1000, 00000 rpm.

tunnel ram will make it worse, .. . ..

curtis

[Darin Morgan]

Yep, I think those heads are much too big for his combo, ..
it'll be a slug till about 1000, 00000 rpm.

tunnel ram will make it worse, .. . ..

curtis

Unless you have Titanium valves, a very large yet smooth cam and are willing to make power from 7000 to 8800rpm, Those heads are way way way to big.

[headman]

I'm working with the smaller 320 head and for a 500 cid "street" engine I cannot imagine needing more head.
If this person could be convinced to buy the smaller head there is no doubt he would have the better performing engine.


Don't tell me...they will "port" the 360 head for more flow


A simple single 4bbl intake would be a much cheaper mistake than the tunnel ram.

Does anyone have any dyno experience with the 320 head and intake manifold preferences/recommendations?

[cboggs]

I've had very good luck with the Edelbrock Victor & super Victor
series of intakes, .. they might be a bit "much" for the street though.

I've used Brodix too, .. and in ported form seem to make good power, ..
but I've never dyno'd the Brodix & Victor back to back.

Darin uses the Victors on the R&M super series engines, .. maybe he
will chime in.

Curtis

[headman]

I've always been safisfied with Edelbrock intakes.
If I don't have a really good reason to use something else I will go with the Edelbrock. seems a safe starting point..

[67RS502]

Thanks guys, I think I have him talked out of it, and into makin a mild street combo,
then maybe thinkin of doing something more radical later, but with a goal of 10.0s, I
dont think we need to get too radical... but since we're on the subject, how much would
such a big head, the 360cc, move the powerband up? compared to say a small
rect port around 300-310cc, assuming both heads were out of the box. I'm guessing
a 310cc head would be about right for a 5000-7000rpm 462-496BB. Would they move
the powerband up a 1000rpm, or would min. cross section really be needed?
I do have to say that my 049 oval ports work better then expected, and seam to support
my 502 to around 6500rpm, I shift at 6700rpm and thats where it mph's the best,
surprised me that a set of bowl-worked 049s would rev that high on a 502 with a
cross section area of around 2.5"
On intakes, I like the Dart. Mine is an oval port, but the plenum is good, and only really
needed some work on the plenum to runner entry. Also the runners are long, and straighten
out fast before the head.

[Darin Morgan]

I've had very good luck with the Edelbrock Victor & super Victor
series of intakes, .. they might be a bit "much" for the street though.

I've used Brodix too, .. and in ported form seem to make good power, ..
but I've never dyno'd the Brodix & Victor back to back.

Darin uses the Victors on the R&M super series engines, .. maybe he
will chime in.

Curtis

If you have never dynoed the Victor intake your missing out. Its worth power. Thats the only manifold we use on conventional heads and we could use any of them.

[cfperformance]

Does anyone know off hand the dimensions of the runner entry area in the plenum of the Edelbrock BBC Super Victor or the Victor intake?

THanks.