Grossi and the Big Block

[Jared Jordan]

Originally Posted by larry dowty

ALL i know is that is one fast car.

It is definitely FAST.

Car#-Driver(Opp'nt)-RT-----ET-- Speed-----Car#-Driver(Opp'nt)-RT-----ET-- Speed
7056 Frank Grossi 51 Gary Stinnett
E5 ****WINNER**** 0.095 9.073 145.80 0.033 9.232 147.73
GT/AA Dial: 10.40 (+/-): -1.327 GT/AA Dial: 10.40 (+/-): -1.168

[bsa633]

Originally Posted by Jared Jordan

It is definitely FAST.

Car#-Driver(Opp'nt)-RT-----ET-- Speed-----Car#-Driver(Opp'nt)-RT-----ET-- Speed
7056 Frank Grossi 51 Gary Stinnett
E5 ****WINNER**** 0.095 9.073 145.80 0.033 9.232 147.73
GT/AA Dial: 10.40 (+/-): -1.327 GT/AA Dial: 10.40 (+/-): -1.168

how about Stinnetts speed ..pretty stout if its true..

[Lynn A McCarty]

FJ,

I heard there was a HP review on that 1975 454 and they took HP off due to the smaller 220 ccs where the 1974 454 had upwards of 250 intake ccs.

We found that pretty funny because our 455SDs are rated the same horsepower (325HP), dont have splayed valves, has less compression, and our intake runners are 188ccs.

I would say there are tons of potential in that BBC Combo, hats off to Frank for making the correct pick!

[SPS]

Lynn:

That's the point. NHRA tech's "throw darts at the wall' approach to factored hp figures has to go.

All this can be solved by submitting a finished head for flow testing to determine its HP capabilities. We need to get into 21st century technology.

FJ

[SSDiv6]

Originally Posted by SPS

Lynn:

That's the point. NHRA tech's "throw darts at the wall' approach to factored hp figures has to go.

All this can be solved by submitting a finished head for flow testing to determine its HP capabilities. We need to get into 21st century technology.

FJ

Are you saying submitting a finished a Stock or Super Stock head to NHRA? If you are saying to submit a finished Super Stock head to NHRA, you are dreaming!!! NHRA does not have a flow bench and doubt anyone in the Tech department knows how to use one. Taking this into account, they send the cylinder head to a shop that may also build SS engines, so this way they can get the knowledge and hard work of other shops for free.

[Lynn A McCarty]

FJ,

Let's face it, most all GTAA combos are "favorable" combos or they wouldnt be running them ours included. The square port big block combos are tough at 3610lbs.

I dont think the head flowing rule would work. The same thing would happen there as happened with the CC numbers. That is the biggest farce in SS that no one talks about ('cept yours truly). People would show up with bogus heads. How you gonna calibrate the flow bench? Stacy recently got a set of heads flowed on 4 flow benches. He got 4 way different numbers.

Also, head flow is only 1/2 the battle for making power. Especially in a larger cubic inch engine. In fact, most head porters will tell you that they go for port shape first and flow second. We recently did dyno testing on the cross sectional area of the intake port at the push rod. We lost 60HP even though the flow was about the same.

We bonehead technical guys even have an equation for it. (It serves my anal retentive tendencies very well ) Just for those interested in such things. To me it is fun to find good operative tools that we can find good correlations in science. None of them are perfect and there are always exceptions. (disclaimer Travis style)

Choke:

CSA = bore * bore * stroke * RPM *.00353/614

CSA = minimum cross section of your intake port not the average
614 is feet per second (usually actually twice that of a pitot tube measurement) This number can move around a bit by maximizing factors that contribute to intake Choke

[Jeff Lee]

Originally Posted by SSDiv6

Are you saying submitting a finished a Stock or Super Stock head to NHRA? If you are saying to submit a finished Super Stock head to NHRA, you are dreaming!!! NHRA does not have a flow bench and doubt anyone in the Tech department knows how to use one. Taking this into account, they send the cylinder head to a shop that may also build SS engines, so this way they can get the knowledge and hard work of other shops for free.

That's if they don't loose it!

[SPS]

Believe me, I realize this is idealistic, but if you check with compentent engine designers and builders as well as the cam people, they will tell you that with accurate information, the HP can be accurately predicted from the head flow.

Yes, Lynn, there is a lot of bogus info out there from flow benches to dynos. I see it regularly, as I've had my dyno and bench for over 20 years.

The point is, the rest of us shouldn't have to wait until (or if) the factoring system "fixes" these inequities.

FJ

[RJ]

You can't use port volume as a barometer either, port length throws that one out.

[Dick Butler]

SPS, There is a large group who support the "underfactor deal" They feel the picking of a combo that has been overlooked or inadequately factored is special part of S and SS. Meanwhile a few who HAVE a race car and are financially committed to one combination get HP whenever one of the upper group hit the index deal of AHFS. The only way it will stop is 1) limit the engine combinations to those currently factored and upgrade the AFHS to Really hit the odd combinations( Wont happen)
2) make people submit new combo to NHRA TECH for upgraded factor BEFORE the Monster shows up.
Problem is now days if people can change to keep up after 10 or so are built THEN NHRA seems amazed and starts to factor them even if too slowly.
Some people make a life style of running a "weak" factor motor, winning selling it and moving on to the next weak factor. They are heros in the sense they excell at this part of the rules. Could they be the fastest, quickest, best if 10 were built in their class. Answer is doubtful they are just so first with the combo they are great at the game....they play.

Think there are not some WORSE killers out there now? I agree the method is antequated to use the Dartboard techniques.