Grossi and the Big Block

[larry dowty]

ALL i know is that is one fast car.

[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.

[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!

[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