Cylinder head flow - What is crucial in a stocker?

[Chris Hardy]

I don't know if this is what you are looking for.
These are my basic rules:
.100" lift, don't waste your time making this flow.
You want the most flow at the fastest piston speed areas from 1/3 through 2/3 of the stroke.
I don't monitor this page much, so any questions, please message me on my FB page.
Thanks
Chris Hardy
RET

[Stan Weiss]

You can also look at what some call "Piston Flow Demand". This is calculated by using engine RPM (Time) and change in Volume above the piston. This graph is a 305 ci @ 7000 RPM

Stan

[jamie2370]

What I can tell you is this. You can take a sbc stocker combo, put decent shortblock in it, do only the allowed valve job to the heads with best valves and springs, assemble with the latest greatest cam and lifters, put it in the car with a name brand carb, name brand trans and converter and I can almost guarantee you won't be within 7 tenths of the top cars with that combo. SO....heads and intake are 90% of the power. Plus if they really answered your question then they couldn't charge $5000 for a set of stocker heads and $1800 for an intake lol

[Frank Castros]

Originally Posted by jamie2370

What I can tell you is this. You can take a sbc stocker combo, put decent shortblock in it, do only the allowed valve job to the heads with best valves and springs, assemble with the latest greatest cam and lifters, put it in the car with a name brand carb, name brand trans and converter and I can almost guarantee you won't be within 7 tenths of the top cars with that combo. SO....heads and intake are 90% of the power. Plus if they really answered your question then they couldn't charge $5000 for a set of stocker heads and $1800 for an intake lol

Pretty much the state of the union, right?

[Race Wife]

On the same thought you can and I am guilty of this, give someone the best engine and drive train and be .07 slower than the fast guys. Friends are the cheapest increase in performance.

[Billy Nees]

Originally Posted by Race Wife

On the same thought you can and I am guilty of this, give someone the best engine and drive train and be .07 slower than the fast guys. Friends are the cheapest increase in performance.

If I may, I would like to make a small correction to your quote;
Listening to friends is the cheapest increase in performance.

[outlaw]

I think when it comes to performance advise don’t let who is telling you they are the best work on your stuff go to the track and all the cars that you are amazed by let whoever they say is the best that’s who you want working on your stuff. A lot of our drag racing heroes know more than the guys at the machine shop. I know I used to work in a machine shop and when some of the old school drag racers came in and started spitting out cam tech and stuff then when they left I’d be standing there looking like Dewey Cox after talking to Elivis in the movie walk hard.
Terry

[Randy Wells]

Originally Posted by jamie2370

What I can tell you is this. You can take a sbc stocker combo, put decent shortblock in it, do only the allowed valve job to the heads with best valves and springs, assemble with the latest greatest cam and lifters, put it in the car with a name brand carb, name brand trans and converter and I can almost guarantee you won't be within 7 tenths of the top cars with that combo. SO....heads and intake are 90% of the power. Plus if they really answered your question then they couldn't charge $5000 for a set of stocker heads and $1800 for an intake lol

What percentage of ET do you think is attributed to, suspension, shocks, weight distribution, transmission and overall set up of chassis?

Randy Wells
I/S 5628

[jamie2370]

Originally Posted by Randy Wells

What percentage of ET do you think is attributed to, suspension, shocks, weight distribution, transmission and overall set up of chassis?

Randy Wells
I/S 5628

A decent portion. In my case I am refering to a proven car that has been a second under.

[B Parker]

So, let's take a small block chevy. How much HP do you think it takes to pick up a tenth? To make it easy let's say a 69, 350/255 hp combo. BP