My 304 build

Actually, the RIGHT 1-5/8" headers may not be all that bad:

Well,
I reached the goal today?
A simple pocket ported small valve head based on a 086-1 casting that moved 250 cfm on the intake at .600
I did not flow higher for obvious reasons. The motor will never have that much cam.

At .500 it was moving 235 cfm
At .400 224
At .350. 217
At .300 199
At .100 70


I broke the plenum on the bench after the intake, so I won't have numbers for the exhaust.
But it will improve too

Now it's time to install these heads and let this this eat.   I'll know soon if a pocket ported, if you wanna call it that, head will wake a little 304 up enough for me.
I'm even thinking of this same head on a 401. Since it won't
See more than the .600 lift either it should have a lot more airspeed. Making it somewhat snappier

Got both head assembled today after cleaning them good from all the work,
The valve drops are all within .01 to.03 of each other and the tip heights are right on too.
Lapped out good and I have a good positive seal on rhe head now.

The head was decked .025 also. That way it somewhat matches my thinker head gasket I have to use. The stock one was about .020. These are pushing .045

So I should be close. Once I get the heads on her I am ordering pushrods as long as the ones I have odd not work. I have numerous set. A think my 6.750 pushrods is going to work. That's crunching my numbers in my head still though.

I will tomorrow work out the exhaust port on the headers. Going to get them to be bout as right as they can he. And if that doesn't make me happy ill try the 173/4 pipes or make a set myself on a step design.



I am also for a 409 inch amc motor.
I will still with smaller valves. I am thinking a 2.0 inch on the intake would do it
Then concentrate of airspeed sand feed air that way. The motor like that should really be fun. Especially for a car that turns a

I'm more into losing weight too. And my final mods during assembly was to use the talthentotrim off material on the ls9 retainers.
So there now sitting at 8grams dash. Down from eleven . So now the valvetrain weight on project 304 has a weight savings of 5.60 ounces. That over a quarter point just in valve train. Meaning I can run less seat pressure now and still control the valve. Any power gains would come from friction at losses
And the motor should rev much quicker.

I could also at this point toss the ls1 rocker arms onto her.
Like amc john does here on the forums. Not sure if he has a project up and running yet but it's doable. And I have the parts.

That would put lift up from 477/485 to around a .505 lift and a .515 exhaust lift.
Right in the meat of the curve.

I am going to pull the headers out tonight and working the flanges.   I'll clean up the windows and some transition if I can. Just to help. I am thinking about coating them too. Or wrapping it in wrap.

I have the oil baffle made for underside of intake. It is bolted on her now too
Carb is pre jetted for what I think it will need. One it's running I'll check it out on af and bring that in that start tweaking timing events. How much how fast Nd how soon.

If needed I can switch to e85. But that is not the plan yet

+ Crossed fingers.