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Not saying your right or wrong, I've never ported a set of heads in my life, (why I'm glad your sharing your progress) but seems to me with lot of porters the throat size is the starting point they seemed to have sizes for a given application same with short side csa and pinch csa and the taper...

No arguments here just wanted to crunch some numbers. All good

It would be interesting to test how much influence the pinch has on something where increasing it yielded basically no flow increase. Like a moderately ported TA head……ported to the mid-260’s, and installed on a stout enough stroker to be sure it would exceed 2hp/cfm. Heads like that will still...

That's why DCR never changes.

I agree that initially there is a big time investment but that will diminish quickly if the user takes an active role in the tuning process. The tuning concepts are the same as they would be with a carbureted engine they’re just presented in a different format. That said, if you’re not...

And, yessir, that is a '59 daily driver Ranchero in the background. Any bids? Runs good and only driven to church on Sunday by a little old lady. We only talk A Body 'round here.

I'm seeing maybe a fuel pump and a coil. She finally tooled out of the shop, only to quit the next day. I'd been concerned about a bad ground but was told by two sources that nah, all was good. Then she died five miles later on a new battery. A new shop quickly found a bad ground made of old...

I guess it comes down to what your designing these heads to do, if it's for a particular engine and rpm combo etc.. Or a more generalization application ?

My opinion and experience (for what it's worth) is that throat size is a result, not a goal in and of itself. The size of the throat is a result of getting the bottom cut angles and blending to direct the air where you want it to go. I have also found that the throat size can be used to...

12K later, Mabelline is up and running. It is just shy of an as-new restoration. Everything busted has been replaced with New Old Stock or a good facsimile. The fuel tank was rusted from the inside out, so not finding any, we opted to coat the inside. First few tank fulls, everything was fine...

If you are buying aftermarket and have the option, different offsets would make it more bolt on for sure. If you want cheap and/or used and easily available (e.g. Mustang), you might need spacers in the back depending on what you find if you want to keep your current axle. Might be worth doing...

Where is this drag strip supposed to be getting built?

I think when most people refer to dynamic compression ratio, they're referring to the actual calculated compression ratio from the point at which the intake valve closes. I know when I've used DCR calculators in the past, that exactly what they're calculating - with no inputs for load, VE, or...

I really like the offset hood detail to accommodate the slant. It's kind of just "Right In Your Face"

If porting for a general application guess you got to pick a happy medium for a general built 408 and or 340/360 of X hp, say 500 hp at what rpm these engines generally make 500 hp and what port volume and pinch generally needs to go along with that.

Why is the bowl not at 91% for the 50? I’ll hold my thoughts for now but I’m sure most of you know what I’d say.

I've spent some time looking at Chad Speir's ports and the shapes he uses. I think he is often porting for the stock classes so he is forced to get as much flow as possible from a set port volume. Much the same as you are discussing.

It’s part of it. The HIGHER the unfired cylinder pressure, the higher the power. The LOWER the unfired cylinder temperature, the higher the power. Higher unfired cylinder pressure requires LESS timing (the opposite of why you want vacuum advance at a cruise) and that means less negative work...

I can't find it but I have post it before, forget what class but they had like a 162 cc limit with stock j heads and something like 370 spinning 7500+ rpm , to go faster obviously they needed more port volume but they couldn't so they lowered the flow (lowered the velocity 330 to 320) and gained...

Ewwwwwww. lol

No. Define dynamic. I know guys love **** like this but most of it is pointless. Think two stroke. It’s the exact same thing.

I've wondered how far to go with port volume and larger pinches. As we have discussed, sometimes enlarging the pinch will hurt the flow. There is also a point of diminishing returns with making a port larger. After the port gets so large (volume wise), additional volume increases yield less...

Not argumentative guys. It’s info. My 904 VB didn’t have the pin there and didn’t affect anything that I could tell. May just be there to backup the spring?. To the OP, the rooster comb holds the ball in. Be careful as that ball can shoot off somewhere in the process. I use a feeler gauge to...

Turkey breast on the smoker and Chicken chili is in the crock pot. I need to add the chicken but it is cooking on the stove and not quite done yet. Cool it, shred it, and add it to the pot. Damn is it smelling good in here. I especially like the smell of the cumin in the chili. A big clump of...

So the dynamic stroke changes?

Not planning on rear discs. I wonder if I should figure radically different offsets in front and back, due to the track difference.

They work great.

You will spend a BUNCH more time fiddling with, and learning to tune ANY aftermarket EFI system.

The only reason I could see A making more power if the engine needed port volume and pinch area over more flow.