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I bought castings only on black friday 2020, with shipping was under $450 for the set. I had my engine builder put good components in them for another few hundred. I doubt the car would run any better with Edelbrocks for twice the money or more. Its a 360 with stock crank and rods with Icon...

I am not under the impression a given A/F will get me away from adjusting my dial with the weather. I am asking to see if and at what A/F people have seen the changes with weather effect ET less. Thanks for the calculator suggestions, I really appreciate it.

I stand corrected, I should have said there are many reputable folks that believe jetting is beneficial at different altitudes.

Density altitude will change 1,000 to 1,500 feet throughout a day of racing for me just about everyday. So you are saying Warren Johnson said proper jetting at a mile high is the same jetting as sea level? Do you think he was compensating in other ways? I don't think you can find any...

Most serious bracket racers I talk to will rejet at least a few times a year and some much more often. I have and would again trade a tenth or two for more consistent.

That doesn't mean I think it is or should be flat.

What makes you think I think it should be flat? The trajectory example was not intended convey the desire for a flat for A/F curve, but to make the weather changes less extreme making them easier to predict and more forgiving if you predict incorrectly.

Would you not want to have a tune up that made the car the most consistent? Is it possible AFR is a key factor in a consistent set up that changes less with weather making the car easier and more predictable to dial? I am trying to flatten the trajectory similar to predicting vertical hold...

Yah thats my whole point. Trying to figure out if anyone has noticed a base AFR reading that varies the ET least with given weather changes on an average day.

I would agree with it not being possible all the time especially with only getting one or two time trials, but surely those that track have some idea about what it is and how consistent the car is that day.

For those that track it, what is your experience as to what air fuel ratio you have experienced the best consistency when bracket racing.

Updated 11.65 @ 114.72 it aint much but its something.

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The time would be very similar. With a highspeed machining center you can make 20 or more passes with a proper constant chip load that wont wear the tool as quickly, chatter or rub like a large cutter in the same amount of time with more precision and adjustability. In addition to the...

Coming from a tool and die making environment making plastic injection molds and precision manufacturing fixtures for 25 years, machining an arc like this with a single pass with specific sized tool is not the way to it. A single pass with a large cutter will typically result in a poor finish...

Is that a B3 spacer kit? Did you check or correct your saddles for the rocker shaft to make sure they were correct?

He said the shaft needs to up and towards the intake manifold. Mike has already posted here so I doubt this will put the kibosh on anything. The cutting the heads I was referring to was related to some of the speedmaster heads having saddles that are too wide and allow the shaft to move. This...

11.60's @ 115, but I haven't really tuned it to try and go faster. I run a 12.0 and slower sportsman class. With the secondaries on my 750 double pumper disconnected, short shifting at 5k, and a throttle stop out about 2 turns it runs 12.0-12.2 depending on air and launch rpm.

I cannot do that, I have already sent the rockers back to where I bought them and put my old ones back on. From what I have learned through this process the shaft will need to move up and toward the intake to get to ideal geometry. Once I learned I would have to likely pull the heads to make...

Its biased toward the exhaust side, the pictures show it fairly well.

I am aware of adjustments to the spring seat from machining or shims and various lock options. So installed height was not the right term to use to indicate the height of the stem, but its what I was referring to. I sourced many of the parts and directed him on most of the remaining parts...

I think maybe you have misunderstood, I have no doubt Mike can help. As I have said previously I am not willing to take the heads off to mess with this when racing starts in a few weeks and I have an option that works fine already on the motor. Mike said at the very least I would need to open...

I am not sure, I will look to see if its on the old invoice. I believe its all about installed height, but what I know is the stock type adjustable rockers that are on it currently line up great which should indicate the heads are a good copy of factory.

I will try and find it to see. I would think based on when I bought them sometime in 2020.

Good to know, I may hang on to them for when I get some Trick Flows or incase I ever go back to my J heads. I am wondering if the chevy valves my engine builder put in these heads could be contributing to the issue? Because the stock type adjustable iron rockers (273 type) have great...

So I inspected my saddles last night and compared them to some J heads I had with a radius gage. There is no high spot in the middle and my rocker shafts nest tightly with no movement. If anything there is a slight amount clearance at the very bottom of the radius allowing the shafts to seat...

I am not taking the heads off the motor at this point. Car ran great and consistent last year. I will just keep an eye on it.

I think the problem with talking about Speedmaster heads is they are a hot button topic for many. Some absolutely hate them, some think they are a good value with some risks, and some wont run anything besides cast iron. I am somewhere in the middle, with good components I am getting a good...

Thanks guys talked to Mike, he is a very knowledgeable straight shooter. After talking to him for a bit I am going back to my old rocker set up until I upgrade my heads or take the motor apart as there are no real bolt on options that wont likely require cutting on the heads. Also I am running...

I recently purchased some Mancini 1.5 roller rockers for my bracket car, link below. Mancini Racing Aluminum Roller Rocker Arm Kit The motor in my bracket car currently has 273 adjustable iron rockers on it which ran fine last year but I wanted to upgrade. Is it reasonable to believe that I...