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A fiberglass hood is not legal. Did you mean to say aluminum?

INTAKE: Must use unaltered aftermarket aluminum intake. From the rules.

The adapter is 2 straight round holes. It is the adapter you must use if you use an adapter and it cannot be altered. The adapter is only 1/2" thick. I have dyno tested the stealth and the Edelbrock and there is little difference between the two. My motor liked the Edelbrock better. Send a...

You have some conclusions about zinc that do not agree with what some others in this thread are saying. There is nothing wrong with that. I suggest with an open mind you present your conclusions to experts in the field tribology and get their input about what effects zinc has in oil and what...

The test could be done with different levels of zinc. It wouldn't have to be with or without.

You said the cam is broken in already and I assume the rest of the motor is too. So you don't need break in oil any more. Now you need racing oil for flat tappet cams. There are many oils that are suitable for this. Take your pick. As a hobby stock you will probably put more or less 30 laps on...

What do you mean by "oil is changed after each session"?

Thanks for the reply. Very informative.

You said you have a friend "who knows". Ask him which passage or passages from the main gallery 1-4 are going to receive no flow because the gallery is being fed from opposing ends. Maybe he can explain why this happens.

Your assumption about what you think I assume is incorrect. I will repost #54 with my question. "That is not my assumption. I didn't say pressure was equal through out the engine. I'm trying to figure out how having opposing feeds in the gallery stops flow at some point in the system. Can...

@Newbomb Turk . This is a continuation of post #54. In this diagram representing an oil circuit being fed from two opposing ends. Where in the main oil gallery would oil stop flowing?

That is not my assumption. I didn't say pressure was equal through out the engine. I'm trying to figure out how having opposing feeds in the gallery stops flow at some point in the system. Can this only happen if the pressure is different at each end of the feed? or will this still occur if the...

Are you saying that if the oil pressure was the same on each end, that having opposing feeds in the gallery does not stop flow at some point?

In the scenario we are discussing, why would there be a different pressure on each end of the gallery?

What you said was "Having opposing feeds in the same gallery can stop flow at some point in the pipe." When I read that statement it struck me. It's not how I understood how hydraulics work. Maybe my understanding is wrong and I can learn something from this. That's why I asked you why you...

What are you seeing the evidence that leads you to believe that pressure feeding from opposing ends of a gallery stops flow at some point along the gallery. Is there a hydraulic principle in a book or some where on the Google machine that that explains how this could happen? I might be...

I still don't understand what hydraulic principle is at work to cause this.

If you have pressure with no flow, then you have a sealed system. If you have pressure and oil moving through the system then you have flow. I haven't mentioned the cross over hose.

The way I understand hydraulics is if you have pressure even if it is supplied to each end of the pipe as long as there is an area of lesser pressure in the system there will be flow to that area of lesser pressure.

What hydraulic principle is at work to cause this?

It is possible to have the wires in the right firing order but indexed wrong on the cap. Check that number one is in the right place on the cap.

First, you have to decide what the safe rpm limit for your motor is. How hard can you spin it with out breaking it? The maximum allowable rpm for Imca is 7000 rpm. Limiting the rpm to less than 7000 is probably going to limit the potential power output of the engine. That said whatever you...

You can't run a roller cam in IMCA. When you get a minute you should read through the rules. https://www.imca.com/wp-content/uploads/2023/11/2024-Hobby-Stock-Rules.pdf

Bolt pattern is the same. The common wall between the center exhaust ports is a little wider and the shape is squarer. It is less effected by the headbolt. Take a look at your heads next to a set of non magnums and you will see the difference.

9 Inch Grand National Floater Rear End Kit, 31 Spline 5x4.75, 58" This link shows an example of a floating rear end. The wheel doesn't rely on the axle to keep it attached to the rear end. Better call IMCA first and see if they will allow you to use the header. If you can borrow a header for...

Open motors were already on a 2" pipe as were the crates. The difference for 2024 is the crates get a 2.25" pipe and both get a shorty header. If IMCA will let you, Schoenfeld can put a mopar flange on the same spec header the chevy uses. Your definitely going to want the shorty over the cast...

I think they run 6.20' s with a crate motor and that chips at 6200. Open motors run 7000 rpm. I can ask one of my customers to verify a gear for an open motor. You should check with IMCA and see if you can run a shorty header now that they are approved for the chevys. Is your motor is set up to...

Sorry, I meant to ask Rapid Robert that question.

Which tracks are you racing at?

Couple of questions if you don't mind answering. What did you use to shim the plunger? How did you adjust the the rocker? Thank you.