May I ask ,who is spyder performance. Do you have any pictures of port work .Were they ever flowed on a bench. These are iron rectangular port gm castings, correct?

From what I have found out Spyder performance was/is in New york or NJ cant remember which. The owner passed and Im not sure if business kept on going or not as I didnt have the work done initially. They basically have a nice port match from what I can see. I think Predator cams used to use them and not sure who else. Yes sqaure port iron heads. Very cheap price even if you were to have them dissassembled and gone through, I also have matching ported Dart 6200 intake.

Is the dart intake for a 4150 carb?

How much for the dart?

Yes for 4150 carb. I have 2 of the intakes. They are listed on here as well. Both have some corrosion around the thermostat neck and water ports but came off running engines and did not leak. I would epoxy or use a little extra silicone at installation. $100 each plus shipping.

Do you have casting numbers for the heads and any pictures? [email protected]

SOLD pending payment