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I've got a pro-systems 4150 and when ordered Patrick said there wasn't a difference from the cast Holley blocks he uses or his upgraded billet blocks.

After having some discussion about this with a buddy he pointed out how porus cast blocks are, how the fuel paths aren't as customizable and how casting differences can vary compared to the cnc'd billet blocks.
And most other brands use a billet block on their race carbs.


What are your thoughts, are billet blocks worth upgrading to?
 

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I was told by Pro Systems that they have to use epoxy in the billet metering blocks to reduce the size of certain passages. This is not necessary with the cast blocks. They also said that the epoxy needs to be replace every 3 years. Because of this they will only install billet bocks if the customer wants them. I don't know if this applies to all their carbs but it did to a 1300 cfm Dominator I bought.
 

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I was told by Pro Systems that they have to use epoxy in the billet metering blocks to reduce the size of certain passages. This is not necessary with the cast blocks. They also said that the epoxy needs to be replace every 3 years. Because of this they will only install billet bocks if the customer wants them. I don't know if this applies to all their carbs but it did to a 1300 cfm Dominator I bought.
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I was told by Pro Systems that they have to use epoxy in the billet metering blocks to reduce the size of certain passages. This is not necessary with the cast blocks. They also said that the epoxy needs to be replace every 3 years. Because of this they will only install billet bocks if the customer wants them. I don't know if this applies to all their carbs but it did to a 1300 cfm Dominator I bought.
They should make their own or get some from BLP with smaller passages. Holley blocks work, but no reason to use epoxy. What passages would they possibly want SMALLER on a 1300 CFM Dominator?
 
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