i have a 355 882 heads 440 lift cam holley 650dp carb roller rockers performer rpm intake i need to know what jet sizes to start off with for the carb thanks.

 

Start with what's in it.

 

my brother had it on his truck with a 460 520lift cam and he had 75's or somthing in it and it was geting to much at idle. i just wanted to know what they came with or what would be good for it.

 

The jets are in the main metering circuit, not the idle circuit. If it was getting too much fuel at idle (a common problem with universal application Holleys), the idle circuit needs to be adjusted, not the main metering jets.

 

Let me answer this question.

Start at the sticky at the top of this page: https://www.thirdgen.org/techbb2/sho...hreadid=101977

Click on this link: "Holley Technical Information"

Which takes you to this link: http://www.holley.com/search.asp?que...Info%20FMCTech

Click on the "Tech Service" button in the left margin, which takes you to this page: http://www.holley.com/TechService/

Click on "Tech Library", which takes you to this page: http://www.holley.com/data/TechServi...%20Listing.pdf . From there you'll need to know the "list" number, located on the choke horn of your carb. Find it in the list, and it will tell you what jets and power valve it originally came with. You can use that as a starting point.