I'm amassing the necessary parts to tear into my Holley 650 that I'll use on my setup. I'll be using the walk through from http://hangar18fabrication.com/blowthru.html

I'm curious about how much I should drill out the PVCRs, if at all for the 200-300hp range?

I'm also wondering if anyone can help me with choosing the proper primary and secondary jet sizes?

One last thing. I'm looking at running -6an, 3/8" fuel line with a 1/2" return line. Would this be sufficient?

I'm running a 650dp and a Garrett A/R .42 T3/T4 with the stock spring...7lbs, I'm guessing? I don't really want to go further than that.

Thanks guys!

 

For the power you are looking for you don't need to drill just block the power valves and run on jet alone , 67 on primaries and try like 75 on sec since your aiming for low boost , this should be a good starting point. , hope this helps

 

That sounds like a good start. Thanks! I'm glad that I haven't started the rebuild, yet. Would it be OK to go with 80 on the secondaries? I do have a large streetport 12a

 

For the 7lbs of boost u plan to run 80 on sec might be too big , but u can start from there and see. Once u get it running

 

Thanks again for your help! I finally tore into the carb, yesterday. If I knew how easy this was actually going to be, I would have done it a long time ago! It seems to have had a fresh rebuild before I bought it. It has 67 and 73 jets in it, now. I may start there and work my way up, if necessary. Are the jet extensions and the bigger 50cc accelerator diaphragms necessary for the build?

 

The jet extensions u don't need. But the 50cc accelerator pump kit. I used them before in my blowthru Holley