What 325 head does brodix have? Either they sucked bad or that blower worked very well larger runners and more cfm. It's almost like they were very restrictive. Sure there was no resrictor plates pulled out? Lol.

Hey getrdunn, Are you using those Bowtie blocks on you Promaxx build?

That was the plan anyway. What are you thinking.

4.500 bore, JE -28cc pistons, the above mentioned Brodix heads and hydraulic cam, stock 256 blower that was stripped by DMPE, 3.25" pulley. Swapped out the injectors in the throttle bodies to Eddie Young's injector plate under the throttle bodies. Dyno tuned by Eddie.

the young man working the gas pump couldn't get the 93 pump to work, so he took it upon himself to fill it up with 87 while I was at the drivers meeting. I had a half tank of 93 when he filled it up. He did tell me before I took off. I ran easy, 4000rpm, but within about 5 minutes it started running bad. I can only assume that the knock sensor pulled out enough timing that the EGT's went through the roof. 30-60% leakdown through the exhaust when I got it home.

Almost as bad as the kid at a nearby marina filled up a cruiser 400 gallons with gas. Boat was a diesel. Costly mistake.

I will have to check. Eddie bought them as bare castings, milled and assembled them. I believe that they are a BB2 as well, but maybe not the BB2 EXTRA. They are an "as cast" head. Just cnc'd the first inch or so into the intake runner.

At 14:40 here, he talks about intake runner "size" ....with forced induction.

The original heads that I burnt the exhaust seats out of were BB2 EXTRA's as well. I will measure the volume and get back with you. On first glance, it looked like the valves were fine, but it was suggested to me that I measure the length. When I measured them, I found a couple that had stretched over .060" Seats were toasted and sunk in the castings.

Sorry about derailing your thread FF

At 18:40, he explains why, big diameter intake valves, can suck at low speed torque. My cylinder head guy, explained the same thing to me, when I mentioned replacing the 2.25 valve in my heads, with a 2.30 valve. He told me, my combination, would not benefit from the larger intake valve, as i just don't turn enough rpm to take advantage of it, and I'd likely make less power in my rpm range with it.

Which coincides, with my software as well. Required intake valve area, doesn't start coming into play, until you get to a certain cubic inch/stroke, and rpm level. Thats exactly why, a vortec or peanut port truck head, has small valves. They could have easily stuck a 2.19 valve in those heads, but they would have lost low end torque by doing so, and thats what they were after.

These are things a custom cylinder head guy, can address when he builds a set of heads for a customer. Sure, they can be put on a flow bench and be made to make good flow numbers, but that doesnt tell the whole story. Sticking in an oversize intake valve, could amplify intake reversion issues, and even though you might have a small high velocity port, by putting in that big intake valve , you may be worse off, than a slightly larger port, with a smaller diameter valve, is torque is what you seek at low speeds.

I know it has been stated many times in different threads here, but if someone is serious about making good reliable power, a real good cylinder head "guy" is priceless. there are a lot of good guys out there, I have to say that when I was first introduced to what can be achieved with these guys I was stunned 1971ish,. so like a lot of us I began to research and bought books throughout the years to try to understand the BASIC stuff. I remember in one book on "believe it or not" AMC racing program where they cut two different sets of heads in half because one had a great floor profile and the other had room to work the ceiling, and pieced them together and fooled the tech inspections. I will go to my stack of books and get that exact info and print it verbatim when I can. But to my point these guys are so good at what they do it is worth the money. I also realize that many don't have access to this option.