Good to hear, couldn't happier as well from the results, advise and service.

Oh Jesus







someone got their panties in a bunch.. relax boys it was just a light hearted joke. Guess some of you don`t have a sense of humor, thats gotta make you a real blast to hang out with.
But since we`re on the subject thank goodness Bob is around I have no idea how guys like Richie Zul or Eddie Young ever put together a motor without it being a turd or grenading itself ...

You guys need to start a Bob Madera fan club.

Here is your update, Valako's head was always aluminum. His R&D was with Dart oval and rectangle port heads. His heads were poured off modified 345 sands. His head is a little over 300cc's, flows over 400 cfm @ 0.650". You need to get into a 335 or 357 CNC AFR @ 0.700 to get the same flow. It is nothing like a modified oval AFR.
Carry on...

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Bad @ss

afr,s 265 oval port head is a good choice for a smaller sized na engine,but it is not going to do so good on a large supercharged engine,it can only flow so much air,then it will hit a wall.imo,a 265 on a 588 inch engine with a large blower would make app 100 hp less than the same engine with the 357 cnc,d head or a dart 355 cnc,d head.on a 454 with a small blower and low boost,the 265 would probibally be a good choice,espically under 6000 rpm.i hope bob m chimes in on this as he is very good at knowing what works and what does not.o i almost forget to say,dan,have a shot of cool aid,LOL.

I find it ignorant and stupid. Sorry! I've read your posts about kissing Bob's ass. I'm not kissing anyones rear, I'm simply passing on the name of someone I respect and has helped out a lot of people build good engines on here.

Rookie-
Good to see the specs on Valakos head. When I was talking to him about heads for my build he suggested his custom Darts, maybe they were Pro 1's, it was a while ago. Either way there was a lot of work that he recommended to have done and at the time I didn't feel it was money well spent on what I was doing. At that time these heads didn't exist.

What are the three heads in the picture?

I was told once by an engine builder that when it comes to forced induction, runner size is less important. The same small high velocity runner that helps aid in low speed airflow (throttle response down low), can also hinder power at upper rpm when being force fed by a blower. The port itself becomes a restriction.

In a maximum effort scenario, you'll find guys running 340+cc runners on 450 inch engines in blown applications . On the street, the smaller runner helps in part throttle and out of boost situations for response and economy. I'd be willing to bet a case of beer, that if you took a blown 454, one with 325 pro 1's, and the other with 270 pro 1's, with a roots or whipple blower, the 325's will outperform the small ovals pretty much throughout the rpm band at wot.

I can tell you in one of my supercharger books, they swapped a gm oval port head, for a gm rect port head on a blown engine. The engine picked up around 60hp at 6000 with no other changes

No, I totally agree with your decision. When the heads were not cast at that time it was cost prohibitive to have that extensive of work done for your build.
1st Oval port dart
2nd Jims cast head
3rd Dart 345

Poor Ramos . All he wanted to do was upgrade some 454 mags lol