Are you going with a 2.300 intake valve? I can't remember what RPM range you wanted, and how "spirited" you wanted to get
with the dragonslayer heads, you only have two choices, 320cc ports with 2.25" valves, or 365cc ports with 2.30" valves. Since the former would be waaaaay too small for a 632cid build, I would choose the latter. As Mr. Foxwell advised me, 2.37" valves are the ideal for a 632 mill, but since I'm planning on keeping the RPM below 6,500 I'm willing to compromise with 2.30" valves. Especially since the two intake manifolds I've chosen to play with, (ie. The BMP "Merlin-X" single plane and the Edelbrock Super Victor TD 2916 ) are both very likely compromises above 6,000 RPM on a 632 engine anyway. So either manifold would undoubtadly be the weak link or the bottle neck holding back the power delivery even if I did decide to choose a head with a 2.4" or even a 2.35" intake valve.
But the intake manifold compromise is needed to contain this whole engine combination inside a OE type cowl induction hood that I have on my 70 Chevelle, while still being able to use a Dominator carb, with a 16" diameter, 3.5" tall air filter element and there is just no way I would cut a hole in that hood, nor choose one of those aftermarket fugly eye sores that are called a 4" or a 6" cowl hood since they just ruin the entire look of a classic car body style. IMO you might as well race or drive a 1980's Camaro, or Fox body mustang since they have ugly body styles anyway. But NOT on my Chevelle. I'd rather leave power on the table than slap one of those abortions on my Chevelle. Sorry for being so outspoken on that, but since this is my car we're talking about here, it's my right.
The Brodix heads I have used was avaible with cnc chambers as option maybe the dragonslayer heads are too? Check with Mike Lewis.
I spoke to Mike Lewis, and the man gave me a better price quote on the Dragonslayer heads than you would ever find anywhere else, short of lucking out and finding a pair either new in the box that someone is selling for a song and a dance due to something like a job loss due to the corona virus hysteria, (
) or a set that is barely used at all being sold due to a similar hardship reason.
But anything short of lucking out like that, Mike Lewis is the man to go to for these, yes.
But as far as what Brodix offers, you shouldn't have to pay extra for CNC chambers to have a set of heads with the entire chamber surface machined, because that is not the case with the rest of the brodix BBC heads. So I don't understand why it is with these dragonslayer offerings. They're a little less expensive, sure, but they're still not cheap by any standard. Just take a look at what Summit and jegs sells them for if you don't believe me on that. They're still more expensive than many of the edelbrock heads for instance as well as many of the Dart heads too.
Originally Posted by cuisinartvette
I stopped polishing chambers, bad habit I guess. Probably run the same either way.
Thanks for your insight on that. But have you ever seen or had BBC heads with chambers like those shown in the two pics I posted, with half the chamber surface still cast, and the other machined? I've never seen this before. Very strange.