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63corvette · 12-09-2008, 02:08 PM

I used the 23 degree heads with a Ron's Porting Job on them on a 434 a few years ago.
They worked well and flowed better than the Brodix CNC BBC heads.
I had to pull the hood many times to prove the car had a small block and not a big block.
The 434 made almost 850 HP on the dyno and was very reliable with a dart block.
Same combo with a GM block not so reliable. I don't know what the difference in the blocks are but the Dart was much better and a little heavier.
Good Luck with your combo.
My 2 Cents

12-09-2008, 02:08 PM	#2
63corvette Senior Member Join Date: Mar 2007 Location: Canyon, Tx Posts: 553 Likes: 128 Liked 361 Times in 104 Posts	Re: Brodix 18X heads??? I used the 23 degree heads with a Ron's Porting Job on them on a 434 a few years ago. They worked well and flowed better than the Brodix CNC BBC heads. I had to pull the hood many times to prove the car had a small block and not a big block. The 434 made almost 850 HP on the dyno and was very reliable with a dart block. Same combo with a GM block not so reliable. I don't know what the difference in the blocks are but the Dart was much better and a little heavier. Good Luck with your combo. My 2 Cents