Brodix 18X heads???
 

I am in the process of building a new motor and I am looking at the 18 degree Brodix 18X heads SBC. Has anyone had any experience with these? Difference between 23 degree and these or mabye something else completely. The short block will be a 441 SBC havent bought any components yet other than the block so open to suggestions. Let me know what you think

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

Re: Brodix 18X heads???
 

I've heard very good things about these heads, and considered putting them on my 383 cid small block. But, I was advised against it since that motor only has a stock cast iron 4-bolt block, which wasn't really made to take 750+ hp, which is easily attainable with those heads. The cost difference to put together a motor using those 18° heads vs. a set of standard 23° heads is minimal. So, if you have the block and other components that can take the extra power, I'd go with them.

Good luck, and let us know which direction you go...

Re: Brodix 18X heads???
 

A friend of mine built a 420 using those heads. It made about 740 hp with a t-ram and 2 alcohol carbs. Not a real impressive number by any means. His car weighs close to 3000lbs and has run 9.20's at 143-144 after just a few runs. His best previous numbers were in the 9.50's at about140 using AFR 23 degree heads. The 18x's were not a huge improvement over the 23 degree stuff he had before when you take into consideration the added engine size. There are some very good 23 degree heads out there and probably run as well or better.......

Re: Brodix 18X heads???
 

Such as.................
I'm also considering purchasing the 18X and would like some more information on this topic.

Re: Brodix 18X heads???
 

Thanks for the responses guys. I am going to talk to Brodix at the PRI show this weekend but I always like to hear things from the real racer that have had experience with the product, I have learned through the years that the manufactures sometimes will tell you anything you want to hear! I will post any more info I get on them during the PRI show but I am pretty sure that these are the one I am going to go with. Everything I have heard about these has been great as long as you use a aftermarket block.

Re: Brodix 18X heads???
 

Are you looking at the standard or spread port?

Re: Brodix 18X heads???
 

Well let me tell the whole story this motor is for my new car I built for H/R I would probably be looking at the spread port but the problem is that 6 months ago I bought a $700 set of STD port headers for the motor out of the other car and I am not sure if I want to buy another set of headers for the spread port the difference between the two would have to justified. "Probably the ones that would make me run more inconsistent" right since I will be joining you on the H/R circuit next LOL...

Re: Brodix 18X heads???
 

I built a 405 cube engine using a set of Brodix raised runner/spread port-10's that were WeldTech ported. That engine was very strong. I built a similar sized engine years later using -12's with very large intake runners. It never ran up to expectations. I have an engine in my garage now that is a pretty strong running 400 and it has ProAction 220 aluminum heads on it. I also built a 375 cube engine using AFR 220's and ported them myself. That engine ran 9.00 at 150 in an early Camaro with a Ron's toilet. That car was pretty light......

Re: Brodix 18X heads???
 

427" SBC. Trick Flow 18 degree heads. 715@7200 Heads are bone stock out of the box, was told that with a good port job and the right cam it would make well over 800. I am very happy with the product.

Re: Brodix 18X heads???
 

After reading this and other posts, I'm wondering what's wrong with my motor! With posted HP running from 650-850 and my 421 is only making 596 HP at 6700 rpm, are the 18 deg heads worth that much of a difference? Or is it in the combo, motor was built by Ohio Crankshaft and I wasn't real pleased with that whole deal but that's water under the bridge.

Re: Brodix 18X heads???
 

My 434 with the Brodix 23 degree heads that made almost 850 HP on the dyno was a 14.8 to 1 compression ratio. Comp Cams small base circle with almost .800 lift. (1.5 & 1.7 Ratio Rockers)
It made its HP from 5400 to 7200 RPM
It was all in the flow of the Heads and manifold that Ron's Porting Service did. He actually cut the heads to about 21 degrees.
They flowed 440 CFM and I had to use a worked Gary Stinnett 1050 Holley to get it to work. I started out with a 950 and that just was not enough. The engine would just labor. When I changed carbs it really came to life.
The car weighed 2435 with me in it and would run 8.70's at 155 to 160 at sea level.
My 2 Cents

Re: Brodix 18X heads???
 

Bob,

Without knowing what the heads flow, compression ratio, cam, etc. There is no way to tell why your motor is down on power, but one thing is for sure, that thing has to spin higher, if it is not making any power past 6700 there is your problem.

Re: Brodix 18X heads???
 

The heads are Dart pro 1 with 215 int runners, comp ratio is 14 to 1, the cam is the small base with a 679 /645 with the 4 and 7 swap intake is Dart with an 850 holley. I have been shifting at 6900 and going through the traps at 7100 to 7200. I'm still wondering if this carb is big enough?

The cam was supposed to be 5000 -7500...............Motor was new at the end of last year....

Re: Brodix 18X heads???
 

I would look at the carb and check your valve springs.
If I noticed my 434 getting a little lazy I would look at the valve springs and usually they were a little weak.
When I tried to run the 950 carb my 434 would not hardly get to 7000 RPM.
My 2 Cents

Re: Brodix 18X heads???
 

Well arrived at the PRI show today I will be talking to all of the manufactures and will post some results next week sometime, as far a carb I run a 1435 terminator with a O 1/2 pump on my small 396 which is very consistant and I was told that with the new combo and bigger heads that I may need the 2100 CFM model guess you can never have enough air the motor it will only use what it can take. When I was told that I needed the 1435 for the 396 I thought that the guy was nuts I figured that it was way to big for my combo but was way wrong when the car picked up almost 2 tenths and became much more consistant from a good 850 methanol carb.

Re: Brodix 18X heads???
 

Bob I sent you a pm
rod

Re: Brodix 18X heads???
 

I have a 434 with a set of Brodix 18c heads that are cnc machined and they are spreadport, titanium valves and t&d shaft rockers, 704 lift cam 14-1 compression with a 1050 carb with a dart block . It made 757 hp @ 7000rpm ,on the stop it goes 10.90 @140 in a 2950 lb car it was a big improvement over my 23 degree heads i had before when it went 10.90 @ 130with the same cubic inches was told i was undercamed my the machine shop it needs about 800 lift and would be over 800hp if i would change it but this combo is very consistant i would recommend Brodix and 18 degree heads to anyone that asks

Re: Brodix 18X heads???
 

I picked up 30 hp on the dyno by increasing the size of my Race Demon RS from an 825 cfm version to 975 cfm. Every simulation I have run has shown that I should run as big of a carb as possible on my 383. This motor made 630 hp with a 4-7 swap cam and AFR 210 CNC ported heads. Nothing really exotic. I go through the traps at 7800 rpm.

Re: Brodix 18X heads???
 

I have a set of 18X's on a 406 with a small .704/.704 277/284@.050 cam...motor made 681 on a really conservative dyno. Pushes our 2280lb Monza to a best 5.59's at 124mph using a 1050 Pro Systems gas carb