Does anyone really know for sure difference in flow and or performance between Chevy 363 18* heads, Brodix 18* heads and the BES 18* heads?

Maybe how they compare to AFR 235 Heads?

I have an aluminum 18* block and the Brodix 18* and a set of the GM 363 18* heads. Also may get the BES if they really are that much better and not advertising bull.

I will be pulling the heads off the motors soon and having them checked out to decide but looking for any real comparisons.

In the right hands they all should be way better than the AFR 235's

When you mention Brodix 18 you gotta be careful what you are comparing. The 18C heads have a lot more potential than the 18X heads.

I would think the BES would be the best of the 3 you mentioned in ootb form becuase they are already custom. But the Brodix 18C or 363gm may be able to be as good or better if done by the right person to fit your combo.

Scott

Thanks, I think the Brodix heads are the 18C but even Brodix did not have much info on them for some reason. Which is also a problem we do not know what the intake angle is on them yet. Brodix uses 3 different angles in the intake side of the 18* heads. I am going to use a Hogans sheetmetal intake and Enderle hat on this motor.

Got one set of heads off, should have other set off this weekend then may be able to figure out what I got.

According to the advertising the BES flow WAY more than the others but that is advertising and would like to know if they really do as they say.

I am not opposed to sending them off to be done if it is worth it.

Bruce I use the 363 head on my my small block and they make really good power ! Pretty much the same combo as you have Injected alky sheet metal intake with two terminators ! I think you will see a big HP increase over a 23 degree head !

A little more information. My new aluminum block is only 406 Cu in. and dry sump. Where my old motor is a 454 with the AFR 235. The 454 is a tall deck Iron Eagle block which is very heavy.
I will be losing about 140 Lbs with the aluminum block and losing some power with smaller cubic inches. By my calculations should be just right with better heads and lighter weight. I am expecting little lower Horsepower but with lower weight should be perfect for my needs. So it is not apples to apples.
Once I get the other set of heads off can flow them side by side and see what I got then make my decision and go from there.
This will all be going into my new altered and leave my Front Engine Dragster complete.

quote:

Originally posted by bill masiello:
Bruce I use the 363 head on my my small block and they make really good power ! Pretty much the same combo as you have Injected alky sheet metal intake with two terminators ! I think you will see a big HP increase over a 23 degree head !

I would like to talk to you about your combination and car. PM me if you can.

Dose the new block have a raised cam ? The reason I say this is when I built mine I went to a 55mm cam and with an alluminum rod I had cam to rod issues and that was with a 3.625 stroke !

Has steel rods and standard cam location but they are like 6.4 inch rods with Honda? journals? Not exactly how I would have built it but good motor.

Got the car over in the shop today and started pulling car apart. The GM 363 heads look really nice and will most likely run them.
Will take them to shop tomorrow to be flowed and checked out but the 363 look nice for sure.

Get it all together and dyno in a few weeks.

Will start wiring the car and the RPM data logger this week.

Then to chassis shop to add rear wing, mount radiator, pump etc.

Curly,
Let me know how the heads turn out. Remember it isn't all about flow numbers. The air speed is critical, it can flow a ton of CFM but be sh*t on the air speed and the heads will never run as they should. I would reach out to Chad Speirs or Darrin Morgan and get their opinion. They are both very approachable and know what they are doing. If you are going through the motor then get everything matched, cam to heads to compression and Cubic inch.

I’ve had a set of GM 363s...ported by Tony At Dart. I went to a set of RFD Monster 15s a s picked up 95Hp with no other change except piston). This was on a 399” deal. I now have a 436” motor with 23* Profilers and it runs within .03 of the 15* motor. Heads have come a long way since GM363’s.

IMO, it all depends on who designs the ports! If you call a major head porting shop, the Brodie C casting is where they will start. There’s no way the 363 head will out perform a BES ported head. Today, if I were ordering heads...it would be MBE’ new 13* head!

I agree with the MBE 13* heads! but I already have these two sets of heads and not spending $15,000 on the new MBE heads right now.

The GM 363 have all Titanium valves and retainers and ports look really nice. With a matched Hogan sheetmetal intake and Jesel shaft rockers. Those will probably be the heads I use on this motor.

I am considering a Dart aluminum 454 block with the MBE 13* heads some day to run E1 with a NA small block but not ready to drop that cash right now.

Combustion chamber size and shape, as well as piston dome size and shape (or the option of hi compression with flat tops) is the big deal with 18-15-14 degree head designs. It ain't all about flow numbers.

I understand it is not all about flow numbers especially when comparing 23* to 18* heads. They say the 18* heads will make more power than a 23* heads even if the flow the same. Still between my two different sets of 18* heads I want to use the set that performs best.
The goal here is to run 4.85-4.90 with out being too hard on parts.

Check them for cracks. The 363s are known to have problems with cracking. I believe the later releases were hipped also.

Rob

WE have made 900HP + with GM 363 .Earliest versions were crack prone.Bill C.

quote:

Originally posted by BIG SPEED:
WE have made 900HP + with GM 363 .Earliest versions were crack prone.Bill C.

I really only need to get 740 out of this motor of course more would be nice.

I never had mine on a dyno but I would say it's about 800 HP ! At 1500 lbs it runs 7.20'S TO 7.30'S AT 181 MPH ! I have also heard about them cracking between the center exhaust ports ! So far mine have been ok !