bbc head comparison - Chevelle Tech
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post #1 of 12 (permalink) Old Apr 19th, 17, 8:44 AM Thread Starter
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Brian
 
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bbc head comparison

What would be the differences other then price and one is iron and one aluminum of these heads?
A world Merlin iron head 119cc 269 intake runner head, or a Brodix race rite 270 intake runner 119cc head?
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post #2 of 12 (permalink) Old Apr 19th, 17, 9:41 AM
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Re: bbc head comparison

Well the Merlin has a raised exhaust port that moves the headers up where the Brodix uses a stock location.

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post #3 of 12 (permalink) Old Apr 19th, 17, 9:58 AM
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Re: bbc head comparison

With the race rite you better be prepared for:

1. Oil all over your engine compartment anytime the valve covers come off
2. Resizing the valve guides (they come with no seals on the Ex)
3. A valve job, as all the machining is horrible
4. Less than great flow, an AFR 265 will rape them

Other than that there great.

Do the work....get the results
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post #4 of 12 (permalink) Old Apr 19th, 17, 10:42 AM Thread Starter
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Brian
 
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Re: bbc head comparison

thanks that's why i asked.

Was thinking if i was going to have someone do my valves, i may want to have some head work done on my 781s while they where at it. Then thought maybe it was just easier to get heads.
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post #5 of 12 (permalink) Old Apr 19th, 17, 11:17 AM
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Re: bbc head comparison

The Merlins also comes with 2.30" intakecvalves vs 2.25" for the race rites.

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post #6 of 12 (permalink) Old Apr 21st, 17, 7:56 AM
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Re: bbc head comparison

Brian, you'd be surprised at how well the 781 do with bigger valves and a nice bowl blend only. Sort of along Mark's logic, I thought if I ever do heads, I;d go AFR, right to the best, or have someone spend $1500 of their time making a lessor casting work.
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post #7 of 12 (permalink) Old Apr 21st, 17, 11:26 AM Thread Starter
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Brian
 
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Re: bbc head comparison

Quote:
Originally Posted by 427L88 View Post
Brian, you'd be surprised at how well the 781 do with bigger valves and a nice bowl blend only. Sort of along Mark's logic, I thought if I ever do heads, I;d go AFR, right to the best, or have someone spend $1500 of their time making a lessor casting work.
I have heard this, but alot of guys i have talked to about it steer me away from my heads. They said I can spend money trying to make the 781's better or I could just go heads already done and be happier. I mean I would rather make my heads better and i guess they really don't need the work LOL.
But i get what your saying, i was looking at the AFR 265 and i can get a set for 2300 or so. Which I could get i suppose but they have 109 cc cambers that's 10cc down from the 781s. I figure isn't that going to bump the compression up? I don't want to do pistons too. I don't want to not be able to run 93 octane.
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post #8 of 12 (permalink) Old Apr 21st, 17, 11:32 AM
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Re: bbc head comparison

I have the Merlins on my 71 Monte. They are more of a well built service replacement for an 049 or a 781 more than anything. Little more iron here and there for strength but they do come with big valves.

My only complaint is this. I'm in Flariduh! Need my ac. I had to grind the snout out of the lower cast ac bracket to clear the headers. Raised exhaust ports.

Couple of junkers and a few clunkers.
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post #9 of 12 (permalink) Old Apr 21st, 17, 11:48 AM
 
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Re: bbc head comparison

Both will make the same amount of power with the correct combination of parts. We are seeing what Mark is seeing also. Valve jobs and guide clearance has to be modified to be correct.

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post #10 of 12 (permalink) Old Apr 21st, 17, 1:38 PM Thread Starter
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Re: bbc head comparison

The only thing that bugs me about the Merlin's is the raised exhaust port. Glad I had asked here, the headers i have just clear the floor pans with the reducer flanges. If it raised the port so my headers sit higher, i wouldn't be able to bolt on an exhaust, i would be into my floor boards. Great that I wouldn't bottom out on my headers thou.
LOL not worried about AC it didn't come with it so no love loss there.
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post #11 of 12 (permalink) Old Apr 21st, 17, 1:42 PM
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Re: bbc head comparison

Quote:
Originally Posted by cstraub View Post
Both will make the same amount of power with the correct combination of parts. We are seeing what Mark is seeing also. Valve jobs and guide clearance has to be modified to be correct.

That's sad coming from Brodix. What do they say?


My 3Xtra CNC heads have done well with no issues. Maybe they spend more time on them?


I am running them with no exhaust seals too....but so far it hasn't been a problem. I figure it can't hurt with the heat of the turbos on them. My old Brodix 2Xtra's were machined for seals as an option when I got them 17 years ago from Brodix. They were always bone dry which I like!!


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post #12 of 12 (permalink) Old Apr 21st, 17, 3:53 PM
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Re: bbc head comparison

have had the brodix 270's sitting on a shelf for a few yrs now not that I don't want to use them just I ordered them with too big a chamber for my current short block. some day I will get a short block to put under them lol. That said I was considering having my 820's renewed and set up to run a hydro roller cam on the current short block. Just been too short on time to find out what that will cost. I think in some cases the aftermarket heads seam like a bargain till yo add everything up on a true case by case setup.

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For Sale: Brodix RR-o 270cc heads, 127cc chamber. Heads they are assembled at this time. I can sell them assembled or not, PM for price. These are new and still in the original boxes. I purchased these bare and had them assembled.
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