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post #1 of 70 (permalink) Old Nov 27th, 10, 10:17 PM Thread Starter
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Billy
 
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best bbc cast heads

i know there are alot of bbc heads. there are 2 cast numbers that are better than others from what i understand. can anyone give me those numbers. i think 1 of them ends in 290. and think the other is 048? thanks in advance.
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post #2 of 70 (permalink) Old Nov 27th, 10, 11:31 PM
Steve
 
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Re: best bbc cast heads

Quote:
Originally Posted by badbilly21 View Post
i know there are alot of bbc heads. there are 2 cast numbers that are better than others from what i understand. can anyone give me those numbers. i think 1 of them ends in 290. and think the other is 048? thanks in advance.
I am assuming that by better you mean better flowing. I have flowed plenty of factory big block chevy heads, so here it goes. 290 & 049 heads have oval ports. 290s are closed chamber, 049s open chamber. They both flow similar numbers until .400 lift when the 049 head will flow better at higher lifts because of less valve shrouding. This is especially true when 2.19 intake valves are installed. The exhaust is a different story. With either stock or 1.88 valves, they flow identical. There is a compression difference between the two however because of the chamber difference. The same on rectangle port heads. 840s closed, 990s open. They already have the 2.19 intake valve and the 990s flow better at high lift. The exhaust seems different than the oval ports I mentioned earlier. 840s seem to flow better throughout the lift range over the 990s. So which is better? Compression ratio, lift of cam being used, and intended RPM all play a part. If you post what you are building I can steer you in the right direction.
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post #3 of 70 (permalink) Old Nov 28th, 10, 12:00 PM
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Re: best bbc cast heads

Steve'll take care of you, but don't forget 074's.


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post #4 of 70 (permalink) Old Nov 28th, 10, 12:08 PM
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Chris
 
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Re: best bbc cast heads

dont forget the 781 castings they are near identical to the 049 with flow and the open chamber but these open chambered heads are hard to make compression with without the use of a big dome piston.
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post #5 of 70 (permalink) Old Nov 28th, 10, 10:49 PM Thread Starter
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Billy
 
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Re: best bbc cast heads

im building a 396/325 motor for the supercar race series. so im sure they are gonna check the numbers on the heads. i really appreciate your help. how are the 781's???
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post #6 of 70 (permalink) Old Nov 29th, 10, 03:29 AM
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Michael Gekko
 
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Re: best bbc cast heads

I don't think the 396 came with 781s or 049s......if you have to run correct casting number heads you will probably have to run the closed chamber ovals for a 325 hp application.

To add to this, I am building a 68 or 69 camaro to race in NHRA stock and super stock eliminator, using a 396/325 or 396/350 most likely. For those years, as per the NHRA tech bulletins that were supplied by the OEMs back then, the accepted cylinder heads for '68 and '69 were heads with casting numbers ending in 215, 063, 290, and I think one more but can't recall now.

I called Dave Layer of Heads Up cylinder heads and asked him about the flow rates on these heads and which ones were the best choice.....he told me they have done lots of 063s and that there was something a little funky with the 215s.

That conversation was in regards to a super stock application which allows porting and epoxying of the runners as long as factory CC is maintained. For a stock application, where the heads have to be untouched, I would recommend calling people like Steve Koppien in North Dakota, Parsons and Myers racing engines, Bub Whitaker of Burtonsville Performance and Machine in Maryland, Warren Racing Engines in Clinton NC, and perhaps a few others that have considerable experience (and national records) with these applications.

I hope this helps!

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Last edited by Eleanor's Nemesis; Nov 29th, 10 at 03:41 AM. Reason: add on
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post #7 of 70 (permalink) Old Nov 29th, 10, 06:38 AM
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Ron
 
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Re: best bbc cast heads

For Iron Oval Port usng Open Chamber Pistons, I would lean toward the: 3993820, 71, oval, OPEN, 402, 113cc chamber, 255/114 ports also found on the 71-84, 454 Passenger and Trucks.

Less Dome equals Best Chamber Ignition, when reaching for your desired Static Compression.

396's and 427's were Closed Chamber (Not talking about the 366T or 427T Mills which were Open Chamber and mainly Peanut Ports) - It was the 70 454 that introduced Open Chamber to Passenger Cars and the 402 (+.030" 396) went Open Chamber in 71. About the only exceptions were the 265Hp 69 396 112cc Open Chamber 3933148 Casting and the 3975950, 68-70, oval, OPEN, 396, 402 Truck, 366T, 427T Castings.

The 820/113cc, 781/118cc & 049/122cc chambers all Port Flow approx the same and Noted as the Best Flowing Large Oval Ports. Chamber Displacement are know to vary - So you have to CC anyway.

That's my understanding for MKIV Closed Vs Open Chamber Oval Port Iron Castings.

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Last edited by Z15CAM; Nov 29th, 10 at 07:31 AM.
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post #8 of 70 (permalink) Old Nov 29th, 10, 04:25 PM
Steve
 
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Re: best bbc cast heads

If you have to run oval/closed heads the 063 or 290 are nearly identical and flow decent. These have a slightly different quench pad area in the chamber vs. other closed chamber heads. They cc around 100. I don't recall ever flowing 215 castings, so I can't comment on them. I don't know the rules that you have to follow, but bigger valves and porting would really help if allowed. Even better is if you can run the open chamber heads, but like mentioned in other posts I've never heard of them being on 396 engines.
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post #9 of 70 (permalink) Old Nov 29th, 10, 04:50 PM
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Chris
 
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Re: best bbc cast heads

Quote:
Originally Posted by SFR600 View Post
If you have to run oval/closed heads the 063 or 290 are nearly identical and flow decent. These have a slightly different quench pad area in the chamber vs. other closed chamber heads. They cc around 100. I don't recall ever flowing 215 castings, so I can't comment on them. I don't know the rules that you have to follow, but bigger valves and porting would really help if allowed. Even better is if you can run the open chamber heads, but like mentioned in other posts I've never heard of them being on 396 engines.
Have u ever flowed a set of the 702 big oval closed chambered heads?
these were on 66 427 vetts and 66 396 chevelles,Thanks for any info
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post #10 of 70 (permalink) Old Nov 29th, 10, 05:20 PM
Steve
 
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Re: best bbc cast heads

I flowed a pair of 702 heads for a friend of mine about a year ago. He did some bowl work to both ports, nothing extreme, just a clean up. I wish I could have done them stock, but he already did the work. I gave him the flow sheet, so I can't remember all the numbers. I believe they maxed out in the 270's intake and 170's exhaust. Not great numbers, but it is what it is. I remember I couldn't talk him into putting bigger valves in them, so these were 2.06/1.72 valves. Again, I can't say for sure what they flow totally stock. Maybe someone else has flowed some bone stock.
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post #11 of 70 (permalink) Old Nov 29th, 10, 07:21 PM
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Chris
 
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Re: best bbc cast heads

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Originally Posted by SFR600 View Post
I flowed a pair of 702 heads for a friend of mine about a year ago. He did some bowl work to both ports, nothing extreme, just a clean up. I wish I could have done them stock, but he already did the work. I gave him the flow sheet, so I can't remember all the numbers. I believe they maxed out in the 270's intake and 170's exhaust. Not great numbers, but it is what it is. I remember I couldn't talk him into putting bigger valves in them, so these were 2.06/1.72 valves. Again, I can't say for sure what they flow totally stock. Maybe someone else has flowed some bone stock.
how bout with bigger valves and maybe alittle unshrouding do you think they wud pick up in flow?
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post #12 of 70 (permalink) Old Nov 29th, 10, 08:08 PM
Steve
 
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Re: best bbc cast heads

As long as you do the bowl work to match the larger valves also. My experience with the 063 or 290's i mentioned earlier usually flow 290-300 in. 200-210 ex. @ .600 lift with the 2.19/1.88 valves and bowl work. There's more in them but the short-turn needs work. Not hard, just takes more time. Personally, I always put bigger valves in the passenger car heads. With such easy work it's just a shame to leave that airflow gain untapped in my opinion.
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post #13 of 70 (permalink) Old Nov 29th, 10, 08:52 PM
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Chris
 
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Re: best bbc cast heads

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Originally Posted by SFR600 View Post
As long as you do the bowl work to match the larger valves also. My experience with the 063 or 290's i mentioned earlier usually flow 290-300 in. 200-210 ex. @ .600 lift with the 2.19/1.88 valves and bowl work. There's more in them but the short-turn needs work. Not hard, just takes more time. Personally, I always put bigger valves in the passenger car heads. With such easy work it's just a shame to leave that airflow gain untapped in my opinion.

yea ive got a guy here thats a good head porter and has told me he likes to do the short turn radius on the big block heads and i have a set of these heads i was thinkin of using on a 454 ive got to help with compression a bit but i want the flow for sure,Thanks for the info
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post #14 of 70 (permalink) Old Nov 29th, 10, 09:07 PM Thread Starter
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Billy
 
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Re: best bbc cast heads

what about a 496 dressed to look like a 396 in a 69 camaro, want the look of a 396/325 using the right cast manifold and quadrajet carb.
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post #15 of 70 (permalink) Old Nov 29th, 10, 09:54 PM
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Re: best bbc cast heads

I believe you got some very good answers.

Suggest you check this MorTec Site out for whatever you plan to do: http://web.archive.org/web/200805130...ec.com/bbc.htm

Be aware the ONLY 396 Block which can be punched out to a 496 Bore is the 3855961, 396/427, 65-66, 2 or 4 bolt Casting which uses the Groove in the Rear Cam Journal, other words, you have to use either a 427 or 454 block.

All MKIV Mills look identical irregardless of displacement - Unless you get down and Cross reference the Castings and Date Codes you can dress them up to look like whatever you want and no one would know the difference ;o)

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Last edited by Z15CAM; Nov 29th, 10 at 10:07 PM.
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