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915 or 906 Heads #195251 01/16/09 04:37 PM 01/16/09 04:37 PM
Joined: Jun 2005 Posts: 1,534 Florida C CHRGR69 OP pro stock
CHRGR69 OP pro stock C Joined: Jun 2005 Posts: 1,534 Florida	Which are better? And how do you tell the difference with them still on the block? Last edited by CHRGR69; 01/16/09 04:57 PM. Grandma always said I had "hands of gold"!

Re: 915 or 906 Heads [Re: CHRGR69] #195252 01/16/09 04:45 PM 01/16/09 04:45 PM
Joined: Jan 2003 Posts: 3,704 MICHIGAN DynoDave master
DynoDave master Joined: Jan 2003 Posts: 3,704 MICHIGAN	Between the 2, I prefer the 915's for their closed chambers. DynoDave Walter P. Chrysler Club - Great Lakes Region Member # 12304 1970 Plymouth Duster 1972 Dodge Charger Rallye https://wichargerguy.proboards.com/ 1977 Chrysler Cordoba

Re: 915 or 906 Heads [Re: DynoDave] #195253 01/16/09 05:50 PM 01/16/09 05:50 PM
Joined: Feb 2004 Posts: 3,076 Renton, Wa. C Classof70Chally super gas
Classof70Chally super gas C Joined: Feb 2004 Posts: 3,076 Renton, Wa.	If you are going with a 'quench' motor and flat tops then the 915's (closed chamber) are the way to go. If the heads are on the block just pull a valve cover off. The last 3 numbers of the casting number will tell you what the heads are (ie ----915 or ----906, etc).

Re: 915 or 906 Heads [Re: CHRGR69] #195254 01/16/09 09:57 PM 01/16/09 09:57 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	906's cost $60-100 a pair. 915's several hundred a pair & are fairly hard to come by as it was (1)year only(1967) whereas 906's ~ 3 years. If you want a quench motor(smart move) & dont want to step up to one of the alum heads then go with a 915 with the right piston/head gasket. live every 24 hour block of time like it's your last day on earth

Re: 915 or 906 Heads [Re: RapidRobert] #195255 01/16/09 10:18 PM 01/16/09 10:18 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	But if your gonna pay $250-300+ for a set of core heads..Then 400-500+ to rebuilt them...Your well along in buying a set of Stealth heads..

Re: 915 or 906 Heads [Re: 1_WILD_RT] #195256 01/16/09 10:20 PM 01/16/09 10:20 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: But if your gonna pay $250-300+ for a set of core heads..Then 400-500+ to rebuilt them...Your well along in buying a set of Stealth heads.. I would agree live every 24 hour block of time like it's your last day on earth

Re: 915 or 906 Heads [Re: RapidRobert] #195257 01/16/09 10:49 PM 01/16/09 10:49 PM
Joined: Aug 2003 Posts: 777 Washougal,Wa D Dodge super stock
Dodge super stock D Joined: Aug 2003 Posts: 777 Washougal,Wa	Ok, I have to ask. What is quench and can you put 915s on a smogger engine to get the compression up, or are you changing the quench area? If I put 915s on a 10 to 1 compression motor, won't it ping from to high of compression? Stand behind your word

Re: 915 or 906 Heads [Re: Dodge] #195258 01/16/09 11:45 PM 01/16/09 11:45 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: Ok, I have to ask. What is quench and can you put 915s on a smogger engine to get the compression up, or are you changing the quench area? If I put 915s on a 10 to 1 compression motor, won't it ping from to high of compression? Read this.. http://racingsecrets.com/article_racing-10.html

Re: 915 or 906 Heads [Re: 1_WILD_RT] #195259 01/17/09 12:01 AM 01/17/09 12:01 AM
Joined: Feb 2007 Posts: 908 North Chicagoland N newbee69 super stock
newbee69 super stock N Joined: Feb 2007 Posts: 908 North Chicagoland	Quote: Quote: What is quench Read this.. http://racingsecrets.com/article_racing-10.html I was not too sure of this either, but the guys here on the forum explained it to me and this article seems like it hits it right on the head. Not to hijack, but wouldnt all BB and RB's be considered non-quench motors? What would be the advantage? Lower CR? Emission control?

Re: 915 or 906 Heads [Re: newbee69] #195260 01/17/09 12:55 AM 01/17/09 12:55 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	67 & earlier BB had closed chamber heads & could be built as quench engines...Chrysler & GM both went to open chamber heads because it was believed they allowed better combustion but that hasn't shown to be the case, the quench engine offers many advantages...

Re: 915 or 906 Heads [Re: 1_WILD_RT] #195261 01/17/09 10:48 AM 01/17/09 10:48 AM
Joined: Aug 2004 Posts: 1,047 Arizona 6 68CoronetRT super stock
68CoronetRT super stock 6 Joined: Aug 2004 Posts: 1,047 Arizona	Quote: But if your gonna pay $250-300+ for a set of core heads..Then 400-500+ to rebuilt them...Your well along in buying a set of Stealth heads.. My thinking exactly. You'll get the bigger valves, better flow and quench not to mention less weight and the ability to run about 1 point higher compression ratio.

Re: 915 or 906 Heads [Re: CHRGR69] #195262 01/17/09 10:59 AM 01/17/09 10:59 AM
Joined: Jan 2008 Posts: 417 jamestown, ny 71scamp440 Hinged
71scamp440 Hinged Joined: Jan 2008 Posts: 417 jamestown, ny	915's here got the pair fully dressed for $500. 71 scamp big block with 915 heads 727 trans

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