SS/JA - What heads are legal? - Page 2

Bob Bender · 11-25-2011, 05:07 PM

Quote:

Originally Posted by K Stubbs

Brian, if you could find a "good" recently done set of stocker heads they may be faster

I have a fresh set............441

Bobby Zlatkin · 11-26-2011, 09:59 AM

Aren't 186 also a correct 300 hp head?

K Stubbs · 11-26-2011, 05:49 PM

I believe the 292 head was available as a production head with straight plugs, which is different from the "turbo" head with angle plugs. The turbo head was not a production head and was originally designed to be used on a turbo indy car engine but was never used, hence the name "turbo" head.

richie 2 · 11-26-2011, 06:17 PM

yes...186 is in that group also.

BRIAN SEATE · 11-26-2011, 06:37 PM

Thanks for the guidance, I will probably go with the 441 version.

Terry Bride · 11-27-2011, 02:46 PM

Quote:

Originally Posted by K Stubbs

I believe the 292 head was available as a production head with straight plugs, which is different from the "turbo" head with angle plugs.

Can anyone confirm this? I believe the 492 was available as a straight or angle plug but I was under the impression that the 292 was an over the counter replacement head and was only available with an angle plug.
Anyone have the straight (or angled) goods on this?

Rich Biebel · 11-27-2011, 07:27 PM

292's were never on any production engine. They were over the counter HP replacement heads. I don't really recall if they were angle or straight plug or possibly made both ways but I am going with straight plug only from my vague memory of them.

Bowtie heads came along and that was it for the Turbos as they were indeed called. They were really not very good unless they were ported but were still better than most stock heads.....

It always amazed me that so many 441 heads were so readily available for race cars. They were made in only one year on 350's and in 1970 there were also some found on 400's but those usually had 1.600 exhaust valves if I recall right.

I dug around for a few sets myself as I once raced a '69 Camaro in SS/JA

The 350/255 was a very good combo from day one......Ask Dave Boertman or Bobby Warren....or Bud Rowe....

Alan Roehrich · 11-27-2011, 08:31 PM

The 492 casting is the service replacement head for the "double hump" (186, 291, 370, 461, 461X, 462, etc) series of heads. It is available in straight or angle plug configurations, only the straight plug configuration is legal in traditional Stock Eliminator and Super Stock combinations.

The 292 casting is an angle plug "race" casting with the exhaust crossover blocked. It was called the "turbo" head because it was made for the Indy car "stock block' program, it is the predecessor to the "Bow Tie" series of heads.

K Stubbs · 11-27-2011, 09:02 PM

"292" – 3917292, or 340292. Both are good performance heads. The 3917292 was
found on 1968 327 and 350 engines, had 1.94/1.50" valves, 64CC combustion
chambers, straight plug configuration, not sure on the accessory holes, and I do not
have any port volume data on these heads. These heads have double hump casting
marks. The 340292 was available from GM "over the counter". This version had angle
plug configuration, 2.02/1.60" valves, 64CC combustion chambers. These were known
as the "Turbo" heads.

The 292 casting is listed as an accepted head on this combo. They are not referring to the over the counter head, there were two different 292 heads.

11-26-2011, 09:59 AM	#12
Bobby Zlatkin Member Join Date: Mar 2003 Location: Mills River, NC Posts: 417 Likes: 0 Liked 0 Times in 0 Posts	Re: SS/JA - What heads are legal? Aren't 186 also a correct 300 hp head? __________________ Bobby & Norene Zlatkin L/SA

11-26-2011, 05:49 PM	#13
K Stubbs Member Join Date: Aug 2008 Location: Benton, Arkansas Posts: 402 Likes: 0 Liked 20 Times in 3 Posts	Re: SS/JA - What heads are legal? I believe the 292 head was available as a production head with straight plugs, which is different from the "turbo" head with angle plugs. The turbo head was not a production head and was originally designed to be used on a turbo indy car engine but was never used, hence the name "turbo" head.

11-26-2011, 06:17 PM	#14
richie 2 Senior Member Join Date: Feb 2009 Posts: 967 Likes: 416 Liked 200 Times in 91 Posts	Re: SS/JA - What heads are legal? yes...186 is in that group also.

11-26-2011, 06:37 PM	#15
BRIAN SEATE Member Join Date: Oct 2006 Posts: 177 Likes: 0 Liked 1 Time in 1 Post	Re: SS/JA - What heads are legal? Thanks for the guidance, I will probably go with the 441 version.

11-27-2011, 07:27 PM	#17
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,314 Likes: 25 Liked 544 Times in 213 Posts	Re: SS/JA - What heads are legal? 292's were never on any production engine. They were over the counter HP replacement heads. I don't really recall if they were angle or straight plug or possibly made both ways but I am going with straight plug only from my vague memory of them. Bowtie heads came along and that was it for the Turbos as they were indeed called. They were really not very good unless they were ported but were still better than most stock heads..... It always amazed me that so many 441 heads were so readily available for race cars. They were made in only one year on 350's and in 1970 there were also some found on 400's but those usually had 1.600 exhaust valves if I recall right. I dug around for a few sets myself as I once raced a '69 Camaro in SS/JA The 350/255 was a very good combo from day one......Ask Dave Boertman or Bobby Warren....or Bud Rowe.... __________________ Rich Biebel S/C 1479 Stock 147R Last edited by Rich Biebel; 11-27-2011 at 07:30 PM.

11-27-2011, 08:31 PM	#18
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,090 Likes: 1,534 Liked 1,758 Times in 398 Posts	Re: SS/JA - What heads are legal? The 492 casting is the service replacement head for the "double hump" (186, 291, 370, 461, 461X, 462, etc) series of heads. It is available in straight or angle plug configurations, only the straight plug configuration is legal in traditional Stock Eliminator and Super Stock combinations. The 292 casting is an angle plug "race" casting with the exhaust crossover blocked. It was called the "turbo" head because it was made for the Indy car "stock block' program, it is the predecessor to the "Bow Tie" series of heads. __________________ Alan Roehrich 212A G/S

11-27-2011, 09:02 PM	#19
K Stubbs Member Join Date: Aug 2008 Location: Benton, Arkansas Posts: 402 Likes: 0 Liked 20 Times in 3 Posts	Re: SS/JA - What heads are legal? "292" – 3917292, or 340292. Both are good performance heads. The 3917292 was found on 1968 327 and 350 engines, had 1.94/1.50" valves, 64CC combustion chambers, straight plug configuration, not sure on the accessory holes, and I do not have any port volume data on these heads. These heads have double hump casting marks. The 340292 was available from GM "over the counter". This version had angle plug configuration, 2.02/1.60" valves, 64CC combustion chambers. These were known as the "Turbo" heads. The 292 casting is listed as an accepted head on this combo. They are not referring to the over the counter head, there were two different 292 heads. Last edited by K Stubbs; 11-27-2011 at 09:05 PM.