BBC cyl heads

Makinchips · 10-06-2019, 07:13 PM

Has anyone dynoed a closed chamber head versus an open chamber head?
I have an older friend that keeps telling me it's a 50hp gain.
Since i run a 402 in my bracket bomb and wouldn't mind throwing some more power in it I'm hoping someone on here may have some results

10-06-2019, 10:11 PM

Just for ref... find your heads and compare.
http://users.erols.com/srweiss/table...hevy_Big_Block

HP HUNTER · 10-07-2019, 12:49 AM

Quote:

Originally Posted by Makinchips

Has anyone dynoed a closed chamber head versus an open chamber head?
I have an older friend that keeps telling me it's a 50hp gain.
Since i run a 402 in my bracket bomb and wouldn't mind throwing some more power in it I'm hoping someone on here may have some results

Super Stock 396s make 750 HP with 215 heads, so are you utilizing 750 HP @ 131 MPH? Get those closed chamber heads to someone who knows how to work them. :

Example:
396/325 SS/GA 143 MPH @ 3350 = 754 observed HP

Makinchips · 10-07-2019, 10:31 AM

How much rpm would it take to achieve those numbers?
Who does that type of work?
My cyl heads are on the wiess list 291 BBC Mchips.

MAURICE BLENDHEIM · 10-07-2019, 11:07 AM

Jimmy Bridges in Nashville (615) 228-3516, simply "The Best".

Tim H · 10-07-2019, 11:32 AM

SS big block commonly run over .800 lift and utilize every trick in and out of the book to achieve the performance numbers mentioned. I was a bracket racer for more than 30 years and I can tell you that in most cases open chamber is easier to make hp with. The 049 and 781 open chamber oval port heads can run really strong with an upgrade to 2.19" and 1.88" valves and short side radius work. The late great John Lingenfelter proved this many times.

HP HUNTER · 10-07-2019, 10:05 PM

Quote:

Originally Posted by Makinchips

How much rpm would it take to achieve those numbers?
Who does that type of work?
My cyl heads are on the wiess list 291 BBC Mchips.

I was talking oval ports, now 291s are a different world. Bridges would be good, but there are others as well. Some like to forget..............

Makinchips · 10-07-2019, 11:09 PM

Quote:

Originally Posted by Makinchips

Has anyone dynoed a closed chamber head versus an open chamber head?
I have an older friend that keeps telling me it's a 50hp gain.
Since i run a 402 in my bracket bomb and wouldn't mind throwing some more power in it I'm hoping someone on here may have some results

Back to the original questions not straying.
Mark i like the red car in the pic it has nothing to do with the questions posted.

HP HUNTER · 10-08-2019, 07:40 AM

Quote:

Originally Posted by Makinchips

Back to the original questions not straying.
Mark i like the red car in the pic it has nothing to do with the questions posted.

Feel free to call me. You will have to turn RPM to utilize the 291 head. Whats your drive line like? It might be best to build a 4.350 X 3.766 short block.

10-06-2019, 07:13 PM	#1
Makinchips Junior Member Join Date: Apr 2016 Posts: 26 Likes: 0 Liked 3 Times in 3 Posts	BBC cyl heads Has anyone dynoed a closed chamber head versus an open chamber head? I have an older friend that keeps telling me it's a 50hp gain. Since i run a 402 in my bracket bomb and wouldn't mind throwing some more power in it I'm hoping someone on here may have some results

10-06-2019, 10:11 PM	#2
Barry Polley Guest Posts: n/a	Re: BBC cyl heads Just for ref... find your heads and compare. http://users.erols.com/srweiss/table...hevy_Big_Block

10-07-2019, 10:31 AM	#4
Makinchips Junior Member Join Date: Apr 2016 Posts: 26 Likes: 0 Liked 3 Times in 3 Posts	Re: BBC cyl heads How much rpm would it take to achieve those numbers? Who does that type of work? My cyl heads are on the wiess list 291 BBC Mchips.

10-07-2019, 11:07 AM	#5
MAURICE BLENDHEIM Senior Member Join Date: Jun 2011 Location: Langley (no igloos), British Columbia, Canada Posts: 567 Likes: 306 Liked 278 Times in 86 Posts	Re: BBC cyl heads Jimmy Bridges in Nashville (615) 228-3516, simply "The Best". Last edited by MAURICE BLENDHEIM; 10-07-2019 at 11:10 AM.

10-07-2019, 11:32 AM	#6
Tim H VIP Member Join Date: Jan 2007 Posts: 1,040 Likes: 1,064 Liked 481 Times in 158 Posts	Re: BBC cyl heads SS big block commonly run over .800 lift and utilize every trick in and out of the book to achieve the performance numbers mentioned. I was a bracket racer for more than 30 years and I can tell you that in most cases open chamber is easier to make hp with. The 049 and 781 open chamber oval port heads can run really strong with an upgrade to 2.19" and 1.88" valves and short side radius work. The late great John Lingenfelter proved this many times.