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10-06-2019, 07:13 PM | #1 |
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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 |
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Re: BBC cyl heads
Just for ref... find your heads and compare.
http://users.erols.com/srweiss/table...hevy_Big_Block
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Barry Polley 758 A/SA California- No place to race! |
10-07-2019, 12:49 AM | #3 | |
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Re: BBC cyl heads
Quote:
Example: 396/325 SS/GA 143 MPH @ 3350 = 754 observed HP Last edited by HP HUNTER; 10-07-2019 at 12:53 AM. |
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10-07-2019, 10:31 AM | #4 |
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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 |
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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 |
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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.
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10-07-2019, 10:05 PM | #7 |
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Re: BBC cyl heads
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..............
Last edited by HP HUNTER; 10-07-2019 at 10:13 PM. |
10-07-2019, 11:09 PM | #8 | |
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Re: BBC cyl heads
Quote:
Mark i like the red car in the pic it has nothing to do with the questions posted. |
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10-08-2019, 07:40 AM | #9 |
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Re: BBC cyl heads
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.
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