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Originally Posted by F-2 Speedy
(Post 4941192)
Why were those gigantic holes cut in the transom
https://cimg5.ibsrv.net/gimg/www.off...b50cea0c57.jpg |
Yes, precisely. We opted for a conversion plate system to switch from the old TRS footprint to the Bravo setup.
I am fully aware that the 'plates vs. filling the transom' topic is a subject of endless debate in the community. However, we made a very conscious decision to go down this route. When we stripped the rigging, we found the original transom core to be in exceptionally good condition—it was bone dry and rock solid. We decided it was better to preserve that original factory structural integrity rather than performing invasive 'transom surgery' when it wasn't technically necessary. The system has been absolutely rock solid and trouble-free for us so far, so we are happy with the decision. |
Guys, you are steering me in a very exciting direction here. Thanks again for diggin in!
The Brodix 'Race-Rite' Revelation: I looked up the specs for the Brodix Race-Rite BB-3 XTRA O based on your recommendations, and I found something very interesting in their 'Easy Order' chart (see attached screenshot). They actually list specific part numbers (e.g., 2068123) that come with 115cc chambers right out of the box. My Conclusion / The New Plan: If Brodix offers them at 115cc, that tells me there is plenty of 'meat' on the deck to mill them safely. Since the Edelbrocks are unobtainium anyway, my plan is now shifting to this Brodix Custom Approach:
Cheers, Stefan |
https://cimg4.ibsrv.net/gimg/www.off...0825e94f14.jpg
Originally Posted by Tartilla
(Post 4941189)
AFR 290s have 112cc chambers. The 3/8" raised exh ports...raise them at a 45° angle when mounted on the block. 265cc BBC heads would be a great choice too. Thanks for digging up the specific AFR stats! Those 290cc heads with the 112cc chamber option are definitely a 'tasty' choice technically. Under different circumstances, that would be my go-to to save on the machine work. However, looking closer at my exhaust setup (see attached pics), I think the AFRs might cause me a headache during installation: I am running stainless CMI-style headers with fairly rigid plumbing through the transom. I don't have long soft rubber couplers that could easily absorb the ~.375" raised exhaust port height of the AFRs. I am worried that the higher port location would put the whole system under tension or cause alignment issues at the transom rings. That’s why I am leaning so heavily towards the Brodix Race-Rite: The guaranteed 'Stock Exhaust Location' is a huge safety factor for my rigging. I'd rather spend the extra effort on milling the Brodix heads than fighting with exhaust alignment later on. I guess, I’ll stick to the Brodix plan for now to keep it a clean bolt-on process. |
Are Bravo XRs OK for 550hp with the level of torque you are intending?
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Originally Posted by stefan572
(Post 4941247)
Guys, you are steering me in a very exciting direction here. Thanks again for diggin in!
The Brodix 'Race-Rite' Revelation: I looked up the specs for the Brodix Race-Rite BB-3 XTRA O based on your recommendations, and I found something very interesting in their 'Easy Order' chart (see attached screenshot). They actually list specific part numbers (e.g., 2068123) that come with 115cc chambers right out of the box. My Conclusion / The New Plan: If Brodix offers them at 115cc, that tells me there is plenty of 'meat' on the deck to mill them safely. Since the Edelbrocks are unobtainium anyway, my plan is now shifting to this Brodix Custom Approach:
Cheers, Stefan I don’t know about these specifically but I know some aftermarket heads typically have a 0.500” deck thickness. |
Originally Posted by Poker Face Xtreme
(Post 4941278)
Are Bravo XRs OK for 550hp with the level of torque you are intending?
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Originally Posted by stefan572
(Post 4941248)
https://cimg4.ibsrv.net/gimg/www.off...0825e94f14.jpg
Thanks for digging up the specific AFR stats! Those 290cc heads with the 112cc chamber option are definitely a 'tasty' choice technically. Under different circumstances, that would be my go-to to save on the machine work. However, looking closer at my exhaust setup (see attached pics), I think the AFRs might cause me a headache during installation: I am running stainless CMI-style headers with fairly rigid plumbing through the transom. I don't have long soft rubber couplers that could easily absorb the ~.375" raised exhaust port height of the AFRs. I am worried that the higher port location would put the whole system under tension or cause alignment issues at the transom rings. That’s why I am leaning so heavily towards the Brodix Race-Rite: The guaranteed 'Stock Exhaust Location' is a huge safety factor for my rigging. I'd rather spend the extra effort on milling the Brodix heads than fighting with exhaust alignment later on. I guess, I’ll stick to the Brodix plan for now to keep it a clean bolt-on process. So exhaust manifolds between engines... would lose 0.265" × 2. 0.530". |
Originally Posted by hogie roll
(Post 4941280)
Dont you want to remove 5 x .005” to remove 5CCs?
I don’t know about these specifically but I know some aftermarket heads typically have a 0.500” deck thickness. |
109cc on the AFR 265
https://www.airflowresearch.com/265c...nder-head/p603 https://cimg3.ibsrv.net/gimg/www.off...1154ee5e59.png That is a tiny head and valve that gives up a lot of flow up top though. |
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