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Ok, we need a new thread: quench

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Old 11-18-2015, 09:39 AM
  #41  
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Originally Posted by donzi matt
If you really want to wring it out, have you given any thought to putting closed cooling on them and going to aluminum heads?
Yes, I have considered it. I haven't pulled the trigger on anything, as I am trying to pull together what I want to do as a full combination.

I know the 311 is never going to be a fast hull compared to the hulls with the newer technology out there, so I am not going to go too wild with horsepower and the money associated with it.
There aren’t a lot of options for iron heads, but the 308 eagles have a smaller intake volume than the 088/188s and are very similar to the Dart Pro 1 310 aluminums. I think those, a little more compression, victor jr intake, and more cam to suit would be a nice horsepower increase.

Things can blow out of proportion easily on the site (especially this time of year) but I appreciate everyone’s advice and take it into consideration. I’m not trying to set a world record on the most hp/ci of a BBC, but my initial thought was 550hp @56-5700rpm. If it doesn’t make it, ok, but either way it will make more power.

So regarding the quench & compression, based feedback here, I am thinking of using the .027 cometic gaskets and am shooting for 9.0-9.2:1 compression. I plan to have the heads milled to meet the compression number, and everything will be measured.
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Old 11-18-2015, 09:51 AM
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Originally Posted by MILD THUNDER
Is the 308 the ideal head for what youre doing , eh, no. Would you do better witha smaller oval like the dart 275 , afr 265, trick flow 270, etc, im sure. How much, idk.

I do know, the average 489/496 stroker marine build, 89 octane setup, with a decent set of aftermarket heads, roller cam, usually do 575-600hp.
Totally agree. A smaller oval would be better. After all this head talk, it seems like the only application for an intake over 300cc would be some sort of 800+ ci mountain motor at 10krpm..(I'm kidding!! )
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Old 11-18-2015, 11:27 AM
  #43  
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Ok Mr Maine. You know and knew where you had to go, many very good responses in this thread...so, is it done yet ? LOL.
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Old 11-18-2015, 11:45 AM
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Originally Posted by SB
Ok Mr Maine. You know and knew where you had to go, many very good responses in this thread...so, is it done yet ? LOL.
SB, yup, she's all done and back together. I ended up spraying a 400hp shot of nitrous to meet my hp goals!!!!

In all seriousness, I am on track and am that much closer putting my final plan together and ordering parts.
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