01yellerCobra
forum member
Just when I decide to get rid of my big bore block you're going to make want to build it.
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Just when I decide to get rid of my big bore block you're going to make want to build it.
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Lol. I'm almost tempted.No, you dont need to do that, just sell it to me at .50 on dollar shipped. We all know these blocks are junk anyways.
What kind of numbers are you making?Good luck Billy. Fwiw, I have been to 23-24lbs peak on my BBS so far. I have stock main caps with arp everything, Kellogg 3.800 crank and Manley I beams. I actually just sprayed the wet kit on it for the first time a couple weeks ago as well
What kind of numbers are you making?
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Awesome.
I would flow the Foxlake heads to make a comparison between the two first. If you decide to go with the Foxlake heads then port match them.
As for the question of flow at 24psi, that's a good one. Can a flow bench test at positive psi? I know they usually check at different valve opening but never heard of a positive psi test.
Not that Im aware of, thats why I was wondering if anything changes when the incoming air is under pressure.
Can you flow them with the intake on?
I dont think so.
I would flow the Foxlake heads to make a comparison between the two first. If you decide to go with the Foxlake heads then port match them.
This was my thinking as well when I gutted my heads. Im hoping to flow them on Saturday. If I reuse mine, I will most likely upgrade to 2" headers since I'm being told I have left power and scavenging on the table by port matching my exhaust ports to my headers. If I use the Folxlake heads, I will port match the intake ports to the JPC intake and ported delete plates and leave the exhaust ports alone.A tidbit of "theory". A Centri blower is a true "blower", not a compressor like a PD blower is. So a Centri blower is far more sensitive to airflow efficiency.
If you go with big heads, big cams, big exhaust, big displacement, etc with a PD blower you will see a small increase in power because it will have less parasitic drag (less boost = less parasitic loss). But mostly what you will see is a decrease in boost. Consequently if you go the other direction you will see an increase in boost and a slight decrease in power.
If you go with big heads, big cams, big exhaust, big displacement, etc with a Centri blower you will increase the efficiency of the actual blower unit because it has less restriction to "blow" through. Again, not a compressor.
In simple terms I think you want to use the best flowing heads/best combustion chambers and then port match them to the intake/exhaust. The less restriction you have, the better your blower will work.