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lq4 with prc as cast 225

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Old 08-13-2014, 03:09 PM
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Default lq4 with prc as cast 225

I am getting ready to buy a set of heads and was wonding what kind of power these heads would make with a super Victor and 950 carb? Haven't decided on a camshaft yet.
Old 08-13-2014, 03:13 PM
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Gonna put this in a 81 Malibu that weighs 3300lbs with 4.10 gear and 4000 converter. Any 1/8 th mile track predictions? I wanting to run in the 6's na on pump gas
Old 08-13-2014, 03:57 PM
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Welcome to the carb section jonz. While I have never tried those heads personally, if PRC has their name on them, I would run them.

As for making 6s in the eighth at 3300 pounds with a good set of heads, EASY. My car is 3700 pounds and I have PRC CNC ported factory 799 castings, smallish 226/234 cam, Vic Jr., 4000 stall. My car goes 7.0s in the 1/8 on the motor.
Old 08-13-2014, 05:01 PM
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Ya I have been looking at the Ls6 2.5 also which sounds like what u got. And then ive thought about ls3 stuff but I think that big of runner size will kill all the torque
Old 08-13-2014, 07:26 PM
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Originally Posted by jonz
Ya I have been looking at the Ls6 2.5 also which sounds like what u got. And then ive thought about ls3 stuff but I think that big of runner size will kill all the torque
I actually have the Stage 1 CNC LS6 heads. As for the square port stuff, you can get it done with those no problem too. It just depends on what you are doing. If you are using a stock junkyard short block, there are some advantages to running the cathedral port stuff. If you are going to build the bottom end with forged pistons, I would say it is a coin toss.
Old 08-13-2014, 08:54 PM
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Ya bottom end is stock besides rod bolts
Old 08-13-2014, 08:55 PM
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JJust dont want to fly cut pistons
Old 08-13-2014, 09:18 PM
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I would go with some cathedral ports with small chambers then. What size chambers are available on the PRC as cast? What is the valve drop on those do you know?
Old 08-13-2014, 10:00 PM
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62 cc and Idk bout drop but they change valve angle to 13 for more ptv



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