Stocl LT1 castings, 290 cfm.. possible?
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Joined: Apr 2001
Posts: 971
From: Colorado
Stocl LT1 castings, 290 cfm.. possible?
Here's some more detail..... apparently on a certain person's heads this was achieved with no welding done to the heads at all, and this flow was achieved between 500 and 550 lift, with higher numbers above that..... any thoughts from some of our resident cylinder head porters and experts.....
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Joined: Oct 2002
Posts: 1,639
From: Toledo, OH
Its probably possible, but not worthwhile. At that point you would have so much air trying to flow through there that you would lose good velocity and definitely screw with the swirl required to make real HP. This is where a good porter comes in, sure I could hog the hell out of the ports and possibly achieve more CFM than them, but they would not WORK near as well as a good porters.
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Joined: Aug 2002
Posts: 1,509
From: Red Oak Texas
I guess it is possible......
like others mentioned,
Alot would depend on how accurate the bench is. A "crazy" valve job that flows good at high lift but destroys EVERYTHING down low might get you close.
To get these #'s from a stock LT1 casting, you would probably need to do a lil welding at the pushrod pinch (and maybe on the roof), change the hardened seats in the heads to accept larger valves, etc.. . . .
all in all, it usually doesn't make much sense to spend this kinda $$$ on a stock casting unless you are in a certain class that requires an LT1 casting. An AFR 210/220 could probably be purchased for about the same $$$ that it would cost to get all of this done. If you are doing the work your self and would just be out the time, it might make sense.
If your set up is serious enough to need all of this and if you are gonna pay $1800-$2500 for some LT1 heads, you would probably be better off with the AFR's.
There again, it is not "impossible", it would be very impressive if the stock seats can be retained, no welding needed and the low and mid lift #'s are still good in the head.
NightTrain66@msn.com
like others mentioned,
Alot would depend on how accurate the bench is. A "crazy" valve job that flows good at high lift but destroys EVERYTHING down low might get you close.
To get these #'s from a stock LT1 casting, you would probably need to do a lil welding at the pushrod pinch (and maybe on the roof), change the hardened seats in the heads to accept larger valves, etc.. . . .
all in all, it usually doesn't make much sense to spend this kinda $$$ on a stock casting unless you are in a certain class that requires an LT1 casting. An AFR 210/220 could probably be purchased for about the same $$$ that it would cost to get all of this done. If you are doing the work your self and would just be out the time, it might make sense.
If your set up is serious enough to need all of this and if you are gonna pay $1800-$2500 for some LT1 heads, you would probably be better off with the AFR's.
There again, it is not "impossible", it would be very impressive if the stock seats can be retained, no welding needed and the low and mid lift #'s are still good in the head.
NightTrain66@msn.com
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