Preliminary numbers from my ported LT1 heads
02-23-2005, 05:28 AM
#1
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Preliminary numbers from my ported LT1 heads I started working on an LT1 intake port last week. I did some work thursday, then friday I flow tested it. It got up to 255@.500 and backed up a little above that. Today I did more work on the heads and here are the results.
Aluminum LT1 head
stock 1.94 intake valve with 45° seat angle and a backcut
4.030" test bore
Superflow 600
1/2" radiused clay intake
.200 - 146
.300 - 195
.400 - 231
.500 - 256
.600 - 265
.700 - 266
For that size valve, I think they are pretty good numbers so far...
Aluminum LT1 head
stock 1.94 intake valve with 45° seat angle and a backcut
4.030" test bore
Superflow 600
1/2" radiused clay intake
.200 - 146
.300 - 195
.400 - 231
.500 - 256
.600 - 265
.700 - 266
For that size valve, I think they are pretty good numbers so far...
02-23-2005, 10:27 AM
#3
If that is only a single angle on the seat and with those valves, that is VERY good. Do a 3 angle on the seats and it will probably go up 5 cfm also add some GOOD valves for a gain. The stock valve are junk, no undercuts or swirl polish. Well worth $85 for some decent Stainless cheapies.
02-23-2005, 10:32 AM
#4
I'd say stick with the stock valve sizes. What impress' me is the way the numbers just ramp up after the .200 point. It seems that .240 is the magic point @ .400 on LT1 heads, and it hard to get above without killing the numbers down low (due to port size and velocite, essentially the velocity gets killed). Those look good, and if you can get more go for it. How's the exhaust side of things coming??
