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FE Technical Forum / Had chance to dyno my 390 again
« on: February 13, 2013, 06:08:15 AM »
My son pulled the 394 out of my truck to go in the Galaxie. He left for a day and would tell me where he went. I found out when he came home.
He borrowed a 750 3310 from the guy, but took my Crites 2" headers over and they dynoed it. It has C4AE-Gs I ported that cam out with a higher average from .050-.0550, than a CJ, which I attribute to the excellent valve job based on 45° but had some fairly uncommon angles with it and I worked the short side to the middle. Its a 1999 270S, which had 141° degrees duration at .200 like the other Magnums with lash at .019, My flow numbers were very fat from .200-.550, but were not bragging numbers above that Mario428's Holley SD with a 1" spacer, he is a genius because they matched my heads like a dream. The heads had 2.03/1.56 valves but I had done a lot of rubbing on the heads and they were very quiet on the bench. It was at 37° of timing.
He didn't keep the sheet because I can't read it any way, but it made 438-443 hp from 5600-6200, and 448-454 lbs ft from 3700-4000, the numbers just got there and lofted. with the open Crites. It has been 13 years since I built it, and it pulled the same numbers. I have decided that 4.30's for gears and the C6. Many people have come up with lower numbers on 390's. but mine I guess is just an anomaly. He would not tell me who dynoed it, but the guy was scratching his head and swore it was a 428. He said it pulled like a little monster for what it is from 1800-6200. Something that is ironic is that Tommy-T has given me a 3310 with a secondary metering block conversion to run on it. Good bye Edelbrock, I worked really hard on an 800 AVS converting it to an AFB and tuning it. I don't know what it dynoed, but I expect my 3310 to be quite similar to my latest results.
I feel good putting that motor in now, These were the same number it pulled in 1999! I want a hotter roller-cam engine with 500+ hp, but this one should be fun! It is a combination that came together I guess, I put a lot of detail into everything. And the machine work was done with torque plates, and very precise. So, it should make for a good cruiser!
He borrowed a 750 3310 from the guy, but took my Crites 2" headers over and they dynoed it. It has C4AE-Gs I ported that cam out with a higher average from .050-.0550, than a CJ, which I attribute to the excellent valve job based on 45° but had some fairly uncommon angles with it and I worked the short side to the middle. Its a 1999 270S, which had 141° degrees duration at .200 like the other Magnums with lash at .019, My flow numbers were very fat from .200-.550, but were not bragging numbers above that Mario428's Holley SD with a 1" spacer, he is a genius because they matched my heads like a dream. The heads had 2.03/1.56 valves but I had done a lot of rubbing on the heads and they were very quiet on the bench. It was at 37° of timing.
He didn't keep the sheet because I can't read it any way, but it made 438-443 hp from 5600-6200, and 448-454 lbs ft from 3700-4000, the numbers just got there and lofted. with the open Crites. It has been 13 years since I built it, and it pulled the same numbers. I have decided that 4.30's for gears and the C6. Many people have come up with lower numbers on 390's. but mine I guess is just an anomaly. He would not tell me who dynoed it, but the guy was scratching his head and swore it was a 428. He said it pulled like a little monster for what it is from 1800-6200. Something that is ironic is that Tommy-T has given me a 3310 with a secondary metering block conversion to run on it. Good bye Edelbrock, I worked really hard on an 800 AVS converting it to an AFB and tuning it. I don't know what it dynoed, but I expect my 3310 to be quite similar to my latest results.
I feel good putting that motor in now, These were the same number it pulled in 1999! I want a hotter roller-cam engine with 500+ hp, but this one should be fun! It is a combination that came together I guess, I put a lot of detail into everything. And the machine work was done with torque plates, and very precise. So, it should make for a good cruiser!