500EFI Intake modification/adaptation to Pro Flo EFI
11-10-2015 | 07:23 PM
#31
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From: So. Burl. VT.
We fully ported the bottom half opening it up as much as possible, cut the TB mount off the front and made a 3 inch thick one ported the top and radiused the front also opening up the TB as much as possible, all the way to mounting studs. 565cu in. 9.3 comp. Solid roller. 703 ft lbs at 4600. 671 hp at 5800. I still have this intake if you would like to try it.
11-10-2015 | 08:12 PM
#32
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From: Tampa, FL USA
We fully ported the bottom half opening it up as much as possible, cut the TB mount off the front and made a 3 inch thick one ported the top and radiused the front also opening up the TB as much as possible, all the way to mounting studs. 565cu in. 9.3 comp. Solid roller. 703 ft lbs at 4600. 671 hp at 5800. I still have this intake if you would like to try it.
11-10-2015 | 11:14 PM
#33
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From: Spicewood, Texas USA
I built a sheet metal upper for a 500 efi manifold and used 4 2 bbl throttle bodies (scratch built) on a 598. It made 730 hp @ 5600 rpm and best I can remember about 750 ft. lbs of torque. It really layed down after 5600. I ran that for a couple of years, then switched to a Dart tunnel ram with the same throttle bodies. HP jumped to 800 @ 6000 rpm, but lost about 40 ft. lbs. of torque.
Bob Lloyd
Bob Lloyd
11-10-2015 | 11:24 PM
#34
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From: Spicewood, Texas USA
11-11-2015 | 07:48 AM
#35
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From: Tampa, FL USA
11-11-2015 | 07:52 AM
#36
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From: OK CIty, OK
Thanks Eddie. Was looking for a low(ish) budget way to get more air into my cylinders.
11-11-2015 | 05:40 PM
#37
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From: Tampa, FL USA
Thanks Eddie - I looked at Hogans website and a BBC manifold is over $6K with fuel rails for 2 motors. Nice looking though, down here in FL my motors get subjected to salt water. As much as one can do with salt away flushing, the aluminum portion in the water passage would get ate up. One more reason why the 500EFI intake looks appealing.
Last edited by GNJ; 11-11-2015 at 05:47 PM.
11-11-2015 | 08:50 PM
#38
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From: Tennessee
Thanks Eddie - I looked at Hogans website and a BBC manifold is over $6K with fuel rails for 2 motors. Nice looking though, down here in FL my motors get subjected to salt water. As much as one can do with salt away flushing, the aluminum portion in the water passage would get ate up. One more reason why the 500EFI intake looks appealing.
Eddie
11-15-2015 | 07:45 PM
#39
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From: rogers ark
So I have been reading this thread , I have a 540/500efi also that has a " intake manifold " issue also . I have contacted a engine guy in the business that said he has a program that removes the restriction in these , and the throttle body's . I have a dyno sheet that I believe is not accurate that's why I am working on the flow numbers on these . I also looked at changing to hogans intakes but have been advised against it ( from two major boat engine guys ) due to a potential " noise " in the sheet metal that the intakes are made of affecting the timing ?
Last edited by kennyd; 11-15-2015 at 07:48 PM.
11-15-2015 | 09:32 PM
#40
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From: Tampa, FL USA
So I have been reading this thread , I have a 540/500efi also that has a " intake manifold " issue also . I have contacted a engine guy in the business that said he has a program that removes the restriction in these , and the throttle body's . I have a dyno sheet that I believe is not accurate that's why I am working on the flow numbers on these . I also looked at changing to hogans intakes but have been advised against it ( from two major boat engine guys ) due to a potential " noise " in the sheet metal that the intakes are made of affecting the timing ?
