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Formula 271 extension box
Does anyone run one on this bout, and do I go std or lift:confused:
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I guess ill shake the majic 8 ball:crazy:
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Did you call Formula ?
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Yes, and they had done no testing and wouldnt even give me an educated guess on height, gains, overall performance etc. They actually told me to check here on OSO, but obviously I tried that first.
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I assume your talking about an
Imco box. If your using the exsisting cutout, you should go with the 3 " raised, otherwise, you effectively lower the X. But, you have to raise the motor mounts :( |
Originally posted by formulaz583 Now if I could get the thing to stop torking over to the right, so I don't have to drag that tab, I'd be VERY happy. |
See I always said fat chicks are good for something :p
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Originally posted by formulaz583 I knew that post was gonna get read wrong.(because I typed it wrong) They aren't 500 HP's, I meant to say Its a 502 mag that has been rebuilt and dynoed in the 590 HP range with the flame arrestor on it. 612 torque. Now if I could get the thing to stop torking over to the right, so I don't have to drag that tab, I'd be VERY happy. Are you using the stock efi intake setup or is it carbed? What prop and rpm are you running? The guy that built my last engine (502 efi) said the stock intake wont make much more than 500 hp, and my extrude honed manifold about 20 more. I was hoping to see 75 with the 600 hp 540 Volvo (Innovation). Does it still lean at speed? My boat kinda levels off up top, still needs the tab at neutral with the port tab up. I just put a set of 23" tabs from Livorsi on it. The box was just a concideration as I stripped the transom assy off and figured now is the best time if I am going to do it. I really dont think 25-3000.00 is "too much to spend on a 271" if the performance gains were there. All things being equal I will go back with the new hp transom and no box....I'll save the money for a new drive if this one doesnt hold up. |
Originally posted by formulaz583 I knew that post was gonna get read wrong.(because I typed it wrong) They aren't 500 HP's, I meant to say Its a 502 mag that has been rebuilt and dynoed in the 590 HP range with the flame arrestor on it. 612 torque. Now if I could get the thing to stop torking over to the right, so I don't have to drag that tab, I'd be VERY happy. Are you using the stock efi intake setup or is it carbed? What prop and rpm are you running? The guy that built my last engine (502 efi) said the stock intake wont make much more than 500 hp, and my extrude honed manifold about 20 more. I was hoping to see 75 with the 600 hp 540 Volvo (Innovation). Does it still lean at speed? My boat kinda levels off up top, still needs the tab at neutral with the port tab up. I just put a set of 23" tabs from Livorsi on it. The box was just a concideration as I stripped the transom assy off and figured now is the best time if I am going to do it. I really dont think 25-3000.00 is "too much to spend on a 271" if the performance gains were there. All things being equal I will go back with the new hp transom and no box....I'll save the money for a new drive if this one doesnt hold up. |
IF YOU GO WITH THE IMCO RAISED 3 INCHES YOU NEED TO RAISE THE MOTOR 3 INCHES HOPE YOU HAVE THE ROOM FOR THAT
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