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Old 11-27-2012, 02:39 PM   #1
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1250cc heads. How much more can they flow

Over the winter my project is to install my BOSS NOSS system but talking to a few people it's been said I can make a big power change on head work. I already have Screamin Eagle II cams installed SO does anyone know what the heads flow with the cams & how much more can I flow? From what I read the factory heads are already C & C ported?
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Old 11-27-2012, 02:56 PM   #2
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Easy answer is YES, you can make them flow much better. How much more power you can get varries from bike to bike, supporting mods, tune, ect. The heads are definatly not CNC from factory. (Only the SE heads were CNC) The 08 and later 1250cc heads are all sand cast.

I think Fitzgerald still offers CNC headwork, you will have to contact them to inquire about potential gains. You will probably also a require larger throttle body. With shipping, throttle body, tune and everything, you are probably looking in the $3k range for maybe 10-20 hp gain.
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Old 11-27-2012, 03:22 PM   #3
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600-800 for head work for 3-5 hp not worth it.


just add the NOS and be done.

Keep the 53 mm TB's for now.

if you go BB the go to 58's
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Old 11-27-2012, 03:30 PM   #4
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I agree with RSC on this one, even though with my big bore I port polished and had over sized valves put in, but if your just putting in NOS no sense it stripping the motor to just have head work done.

64mm Throttle body?!? What the head would he need that for?? Most that big bore them only go up to 58mm.
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Old 11-27-2012, 04:07 PM   #5
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I agree with RSC on this one, even though with my big bore I port polished and had over sized valves put in, but if your just putting in NOS no sense it stripping the motor to just have head work done.

64mm Throttle body?!? What the head would he need that for?? Most that big bore them only go up to 58mm.
Go big or go home right? The 58mm destroyer tb would probably be fine, but 64mm just sounds fun



What size BB did you do? Any chance you did a before and after dyno on your P&P ? I still have the stock 53mm on my 1350.
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Old 11-27-2012, 04:46 PM   #6
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Go big or go home right? The 58mm destroyer tb would probably be fine, but 64mm just sounds fun



What size BB did you do? Any chance you did a before and after dyno on your P&P ? I still have the stock 53mm on my 1350.
That's like putting a Dominator carb on a small block Chevy. Bigger is not better. You might make more peak hp, but torque and driveability will suck.
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Old 11-27-2012, 05:10 PM   #7
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That's like putting a Dominator carb on a small block Chevy. Bigger is not better. You might make more peak hp, but torque and driveability will suck.
69 Camaro with small block with a 1050 dominator carb. Bracket car and runs amazing.



Since he is running nitrous, the larger tb may be better. I cant tell you how many small block nitrous motors I have seen running up to 1400cc carbs. (usually in the 1050-1100 range though).
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Old 11-27-2012, 05:35 PM   #8
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Few people I talked to the 53mm TB's at full sing don't max out on flow. with nitrous you don't need a bigger TB (Or carbs for some) because N2O is it's own source of oxygen. If your primarly racing were your wide open more then part throttle I can see bigger TB's being a advantage. As for head work I would of hoped the heads would be C & C ported then casted. Maybe just removing them and polishing the ports might give good results?
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Old 11-27-2012, 05:37 PM   #9
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69 Camaro with small block with a 1050 dominator carb. Bracket car and runs amazing.



Since he is running nitrous, the larger tb may be better. I cant tell you how many small block nitrous motors I have seen running up to 1400cc carbs. (usually in the 1050-1100 range though).
Don't show me no race car... he rides on the street. You gotta be kidding me.
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Old 11-27-2012, 05:48 PM   #10
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Ever notice how those 1000-1400 cc carbs on small blocks idle like crap too. you have to "burp" the throttle to keep it running. I think even Big Bore kits you can get away with the 53mm . For the cost of heads a Big Bore might give better results for the cost
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Old 11-27-2012, 06:01 PM   #11
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It is so easy to overcarbuerate. When I built the 355 for my truck, I originally had a Holley 780 carb... ran strong, but was sort of flat in the mid-range. I downsized it to a 670 Street Avenger, and the motor came alive.

If I was building a motor for my V, since I have an 1130, I'd go with my original plan to use a Destroyer crank, CP pistons at a 1250 bore, and have a 1302. I sold all the parts when I went turbo, but that's what I'd do.
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Old 11-27-2012, 06:19 PM   #12
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Quote:
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It is so easy to overcarbuerate. When I built the 355 for my truck, I originally had a Holley 780 carb... ran strong, but was sort of flat in the mid-range. I downsized it to a 670 Street Avenger, and the motor came alive.

If I was building a motor for my V, since I have an 1130, I'd go with my original plan to use a Destroyer crank, CP pistons at a 1250 bore, and have a 1302. I sold all the parts when I went turbo, but that's what I'd do.
So a 1250 with a Destroyer crank and CP pistons would be??
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Old 11-27-2012, 06:57 PM   #13
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Those oversized TBs from Vreelands are for track only anf for their equally obscene BB motors (LOL) not for the street!
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Old 11-28-2012, 09:26 AM   #14
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Those oversized TBs from Vreelands are for track only anf for their equally obscene BB motors (LOL) not for the street!
I heard him start up one of his 1402 BBs with that massive TB when I was at Vreelands. It was deafening.... but sexy all at the same time.
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Old 11-28-2012, 11:34 AM   #15
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I heard him start up one of his 1402 BBs with that massive TB when I was at Vreelands. It was deafening.... but sexy all at the same time.
What?!?!
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