reporting and resizing heads- how much hp gain?
12-10-2006, 05:12 PM
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reporting and resizing heads- how much hp gain?
have been told I can gain up to 100hp each mill on 850's by doing this without changing reliability at all. anyone have experience.
12-10-2006, 05:55 PM
#4
Re: reporting and resizing heads- how much hp gain?
Originally Posted by JimV
What heads do you have. How much do they flow now? Have they been ported. Who ported them?
Nor Tech 850s straight out of the box I'll bet. Maybe port matched.
100 hp without any other changes would be hard on these motors.
12-10-2006, 06:15 PM
#5
Re: reporting and resizing heads- how much hp gain?
Do you know which Brodix Head? Big Brodie maybe? How big are the motors in CI and are they blower motors? What size primary tubes on the headers.
What makes you say 100hp will be hard on the motors?
What makes you say 100hp will be hard on the motors?
Last edited by JimV; 12-10-2006 at 06:27 PM.
12-10-2006, 07:08 PM
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Re: reporting and resizing heads- how much hp gain?
Yep, blower motors. I would think a cam change would also be needed to take advantage of more flow and gain any real hp.
12-11-2006, 05:58 PM
#7
Re: reporting and resizing heads- how much hp gain?
Originally Posted by JimV
Do you know which Brodix Head? Big Brodie maybe? How big are the motors in CI and are they blower motors? What size primary tubes on the headers.
What makes you say 100hp will be hard on the motors?
What makes you say 100hp will be hard on the motors?
Big Brodie, 598 cid, 14-71 no coolers, Small tube CMIs.
12-11-2006, 06:20 PM
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Re: reporting and resizing heads- how much hp gain?
604 cubic inch block, big tube cmi's , 14-71 bds at 4 lbs boost . have talked to 3 engine builders on oso, they have told me 80-100hp is expected for 750$-1000$ per motor, what do you guys think porting and upsizing would do for me?
12-12-2006, 06:46 PM
#9
Re: reporting and resizing heads- how much hp gain?
Originally Posted by wiggler4490
604 cubic inch block, big tube cmi's , 14-71 bds at 4 lbs boost . have talked to 3 engine builders on oso, they have told me 80-100hp is expected for 750$-1000$ per motor, what do you guys think porting and upsizing would do for me?
Last edited by JimV; 01-25-2007 at 10:11 PM.
12-12-2006, 07:34 PM
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Re: reporting and resizing heads- how much hp gain?
have now spoke with 3 excellent engine builders and it seems this is a great choice to gain hp for the $, extra 250-300hp will push 7-10mph on my top end, thanks
