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Re: head swap to B1 BS HP gain? [Re: HardcoreB] #574141 01/10/10 05:52 PM 01/10/10 05:52 PM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440 OP
blownzoom440 OP B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH

Re: head swap to B1 BS HP gain? [Re: HardcoreB] #574142 01/10/10 05:55 PM 01/10/10 05:55 PM
Joined: Jan 2003 Posts: 9,982 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,982 Frostbitefalls MN (Rocky&Bullw...	I am far from an expert on blowers, but have some basic understanding of them, having messed with one a bit. If you put a head on that flows ten percent better, and show a large drop in boost, bring the boost back up to 12 lb and the differance should be roughly the same increase in total pressure brought back into the picture. 12 psi boost, plus atmospheric pressure would be 26.7 absolute psi. If you loose 2.67 psi on the head change, then increase the boost back to 12 psi, it might show a 100 hp increase. There are a lot of variables i don't know about on this type of blower, so take it as a WAG. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: head swap to B1 BS HP gain? [Re: gregsdart] #574143 01/10/10 06:01 PM 01/10/10 06:01 PM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440 OP
blownzoom440 OP B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH	Quote: I am far from an expert on blowers, but have some basic understanding of them, having messed with one a bit. If you put a head on that flows ten percent better, and show a large drop in boost, bring the boost back up to 12 lb and the differance should be roughly the same increase in total pressure brought back into the picture. 12 psi boost, plus atmospheric pressure would be 26.7 absolute psi. If you loose 2.67 psi on the head change, then increase the boost back to 12 psi, it might show a 100 hp increase. There are a lot of variables i don't know about on this type of blower, so take it as a WAG. i agree.i am upgrading the heads to gain HP, reduce heat/restriction plus my 346 iron heads are at there limit for putting $$ into.

Re: head swap to B1 BS HP gain? [Re: blownzoom440] #574144 01/10/10 07:34 PM 01/10/10 07:34 PM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440 OP
blownzoom440 OP B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH	its not just that increase in HP for me as i will be turning up the boost to about 1300HP now and then. about 16 psi i would guess. Last edited by METAL STORM; 01/10/10 07:35 PM.

Re: head swap to B1 BS HP gain? [Re: blownzoom440] #574145 01/10/10 07:39 PM 01/10/10 07:39 PM
Joined: Dec 2007 Posts: 12,587 Great Neck,LI,new york hemi-itis I Live Here
hemi-itis I Live Here Joined: Dec 2007 Posts: 12,587 Great Neck,LI,new york	Quote: its not just that increase in HP for me as i will be turning up the boost to about 1300HP now and then. about 16 psi i would guess. HEMI-ITIS has no cure. My condition is fully BLOWN!!

Re: head swap to B1 BS HP gain? [Re: Von] #574146 01/13/10 11:03 AM 01/13/10 11:03 AM
Joined: May 2006 Posts: 14 Alvin, Tx, US B bpattp444 member
bpattp444 member B Joined: May 2006 Posts: 14 Alvin, Tx, US	I run a set of Koffels ported B1/BS heads with the B1 Intake. The ports are bigger than the MW ports. The B1 intake is cut big time. Tube Chassie Truck 2785 LB PG Trans 1.21 60' 5.57 1/8 8.76 1/4

Re: head swap to B1 BS HP gain? [Re: blownzoom440] #574147 01/14/10 12:44 PM 01/14/10 12:44 PM
Joined: Jan 2003 Posts: 524 Mesa, AZ B Bill_T mopar
Bill_T mopar B Joined: Jan 2003 Posts: 524 Mesa, AZ	Quote: i have harland sharp that will work but i need to change the intake rocker to the correct offset and HS sells those.sorry you had problems with the springs,valves... Back in the 90s board member MRMOPAR pretty much ran the combo you are looking at. IIRC it was a .040 stock stroke 440 with Pro Gram Main Caps, a Callies Crank, Ferea Rods, Crower 280R roller with a GMC 6-71 on a Dyers intake with a pair of 850s from the supercharger store (?) and the B1BS heads. I don't believe that the heads were ported at all - just OOTB, and I am not convinced that they did all that much over the iron heads they replaced. In other words, I don't think I would bother without porting them. I believe he still has a set of the special offset B1BS Harland Sharp rockers that he would be willing to unload. Try sending him a PM. Last edited by Bill_T; 01/14/10 12:45 PM.

Re: head swap to B1 BS HP gain? [Re: Bill_T] #574148 01/14/10 03:03 PM 01/14/10 03:03 PM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440 OP
blownzoom440 OP B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH	interesting! thanks. mine will be made to flow as stated in the 330 range so it will be better than the 280 cfm i had from the iron heads. i am sure the new rockers have a better baring now from then.i will check.

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