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B1 Original Vs B1 MC #1080724 09/23/11 03:10 AM 09/23/11 03:10 AM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer OP master
Bob_Coomer OP master Joined: Nov 2003 Posts: 6,293 Rock Springs	How can you tell the diff between the two? What part number is P4349600? I see on the end of the head it says MC... There is a casting on the end of the head also of B970.. [color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

Re: B1 Original Vs B1 MC [Re: Bob_Coomer] #1080725 09/23/11 03:11 AM 09/23/11 03:11 AM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer OP master
Bob_Coomer OP master Joined: Nov 2003 Posts: 6,293 Rock Springs	Also is the pistons diff between the two? [color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

Re: B1 Original Vs B1 MC [Re: Bob_Coomer] #1080726 09/23/11 10:46 AM 09/23/11 10:46 AM
Joined: Jan 2003 Posts: 19,355 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,355 Las Vegas	Not sure on the part number thing. The difference is the intake valve is moved slighlty to allow for a bigger intake valve. In terms of flow from what I have seen there is about a 30cfm difference between the two heads.

Re: B1 Original Vs B1 MC [Re: Al_Alguire] #1080727 09/23/11 11:48 AM 09/23/11 11:48 AM
Joined: Nov 2003 Posts: 10,384 Upstate NY Bigcube I Live Here
Bigcube I Live Here Joined: Nov 2003 Posts: 10,384 Upstate NY	No B1 expert here but I thought they were the same casting, they just machined the valve location in a different spot. Jim

Re: B1 Original Vs B1 MC [Re: Bob_Coomer] #1080728 09/23/11 12:13 PM 09/23/11 12:13 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	I would believe that the valve pockets in the piston is bigger for the 2.4" valve in the M/C head... normally you run .1 bigger than the valve so the pocket would be 2.4 for the B1 original and 2.5 for the M/C... same castings with the M/C intake moved .050(I believe it is)

Re: B1 Original Vs B1 MC [Re: MR_P_BODY] #1080729 09/23/11 02:47 PM 09/23/11 02:47 PM
Joined: Jun 2007 Posts: 103 NEW JERSEY BIGSPEED member
BIGSPEED member Joined: Jun 2007 Posts: 103 NEW JERSEY	The exhaust valve is moved .050 towards the wall to allow a .100 larger intake. Center punch the piston down the guide at 10 degrees before or after. Use a compass to sweep the reliefs you have to see where you are at. Set compass at half valve size. If you have B-1 pistons in it you may not have to do much to the reliefs if the piston manufacturer was a little generious with his cutter. Frank

Re: B1 Original Vs B1 MC [Re: BIGSPEED] #1080730 09/23/11 03:08 PM 09/23/11 03:08 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: The exhaust valve is moved .050 towards the wall to allow a .100 larger intake. Center punch the piston down the guide at 10 degrees before or after. Use a compass to sweep the reliefs you have to see where you are at. Set compass at half valve size. If you have B-1 pistons in it you may not have to do much to the reliefs if the piston manufacturer was a little generious with his cutter. Frank Its the exhaust that moves... thanks for that info... I thought it was the intake... I sold my B1M/C heads so I dont have them anymore to look at

Re: B1 Original Vs B1 MC [Re: MR_P_BODY] #1080731 09/23/11 05:24 PM 09/23/11 05:24 PM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer OP master
Bob_Coomer OP master Joined: Nov 2003 Posts: 6,293 Rock Springs	Quote: Quote: The exhaust valve is moved .050 towards the wall to allow a .100 larger intake. Center punch the piston down the guide at 10 degrees before or after. Use a compass to sweep the reliefs you have to see where you are at. Set compass at half valve size. If you have B-1 pistons in it you may not have to do much to the reliefs if the piston manufacturer was a little generious with his cutter. Frank Its the exhaust that moves... thanks for that info... I thought it was the intake... I sold my B1M/C heads so I dont have them anymore to look at I was told By Scott Koffel to be able to reuse the MC rockers with Original heads, the exh rocker needs to be moved .040 towards the intake valve. So I assume the intake is moved away from the intake towards the wall? to allow the larger intake valve? Last edited by Bob_Coomer; 09/23/11 05:26 PM. [color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

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