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620 Heads to a M750 ?

Started by Von Eisen, July 22, 2015, 07:21:30 PM

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Von Eisen

July 22, 2015, 07:21:30 PM
G/Day guys, Id like to pick your brains ...

Im building up an old M750 (year 1997) ... I have a new set of 11.1 Ferracci drop ins Im going to fit and have been offered a set of 620 heads. Am I right in thinking 620 heads have larger valves and will fit up to the M750 motor ?

Brgds, Von Eisen   

DarkMonster620

#1
July 22, 2015, 07:38:56 PM
they should and the engine will breath waaaaaay better
Carlos
I said I was smart, never that I had my shit together
Quote from: ducatiz on March 27, 2014, 08:34:34 AMDucati is the pretty girl that can't walk in heels without stumbling. I still love her.
"When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth."

Von Eisen

#2
July 26, 2015, 01:01:22 AM
Thanks DarkMonster620

DarkMonster620

#3
July 26, 2015, 07:11:14 AM
I want to do the opposite . . . put 750 piston in my 620 . . .
Carlos
I said I was smart, never that I had my shit together
Quote from: ducatiz on March 27, 2014, 08:34:34 AMDucati is the pretty girl that can't walk in heels without stumbling. I still love her.
"When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth."

caperix

#4
July 27, 2015, 06:15:50 AM
Quote from: Von Eisen on July 22, 2015, 07:21:30 PM
G/Day guys, Id like to pick your brains ...

Im building up an old M750 (year 1997) ... I have a new set of 11.1 Ferracci drop ins Im going to fit and have been offered a set of 620 heads. Am I right in thinking 620 heads have larger valves and will fit up to the M750 motor ?

Brgds, Von Eisen   

Not 100% but I thought that the 620 & the 750 have the same size valves but the 620 has better cams.  The 695 & 800 do have bigger valves.  I have heard there are some compadability issues with the oil spigot on earlier vs late cylinders, but that may be just the bigger engines.  Brad Blacks website has some good info on this http://bikeboy.org/duccamspec.html

Raux

Re:
#5
July 27, 2015, 07:38:45 AM
696 heads are said to be the best of that size. Largest valves you can put on that bore

Raux

Re:
#6
July 27, 2015, 07:39:15 AM
And with 1100 cams is so fun

Von Eisen

#7
July 30, 2015, 11:34:09 PM
Quote from: caperix on July 27, 2015, 06:15:50 AM
Not 100% but I thought that the 620 & the 750 have the same size valves but the 620 has better cams.  The 695 & 800 do have bigger valves.  I have heard there are some compadability issues with the oil spigot on earlier vs late cylinders, but that may be just the bigger engines.  Brad Blacks website has some good info on this http://bikeboy.org/duccamspec.html

Thanks for that caperix, I was talking to another member and he too expressed the same thoughts as yourself  on the 620 and 750 valves and cams ... I may research the 800 option ...  Great link btw, there is some very interesting info written there  [thumbsup]

Von Eisen

Re:
#8
July 30, 2015, 11:35:43 PM
Quote from: Raux on July 27, 2015, 07:38:45 AM
696 heads are said to be the best of that size. Largest valves you can put on that bore

Thanks Raux, more food for thought  [thumbsup]
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