Author Topic: CB750 F2 cylinder head  (Read 2458 times)

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Online Bill/BentON Racing

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CB750 F2 cylinder head
« on: May 08, 2015, 08:32:42 am »
That's right, a good one still assembled, $225.00 plus shipping, Bill
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Offline dragracer

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Re: CB750 F2 cylinder head
« Reply #1 on: May 08, 2015, 10:22:27 am »
Someone buy this head. Its a good base for a stock valve, 1000cc, 10 second drag motor. Ask me how I know

Offline TurboD

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Re: CB750 F2 cylinder head
« Reply #2 on: May 08, 2015, 01:50:42 pm »
How do you know.... Hehe

Offline dragracer

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Re: CB750 F2 cylinder head
« Reply #3 on: May 08, 2015, 02:02:35 pm »
I've got the time slips to prove those heads will work with the factory valves, good springs,  light port work, a decent size cam and a 72mm bore.

Offline bear

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Re: CB750 F2 cylinder head
« Reply #4 on: May 08, 2015, 02:07:12 pm »
Not one of mine I hope Billy ;)

Cheers,
Brian
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Online Bill/BentON Racing

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Re: CB750 F2 cylinder head
« Reply #5 on: May 08, 2015, 02:53:40 pm »
Haha  of course not. Yours in the box marked Bear's heads! ;D Bill
BentON Racing Website
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Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
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Offline sohc boy

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Re: CB750 F2 cylinder head
« Reply #6 on: May 08, 2015, 02:56:46 pm »
 i too have run 10's with these heads  ported,stock valves an springs ,shimmed up
i live by the voice inside my head

Offline dragracer

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Re: CB750 F2 cylinder head
« Reply #7 on: May 08, 2015, 04:23:42 pm »
i too have run 10's with these heads  ported,stock valves an springs ,shimmed up
And there you have confirmation. I can't speak about the performance of the earlier model heads after port and valve spring work but with the right cam and pistons, they make decent power. And that's my last sales pitch for Bills cylinder head. Lol.

Online Bill/BentON Racing

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Re: CB750 F2 cylinder head
« Reply #8 on: May 13, 2015, 03:53:57 am »
OK, a deal for someone, cylinder head for $225.00 shipped 48 states, best I can do, Bill
BentON Racing Website
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Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
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See our latest build 'Captain Marvel' CLICK HERE

Offline 70CB750

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Re: CB750 F2 cylinder head
« Reply #9 on: May 13, 2015, 04:03:51 am »
Haha  of course not. Yours in the box marked Bear's heads! ;D Bill

Bear's Heads would be great name for beer :)

Offline Retro Rocket

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Re: CB750 F2 cylinder head
« Reply #10 on: May 13, 2015, 07:01:12 pm »
OK, a deal for someone, cylinder head for $225.00 shipped 48 states, best I can do, Bill

What do you do to get the compression sorted with these heads on K engines Bill..?  I may be interested   ;)
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Offline cbr954

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Re: CB750 F2 cylinder head
« Reply #11 on: May 17, 2015, 08:01:48 pm »
I had to mill my F2 head .060" to get the chamber volume the same as earlier K head.  Running 10.5 :1 cycle x 970 K pistons.  You also have to have brass bushings installed in some of the cylinder stud holes in the head so you dont have oil leaks.
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Offline TurboD

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Re: CB750 F2 cylinder head
« Reply #12 on: May 17, 2015, 08:07:54 pm »
Looks nice that should make good power.

Offline HondaMan

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Re: CB750 F2 cylinder head
« Reply #13 on: May 17, 2015, 08:12:37 pm »
I've been using the 750 DOHC pistons with their shoulder turned off 1.5mm, about 1/4" in, with the K7/8 and F2/3 heads. It makes the CR about 9.2:1 on the F, and about 9.5:1 on the K7/8 head. I also mill the heads a bit, about 0.5mm.
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Offline Retro Rocket

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Re: CB750 F2 cylinder head
« Reply #14 on: May 18, 2015, 12:50:40 am »
I had to mill my F2 head .060" to get the chamber volume the same as earlier K head.  Running 10.5 :1 cycle x 970 K pistons.  You also have to have brass bushings installed in some of the cylinder stud holes in the head so you dont have oil leaks.

Thanks 954, If I buy it, it will be off to Mr Rieck's place for a stage 4....
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline Retro Rocket

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Re: CB750 F2 cylinder head
« Reply #15 on: May 18, 2015, 12:55:29 am »
OK, a deal for someone, cylinder head for $225.00 shipped 48 states, best I can do, Bill

PM sent Bill   ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline Old Scrambler

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Re: CB750 F2 cylinder head
« Reply #16 on: May 18, 2015, 06:31:10 pm »
RR..........take a look at the 915 kit from Dynoman for the F2-3 motors. I used CB900C rods with J&E 62mm pistons and installed a squish-band on the perimeter of the head except at the valves where it is not needed. No decking other than a few thou to get level. Note the egg-shape of the chamber perimeter. Compression is 12:1+ when cold.



 
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Offline Retro Rocket

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Re: CB750 F2 cylinder head
« Reply #17 on: May 18, 2015, 07:47:41 pm »
RR..........take a look at the 915 kit from Dynoman for the F2-3 motors. I used CB900C rods with J&E 62mm pistons and installed a squish-band on the perimeter of the head except at the valves where it is not needed. No decking other than a few thou to get level. Note the egg-shape of the chamber perimeter. Compression is 12:1+ when cold.

OS, this would be going on a billet block 1000cc engine, on a K8 bottom end, if it will work, i'm interested in the F2 head because of the bigger inlet spigots, I'm going to run fuel injection and the Throttle Bodies I have are going to be easier to fit using the bigger diameter F2 rubbers and spigots, I considered having F2 spigots machined into a 392 K8 head, but if the F2 {410} head will work I will go with that...
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline bear

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Re: CB750 F2 cylinder head
« Reply #18 on: May 18, 2015, 07:59:00 pm »
My opinion.

The 410 head is the best option for a motor that size Retro.

Cheers,
Brian
 
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Offline Retro Rocket

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Re: CB750 F2 cylinder head
« Reply #19 on: May 18, 2015, 08:17:52 pm »
My opinion.

The 410 head is the best option for a motor that size Retro.

Cheers,
Brian

Thanks Brian... ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline motorclocks

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Re: CB750 1970 cylinder head, cam and holders
« Reply #20 on: December 14, 2018, 11:52:08 am »
not sure if im doing this right, can't figure out how to post question. I have a 1970 cb750 head no cam or towers can i get them from another head same year and have them work.

Online MRieck

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Re: CB750 1970 cylinder head, cam and holders
« Reply #21 on: December 14, 2018, 06:24:54 pm »
not sure if im doing this right, can't figure out how to post question. I have a 1970 cb750 head no cam or towers can i get them from another head same year and have them work.
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Online MRieck

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Re: CB750 F2 cylinder head
« Reply #22 on: December 14, 2018, 06:43:35 pm »
I had to mill my F2 head .060" to get the chamber volume the same as earlier K head.  Running 10.5 :1 cycle x 970 K pistons.  You also have to have brass bushings installed in some of the cylinder stud holes in the head so you dont have oil leaks.
That deck # is correct.....055 to .065. Though those #'s start to miss with the cam chain. Boy...older thread  ;D
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Offline PeWe

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Re: CB750 F2 cylinder head
« Reply #23 on: December 15, 2018, 07:45:36 am »
F2 head (std height) on K1-K6 cylinder with F2 pistons or with K 12.5:1 pistons should work too?
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Offline Cougars750F0

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Re: CB750 F2 cylinder head
« Reply #24 on: December 15, 2018, 12:53:25 pm »
Sold?
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