Author Topic: Alloy Head reco  (Read 2338 times)

Offline mark

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Alloy Head reco
« on: 30.09. 2010 11:45 »
I'm ready to order new valves, springs and guides for my 55 road rocket. I'd like to make sure that I get quality items. Any advise as to who can supply, or who NOT to use. Or any other things to be aware of. I'm keeping the inlets original size so they are the smaller ones 67 0968 and not everyone seems to have them. I couldn't find them on SRM's site for example and my local supplier here in Melbourne also doesn't stock them and his prices for the other bits are about double the UK prices.
Regards
Mark
55 road rocket




71 Norton Commando Roadster 750


Australia

Online muskrat

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Re: Alloy Head reco
« Reply #1 on: 30.09. 2010 11:55 »
G'day Mark,
                     "his prices for the other bits are about double the UK prices." Your not talking of a place that starts with M are you  *whistle*
Get used to it down here. I only buy local if needed in a hurry. Seems they all want to be millionairs.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
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Offline a101960

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Re: Alloy Head reco
« Reply #2 on: 30.09. 2010 14:07 »
Mark,

Lyford Classic Services have 67-0968 valves @ £16.04 + postage. Lyford catalogue part number LCS 1006A

Email lcsbsa2003@btinternet.com

website www.lyford-bsa.co.uk

John

Offline mark

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Re: Alloy Head reco
« Reply #3 on: 01.10. 2010 04:20 »
Muskrat you picked them. They do serve a purpose but you pay for it. Thanks John, I see that Draganfly and Supreme also seem to have what I want. I guess what I was trying to establish is whether or not there are dodgy valves and springs out there like some of the other junk around. It is not the sort of thing you want to break on you.
Mark
55 road rocket




71 Norton Commando Roadster 750


Australia

Offline bonny

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Re: Alloy Head reco
« Reply #4 on: 01.10. 2010 21:16 »
is your alloy head cracked about the rockerbox bolt holes ? mine is  *sad2*

Offline mark

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Re: Alloy Head reco
« Reply #5 on: 01.10. 2010 23:10 »
Bonny, I have 3 Alloy heads at present ,a 54/55 with seperate manifold, a 57 and a super rocket and all have good threads and no cracks.
Mark
55 road rocket




71 Norton Commando Roadster 750


Australia

Offline Rocket Racer

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Re: Alloy Head reco
« Reply #6 on: 05.10. 2010 05:38 »
I got my valves and springs for my '55 twin port head from draganfly and had the guides and work done locally.
Although my head looked fine, it turned out the guides had been put in badly damaging the guide holes and I ended up needing two new valve seats. Cost me a small fortune  *doh* but at least its now all done now.

British Spares in Wellington (NZ) are another crowd that have a good on line presence and you can search for stock if you know the part numbers. I get some parts from them depending on availability.
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
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Offline mark

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Re: Alloy Head reco
« Reply #7 on: 05.10. 2010 10:42 »
Thanks Tim I think that I will go with draganfly, the last few times I have used British Spares they haven't been able to supply everything that I was after. What springs did you get? I'm assuming that the 55 uses the same as the later rockets but its hard to find any info. The valves are definitely the same.
Mark
55 road rocket




71 Norton Commando Roadster 750


Australia

Offline Goldy

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Re: Alloy Head reco
« Reply #8 on: 05.10. 2010 12:37 »
Mark. You are quite right to question the quality of these parts and as has been stated in other sections of this form poor quality is becoming a real problem. Draganfly are a reputable Company, but they only buy them from someone else. It would be good if some of these suppliers started to give a guarentee with thier products. I have began to trust SRM with machined parts, but no so sure about any of the others.
56 A10 Golden Flash - Restore, ride, relive.                                          
56 C12 BSA project ongoing

Offline Rocket Racer

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Re: Alloy Head reco
« Reply #9 on: 05.10. 2010 21:14 »
Thanks Tim I think that I will go with draganfly, the last few times I have used British Spares they haven't been able to supply everything that I was after. What springs did you get? I'm assuming that the 55 uses the same as the later rockets but its hard to find any info. The valves are definitely the same.
Mark

Mark,
I actually ordered the later super rocket big valves and springs (not the super fancy expensive ones). My head (I believe) was a converted shooting star one. It had been re radius'ed and ported by a PO but was still running small A7 valves. (it doesnt have the A10 overstamping)
I also had the porting revised. My inlet ports are also way off centre from the manifold studs, so we machined our own manifolds as nothing stock was likely to fit.
A '55 RR should have a 356 cam, so coil bind shouldnt be an issue. I've fitted a 357 and I actually had to get the cam tunnel milled out as it wouldnt fit! *whistle*
Even with the twin TT9's we had it idling quite nicely, but getting it to start before we started fiddling with them was an absolute B@#$@#$t. we towed the bike quite a distance, but admittedly werent helped by clutch slip.
Look forward to seeing a pic of the mighty RR finished!
Tim
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
New Zealand

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Re: Alloy Head reco
« Reply #10 on: 06.10. 2010 09:56 »
G'day RR,
                 funny about the cam trough, I have fitted a 357 to both the '51 A7 and the '57 SS now with A10 cases with room to spare.
The inlet tracts are supposed to be off center to the studs. 1.41" in and 1.38" ex valves fit no worries, the later big valves take a little work.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline magicflem

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Re: Alloy Head reco
« Reply #11 on: 06.10. 2010 11:30 »
I have an alloy head number 67-1549. Can anybody tell me what model it is off?
1930 BSA B30-3 Side Valve Girder (being restored)
1955 BSA A10 Road Rocket
1955 BSA A10 Golden Flash
1956 BSA A10 Road Rocket
1951 BSA A10 Golden Flash
1956 BSA DB32 Gold Star Clubman
1958 BSA A10 Super Rocket
1961 BSA C15 (being restored)
1961 BSA C15 Star "America" (being restored)
1961 BSA A10 "Big Valve" Super Rocket (being restored)
1963 BSA A10 Rocket Gold Star

Online Brian

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Re: Alloy Head reco
« Reply #12 on: 06.10. 2010 11:51 »
This should answer your question.

http://atlanticgreen.com/a10alloyhead.htm

Online trevinoz

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Re: Alloy Head reco
« Reply #13 on: 07.10. 2010 00:30 »
If that doesn't, it is a Big Valve head from 1960 on.
Trev.

Offline magicflem

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Re: Alloy Head reco
« Reply #14 on: 07.10. 2010 05:31 »
thanks Brian and Trev..
1930 BSA B30-3 Side Valve Girder (being restored)
1955 BSA A10 Road Rocket
1955 BSA A10 Golden Flash
1956 BSA A10 Road Rocket
1951 BSA A10 Golden Flash
1956 BSA DB32 Gold Star Clubman
1958 BSA A10 Super Rocket
1961 BSA C15 (being restored)
1961 BSA C15 Star "America" (being restored)
1961 BSA A10 "Big Valve" Super Rocket (being restored)
1963 BSA A10 Rocket Gold Star