456M - What valve guides and where to buy them?

SN?

thought the M's were not prone to this so you must have an early build model.

But to answer your question: Yes, after market or the upgreaded OEM guides are needed and obviously NOT the same ones that were part of the original build.

Not only that, but aftermarket are less expensive, by far, and better: even having them custom made would be less expensive and better IMO.

Will wait for Taz to give the specs.

r

 

Hello i m a south french owner since 3 years of a 456 M .
I bought it at 50 mkm ,after 3000 km i had to change all the valve guides with the new factory one .48 sintered steel factory guides :1720 euros july 2011 Ferrari Gauduel plus hoses gaskets aso about 11000euros for a perfect work with machining the two heads.
Ferrari Pozzi told me that it was frequent even with the 456 M but they are numberless producted.He recomanded the new valve seals and to do the first 1500 km slowly to let oil do the work.
Now i have done 67mkm sometimes very fast (in germany!) and i did the two gas 'bombs'from Oscaro ( BMW parts) and ...flatbed because bad alternator at 65mkm Change it before ...My advice!
Thats said it s a very fast highway car with good sound (Novalary muflers) and beautiful shape...but you have to look after everything (next new motor mounts and change your fuel filters to check rubber disolving case ( use 98 octane only without ethanol )They are ok from now.
Enjoy and if you want to contact PM me i ll be happy to speak french better than my poor english!...

 

There's a very similar thread a few weeks ago from a UK owner which will give some ideas maybe - scroll down & it should appear

 

Henri- Like Phil said and was mentioned elsewhere, the replacement 456M valve guides are sintered steel like those fitted to the 575M. As a matter of fact, they are the same exact guides used in the 575M and the 612.

Here is Ferrari's bulletin on replacing the bronze guides with the sintered steel guides in 456Ms and 550s.
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Sorry - yes - my mistake

 

I am looking at a 456M to purchase that needs to have the valve guides done. According to the indepdent Ferrari mechanic I consulted with, there are no aftermarket sintered steel valve guides for the 456 (unlike several aftermarket options on the 355). So, OEM sintered steel guides are the only option.

If anyone knows of an aftermarket supplier, I would like the contact info.

 

Aftermarket bronze guides will work fine and last a long, long time. The ones used in late model Ferraris like the F355, 456, 456M, and 550 had a very high copper content in some batches, so wore quickly. CHE Precision is the only aftermarket maker I have on my list, but there must be others out there.

The recommended sintered steel replacement guides from Ferrari are the same as the 575M and 612 guides, and I do not know any manufacturer of SS guides.

You guys need to ask a pro or a machine shop who they recommend, and there are not that many here.

Try these guys and see what they recommend. The bottom one is an FChatter and the top one is the machine shop Brian Crall uses.

Lesco Automotive Machine
3000 McMillan Ave.
San Luis Obispo, CA 93401
(805) 596-0400
Fax (805) 596-0205
Lesco Custom Performance & Race Engines
E-Mail: [email protected]
Machine Shop, Race Engines

S&R Exotic Motorworks
853 State Road 101 South
Liberty, Indiana 47353
765.458.5900
765.277.2848 cell
http://www.srexotics.com/
[email protected]
Engine Rebuilding, Machine Shop

 

Here's a page from Superformance UK's website, but suggest you check & double check with them that they'll fit the 456, and get some return assurance in case they don't:
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When my engine was done, I had the aftermarket bronze guides. They were the way to go along with the 48 custom ground and fitted Manley valves. You can get details from Craig Nelson (his F-chat handle is Monza 456, even though he now has a 430 Scuderia Spyder), owner of The Jag Shop in Portland.

 

John- Those are the OEM Ferrari sintered steel guides and will fit everything from the 456 through the 612. Still way more expensive than good bronze valve guides.

 

Taz, yes they appear to be the new style OEM guides. I say appear only because one of Superformance's strengths is offering reverse engineered parts.

Hence these guides would need to be checked & double checked against the worn guides when they're removed.

 

En peu de temps si tu veux je te tel et te done une mine de renseignements numeros de pieces double d une facture Pozzi avec toutes les ref plus trois ans de compilations sur Fchat ....et surtout mes avatars
Je suis dispo a l heure qui t arrange pour te dire tout cela
A bientot
Philippe

 

Bonjour Philippe , curieux également de connaitre tous les éléments de cette opération !

 

Does driving with worn valve guides create any major damage to the engine? I am looking at a 456M with good compression on 11 of 12 cylinders (218 to 238), but one cylinder is low (about 185). Exhaust valve leakage on the low cylinder is about 44%. The well-respected mechanic who did the PPI said the car can be driven several thousand miles without much issue other than probably some increasing smoke.

The offer price on the car is reasonable and I would have money left over to do a valve job within the next 6 months or so.

I could have the work done over the winter, but would like to enjoy the car until winter comes.

Thanks for any advice/guidance.

 

I'll let the expert wrenches give specifics, but when the valves and/or guides go bad, the car will start throwing codes and telling you to stop immediately and not drive further. I'm pretty sure there will be consequences.

 

I think that exessive burnt oil in the catalysor make abnormal wear at last.
In fact the bad guidance of worn valve guide create a little wearing of the valve seats :excessive play of the valve guide create vibrations at high rev.
At last it makes valve seals pop up .....and smoke like a steam train. ....
My experience..
Regards Phil