DeTomaso Mailing List: August 2000, Message #141

Me - 3800 RPM    0.550" lift cam  single springs   head popped off stem
Also a friend wasted two 351C's with a 0.560" lift cam.  Both times, the 
new OEM Ford valves slipped out of the keepers.  Don't remember any 
of the other details.   Have talked with lots of others who've experienced 
similar fates. 

Personally, I would never use stock valves in a Cleveland rebuild of any
sort.
If I had a Cleveland with stock valves already together, I'd be looking for
any 
excuse to pull the heads.

Dan Jones 



> ----------
> From: 	KenInSoCal@aol.com[SMTP:KenInSoCal@aol.com]
> Reply To: 	KenInSoCal@aol.com
> Sent: 	Friday, August 04, 2000 11:34 AM
> To: 	Multiple recipients of list
> Subject: 	Use of stock valve etc.
> 
> I've talked to a number of people who have run the stock, two piece, multi
> 
> groove valves with no problem. Others have had severe problems. So either
> the 
> quality varies and some break while others don't, or we are missing
> something.
> 
> Could those who have run these valves successfully or unsuccessfully
> provide 
> me with the following:
> 
>     Max RPM         Cam         Valve Springs           valves
> broke/worked
>                     (lift)          (double or single,        (head broke
> or
>                                 weight if you have it)         retainer
> broke)
> 
> When I get a statistically meaningful response, I'll put it into table and
> 
> share it. Has anyone had a problem with valves breaking in a stock engine?
> 
> Ken 
>