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Engine basics => Engine set up tips => Topic started by: Bootlegger on January 27, 2021, 10:34:04 AM

Title: Fox 19
Post by: Bootlegger on January 27, 2021, 10:34:04 AM

 What size bolts are used in a Fox 19 in the head and back plate?   Obliged    H^^   D>K

Title: Re: Fox 19
Post by: john e. holliday on January 27, 2021, 11:36:25 AM

The one I have uses 4-40 bolts. D>K

Title: Re: Fox 19
Post by: Bootlegger on January 27, 2021, 04:08:39 PM

  I am obliged DOC thanks also   H^^ H^^ H^^

Title: Re: Fox 19
Post by: Dennis Toth on January 27, 2021, 06:38:55 PM

BT,
If you are going to switch to socket head bolts you should file down the the head diameter to 0.167" to match the original Fox bolts (I have used a drill press or even a power drill to hold the bolt and hand file). If you don't, the heads will bind against the head bolt sockets and can distort the case and cause the piston to bind which gives erratic runs.

Best,    DennisT   

Title: Re: Fox 19
Post by: Bootlegger on January 28, 2021, 06:22:30 AM

 First thanks for the advice, I forgot to say the engine has a 4 bolt back plate so it is earlier than I thought, I am gonna look for a gasket set also, again thanks... #^ #^

Title: Re: Fox 19
Post by: Dan Bregar on January 28, 2021, 02:57:55 PM

I just looked at my Fox 19's & 25's even have a 201 and they all have 4-40 socket head replacements. Doing that used to be SOP back in the day. Anyone interested in these ?Also have a NIB 25 (the new style circa 1973).

Dan