As has been said,goto local briggs dealer or contact briggs customer tech service.
On the 3200 series eng it gets a little confusing as to correct valve guides depending on material guide made of.
My microfiche cards,partstree & newer briggs L head service manual(pn270962)show guide as an aluminum guide pn 231218,however an old briggs manual I have from mid 70's show guide as being a brass guide pn 230665,without knowing material guide made of & pn it could be either guide.
If you have access to a newer briggs L head service manual check in section 6 pg 11,same shows different pn valve guides,no measurements given in drawings,the aluminum guide appears to be the longer guide.
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