Raptor Spring part numbers ???

#1
The Briggs illustrated parts list for the Raptor 3, (5HP),shows a part number of 555076 for both the Int. and Ex. valves. Yet I have come across a Briggs motorsports valve spring with a part number of 555060 on the box. Was there a part number change from Raptor one to Raptor 3? Should'nt the stock springs be different for the exhaust and intake? I am in the process of refreshing what I believe to be an early raptor 1 for putt-ing around use on a Stellar mini, (Carb rebuild/valve job/94ss/.010 milled head), and would like to toss in some new springs, (cause their readily available, and a cheap peace of mind) while I got it apart? Appreciate any info on the springs, and this cheap refreshing project. Thanks.
(Yes I have Jimmy Glenn's great book, just not building a racer.....:grind:yet).
 
#2
According to my parts lists, the 555060 valve spring was used on the intake valve of the Raptor I and is identical to the 690520 spring which is the factory stock 5hp intake spring. The Raptor I has the 555076 exhaust valve spring.

The Raptor II had the 555076 spring on both intake and exhaust valves identical to the 692180 spring which is the factory stock 5hp exhaust spring.

My parts list for the Raptor III lists 555076 for both valves.
 
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