quote:Originally posted by PanteraDoug:
That is the Crane rocker arm stud kit.
http://www.summitracing.com/pa...Sg6n9EFdoRoCO0Hw_wcB
They show 7/16" on the outside but are 5/16" mounted to the head where the bolt on rocker arm normally goes to.
This saves you from the effort and cost of machining the pedestals to the Boss302/351 style.
Personally I would not trust that size bolt, i.e., 5/16", on a high performance application. They will snap pretty easily if you raise the spring pressure to 350 to 380 which is what you normally would use with a high performance, non-stock camshaft and valve train.
Don't pay extra for that conversion that is shown. They are not reliable.
...Ageed! Doug is Absolutely Right! Those things shouldn't even be on the Market, Period! Summit has opened themselves up to a great liability. In My Opinion, they are a Cheap Short-Cut to milling/drilling/tapping the Stud Bosses, That WILL FAIL the very first Day!!
Get rid of them! Or Sooner than Later...'It' will be Much More Expensive than doing the Machining, In The First Place! That Any Shop will do for $200.00....7/16" ARP Studs, less than $100.00