the cap has much more to do with the rad than the engine, your rad isn't likely to take the pressures a 13# cap would generate with an engine running hot

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics