I've been doing a little reading lately on the different hp ratings with all the different GM and aftermarket blocks. GM performance pretty decent in comparison to std. Seems like new std GM block rated for 800 hp max. Just never know. Some get lucky and some pay the ultimate sacrifice and price.

for what your doing now I'd say you'd be fine although ARP's are like 85.00. As another mentioned If you go after that 800-900+ hp down the road you'll be starting from close to scratch and can replace then also. I've pushed engines to the extreme however with sense for the most part. Engines with over 800/900 hours and rebuilds in btwn and yet to brake a GM main bolt. Hope that helps.

Those are kinda neat to watch most definately can appreciate a well planned out valvetrain. Often over looked. My head guy watched one on the dyno through one of those valve covers with a less expensive version of shaft rockers and literally saw them starting to dismantle. Luckily he got to the dyno operator to shut it down before any damage. Just another example of buying good brand name quality parts weather it be shaft mount or stud mount rockers/girdles. List goes on with pushrods, lifters etc. Very difficult to cut corners. Marine engines especially.