It just won,t rpm

[Grumpy]

The 454 in my truck is more or less kind of unfamiliar territory. It's the only motor I have had in toy that was put there by a previous that I haven't done much to but drive. I usually know what I have inside and out because I do the assembly myself and know what is in it. This is also my first big block.

What I have is basically a 454 with what most people would refer to as an RV cam,781 oval port heads and I added the small weiand 177 supercharger other than that I really don't know what is in it. It runs good but I'm a little Leary of spinning it over 5000 rpm.

I've made some wiring changes and some carb changes because before it would get to about the 5000 RPM mark and wouldn't rev any higher. Now it revs to 5000rpm and wants to keep climbing at a fast rate. I drove it today and had to use my throttle control as rev limiter.

Just curious what a general safe rpm is for a 454 with unknown or stock components would be. I really don't hurt it but I want to drive hard from time to time.

the answer to your question is dependent on the quality and strength of the components used and the care taken to assure correct lubrication, and clearances, but its the valve train and the hydraulic lifters and valve spring load rates, and the intake manifold design, that are the most likely components that will limit your engines rpm potential to under 6000 rpm.
yes the small weiand 177 supercharger might be just running into the upper rpm range where its no longer able to supply the necessary air flow the engine requires , but its more likely to be a combination of factors .
you might also consider the fact that a restrictive exhaust or partly clogged catalytic converters can seriously restrict power in the mid and upper rpm ranges, or that the ignition advance curve needs to be changed.
as always ISOLATE AND TEST!
ID grab a timing light,and check the ignition advance curve,Id verify the valve spring load rates and clearances, and check the valve lift to verify the cam lobes are mot worn,Id use a vacuum/pressure gauge, and check boost in the plenum,and fuel pressure at the carb at peak rpms, with a fuel pressure gauge,and Id do a compression test, Id check the fuel level in the carbs float bowls , Id read the spark plugs and start checking the intake boost pressure,and verify the exhaust back pressure!

http://garage.grumpysperformance.com/index.php?threads/the-trucks-just-not-running-well.13435/

redline

youll generally find that 4000 FPM (FEET PER MINUTE)of piston speed with stock parts or 4500fpm with VERY good quality forged parts is the reasonable limit on the lower end ROTATING ASSEMBLY stress, if you don,t think selecting high quality components and correctly assembling them is...

garage.grumpysperformance.com

http://garage.grumpysperformance.com/index.php?threads/redline.343/#post-419

http://garage.grumpysperformance.com/index.php?threads/types-of-crankshaft-steel.204/

http://garage.grumpysperformance.com/index.php?threads/rod-bolts-rpm-vs-stress.341/

http://garage.grumpysperformance.com/index.php?threads/verifying-your-real-advance-curve.4683/