2 things. 1 is weight a big issue, 2 replaceable sprockets

[jr dragster T]

Block's CAN flex a bit at 6000 RPM plus. Oscar is 100% correct. But the engine would have to be mod'd VERY VERY heavily to get block flex out of it. As long as your not going wide open no gov for like 10 minutes then you should be ok. crank shafts on the other hand DO flex quite a bit at high rpm and at high torque loads, On my junior dragster you will see a dual crank shaft support meaning it supports both flywheel and clutch.

 

[Russ2251]

But the engine would have to be mod'd VERY VERY heavily to get block flex out of it.

This is key. Who does this? Very few. Mr. Jones is safe. Mr. Tyler actually backed me up.

 

[ed1380]

what about me? i backed you up

jk jk

 

[oscaryu1]

This is key. Who does this? Very few. Mr. Jones is safe. Mr. Tyler actually backed me up.

I'm basing this offa the Clones (very prone to block flexing)

Clone's were not built to withstand 8000RPM and 20HP+. When I think Clone, I think a modified one. And that's where we differ.

 

[oscaryu1]

Block's CAN flex a bit at 6000 RPM plus. Oscar is 100% correct. But the engine would have to be mod'd VERY VERY heavily to get block flex out of it. As long as your not going wide open no gov for like 10 minutes then you should be ok. crank shafts on the other hand DO flex quite a bit at high rpm and at high torque loads, On my junior dragster you will see a dual crank shaft support meaning it supports both flywheel and clutch.

Clones have hardened crankshaft pins, so I'm not THAT worried. A new crank's only like $20

 

[Kenny_McCormic]

You can cut the bumpers around the wheels ,but dont cu the section of bumper holding the fame together.