hey guys i am kind of knowledgable about motors. you know the basics. what i was wondering is i am building a new motor and wanted to go with the 447 lunati stroker but also wanted to be able to push the 8500-9000rpm if not 10000. am i going in the right direction with the stroke and just need to go with stage three heads and a custom grind on the cam or what? how would i be able to achieve the highest rpms? different stroke? help me guys i am lost. i want other opinions besides that of sales agents for car parts places that work off commision. thanks guys

 

You can rev a stroker motor pretty high (7000 RPM's) but, a 447ci is way too much stroke to rev 8500+RPM's. If you want more revs, go with a 388 all-bore. Why do you feel you need or want to rev that high?

 

i dont think its possible...its all about the valvetrain and rotating mass as to how far you can spin a motor up safely...unless you dump about $100k into your motor your gonna be limited to about a 7000rpms redline

 

I am building my motor and i just want to build what i want the first time not the second or third time around. i want as much out of it as possible. why not?

 

LS1's are already making SERIOUS power without revving that high. If you want all out power, build a 427 C5R w/ T80+ turbo or huge amounts of spray. An engine that revs that high won't last long at all. Like stated before, your valve train won't like it much. You'd end up changing valve spring at about every oil change. What kind of power are you looking for? Do you want a daily driver, street/strip or all out drag car?

 

First to run 9K to 10K rpms is going to require a lot of premium parts not to mention a expensive solid roller vavletrain. I agree that going with an all bore motor would be a better choice if you wanted to rev high, but not 9K to 10K. Of course there is a lot of other stuff that i have said, and other then that there is no need to rev that high. High rpms are used mostly by different classes that have cube restrictions.

 

I'm no expert, but I would think you could come close. As has been stated a stroker won't like to spin very high, so I'd go along with the all bore suggestion. Where you'll want to spend your money is on the blue printing and balancing of the bottom end and the strengthening of the components. As far as valvetrain, you would need to go solid roller and talk with some vendors about what springs and rockers to go with. I've heard about more than one destroked SBC that could hit 9k and was street driven, so the LS1 should be able to come close.

 

The only thing between possiblity and reality is the thickness of your wallet. . .to make reality easier, thickness needs to be great....

Chris

 

yes..u need very very high end springs/pushrods/balancing to get into the 10,000 rpm range........and I wouldn't go any bigger than 383 bore/stroke cause turning big pistons @ 10,000 rpm's will create a tremendous amount of stress on the rods/crank/wrist pins.

 

I also think you need to understand how much head flow and cam duration it takes to make power at 8000-9000 RPM, C5R heads and a sheetmetal intake would be a good start.

If you want a good street engine, build as big as possible, put the best heads and intake you can buy and have fun with it.