Rod Posted November 22, 2019 Share Posted November 22, 2019 Fuck me right Quote Link to comment Share on other sites More sharing options...
Pete Posted November 22, 2019 Share Posted November 22, 2019 Probably got a 1/2” stroke Quote Link to comment Share on other sites More sharing options...
Anler Posted November 22, 2019 Share Posted November 22, 2019 Will get smoked by a tesla with zero cylinders... 1 Quote Link to comment Share on other sites More sharing options...
Tomas. Posted November 22, 2019 Share Posted November 22, 2019 The ls7 is a 7.0l 427ci. He said that was a 358 ci? Quote Link to comment Share on other sites More sharing options...
bussman Posted November 22, 2019 Share Posted November 22, 2019 6 minutes ago, Tomas. said: The ls7 is a 7.0l 427ci. He said that was a 358 ci? To get that kind of RPM in that application you need to shorten the stroke and get as long a connecting rod in there to slow piston speed down as much as possible. So it’s de-stroked. I’m guessing the bore is as big as possible too to get as large a valve in it. 2 Quote Link to comment Share on other sites More sharing options...
Tomas. Posted November 22, 2019 Share Posted November 22, 2019 Ahhh thanks! Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted November 22, 2019 Share Posted November 22, 2019 1 hour ago, Tomas. said: The ls7 is a 7.0l 427ci. He said that was a 358 ci? My boat engine is an LS7, it's a 454. Quote Link to comment Share on other sites More sharing options...
SVT MXZ XRS Posted November 22, 2019 Share Posted November 22, 2019 Don't really see the point of doing that cause you're way past peak power. With the right combo of bore and stroke, and keeping the valves from floating, you could do that with a small block Ford or Mopar too. Quote Link to comment Share on other sites More sharing options...
Matt Posted November 22, 2019 Share Posted November 22, 2019 Seems like a very fun, very pointless project. Sounds good as hell though! Quote Link to comment Share on other sites More sharing options...
Rod Posted November 23, 2019 Author Share Posted November 23, 2019 1 hour ago, SVT MXZ XRS said: Don't really see the point of doing that cause you're way past peak power. With the right combo of bore and stroke, and keeping the valves from floating, you could do that with a small block Ford or Mopar too. No... you can get them to peak at 11,000 if you want to Quote Link to comment Share on other sites More sharing options...
Rod Posted November 23, 2019 Author Share Posted November 23, 2019 3 hours ago, bussman said: To get that kind of RPM in that application you need to shorten the stroke and get as long a connecting rod in there to slow piston speed down as much as possible. So it’s de-stroked. I’m guessing the bore is as big as possible too to get as large a valve in it. You can do it with 440”, you just need larger volume heads and really pay attention to valvetrain harmonics Quote Link to comment Share on other sites More sharing options...
Rod Posted November 23, 2019 Author Share Posted November 23, 2019 3 hours ago, Tomas. said: The ls7 is a 7.0l 427ci. He said that was a 358 ci? Is LS land people often use the designation by the type of head flange on it Quote Link to comment Share on other sites More sharing options...
SVT MXZ XRS Posted November 23, 2019 Share Posted November 23, 2019 42 minutes ago, 168hp CAT 800 said: No... you can get them to peak at 11,000 if you want to Life expectancy at that RPM is VERY SHORT Quote Link to comment Share on other sites More sharing options...
irv Posted November 23, 2019 Share Posted November 23, 2019 54 minutes ago, 168hp CAT 800 said: You can do it with 440”, you just need larger volume heads and really pay attention to valvetrain harmonics Looks like Hemi heads on that with the plugs on top? Quote Link to comment Share on other sites More sharing options...
Rod Posted November 23, 2019 Author Share Posted November 23, 2019 14 minutes ago, SVT MXZ XRS said: Life expectancy at that RPM is VERY SHORT I been a few years at 8000-8200 on my 388 Quote Link to comment Share on other sites More sharing options...
Rod Posted November 23, 2019 Author Share Posted November 23, 2019 2 minutes ago, irv said: Looks like Hemi heads on that with the plugs on top? That’s just the coil packs 1 Quote Link to comment Share on other sites More sharing options...
Carlos Danger Posted November 23, 2019 Share Posted November 23, 2019 (edited) Nelson Racing Engines made this little gem a while back. What stands out of course is that it is not just a 10 second dyno pull but a purpose built endurance racing engine. Edited November 23, 2019 by Carlos Danger Quote Link to comment Share on other sites More sharing options...
SVT MXZ XRS Posted November 23, 2019 Share Posted November 23, 2019 1 hour ago, 168hp CAT 800 said: I been a few years at 8000-8200 on my 388 8-8,200 is a hell of a lot different than 11,200 Quote Link to comment Share on other sites More sharing options...
Rod Posted November 23, 2019 Author Share Posted November 23, 2019 3 minutes ago, SVT MXZ XRS said: 8-8,200 is a hell of a lot different than 11,200 It’s simple math Quote Link to comment Share on other sites More sharing options...
SVT MXZ XRS Posted November 23, 2019 Share Posted November 23, 2019 27 minutes ago, 168hp CAT 800 said: It’s simple math Lol Yea, but when you get higher than about 7K you better have a good build (even lower on older engines and big blocks) The higher up you go in the RPMs , you need to know what you're doing building an engine. Or it's gonna.cost you a lot of money in repairs and replacement parts. Quote Link to comment Share on other sites More sharing options...
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