Lt4 hot cam

Rusty Nail said:

I was recently turned onto the idea of an LS1 cam.

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Rusty Nail said:

Good read:

http://www.hotrod.com/how-to/engine/1307-ls-cam-test-comparison/

Ahh!
SPECIFICALLY a 2000 model LS1 cam?

http://ls1tech.com/forums/generation-iii-internal-engine/1438507-ls1-cam-5-3l-lm7.html

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Rusty Nail said:

Good read:

http://www.hotrod.com/how-to/engine/1307-ls-cam-test-comparison/

Ahh!
SPECIFICALLY a 2000 model LS1 cam?

http://ls1tech.com/forums/generation-iii-internal-engine/1438507-ls1-cam-5-3l-lm7.html

Click to expand...

slowburb said:

Correct for the most part. Why would anyone need 1.6:1 rocker arms to run this cam? Are 1.5:1 ratio rockers incompatible?

No, 1.5:1 rockers are not incompatible. They bolt on and work the valves down and up just like 1.6:1 rockers do, just with about 0.030" less travel.

I completely disagree with this statement. This cam is designed for a light vehicle ideally equipped with a manual transmission. I don't claim smarter than GM engineering, but I wouldn't run that cam in anything...much less a Corvette.



Like any "bigger" camshaft, lower rpm torque is compromised for mid to upper rpm torque when valve duration is increased. This doesn't lend itself well to typical street operating rpm, as it shortens the rpm range where the engine is being efficient. In other words, if typical operating range is from off-idle to 4500 rpm, when duration is increased, you should expect for the engine to start making respectable power at a higher rpm, in a direct relationship, where as the duration increases, so does the lower end of the operating range. With less power available at or near idle rpm due to increased valve duration, it is more difficult for the engine to start moving the vehicle, or keep the vehicle moving. In a vehicle with an automatic transmission, a "looser" torque converter is used to allow the engine to rev up closer or into the engine's actual operating range so that it can adequately propel the vehicle into motion from a stop. The LT4 hot cam is in thousands of old school SBC's; both poorly matched and well matched to the rest of the combination. A well thought out combination of parts is what makes a vehicle perform better than in stock configuration.


K.I.S.S. answer: An LT4 hot cam will not work in an otherwise stock pickup truck.

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DickC said:

Any suggestions on a brand of rockers or which ones to avoid. building a dd. very little off road use. 4x4. real just something to romp through traffic

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slowburb said:

Sure. I'm running Scorpion brand aluminum full roller rockers. I bought these because ar the time i put the engine together, I was unable to find a set of crane brand gold series roller rockers. Those are the rockers GM put into production engines. Engines they'd have to warranty. Anyways I'd stay away from proform and pro comp, both known to be cheap Chinese junk. If you're trying to fit them under stock vortec valve covers there are only a few that will work. It will be listed in the notes of the rockers on say summit's website. They must be self aligning unless your heads are modified with guide plates. My scorpions are nice. I'm sure comp makes some, I'm just not a comp fan personally.

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DickC said:

I heard that. yea truck is bone stock l31 4l60e at the moment. trans went out last week so I'm about to order a 4l60e monster trans. was debating if I should go ahead and get the stall converter and plan for the cam and 411 swap and tune shortly after. but as far as I can tell with the 395 I wont need the stall. So I'm just doing some research on hopefully planning for the near future. the 411 swap is gonna be first after the trans then cam and tune. Should I do push rods or anything like that while I got it stripped down.

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