how many rpm's are stock L92 heads good for?
11-26-2011, 03:23 PM
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What are you asking? They seem to be intake limited with the stock intakes to 6k-6.4k. With after market intakes they are making power too 7k.
Witht the stock valves and springs 5.8-6.2 k is my guess with stock type cam. and lifters.
Witht the stock valves and springs 5.8-6.2 k is my guess with stock type cam. and lifters.
11-26-2011, 06:21 PM
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11-26-2011, 07:08 PM
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To answer your post OP, with the proper cam and a stock bottom end, youll be safe to 7,000
11-26-2011, 08:55 PM
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Thanks for the replies. I understand the springs for the right cam. I noticed the LS3 heads are supposed to be similar except for hollow intake valves. Didn't know if a "lighter" valve train would be better for a high RPM engine.
11-27-2011, 03:57 PM
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11-27-2011, 04:32 PM
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Fully aware I was just using those heads as a random example. The L92 heads will spin to the moon with a ton of work. I believe the title says stock. Heads are the MOST IMPORTANT part of any high RPM racing application making your initial thread irrelevant.
11-27-2011, 05:16 PM
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The OP got the info he needed after some clarification of his original question, and can make an informed decision.
11-28-2011, 10:33 AM
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No dice, i didnt spend extra money on weaker valves. I have solid valves in mine. Also i assumed everybody would realize it, but i will go ahead and say it. ITS JUST MY OPINION. Giving people food for thought. Thanks. Also just for the record, ive seen the the shitty hollow valves distort, bend, and stretch under use with heavy springs etc... Same argument over aluminum and iron block. it is what it is.
11-28-2011, 10:38 AM
#17
No dice, i didnt spend extra money on weaker valves. I have solid valves in mine. Also i assumed everybody would realize it, but i will go ahead and say it. ITS JUST MY OPINION. Giving people food for thought. Thanks. Also just for the record, ive seen the the shitty hollow valves distort, bend, and stretch under use with heavy springs etc... Same argument over aluminum and iron block. it is what it is.
The trend for making power over the broadest rpm range is to have the lightest, stiffest, strongest valvetrain you can. The lightest valves & rockers, the stiffest pushrods, the strongest springs. You need valve control along with fast opening and closing of the valves. Always go for the lightest valves you can afford that will last. Weight is the enemy and trust me, those stock L92 valves are HEAVY.
11-28-2011, 04:19 PM
#18
No dice, i didnt spend extra money on weaker valves. I have solid valves in mine. Also i assumed everybody would realize it, but i will go ahead and say it. ITS JUST MY OPINION. Giving people food for thought. Thanks. Also just for the record, ive seen the the shitty hollow valves distort, bend, and stretch under use with heavy springs etc... Same argument over aluminum and iron block. it is what it is.
Heavy valves cause valve float, that causes parts to seperate and crash back together. The light LS3 valves are better for a street strip car.
