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Old 05-11-2020, 07:14 AM
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Default LB7 Pushrods

Well rod broke and building another block and bent a few push rods. What are best push rods to buy. Motor pushing 800hp.
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Old 05-11-2020, 07:17 AM
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more a matter of what valve springs you are running and rpm.
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Old 05-11-2020, 07:21 AM
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Has stock springs and running 3300 rpm, but may turn that up. Replacing pistons with 0.020 over diamond cast pistons with valve reliefs. May need to change springs also?
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Old 05-11-2020, 07:38 AM
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My merchant's are holding up in my stock engine. Probably not the info you're looking for but that's all I have on pushrods haha.

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Old 05-11-2020, 08:05 AM
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I'm running SoCal without issues and my daily driver will be getting them as well.
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Old 05-11-2020, 08:53 AM
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Quote:
Originally Posted by DuramxMan View Post
Has stock springs and running 3300 rpm, but may turn that up. Replacing pistons with 0.020 over diamond cast pistons with valve reliefs. May need to change springs also?
again, depends on what RPM you want to turn, where you want the power band with turbo/s, what kind of head and cam setup and converter you want to match with.

if you are going base with stock springs or say, the light hamilton springs, the hamilton pushrods (thinnest ones) will be plenty.

Personally, i wouldnt just add the thickest pushrods and call it good. Thats more weight on the valve train thats not needed and wont help you in high rpm.
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Old 05-11-2020, 10:47 AM
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For what it's worth, I'm running SoCal beehive valve springs, shift at 3600 RPM (with occasional blitzes to 4800+ RPM during burnouts), and I'm on stock LB7 pushrods.

The stock pushrods are designed to run the stock valves at ~4800 RPM during engine braking, and are actually pretty strong. I'd imagine you only bent yours during the engine failure.
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Old 05-11-2020, 12:17 PM
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Merchant ones here
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Old 05-11-2020, 01:01 PM
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I would be upgrading valve springs before I worried about push rods.
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Old 05-12-2020, 06:14 AM
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What’s the weight difference between the aftermarket and stock pushrods ? Curious
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Old 05-12-2020, 08:52 AM
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Quote:
Originally Posted by JoshH View Post
I would be upgrading valve springs before I worried about push rods.
This^.

If you have to, merchant's are the best bang for your buck without getting heavier than needed. We used them at 16xxhp and ran down the track 5500 rpm. Big engine builders will recommend .145 wall pushrods for extreme app's but .083 served us well time after time.
Years ago, we had trouble with Hamilton's push rods. Bought his springs and pushrods, springs did well for us, still in an engine. But the pushrods were too short, to the point that the adjusters had to be wound way out to account for it. I didn't like the angle it produced, so we shelved them.

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