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Are the heads on the 525 HP (376 c.i.) dogmeat?

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Old 06-28-2024, 09:49 AM
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lep
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Default Are the heads on the 525 HP (376 c.i.) dogmeat?

I'm in the market for a 430 HP (376 c.i.) LS3 long block, since for my application I have to use an electric water pump and am using headers - so I don't need the mechanical water pump and exhaust manifolds.

Rather than purchase the 525 HP, I am planning on pulling the heads from the 430 HP block and driving them to TSP (2-hour drive to Austin) for CNC, double springs, retainers, and trunion upgrade. I'm also planning on dropping a stage 2 cam (TSP) in it. When done, I know the 430 HP will be more than 500 HP, and probably 510-525.

Several questions:

1. Do you think I should just buy the 525 HP and use that? Someone told me that the heads on the 525 HP LS3 still have casting flash and are not CNC'd so they are still dogmeat, but their valve springs, trunions, and cam have been upgraded.

2. Would I run into tuning challenges for what I am doing, vs just buying the 525 HP?

3. I think the TSP stage 2 cam has more lift/duration than the cam used in the 525 HP - so it's chop at idle will sound better?
Old 06-28-2024, 11:07 AM
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is dog meat good or bad?
and how good or bad would that be? does it depend on the breed?

the heads are the same:
https://www.gmperformancemotor.com/parts/19435104.html
https://www.gmperformancemotor.com/parts/19435106.html

the part number they call out is an assembled head: https://www.summitracing.com/parts/nal-12629063

id bet those motors are the same parts except camshaft and whatever extra pieces one has over the other, being complete vs long block
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Old 06-28-2024, 11:36 AM
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I think that going to TSP and doing what you mentioned would be far better than just buying an engine with essentially the same cylinder heads and rocker arms. If they're the LS3 or 821's they will come with the hollow stem intake valves and your plans are to replace the cam regardless.
Old 06-28-2024, 12:56 PM
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"so it's chop at idle will sound better?"
Depends on the dog meat processor... Chopped or ground.
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Old 06-28-2024, 02:33 PM
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Its amazing to older guys like me how far heads have come. To think that stock LS3 heads that probably flow 320+cfm out of the box are considered "dog meat!" Man, Grumpy Jenkins must be LHFAO!!!!!!
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Old 06-28-2024, 05:32 PM
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Great comments. Gandrud tech support replied and said only the cam is different. I'll stick to the plan and have TSP do the heads, and I'll do the cam.

I remember my cousin telling me in the 70s at the Detroit drag strip that Grumpy Jenkins was drilling holes in the top of pistons to get compression down behind the rings! Obviously, one of the early tricks they were doing.

Also learned from the responses there are different types of "dogmeat."

Last edited by lep; 06-29-2024 at 01:13 AM.



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