turbo block...
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Elder User
Joined: Mar 2003
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From: Colorado
turbo block...
So I want to build a "turbo" block. I start with an old block, worn but good (250K & never been bored) ,'tank&'flux and align bore (if needed), true, bore (if needed - minimum/ how much?) ; forged (?) steel crank- turn(minimum) if needed; steel (?) rods, forged aluminum dished pistons - what compression ratio? Stock wrist pins? What bearings? Now I have a starter turbo block... I think, at least.... with all those "?"'s answered, I think I have a start. Did I miss something?
Please let me know...
'member, I'm runnin' at 6K base altitude....
Please let me know...'member, I'm runnin' at 6K base altitude....
Last edited by broncr; Apr 2, 2003 at 11:07 PM.
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Joined: Dec 1999
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From: Copley, OH
turbo block...
How much boost? It makes a difference. For 6 psi or so, stock pistons are OK as are stock conn rods fitted with ARP fasteners and a prepped stock crank. If you're going up to 10 PSI you need to upgrade the pistons and above 14 or so you'll need to be putting in aftermarket rods and a steel crank.
There's some discussion about whether forged or hypereutectic pistons are better for a boosted engine
There's some discussion about whether forged or hypereutectic pistons are better for a boosted engine
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
turbo block...
Stock rods, shot peened with ARP bolts, Forged pistons ceramic coated, stock wrist pins, balanced and stress-relieved stock crank, stress relieve the block, and, if it's available, have the coolant passages garnet blasted. It's kinda like sand blasting, but more efficient and less mess. It's not as expensive as it sounds, and looks to be well worth it. As far as boring, the minimum you can go to clean up the bore and get to a common size is all you want. There is only a negligible gain from extra boring. The one I am building is going to have rods from a 240, along with KB pistons with a very short compression height, and a ceramic coating. You want to keep the compression right around 8:1, and that is good for 8psi of boost on pump gas. Any more on either, and race gas might be necessary. The ceramic coating on the pistons generally runs around $180 for all six, and is more than worth it. The engine will live much longer, and the oil temerature will be greatly reduced.
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Elder User
Joined: Mar 2003
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From: Colorado
turbo block...
'sounds like some very good considerations for a turbo 300 block, be it low, medium or high boost. 'preciate it.
PS... did the HD blocks come in a particular series of trucks/years? How do you distinguish one from a standard block?
PS... did the HD blocks come in a particular series of trucks/years? How do you distinguish one from a standard block?
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From: Conyers
turbo block...
Originally posted by StrangeRanger
All stock 300 rods are forged.
All stock 300 rods are forged.
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