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Old 01-08-2003, 09:11 PM   #1 (permalink)
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Forged pistons

I am having a 345 long block built for me by my buddies shop. I have two routes I can go, a standard bore using lightened and polished rods and some type of Venolia pistons, or a .040 overbore using hypereutectic pistons and unmodified rods. I'm going with the Venolia pistons and lightened rods, but was curious about these pistons. The bore fits a 345 and the piston pin to deck distance is the same as a 345 piston but it has a completely flat top. It also uses different rings in different locations than the other 345 pistons. I looked on the underside and saw the number 400 on them. I was wondering if this is simply a custom set of pistons or made for a different motor.
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Old 01-08-2003, 10:03 PM   #2 (permalink)
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When you say lightened rods, how much are you taking off?

Will the block take a "no" bore oversize? It's kind of rare not to need at least 8-10 thou in a 25+ year old motor.
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Old 01-09-2003, 04:29 AM   #3 (permalink)
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Well I can't really say much about your specific pistons. I have a set of custom Venolia pistons in a 380 which resides in my '55 Poncho. They are stock Pontiac 400 bore, but for use with a shorter stroke crank and they are domed top(really high comp, premium doesn't cut it). I am happy with them, as I have pushed this engine hard, on/over the edge of detonation, for years now.

I agree with OS, if you are doing a performance build it's likely some cleanup of the bores would be beneficial. I have had good results with re-ringing when 'rebuilding' to stock specs, but if I'm spending $ on lightened rods and such, the block is getting new new holes, sleeves if necessary($$$).

If the pistons fit stock bore, pin location, and pin diameter, then they likely were made for it. Venolia might know...

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Old 01-09-2003, 06:38 PM   #4 (permalink)
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Not much material has been taken off the rods, just the small ridges on the sides and some off of the flat area on the bottom. I have been told the block will take a standard bore piston, although I did not see him measure it out. The block is in the machine shop getting new cam bearings and the cylinders honed right now. I will see what Venolia has to say about these pistons.
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Old 01-10-2003, 12:10 PM   #5 (permalink)
nice roach.
 
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Hey mark which truck are ya building the engine for? Have you gotten any pics of the latest mods to the traveler? Take it easy man.

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Old 01-10-2003, 06:26 PM   #6 (permalink)
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J-rod, This motor is going in the SSII. That 345 in the Traveler runs well enough for now. At least until I can throw down on a Caddy 500 I picked up a 4.57 geared Eaton rear for it and need to locate a matching front.
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