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Old 10-23-2012, 05:15 PM
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454 bored 30 over piston fit ?

ok got my block back from machiene shop they said since i didnt send any pistons with it they bored it straight 30 over and i would have to finish hone when fitting my pistons, will the bore be more i want to use forged pistons.

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Old 10-23-2012, 05:19 PM
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hope they only did 29 over.. so you can finish once you have pistons in hand
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Old 10-23-2012, 05:23 PM
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they said they did it straight 30 is that a problem with forged pistons
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Old 10-23-2012, 06:04 PM
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Every piston manufacturer has its own specs. You should NEVER have a block bored without knowing/having the pistons.
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Old 10-23-2012, 07:16 PM
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well sent it off to see if the block was any good and they said yes but it needed to be bored so i said ok and they bored it will i have to have it rebored or what
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Old 10-23-2012, 07:24 PM
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If you have + .030 pistons, if you bored again you will need new pistons sized to the bore. What you need to do now is have your machine shop check your piston to wall clearances. If they're OK they can hone to the correct clearance. If they're to small you will need to bore it to probably .040, and give them the pistons with the block. Check the piston manufacturer for their recommended clearances.
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Old 10-23-2012, 07:31 PM
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dont yet have the pistons trying to find some forged pistons to give me 10.5.1 compression with 118cc heads. at a decent price
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Old 10-23-2012, 08:05 PM
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then you shouldn't have had it bored..
now you are locked into pistons that will work with that bore, and not be loose, forgings run loose as they explaned more than cast..
as you STILL have to finish hone that take even more material out..
good luck..
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Old 10-23-2012, 09:47 PM
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measure the bore exactly.Find pistons from someone that fits what you have or close to it.Some forged pistons have 7 thou or more clearance.each piston needs to be finish fit to bore as there may be variances in the box of pistons when they come.Making all the clearances the same is part of the blue printing process
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Old 10-24-2012, 01:04 AM
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Here's what I would use, 23cc domes make 9.9:1 @+0.030". That's really all the SCR you need for good BBC performance on pump gas. More SCR means more cam, more converter, more gear.
SRP 212135 Forged Small Dome Profile Pistons 4.280 Bore | CNC Motorsports | Car Parts | Truck Parts | Competition Engines
BOBCRMAN@aol.com builds these "Saturday Night Special" motors all the time. Counsel with him about the right cam to use. He may have a better idea for the pistons also.
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Old 10-24-2012, 05:22 AM
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If it was a reputable shop they probably just sized the bore ready to hone to a +.030 piston. I highly doubt they went the full .030 on the bore and left nothing to hone. If you have a good way of measuring what your bore is now it's probably going to be somewhere around 4.275
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Old 10-24-2012, 12:04 PM
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If engineczar is wrong you need to avoid that shop (the one that bored your block) like the plague, they suck. But before you panic measure the bore and see exactly what you have.
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Old 10-24-2012, 02:00 PM
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Quote:
Originally Posted by hpete View Post
If engineczar is wrong you need to avoid that shop (the one that bored your block) like the plague, they suck. But before you panic measure the bore and see exactly what you have.
x2
and ask them what exactly they mean by full 30 bore..
did they even use torque plates...?
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Old 10-25-2012, 11:32 AM
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Quote:
Originally Posted by rhino370 View Post
ok got my block back from machiene shop they said since i didnt send any pistons with it they bored it straight 30 over and i would have to finish hone when fitting my pistons, will the bore be more i want to use forged pistons.
I Have seen alot of pistons and a .030 piston has the clearance built into the piston not the bore and certain applications require more clearance.

If that block is bored .030 over and its not honed your in trouble, BBC's should be plate honed for the best ring seal if its a performance build. I see alot of cylinder distortion once the torque plate is bolted on.

Here is a link to plate honing and it was based on a 454 block.
Values Of Torque Plate Honing - Team Camaro Tech
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Old 10-25-2012, 03:19 PM
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CNC...in the link you posted, why does it say you're banned?
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