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Old 04-28-2013, 10:23 PM
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Pistons for 327 blower application

Hello guys,
I'm trying to find forged pistons for my 30 over 327 (331) that with proper quench I can get 8:1 scr. Planning on running a 6-71 yeah maybe a bit big to some degree but reasons is allows me to grow bigger cubes later on using the 6-71 plus i want it out the hood for the wow factor. The lowest scr I've been able to calculate is 8.5 using a 45 quench and 76 cc head. With 6-71 and the smaller 331 I know the blower will have turn real slow to keep boost down to run on pump gas. My 327 small journal block is 75% already prepped as in line hone mains, arp studs. Crank is factory forged turned 10 under polished journals and crank double keyed.. . The only pistons I can find with big enough dish is the old school speed pro 2165 with a 5.4 cc reliefs.. Like to find something with 10-15cc but with limited piston selection now days for the 327, not sure if ill find anything.. If know of any let me know.. Goal is to run 6-8 lbs boost street/ strip build 60/40 if that helps..
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Old 04-28-2013, 10:27 PM
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I could probably get my scr down to 8:1 but my quench area will be to big.. Like 60 tho somewhere around that which I don't want
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Old 04-28-2013, 10:35 PM
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80 cc heads?
contact wiseco for semi custom pistons?
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Old 04-28-2013, 10:58 PM
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80cc? Could do some bowl work I'm sure to get it there. Custom pistons are more expensive but could be my only choice..
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Old 04-28-2013, 11:04 PM
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Small bore or large bore 6-71?
A small bore running -10% will boost a 327 5lbs and that's little enough to use pump gas with 8.5:1 SCR. If you drive the blower faster and make more boost than you should for pump gas, you can always rig up a water/alcohol injection system to prevent detonation. I wouldn't worry about 8.5:1.
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Old 04-29-2013, 12:08 AM
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Thanks tech for the input!. I've heard of the small bore and large bore 6-71 but have never look into the differences to understand them. I'll have to check it out.. Yes water meth as been an idea, just don't how long I can go on a tank of water meth. I have no experience with one, so I don't know much about them other than cooling the charge on pump gas to help prevent detonation.
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Old 04-29-2013, 12:32 AM
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Here is a clean way to do it, use a 1 gal fuel cell, mount it under the hood....
Jaz 250 001 01 Drag Race Fuel Cell 1 Gallon 6" x 6" x 12" | eBay
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Old 04-29-2013, 12:52 AM
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Check out AIS for one, I have their system, they're easy to talk to and will get you exactly what you need. You can adjust the system to inject at any given boost level, it doesn't spray full time. Mine mounts in the trunk along side my fuel cell.

The Best Water injection system and water methanol injection systems at AlcoholInjectionSystems.com
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Old 04-29-2013, 04:11 AM
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Use a KB158 -13cc hyper piston. pay attention to KB's top rng end gap recommendation for supercharged engines.
Relieve the 76cc heads to 80cc. The cr will be

7.65:1 on a 0 decked block and .041 gasket.
Plenty low to run on 92+ pump gas and make very good supercharged power and boost .
Nice street blower cam for your supercharged 327
Crane F278-2 113841

Last edited by F-BIRD'88; 04-29-2013 at 04:18 AM.
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Old 04-29-2013, 07:10 AM
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get a set of flat top pistons and a good set of large chambered heads. With a good chamber design you'll be able to run 8psi with little issue on 93 octane. I would get a ignition retard box, and while mater injection will certainly help you can probably get by without it.

GOOD HEADS mean a lot.

Also, keep in mind that with better heads and a larger cam your boost pressure will go down even though your power is going up- don't be alarmed.


If you're considering larger cubes already, I am wondering why you're even building the 327 to start with. with a blower and good heads 600hp isn't out of the question, but if you want more, why not start there? It'll save you money in the long run.
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Old 04-29-2013, 08:06 AM
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Reason for the 327 is I already have it and block and crankshaft is already prepped which saves a few dollars.. Block 75% ready. Plus it will get me experience with a blower application.. I'm not experienced enough with blown application to try hyper pistons so I will stay away from them.. The forged 2165 speed pro is old school pistons for the 327 but should set me up good with the right heads after a few tips and more search..This will get me started and experience tunning..
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Old 04-29-2013, 08:39 AM
How fast is fast enough?
 
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since you don't have rods, just get a 6.125" rod and a piston for a 350 with a 6" rod. There's a better selection.

A small main 6.125" rod may be hard to find, but in general small main rods of any size are and it sounds like you still need a set.
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Old 04-29-2013, 01:09 PM
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If you don't want to use the hyper pistons which are plenty durable and result on a low low 7.6:1 compression ratio
which allows more boost with more dependability because the supercharged engine does not detonate.

A good next move would be to get a 350 crank and use a standard -22cc D dish L2441F-30 350 piston
(TRW Probe.) Use the 327 crank in something else , or sell it/trade it.
This makes LOT MORE sense than trying to use a odd ball custom piston rod combo.

With the 327 crank you have two good choices. The KB hypers or a JE forged blower piston.
Anything you can do to bust a KB piston will also bust a Forged piston. Just the repair bill will be bigger with the forged piston.
Get your tuning combo in order (carbs, timing) and you will not have problems at all with the KB's and 7.6:1 up to 10psi.
Wrong tuning will kill a forged piston.


You don't need "experience" you need the right street blower motor combo/tune up to start with.
The 7.6:1cr is a critical part of doing this right, reguardless.
You can build a low cost simple 7.6:1cr 327 with the KB pistons that makes all the street power you will ever want
with full street motor reliability (cause it is built and tuned correctly to start with). It will make more real power than even
a larger more expensive blower motor that is not done right. And last longer.
How many blower motors do you need to build.? 5-10 with varying - $$$bad learning experiences$$$-- untill you find out what works and what does not...
(its simple, build this 327 right the first time {starting with the right low 7.6:1cr} and you won't need "more cubes later"

Or 1 simple low cost MORE POWERFULL reliable DONE right street supercharged 7.6:1cr 327. ?
your choice.
What 76cc cylinder head do you plan to use?

Last edited by F-BIRD'88; 04-29-2013 at 01:34 PM.
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Old 04-29-2013, 01:16 PM
How fast is fast enough?
 
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http://www.summitracing.com/parts/es...FUff4AodYBEA-A

here's a rod that will work. you can pick from a long list of pistons whichever you'd like to use with it.
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Old 04-29-2013, 03:15 PM
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Thank you for all the suggestion.. fbird I may consider the kb pistons as you stated.. Just don't know much about their hypers compared to a forged.. The speed pro 2165 are less expensive than Kb hypers but will take the Kb into consideration the 350 crank has cross my mind and have the mains turned down to fit my block, but my crankshaft is already prepped so money ahead there.. As for heads just going with a 882 or 487or 487x with some home porting..guys this is just to get me started, I can up grade later on... Yeah I know these cast heads are not the best, but will get me going for now.. If the point comes down for a set of aluminum heads I will.. I'm realistic here for hp.. Not expecting high hp even tho there is room for improvement.. My main thing is to get started learn the tune and go from there.. Better heads yes down the road but for now the factory heads will do.. Is there hp left on the table? You bet..
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