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Old 07-18-2007, 07:49 PM
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6-71 blower 383 build

hi whats up uys ive got a 350 4 bolt main block,(383) eagle rotating assembly from cnc motorsports for forced induction engines, forged non twist steel crank, h-beam rods je pistons 8.5:1 compression with 64 cc chambers i havent purchased heads camshaft or carbs yet, what are your ideas guy?,this will be street driven but rarely, not more than 10 miles at a time, im leaning towards a flat tappet cam, does comp have something in their selection or should i have one custom ground? as far as cylinder heads i like the dart pro 1's would 215's or 230's be better? 64 or 72 chambers? (compression with 72 is 7.8:1) what about carbs? what is my power potential while keeping fairly good street manners? i am in the very early stages of this project any advice would be helpful, thanks.

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Old 07-18-2007, 07:58 PM
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I have a very similar engine in my T bucket. I used 2 1405 Edelbrock carbs and Summit hyd cam. The engine idles at about 1000 rpm and has plenty of power.

http://store.summitracing.com/partde...7&autoview=sku
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Old 07-18-2007, 08:04 PM
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Dart makes good heads, but before you buy, look at rhs heads, they make very good iron and alum. heads, that will run dead nuts to any of darts heads, at a lower price. As for a cam, I would call comp and talk to a tech guy, that way he can come up with a grind taylored to you application. Half the time they reccommend a cam right out of the catalogue.
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Old 07-18-2007, 08:38 PM
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The Revolution Begins !!!

The New Freedom Series SBC & SBF Heads by Patriot Performance !!!

Freedom Series SBC 23 Degree Heads






*
Aluminum Heads...at Iron Prices !!
*
190cc CNC Bowl Blended and Gasket Matched
*
2.02"/1.60" 1-Piece Stainless Valves
*
.575" Hyd. Flat Tappet Springs (will work on smaller Hyd Roller cams)
*
3/8" Studs and Guide Plates
*
Steel Retainers

These heads offer exceptional quality at an unbelievable value !!


MSRP

2180


SBC 190cc Freedom Series 2.02"/1.60"/64cc Assy Angle Plug


$795.00 Pair

2181


SBC 190cc Freedom Series 2.02"/1.60"/64cc Assy Straight Plug


$795.00 Pair

http://www.patriot-performance.com/w...p?x=1&DID=1225


Car Craft tested them and they perform with (within 3 hp) vortecs modified for higher lift and screw in studs

Shane
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Old 07-19-2007, 07:07 AM
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Quote:
Originally Posted by Chevrolet4x4s
The Revolution Begins !!!

The New Freedom Series SBC & SBF Heads by Patriot Performance !!!

Freedom Series SBC 23 Degree Heads






*
Aluminum Heads...at Iron Prices !!
*
190cc CNC Bowl Blended and Gasket Matched
*
2.02"/1.60" 1-Piece Stainless Valves
*
.575" Hyd. Flat Tappet Springs (will work on smaller Hyd Roller cams)
*
3/8" Studs and Guide Plates
*
Steel Retainers

These heads offer exceptional quality at an unbelievable value !!


MSRP

2180


SBC 190cc Freedom Series 2.02"/1.60"/64cc Assy Angle Plug


$795.00 Pair

2181


SBC 190cc Freedom Series 2.02"/1.60"/64cc Assy Straight Plug


$795.00 Pair

http://www.patriot-performance.com/w...p?x=1&DID=1225


Car Craft tested them and they perform with (within 3 hp) vortecs modified for higher lift and screw in studs

Shane
Yes I forgot to mention the heads.... Here are the heads I have.

http://cgi.ebay.com/ebaymotors/PATRI...mZ260139061388
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Old 07-19-2007, 10:51 AM
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Using the large(er) chamber heads will allow more blower boost and more power on pump gas with less spark retard. You'll be able to make the most power on pump gas.

Crane has very good off the shelf hyd cams in their PowerMax series that are very blower friendly. are dual pattern grinds with wide(er) LSA

Crane # 113801 H-278-2 222-234@.050-.467-.494 114LSA easy street manors. mild idle strong torque right off idle with a blower to 5700rpm. Easy to live with.
Could try 1.6 rockers on the intake side. 1.5 on the exhaust for even valve lift. will work fine with a stock converter but great with a 2800-3000stall
Great on the small B&M 144 supercharger

Crane #114051 H300-2 238-246@ .050 .480-.495 112LSA more top end a rougher idle still a nice street blower cam. needs a 3000 stall converter.

Crane #114571 H308-2 246-254 @.050-.495-.510 112LSA most power more rpm, high boost ratio 3500+stall and gear. 6000+rpm rough idle Takes no prisoners.
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Old 07-19-2007, 08:06 PM
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well ive been reading up on my "secrets to street supercharging" book and ive also seen it many many times on here, i think im going to send my 6-71 and go with an 8-71 (less heat and wont have to spin it as much) which leads me to my next questions does anyone know anythng about these guys? http://www.dyersblowers.com/1694.html pretty good prices but i know you "get what you pay for" sorry for the ongoing questions but i want to get this right the first time
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Old 07-19-2007, 10:07 PM
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In a street blower application with a 350ci or 383ci motor you're better off with a 6-71.
It will use a higher drive ratio to get a pump gas friendly boost (8 to 12lbs) resulting in higher low/mid rpm boost and power where a street car can use it the most.
The boost will come in quicker.
If you were racing with Alcohol or a BBC the 8-71 would have an advantage.

http://www.blowerdriveservice.com/
http://www.hamptonblowers.com/
http://www.oddysracingengines.com/

Last edited by F-BIRD'88; 07-19-2007 at 10:23 PM.
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Old 07-20-2007, 06:41 AM
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Dyers make a very blower kit. I used several and had good luck with all of them. Hard to beat. Price is pretty reasonable too.

I use the whole kit unless you've done this before. He has the carbs setup for the blower so you only have to do some minor tuning.

6-71 is plenty for a SBC.

If you have E-85 available consider setting it up for this as it is about 105 octane rating or better and $2.45 per gallon.
This guy does a great job onthe conversion. I wish you could see his blown Nova. It runs so good you can hardly tell it is blown.
http://www.e85carbs.com/index.htm
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