331 I'm lost..

SR86

Founding Member

Dec 4, 2001

146

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Alberta, canada

Dec 24, 2006

#1

• Dec 24, 2006

• #1

OK, never done much engine building, and from the searches, it seems everybody does somthing different. but - Do I have this right -

the 331 CAN use a stock bore, but usually uses a specialized piston?
There will be notching of the cylinder walls to allow the crank adequate room to rotate?
Stock crank journals, and rod journals?
Needs specialized 331 specific rods?

Ok, now my current Combo is Edelbrock Aluminum heads, 190 intake, approx 170cc intake runner, 64cc chambers,E-303 cam, 1.7 roller rockers, Typhoon upper and lower, and pro products 75mm TB, 1-5/8 long tubes..your basic bolt ons.

I'd like to use my exisiting heads, get a new cam, and buy a rotating assembly. this is all going into a t-5 backed Ford Ranger, 2 wheel drive. Shes currently in the low 14's, I'm hoping for quite a bit more...it is a street truck, but not a dailily driver, but streetability is important. Guide me Stangers!

 

tording

Founding Member

Nov 11, 2000

164

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Hampton, VA

Dec 24, 2006

#2

• Dec 24, 2006

• #2

I ran a 331 with a twin setup. to get a 331 from a 302 block you need a 3.25 stroke and a 4.030 bore so the bore needs to be .030 bigger than normal. I am pretty sure that without the .030 bore you get a 326 or 327, something like that.
You do need aftermarket pistons because of the bigger bore and as far as the rods I have always seen a 5.400" rod used. You might be able to use others but that is the most common I have seen. You are correct about the walls needing to be notched to allow that bigger crank to sling around. I don't see why you wouldn't be able to do what you want to do. Sounds pretty reasonable to me and would be pretty streetable. Here is a site that you can play around with the bore on. http://www.aacncclub.com/crucemotor/compressionratio.html

 

onefstsnake

New Member

Nov 25, 2005

792

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Northern VA

Dec 24, 2006

#3

• Dec 24, 2006

• #3

you could do a long rod stroker. Which basicly means your increasing the stroke. But I dont think you could do a 331 with stock bore...

 

D

Daggar

New Member

Jul 19, 2004

3,902

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Dec 24, 2006

#4

• Dec 24, 2006

• #4

I run a Dart based 327. Same as a 331 with stock diameter slugs.

 

tording

Founding Member

Nov 11, 2000

164

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Hampton, VA

Dec 24, 2006

#5

• Dec 24, 2006

• #5

yeah, they have confirmed what I said. a 3.25 stroke with a 4.0 bore is a 327, that calcualtor I posted confirms it too.

 

SR86

Founding Member

Dec 4, 2001

146

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0

Alberta, canada

Dec 24, 2006

#6

• Dec 24, 2006

• #6

ok, so no special piston is required, opposed to the 347?

So, I can use some .040 over pistons that i bought before thinking of stroking, buy the aftermarket rods, and crank, have the needed machine work done, and bolt it back together? (it will be around a 333 when it's forty over though)

Any suggestions on who to buy from? is it easier to just buy a short block assembled?

 

tording

Founding Member

Nov 11, 2000

164

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0

Hampton, VA

Dec 24, 2006

#7

• Dec 24, 2006

• #7

When I got my 331 I bought the shortblock assembled from fox lake power products. The only thing about going .040 over is the weakness of the stock block if your using the stock block. I have always heard and thought myself that you don't want to go over a .030 overbore with the stock block. The webbings are already weak enough and you don't want to make it any weaker than they already are. I am sure you would be fine at .040 over but just something to think about. I really enjoyed my experience from fox lake power products and would recommend them if your going to go that route.

 

F

FullAuto

Founding Member

Aug 29, 2002

157

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16

Midwest City, Ok

Dec 24, 2006

#8

• Dec 24, 2006

• #8

You have to use a 331 specific piston. You can't just use a 302 piston with a longer stroke crankshaft. It's a different crank, different rod and different piston. If you want a 331, buy a kit. I know where there are Scat stroker kits for $899 shipped. With a cast steel crank, forged I beam rods w/ ARP bolts, Probe forged pistons, rings and bearings, that's a great deal.

 

W

wicked84gt350

New Member

Aug 20, 2006

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West palm bech florida

Dec 24, 2006

#9

• Dec 24, 2006

• #9

onefstsnake said:

you could do a long rod stroker. Which basicly means your increasing the stroke. But I dont think you could do a 331 with stock bore...

Click to expand...

Rod lenght has nothing to do with stroke the stroke is dertimed bu the distance from the center of the main journal to the center of the rod journal. changing rod lenght just moves the pistion up further at tdc and not as far down at bdc.

 

SR86

Founding Member

Dec 4, 2001

146

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0

Alberta, canada

Dec 25, 2006

#10

• Dec 25, 2006

• #10

Full Auto - That sounds like a pretty good deal..where is that from?!

Thanks for your replies guys; keep the advise comming!

 

S

SteedaFox91

New Member

Dec 19, 2005

25

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Rhode Island

Dec 25, 2006

#11

• Dec 25, 2006

• #11

Subscribing.. I'm intersted on hearing where these Scat kits are at a price like that. Thanks

 

F

FullAuto

Founding Member

Aug 29, 2002

157

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16

Midwest City, Ok

Dec 25, 2006

#12

• Dec 25, 2006

• #12

PMs about the Scat kits sent.

 

retro50

New Member

Jul 15, 2003

191

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Plymouth,MA

Dec 25, 2006

#13

• Dec 25, 2006

• #13

The 331 kits are for a .030 bore on stock or aftermarket 4.00" bore blocks. They use either a long rod 5.400" or short rod 5.315" They both use a 3.250" stroke. They both use different compression height pistons. the 5.400" rod uses a 1.175" compression height piston. The 5.315" rod uses a 1.250" compression height piston. The 5.400" rod had the wrist pins in the oil ring. The 5.315" rod does not. The Standard bore version 4.00" will be 326.7 cubes, .020 over will be 329.9 cubes, .030 over will be 331.6 cubes, .040 over will be 333.2 cubes, .060 over will be 336.6 cubes. The length of the rod has nothing to do with cubic inches. It is the Bore and Stroke that determine engine size.

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

95

99

PA

Dec 25, 2006

#14

• Dec 25, 2006

• #14

Most of your newer style stroker kits for a 331 use the 1.175ch piston with the non intersecting wrist pin, the 347 kits are made both ways. The oil burning myth is just a myth, assembled properly it does not matter.

I build with the SCAT kit mentioned, it is a nice kit for the money

 

F

FullAuto

Founding Member

Aug 29, 2002

157

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16

Midwest City, Ok

Dec 25, 2006

#15

• Dec 25, 2006

• #15

The 347s are made both with the more standard 5.4" rod and 2 different shorter rods that I know of. The Probe/CHP uses a 5.315" rod and the Scat uses a 5.325" rod. They both use the same piston.