Here are prices from Scoogin Dickeys website...

Manley Flat Top Forged Pistons:
-Bore: 4.030"
-Stroke: 3.750"
-Rod Length: 5.700"
-Pin Height: 1.560"
-Weight: 482g
-C/R: 11.0:1 w/64cc heads
-Pin Type: P or F (whatever that means)
-Dome volume: -3.5cc
==Price: $479.00==

TRW Flat Top 2VR Forged Pistons:
- Bore: 4.000" w/ +.030" over bore
- Stroke: 3.750"
- Rod Length: 5.700"
- Pin Height: 1.565"
- Weight: 505g
- C/R: 10.7:1 w/64cc heads
- Pin Type: P or F
- Dome Volume: -3.4cc
==Price: $41.00/piston; $328/set==

TRW Lightweight Flat Top 2VR Forged Pistons:
- Bore: 4.000" w/ +.030" over bore
- Stroke: 3.750"
- Rod Length: 5.700"
- Pin Height: 1.430"
- Weight: 497g
- C/R: 10.7:1 w/64cc heads
- Pin Type: P or F
- Dome Volume: -3.4cc
==Price: $30.50/piston; $244/set==

And why are the Lightweigt TRW pistons cheaper than the regular TRW pistons? Im confused...thanks in advance for the help.

 

the price seem to be becuase of the pin height if you notice there diffrent, one might be for the stock 5.7 rod and one for the 6.0 rod. also one might include pins and the other doesnt, i bet the lightweight ones dont.

[This message has been edited by TempesT68 (edited November 26, 2001).]

 

All three are for 5.700" rod lengths....could it have to do with the weight and name?

 

There's some kind of mistake...

Look at the last 2 rods. Note that they say that the stroke and rod lengths are the same, but that the pin height is different. That is not possible. In a SBC, the sum of ½ the stroke, plus the rod length, plus the pin height, must equal 9.025" +.000" -.030". The third piston meets that requirement. The first and second pistons, if you add up all the numbers, come out to 9.135" and 9.14"; that would make the piston top stick out of the block approximately 1/8". Not in my motor thank you. However, if you use ½ the stroke of a 350 (½ of 3.48", or 1.74"), they work out to 9.005" and 9.000" respectively Much happier now. The first 2 are 350 pistons, the third is a 383 piston.

Part numbers would help identify them properly.

The TRW pistons are basically forged heavy-duty replacements; the Manleys are specialty racing parts. If you see them side by side, I think you'd understand instantly why they are so different in price.

P or F = Pressed pin or Floating pin.

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"So many Mustangs, so little time..."
ICON Motorsports

[This message has been edited by RB83L69 (edited November 26, 2001).]

 

Price difference
Could be the Material used.
Skirt design.
If they use a tapered pin.
Ring package design.
Give'em a call, both companies should tell ya what'll work best for your needs.

 

I don't want to knock any manufacturer, but Manley pistons are in the same area as JE, Ross, and SRP. TRW's are "the next best thing", but more than adequate for me. Now to keep everyone happy, this is my opinion. No, I don't have facts from each company to show this. But this is what I believe.



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Joshua Johnston
1991 Z-28
350, T-5, K&N, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust, Dynomax Bullet Mufflers, T&R Motorsports custom air intake, Bald tires