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Author Topic: 289 VS 302 PISTONS, ARE THEY INTERCHANGEABLE  (Read 295 times)
BCOWANWHEELS
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« on: February 08, 2018, 05:09:49 am »

I,VE GOT A N.O.S. SET OF TRW 12.5 TO 1 FORGED PISTONS WHICH I,AM ALMOST SURE THERE FOR A 289 AND I WAS WONDERING IF I COULD USE THEM IN A 302 WITH STOCK 302 CRANK AND RODS. 1969 351W HEADS RACE PREPED, TUNNEL RAM N 2 - 660 HOLLYS .
THANKS
BOB
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I BELIEVE IN JOHN 3:16
juiced coupe
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Big Block
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« Reply #1 on: February 08, 2018, 06:55:55 am »

289s and 302s use the same pistons. The stroke difference is offset with rod length.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
danford1
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« Reply #2 on: February 08, 2018, 03:14:07 pm »

The stroke difference from a 289 (2.87" stroke) to a 302 (3.0" stroke) is from a different crank shaft.
Danford1
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Those who say it can't be done should not interrupt those that are busy doing it.


Dart 376 SHP block, 4.155" bore, 3.47" stroke, Woody custom cam, TFS 11R 205, ported Vic Jr, 750 mechanical carb. 1 5/8" Hedman headers. 517 Flywheel hp, 498 Flywheel tq.
juiced coupe
Six figures worth of don't give a f*ck
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Big Block
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Location: Pascagoula, MS
The land mass between New Orleans and Mobile


« Reply #3 on: February 08, 2018, 03:53:49 pm »

The stroke difference from a 289 (2.87" stroke) to a 302 (3.0" stroke) is from a different crank shaft.
Danford1

Umm, okay.

Thats why I said that Ford used different rod lengths to account for the stroke difference, in order to use the same pistons.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
danford1
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Location: White Lake, Michigan

« Reply #4 on: February 08, 2018, 06:01:04 pm »

Sorry, my bad. I read the reply fast and what I "thought" I read was was the rod made it have more stroke. After reading what was written, I see my mistake.
Yes a 289 needs a new crank and new rods to become a 302 with stock pistons.
Thank you.
Danford1
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Those who say it can't be done should not interrupt those that are busy doing it.


Dart 376 SHP block, 4.155" bore, 3.47" stroke, Woody custom cam, TFS 11R 205, ported Vic Jr, 750 mechanical carb. 1 5/8" Hedman headers. 517 Flywheel hp, 498 Flywheel tq.
BCOWANWHEELS
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« Reply #5 on: February 08, 2018, 09:12:26 pm »

SO MY PISTONS  THAT I BOUGHT FOR A 289 WILL WORK IN MY 302 IF I USE 302 RODS AND CRANK RIGHT.
THANKS
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I BELIEVE IN JOHN 3:16
juiced coupe
Six figures worth of don't give a f*ck
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Big Block
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Location: Pascagoula, MS
The land mass between New Orleans and Mobile


« Reply #6 on: February 08, 2018, 09:36:45 pm »

SO MY PISTONS  THAT I BOUGHT FOR A 289 WILL WORK IN MY 302 IF I USE 302 RODS AND CRANK RIGHT.
THANKS

Yes.
Logged

Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
289nate
"IL BUONO"
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« Reply #7 on: February 08, 2018, 11:15:27 pm »

What they said is correct.  Look at the compression height of 302 and 289 pistons.  They will each be 1.6.

Some people do use a 289 rod with a 302 crank and just have the top of the piston milled to make up for the longer rod.
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\'65 fastback pump gas 289, 4.56 gears, and faceplated T5.  11.123 at 122.4
BCOWANWHEELS
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« Reply #8 on: February 13, 2018, 06:10:47 pm »

thanks fellas
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I BELIEVE IN JOHN 3:16
BirdMan
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« Reply #9 on: February 18, 2018, 09:44:43 pm »

289 And Boss 302 uses 5.155" length rods, normal 302's used 5.090" length rods.

Normal 289/302 rods use 5/16" rod bolts.  People have honed rod bolt holes oversize to 11/32" and used Chevy rod bolts.
289HP and Boss 302 use 3/8" rod bolts.  289HP rod bolt heads were rectangular while the Boss rod has oval/football shape heads.
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