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.020 overbore : Approx hp/tq gains on 4.6

Old 11-04-2006, 06:58 PM
  #31  
droptoppony
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Default RE: .020 overbore : Approx hp/tq gains on 4.6


ORIGINAL: JD1969

I can see where the 2v heads won't really allow much of an advantage from increased stroke. I suppose that the big bore kit might work better because the increased bore will help unshroud the valves and allow the heads to move a little more air. Oh well more proof that F/I is the way to go with a 2V.
On a N/A 2V the strokers don't pick up much hp because the stock stroke is already = to that of a 351 and the bore is only 3.552...i have seen h/c/i 2V's with a stroker only gain 10hp and 20tq but on FI the stroker seems to be a bit more receptive. A guy over on MD/MPH (Jim Fitz) mentioned that he gained 50+ hp when adding his stroker to his KB'd 2V but he has a nasty setup.

Now the Big Bore (3.7) with a similar h/c/i N/A will gain a solid 30-40hp and tq as per the tests Modular Performance did a few years ago. They showed 20hp gains on a stock h/c/i 2V with just the Big Bore kit....so thats why people tend to not go stroker.
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Old 11-05-2006, 02:50 AM
  #32  
lucki96gt
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Default RE: .020 overbore : Approx hp/tq gains on 4.6

I bet a 4v big bore stroker with ported heads and some cams would give pretty numbers, esp. with a K.B.!!
Now thats a build.
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Old 11-05-2006, 02:46 PM
  #33  
droptoppony
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Default RE: .020 overbore : Approx hp/tq gains on 4.6


ORIGINAL: lucki96gt

I bet a 4v big bore stroker with ported heads and some cams would give pretty numbers, esp. with a K.B.!!
Now thats a build.
I think thats what the VT car is but NA and its in the 9's...
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Old 11-05-2006, 11:15 PM
  #34  
Nadelle
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Default RE: .020 overbore : Approx hp/tq gains on 4.6

How Does this motor differ from any other? A bigger bore means more power! It Might not be huge number but it does give some
lets do the math.

4.6 bore and stroke

3.55x3.54 =281 ci (3.55x3.55x3.54x8x.7854=280.5)

With a .020 bore increase
3.57x3.57=283.4ci (3.57x3.57x3.54x8x.7854=280.5)

2.4 CI means about 2.4 hp
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Old 04-21-2019, 01:01 AM
  #35  
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Default Why woudnt it. Increase power .20 over bore

I read an article and saw a video of a 2v mustang n/a. Worked heads stage 3 comp cams bored .20 over. And some exhaust mods and made 400 hp .
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