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I believe that Jim Kennedy, Paradise Performance, Matoon, ILL, has witnessed power up near there with those kits.
We have clients out there, that in fact, have 145/145 with either a re-worked 120R, or our hand-built 120"s(4 1/2" stroke, 4 1/8" bore).
Robin Theim, tuner, at Gails HD, Grandview, Mo, runs our heads on his 120.
145/145 as told to us by him.:)
Scott
 

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Here's one we did rebuild 120 with Mva re worked heads
Andrews 64
New Dragula 2
Custom Pistons
This one need alittle more compression . In my OP
But customer was happy
 

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Some more head work and a better cam than that 259e would get you what you are looking for. If that's whats in your stage IV kit. But if you are getting 110 now that's not bad for Stage 4. I just tuned one for local dealer with stock head pipe no catt Stage 4 and Cobra mufflers it made 103 hp and 106 tq.



M
Nice! Looks like fun! I don't need that much HP. I get about 110 out of my HD 103 w/SE Stage IV Kit. I could stand 10-15 more.


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Discussion Starter · #10 ·
Some more head work and a better cam than that 259e would get you what you are looking for. If that's whats in your stage IV kit. But if you are getting 110 now that's not bad for Stage 4. I just tuned one for local dealer with stock head pipe no catt Stage 4 and Cobra mufflers it made 103 hp and 106 tq.







M

They claim that 103hp is about normal for a stage IV. I have whatever cams come with the street stage IV Kit, not the race Kit. It doesn't come with injectors either. I have V&H power duals with 4" Rineharts.


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The one we just tuned Was Stage 4
58mm
Stock injectors
103 SE kit
Stage 4 heads 1.87 in Stock Exhaust V.
Stock head pipe No cat
Cobra mufflers 1.75 baffles
SE tuner

Ill be honest I have never seen great number with this kit.
We Tuned one with Woods 555 and Thunder header
105 HP 112 Tq It had
Stock Throttle
Stock Injectors
103 SE kit
And Stage 4 head
Thunder header
We bent the baffle on Thunder header to help get rid of dip. Lost a little top end with that.


They claim that 103hp is about normal for a stage IV. I have whatever cams come with the street stage IV Kit, not the race Kit. It doesn't come with injectors either. I have V&H power duals with 4" Rineharts.


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Discussion Starter · #12 ·
The one we just tuned Was Stage 4

58mm

Stock injectors

103 SE kit

Stage 4 heads 1.87 in Stock Exhaust V.

Stock head pipe No cat

Cobra mufflers 1.75 baffles

SE tuner



Ill be honest I have never seen great number with this kit.

We Tuned one with Woods 555 and Thunder header

105 HP 112 Tq It had

Stock Throttle

Stock Injectors

103 SE kit

And Stage 4 head

Thunder header

We bent the baffle on Thunder header to help get rid of dip. Lost a little top end with that.

Very similar to my setup:

58mm
Stock injectors
Stage 4 kit
V&H power duals
Rinehart 4" slipons
SE air cleaner w/58mm backplate
PCV


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