Question about 96" to 103" BB upgrade?
#21
03-24-2021 | 03:12 AM
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Cruiser
Joined: Nov 2018
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From: Mississauga
If I do a big bore upgrade from a 96" to 103". Is there any Benefit in the way of noticable power gain when going to the biggest over sized pistons .010" over or would I be better off to stay with standard bore for durability and cooling?
I do like the idea of keeping the cylinder walls as thick as possible. I know you can take the stock bores to 107" but again I worry about reliability and longevity of my motor...not to mention that I would have to reeplace the entire cylinder if I had mine bored to 107" and needed to go oversized in future as opposed to a small oversize boring..
I do like the idea of keeping the cylinder walls as thick as possible. I know you can take the stock bores to 107" but again I worry about reliability and longevity of my motor...not to mention that I would have to reeplace the entire cylinder if I had mine bored to 107" and needed to go oversized in future as opposed to a small oversize boring..
S&S 106 BB
S&S crankshaft
S&S oil pump and cam plateJim's Powerglide II liftersS&S cam chain tensionerFueling 543 cams
103 ACR heads (stage 2) 1.9 intake valve etc.. AV&V valves with VSK600S valve springs. Done by JPrecision in Quebec.
my hope is that if I want to go to a higher lift cam later I will have future proofed the build a bit...
Now to the question, I don't know anything about the Jim's Powerglide II lifter or the higher lift spring being used by the head porter. The lifter was the recommended one from the guy doing the rebuild.
Is it any good? How will it perform with the Spring in the heads being used?
#23
03-24-2021 | 11:03 AM
HDF Community Team
Joined: Jun 2006
Posts: 12,282
Likes: 2,249
From: san antonio
Hey djl!
I do know the heads are the SE ported, not sure of the technical questions. This is my first full build so I’m kinda flyin by the seat of my pants. Have been doing a lot of research and think this might make a good combo. I was just lookin fer some lower range HP/TQ, hope I’ll get what I’m lookin fer! I think fer the dollars the two lefty bearings will handle what I’ll end up with just fine🤷🏼♂️
I do know the heads are the SE ported, not sure of the technical questions. This is my first full build so I’m kinda flyin by the seat of my pants. Have been doing a lot of research and think this might make a good combo. I was just lookin fer some lower range HP/TQ, hope I’ll get what I’m lookin fer! I think fer the dollars the two lefty bearings will handle what I’ll end up with just fine🤷🏼♂️
#25
03-24-2021 | 03:39 PM
HDF Community Team
Joined: Jun 2006
Posts: 12,282
Likes: 2,249
From: san antonio
Never used the Jim's lifter your referenced in your last post so can't comment; Johnson Hy-Lifts with pin oiling from Larry's Machine seem to be the "go to" lifter these days. The VSK 600S springs are straight double wound. I would have selected the VSK 600 beehive springs with a little less open pressure.
#26
03-24-2021 | 04:37 PM
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Cruiser
Joined: Nov 2018
Posts: 128
Likes: 8
From: Mississauga
Never used the Jim's lifter your referenced in your last post so can't comment; Johnson Hy-Lifts with pin oiling from Larry's Machine seem to be the "go to" lifter these days. The VSK 600S springs are straight double wound. I would have selected the VSK 600 beehive springs with a little less open pressure.
Is that pressure that those springs come with problematic?
How does the spring pressure differ from the stock 103 springs or for that matter the springs in a 110.
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