LS7 combination opinions wanted
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LS7 combination opinions wanted This posting is for my friend down here in Australia who has one of the special edition VE HSV's which came with the LS7 engine.
The engine is apart at the moment for some much needed work to get this thing really moving.
The purpose of this build is to be a weekend warrior and not a daily and therefore the engine will be quite aggressive.
This is the combination:
CNC LS7 heads with 62CC chambers Compression is around 13:1.1
MSD intake
3:73 gears
stall converter will be ordered after cam selection is made.
248/262 .680 .665 112 LSA +3
Combo looks good to me but my knowledge is limited.
What do you guys reckon?
The engine is apart at the moment for some much needed work to get this thing really moving.
The purpose of this build is to be a weekend warrior and not a daily and therefore the engine will be quite aggressive.
This is the combination:
CNC LS7 heads with 62CC chambers Compression is around 13:1.1
MSD intake
3:73 gears
stall converter will be ordered after cam selection is made.
248/262 .680 .665 112 LSA +3
Combo looks good to me but my knowledge is limited.
What do you guys reckon?
ASSuming he’s staying with a hydraulic roller? Cam specs look good to me. That’s a lot of compression, which I am a fan of. I’m running 12.42 in my 434. What fuels are available to you guys down there? He left bottom end alone?
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Good thing about the e85 here is that it's consistent all year round with an 85-90% ethanol content.
We have the same fuel as the USA although the octane ratings are different. For example your 93 octane is the same our 98 octane fuel. Different measurements.
And yes it's a hydraulic roller.
Bottom end is stock.
His hoping there will be enough PTV clearance. If not new pistons will need to be fitted.
I like the camshaft selection too.
Looks like the IVC of 53 and EVO of 66 suit the compression he has.
He was telling me something with high compression you need to open your exhaust earlier and extend the IVC a bit later
Should make some crazy power.
I knew of this guy down here who had 17.1 compression NA.
on a 402 he had to extend his IVC to 56 and his EVO to 69 if i remember correctly because of the compression.
Apparently if you don't it can make the engine not perform as well
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4.125" bore
4.000" stroke
62cc Head Volume
5cc Piston Volume (standard flat top with valve reliefs)
.000" Deck Clearance
.051" Head Gasket
8 cylinders
12.2:1 Static Compression
427.65 Cubic Inch
What this calculator does not take into account is:
1) "crevice volume" (distance from piston top to the top ring
2) Head Gasket Bore
You can also try this one. I get the same result.
http://www.csgnetwork.com/compcalc.html
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I would use the T&D adjustable rocker that mounts on the stock pedestal.
MSD is the better of the plastic intake manifold offerings. If you have clearance concerns, I'd run the MSD. What are your goals for the setup?
I made 646whp on a SBE LS7, LME ported stock heads, milled to 63.5cc, cometic .041" headgaskets, a Holley Hi Ram, 243/258 .660/.660 114+3 cam, 1-7/8" headers, and e85. That setup trapped 142.5mph in 2000DA.
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