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Ok so here it is .... I have some ported 317heads ,ls9 gaskets,LS7 lifters,ls2 timing chain,Ported NNBS Intake manifold,102 throttle body, 6.100 compstar rods and a cam that reads this
will these pistons "Wiseco Forged Pistons 6.0 4.005 Bore 3.622 Stroke +3.20cc flat top K398X05" work for this set up? Planning on running on e85...thank you in advance.
By the way did the compression calculator and it shows I'll be at 9.54:1
What part number rod do you have? Your pistons are designed for a 6.098” rod length, although .002” longer rods (6.100”) won’t affect much as long as you measure your out of hole dimensions correctly, allowing for piston rock of course. Those same pistons have a .927” pin diameter, which is why I asked what part number rod you purchased. Most Compstars rods are set up on the small end for a .943” pin. Biggest dilemma these days is matching rod pin diameter to piston pin diameter for the LS stuff.
Those rods have a .928” pin bushing, so you should be fine. Keep in mind your compression height is a tad tall, which pushes the top ring toward the chamber a bit, but set up properly, I think you’ll be ok. Do your due diligence during mock up and check ptv as well as quench. You running this N/A?
Those rods have a .928” pin bushing, so you should be fine. Keep in mind your compression height is a tad tall, which pushes the top ring toward the chamber a bit, but set up properly, I think you’ll be ok. Do your due diligence during mock up and check ptv as well as quench. You running this N/A?
Well I wanted to do a 370 boost motor at first but then got all these parts on a deal and well a buddy told me he had these piston . That he never used and would let them go for 500 . So now idk what to do . And as for the cam . I dont think it's a boost friendly cam. Tried looking for it on line and no luck. By the way thank you for taking time and replying to me.
Just a WAG, but I bet that was spec'd by Martin Smallwood of Smallwood Racing Development (SRD). The numbers on the back look like duration and then lobe lift, so possibly 248/264 duration with .365"/.355" lobe lift and a 114LSA with 4 degrees advance built in. It's not ideal for a boosted engine IMO.
Just a WAG, but I bet that was spec'd by Martin Smallwood of Smallwood Racing Development (SRD). The numbers on the back look like duration and then lobe lift, so possibly 248/264 duration with .365"/.355" lobe lift and a 114LSA with 4 degrees advance built in. It's not ideal for a boosted engine IMO.
Yeah i figured will it still work on a n/a set up?
Yeah i figured will it still work on a n/a set up?
It would work but not very well. It has a very late IVC event so It would want to make power at a higher RPM than what your intake will support. It also has a pretty significant amount of overlap for a 6.0L so it would sound pretty rowdy, but again, it won't be helping you much with the setup you have. Basically the engine would be all bark, and no bite.
It would work but not very well. It has a very late IVC event so It would want to make power at a higher RPM than what your intake will support. It also has a pretty significant amount of overlap for a 6.0L so it would sound pretty rowdy, but again, it won't be helping you much with the setup you have. Basically the engine would be all bark, and no bite.
You think it will be better on a 408 stroker 10.1 compression
You think it will be better on a 408 stroker 10.1 compression
Better? Yes. Trying to build an engine around a camshaft is tough to do. It works out better having a camshaft built for the application, not the other way around. You are gonna run E85, so I’d go at least 12 on compression, maybe 13 or 14. Lots of guys run 14:1 on E85, but your camshaft designer needs to know exactly what your doing with compression.
Better? Yes. Trying to build an engine around a camshaft is tough to do. It works out better having a camshaft built for the application, not the other way around. You are gonna run E85, so I’d go at least 12 on compression, maybe 13 or 14. Lots of guys run 14:1 on E85, but your camshaft designer needs to know exactly what your doing with compression.
Ok thanks yeah i got a 408 on my truck thats getting rebuilt. And i lost the cam sheet of the cam So i idk what size it is .
Can’t seem to find any rod that will work with a .945 pin piston. Was wondering if I could by any chance just make the switch to a .927 pin piston with no drawbacks? Engine is a 2003 6.0 LQ4.
06-29-2019, 01:30 PM
Lq4 build HELP 
