LQ9 408 forged need Supercharger advice

[protour_chevelle]

Finally pulled the trigger but have question about compression for supercharged application.
Have new -11 cc Wiseco pistons 4.070 and 64.5 cc heads, stock stroke 3.622 and rod length 6.098, with BTR stg2 Positive displacement cam. 227/242 .614"/.592" 122+6. Im at a static compression ratio of 9.94:1 and a dynamic compression ratio of 8.54:1, is this too much compression for 8-10lbs of boost with intent for 12 lbs on E85?

I'm already to send my knock off LS3 heads(PCE), 65.5cc, to Terry over at Wilkes Perf. for full CNC porting and 5 axis valve job and he said he could easily CNC my Wiseco pistons to -15 cc no problem netting me 9.55:1 static and 8.21:1 dynamic, am I splitting hairs at this point?

Is it better to have more compression than boost to keep timing or more boost than compression and sacrifice timing? NOT an max effort build, strictly street weekend duty 300mi loops. using crappy Calif 91 octane swill and stupid hot 100 degree summer weather (will use octane booster for sure)

Scored a new Whipple 2.9 "hot rod kit" for $5100", picked up 6.0 ls2 bare block for $650 from Steve, owner at Race Engine Dev in Oceanside for full Darton dry sleeves, 4.070 bore, $1995 ttl 2655

Id stick to 9.5:1 with the crap fuel and the heat.



More boost/less timing to make the number.

[MAGONSTERZ68]

Id stick to 9.5:1 with the crap fuel and the heat.

More boost/less timing to make the number.

More boost less timing was a consideration and still on the table as haven't sent pistons off to get cnc'd from -11 to -15.
I spoke to Paul Williams and of course he likes more timing than boost for street applications stating it will feel punchier on the bottom end where it will live majority of its time.
I always thought more boost less timing as well but of course for the application which is 100 percent street DD he may have a point.

thanks for the input,

[MAGONSTERZ68]

Well it happened, the snow ball effect!
Santa was good, got holley max x for Christmass, gutted original PSI harness cleanly from every connections and rerouted Holley harness through original opening.
Wired in vapor works dual pump, pwm, return less fuel pump system.
Now in the process of connecting all the sources, fan triggers, whipple GM map and IAT, WOT A/C cut out to VA unit and last but least speedo/cruise control signal, etc.... Fun fun fun.
Of course block is still at machine shop for Sleeves so asked them to change up to 4.125 sleeves which means i sent my 4.065's back and re order new slugs, smh. why not at this point.