LT4 heads are195cc with 2.00/1.55 valves. Their smallish chambers have them at 10.8:1 with the flat top piston. The cam is 203/210 @ .050 and they run 1.6 roller rockers from GM.

I have 205cc...

I have never run this engine on 87. Even STOCK on the stock tuning it had knock retard on 87 octane. The GM 395 Marine cam made it worse at 9.6 static. It was about 8.4:1 dynamic. I have had this...

Running the numbers in my setup has an IVCL of 33.5° ABDC @ 0.050 and 61° ABDC @ 0.006. Static compression calculates out at 9.41:1 and Dynamic is 8.36 as calculated by Silvolites calculator. Heads...

Block is a stock deck, 2005ish GM 1-ton Vortec 350 crate engine. Hecho en Mexico. Where are you calculating your quench from? The top of the piston recess? My pistons are 0.025" down. The GM ZZ4...

Very similar to what I am working with in the Express van. I kept the 12cc factory pistons though. Assault racing 205cc heads I bought bare and built. Custom grind 215/224 @ .050 comp cam on a 110...

I have never once used seperate VE table or Spark values at idle. I found them an annoyance. Even on my 0411 both idle tables and the main table have the same values.

You are going to have a hard time making 400 hp under 6,000 rpm on a 350 that mild.Pulsewidth to stay under 80% duty cycle goes from 5msec at 5,000 to 4 msec at 6,000. If it takes 500 usec to open...

Personally I wpuld run the big block injectors at that power level. I have run the 61s as high as 50 psi but the opening and closing times start to get too long for higher rpm use.