NOS 400 SBC

[helicoil]

Hello guys Interested in hearing opinions on a tight or wide lobe sep cam for a 400" 23*Track 1 head Full CNC port 317/234 @ .700. 1090 cfm dominator/Super Victor. 12.4:1 comp, .272/.282 @.050" .450" lobe w/ 1.5:1 arms and 108lsa with ic at 108 both int and exhaust,NOS crossbar plate 2 stage spraying 100 off line and 225 on top of the 100 in high gear, maybe sooner this season. PG car with 4.11 and a 4000 stall 3300lb 26x10.5" tire. Wanted to know experiences or thoughts about using a 108 vs 112 or even 114lsa. These heads are flowing between 72%-75% I/E throughout various lifts. Does this combo require a wider lsa to get more exhaust flow? I currently run a 108 lsa and pick up 1.6 sec in et and almost 24mph with it. At the 325HP I saw some traces of detonation when freshening the engine on the rod bearings (loss of crush on a couple cylinders), but never experienced a burnt electrode on a plug or aluminum fragmentation. Rings and pistons looked good except a couple which measured 4.118 to 4.1185 on the skirts. The majority measured 4.120-4.121. These were not the pistons that had the pounded rod bearings however. They are JE SRP 5 cc domes with 1.125" CD 1/16", 1/16", 3/16". I am wondering if I am building too much cylinder pressure with the static, tight lsa, and 325HP shot. I have also read and heard from some that a tight lsa is fine if you have heads moving 80% I/E relationships and that they are O.K. up to a 275HP (about), from that point on the engine may not respond to 300-350HP, where a 112 or 114lsa cam would continue to make power. Any thoughts anyone? Thanks for reading. I am new to the site, and enjoy the sharing of knowledge I read here. Not many experienced racers in the shop I am in. More heavy duty and OE machine work. Need some SBC/N20 resources.......bad!!