I fianally got to the track with the Imp with the new .40 over motor. Here is a list of the internals:
.40 over bore
GM forged 4340 crank
Eagle I beam rods
SRP forged flatop pistons
CNC ported iron heads with 2.05/1.60 valves with CC978-16 valve springs
267cfms intake/206cfms exhaust @.550 lift
Comp Cams 224/230XE on Comp Cams SA Pro Mags 1.6 rockers .536/544 lift
Comp R lifters
52mm throttlebody
MSD6AL
AFPR
LT4 ED timing set
Mezeire EL pump
Built 4L65E
Super Yank 3500 stall
GM 4.10 gears
6200 rpm shift points
Stock supension except for hochtkis lower/upper control arms
Mickey Thompson 275/60/15 drag raidials @15psi
I made 6 runs 4 were between 13.05 and 13.08 @105
The best run was 12.94@ 105
Here is the breakdown:
.095 reaction
1.77 60ft
8.24 1/8 @83.003
12.94 1/4 @105.70

Is is good or is there still room for improvement. I spun off the line everytime. Track prep was terrible. I am running a PCMFORLESS tune. I know Ii can get more ponies from a dyno tune but I really was not real happy with the results of the runs, but I have got remember I run a 4400 lb car. All runs were on open exhaust. Tell me your opinions.
HVY SS

 

Its going to be hard to relate your times to personal experience.. You have about 1000 lbs of everyone in here.

 

Yah I know. But I still think I'm off somewhere. May just be me.
HVY SS

 

i dont know how accurate the 1 tenth to 100 pounds with that much of a difference, but if thats the case you would be running a low 12 if that was an fbody, so i say thats pretty good for what you have done.

 

The times sound good to me, you have to remember suspension plays a huge part in your 1/4 mile run. Rather than getting a dyno tune right off, get your car dynoed and see if the numbers satisfy you.

 

1 out the hole will give ya 2 at the other end. The engine sounds strong but a dyno tune will give ya more. May need a gear change and ya didn't say what ya were shifting at. May need to go higer to see the effect of your cam.Your heads will support about 550FWHP.Get rid of the Comp lifters and go back to stock.They will take ya to 7000RPM's and 550FWHP no problem. To many problems with adjustment and reliabality. Ya can adjust the stock ones at 1/8 turn and do the same thing if ya got the right springs.
An F body would be in the high 11's or low 12's with that engine. Like I said heavy car lower gear to get it moving and keep at least 20-25PSI or more in your DR's.