habibtoday

Hi Guys

i need your advice on my friend's project :

before he used on his corvette c4:

stock ls7 engine + High lift cam + Q.F 1050 carb. + GM intake
(1/4 mile ET =9.6)

Currently his project is :

lsx 454 + stock ls7 heads + High lift cam + GM intake + Q.F 1050 carb
compression around 11.5
(1/4 mile ET =10.2)

finally 10.2 ?? is it logical ??

Noyzee

iTrader: (37)

lots of things come to play. more motor etc doesnt meen better et's. if the combo isnt working together right, cam installed wrong, tune up off, cam not speced good with heads, lots of things. to much cam, could be colapsing lifters and loosing power. lots of things could do this

habibtoday

i think you are near from the problem

the cam wich he used is custom made especially made for the previous engine wich is stock ls7

can you advice me wich the best cam for this spec.

KCS

iTrader: (20)

What are his 60' times and MPH?

habibtoday

60 feet = 1.422
330 = 4.211
660 = 6.531
kmh = 170.55
990 = 8.521
1320 = 10.208
kmh = 213.62

these are time slip's information

KCS

iTrader: (20)

What were they with the 9.6 1/4 mile? Need to compare.

habibtoday

i think


60 feet = 1.33

1/4 mile et = 9.6
kmh = 224

fuel

iTrader: (13)

the car needs to go on a dyno....and the tune mabe wrong

KCS

iTrader: (20)

Right off the bat, it's odd that you lost ~10KMH with a larger engine! You should have gained trap speed, not lost any. I'd get the engine looked over, you've lost power with a 454 compared to the 427...