LT4 Hot Cam
Thread Starter
Safety Car
Joined: Nov 2005
Posts: 3,961
Likes: 573
From: Lompoc, CA. Santa Barbara County
LT4 Hot Cam
Anyone running this cam in their C3 besides Jason? What is your experience, 1/4 mile time, gas milaege, and vacuum at idle?
I've decided to do the Hydraulic Roller cam conversion and I was considering the Hot Cam. It has .525/.525 lift with 218/228 degrees duration @.050 and my 1.6 rockers. My current cam is a summit 1105 with 224/234 degrees duration with .496/.520" lift. I get an acceptable 11" vacuum at idle, and I run 13.2 second 1/4mile@ 108mph, and 4.6 0to60 mph. I would like to join the 12 second club. Jason turns 12s with the Hot Cam.
The Comp Cams tech recomends the XM276HR hydraulic roller with 224/230 degrees duration @.050, .537/.544" lift w/1.6, but that was for max power and acceptable vacuum. I would love to run a slightly milder cam to get decent power and gas mileage.
I have a 9to1 CR L-82, with freeflow header/exhaust sysem, airflow research 195cc ported and polished heads, 700R4 with 2000rpm stall, Brad Urban modified Qadrajet on a modified LT1/Z28 manifold, and 3.55 gears.
What do you think?
Bee Jay
I've decided to do the Hydraulic Roller cam conversion and I was considering the Hot Cam. It has .525/.525 lift with 218/228 degrees duration @.050 and my 1.6 rockers. My current cam is a summit 1105 with 224/234 degrees duration with .496/.520" lift. I get an acceptable 11" vacuum at idle, and I run 13.2 second 1/4mile@ 108mph, and 4.6 0to60 mph. I would like to join the 12 second club. Jason turns 12s with the Hot Cam.
The Comp Cams tech recomends the XM276HR hydraulic roller with 224/230 degrees duration @.050, .537/.544" lift w/1.6, but that was for max power and acceptable vacuum. I would love to run a slightly milder cam to get decent power and gas mileage.
I have a 9to1 CR L-82, with freeflow header/exhaust sysem, airflow research 195cc ported and polished heads, 700R4 with 2000rpm stall, Brad Urban modified Qadrajet on a modified LT1/Z28 manifold, and 3.55 gears.
What do you think?
Bee Jay
Racer
Joined: Dec 2004
Posts: 416
Likes: 12
From: Merrick NY
I have this cam kit in my 97 LT1 motor. I was able to drive it for about 4500 mi. in my 97Z until it got hit by an unliscensed driver. I originally got it because it's one of the biggest cams you can run and pass emissions. The cam is slightly lopey depending on how low you set your idle, mileage (w/ a T56 and factory FI) was around 18-20 mpg, vacuum did not seem to suffer at all. I don't have any 1/4 mi times, but it was much better than the stock cam thats for sure.
The motor is going in as-is into the 70 coupe I'm building, but if I could do it again I'd get a comp cams combo, as the GM lt4 springs are suspect, and they have more choices to get the same or more lift and duration, but offer different lobe separations to give you the idle and vacuum you want.
It's been a year since I've driven it, man that sucks...
The motor is going in as-is into the 70 coupe I'm building, but if I could do it again I'd get a comp cams combo, as the GM lt4 springs are suspect, and they have more choices to get the same or more lift and duration, but offer different lobe separations to give you the idle and vacuum you want.
It's been a year since I've driven it, man that sucks...
