LS7 build for 95 Caprice
06-11-2010 | 12:49 PM
#1
LS7 build for 95 Caprice Hey everyone - I'm new to the gen III/IV world, as well as this forum. I've fooled with pretty much gen 1 and 2 stuff in my vehicles in the past.
I have a few questions related to the engine internals I thought some of you would have more experience answering than me.
I'm in the process of building an LS7 headed, 427 iron block (LQ9 bored and stroked, eagle forged crank) that will be going into my 95 Caprice/Impala daily driver. The heads are low mile stock LS7, and I'm already replacing the exhaust valves to stainless and the rocker arms to upgraded units (not sure what kind of rocker arms yet). I'm using a 6l90 as the trans. Other than that, I'm still figuring out the details.
My goals for the car are:
1) Keep this thing comfortable as a daily driver.
2) Make good power, keeping a pretty flat torque curve, without totally killing mpg (which should not be hard considering the 290,000mi LT1 in there now only gets 21 on the highway).
My main questions are:
1) Any cam suggestions for a car this heavy (about 4300 lbs)?
2) Suggestions for CR? I am thinking sticking to around 11:1?
3) Anyone have good experiences with piston coatings or friction reducers? Are they worth the money? Will they increase engine longevity? Any specific suggestions?
4) What kind of rockers should I upgrade to? Looking for the best priced option that would be reliable in a street driven, occasionally raced car.
Thanks in advance everyone. I appreciate any and all help and suggestions.
I have a few questions related to the engine internals I thought some of you would have more experience answering than me.
I'm in the process of building an LS7 headed, 427 iron block (LQ9 bored and stroked, eagle forged crank) that will be going into my 95 Caprice/Impala daily driver. The heads are low mile stock LS7, and I'm already replacing the exhaust valves to stainless and the rocker arms to upgraded units (not sure what kind of rocker arms yet). I'm using a 6l90 as the trans. Other than that, I'm still figuring out the details.
My goals for the car are:
1) Keep this thing comfortable as a daily driver.
2) Make good power, keeping a pretty flat torque curve, without totally killing mpg (which should not be hard considering the 290,000mi LT1 in there now only gets 21 on the highway).
My main questions are:
1) Any cam suggestions for a car this heavy (about 4300 lbs)?
2) Suggestions for CR? I am thinking sticking to around 11:1?
3) Anyone have good experiences with piston coatings or friction reducers? Are they worth the money? Will they increase engine longevity? Any specific suggestions?
4) What kind of rockers should I upgrade to? Looking for the best priced option that would be reliable in a street driven, occasionally raced car.
Thanks in advance everyone. I appreciate any and all help and suggestions.
06-11-2010 | 03:24 PM
#3
I'd have someone on here spec you a cam for that combo. Talk to PartickG. I just got mine spec'd by him, and will be ordering it next month. You're gonna want something with a strong torque curve in the low/mid range to get that baby moving (which I'm sure you know). Sounds like it's going to be a nice strong build.
Remember to get your block sonically checked to make sure you cam bore it out that far. If not, may have to go with a short deck LSX Block.
Also, remember the size differences between the 6L80/90E and the 4L60E. The 6L80/90E is more consistent towards the rear of the case with minimal taper, so you may be in for some floorpan alterations.
With this combo, what do you plan on using to control it? You can't use the Gen IV PCM to control the AC because its controlled through the BCM, unless you run it seperate from the PCM. Or you could go for the Lingenfelter 24x conversion box and run an older 0411 or blue/green pcm if you have a 58x reluctor wheel.
Remember to get your block sonically checked to make sure you cam bore it out that far. If not, may have to go with a short deck LSX Block.
Also, remember the size differences between the 6L80/90E and the 4L60E. The 6L80/90E is more consistent towards the rear of the case with minimal taper, so you may be in for some floorpan alterations.
With this combo, what do you plan on using to control it? You can't use the Gen IV PCM to control the AC because its controlled through the BCM, unless you run it seperate from the PCM. Or you could go for the Lingenfelter 24x conversion box and run an older 0411 or blue/green pcm if you have a 58x reluctor wheel.
