4.8 ls6 top end hp
#61
Sounds awesome. Get the heads milled down and it will run even better. See about advancing that cam for more low end with that 3.08 gear OD is going to suck below 75mph, (that is likely the incorrect spec on cam as well) but it will be ok if thrown together.
Remember 4.8L really just want RPM to make power so a 3.73-4.56 rear gear would make it a "combo" ie it would be really good at any speed
Remember 4.8L really just want RPM to make power so a 3.73-4.56 rear gear would make it a "combo" ie it would be really good at any speed
1998 - 2000 Fbody
202/210 int/exh @ 0.05" duration
0.496" / 0.496" int/exh lift
116 LSA
#62
TECH Fanatic
198/209 119.5 lsa possibly with -2.5 degrees ground in for an estimated installed intake centerline of 122 degrees
It's designed for a 346" engine with well more than 10:1 compression
#63
I've got both early and later cams on my shelf, if I had a degree wheel I would measure but I think by the internet average it's really a
198/209 119.5 lsa possibly with -2.5 degrees ground in for an estimated installed intake centerline of 122 degrees
It's designed for a 346" engine with well more than 10:1 compression
198/209 119.5 lsa possibly with -2.5 degrees ground in for an estimated installed intake centerline of 122 degrees
It's designed for a 346" engine with well more than 10:1 compression
What you guys think the estimated hp/tq would be with the 4.8/ 706 heads worked and milled to yield at least 10.0-10:1, btr or cam motion truck cam something like stage 2 - 202/206 525 -550 lift, new valve springs, ls6 intake, stock 4.8 converter&4l60e, 1 3/4 long tubes , injector size?, 3:08 gear,
#64
TECH Fanatic
Yes your right. I looked somewhere else. Well, I was trying to keep the cost down but looks like I will have to get a 4 8 cam motion or btr cam. I'm starting to understand this cam stuff a bit more.
What you guys think the estimated hp/tq would be with the 4.8/ 706 heads worked and milled to yield at least 10.0-10:1, btr or cam motion truck cam something like stage 2 - 202/206 525 -550 lift, new valve springs, ls6 intake, stock 4.8 converter&4l60e, 1 3/4 long tubes , injector size?, 3:08 gear,
What you guys think the estimated hp/tq would be with the 4.8/ 706 heads worked and milled to yield at least 10.0-10:1, btr or cam motion truck cam something like stage 2 - 202/206 525 -550 lift, new valve springs, ls6 intake, stock 4.8 converter&4l60e, 1 3/4 long tubes , injector size?, 3:08 gear,
#65
Sounds like a fun driver. Just get it going first with the stock LS1 cam though, keep it quiet while you sort out the chassis trust me because after you drive it a while you will end up wanting a stall converter and a bigger cam than a 202/206. Don't forget polyurethane motor mounts and a stock soft rubber trans mount will probably be best
#67
01-'02........12561721.............196/207...................0.467/0.479
According to the chart If this is the case it won't make any sense swapping
I thought he had the 98-2000 cam with 496-500 lift
The 4.8/5.3 cam is 190/191 int/exh @ 0.05" duration
0.466" / 0.457" int/exh lift
114 LSA
According to the chart If this is the case it won't make any sense swapping
I thought he had the 98-2000 cam with 496-500 lift
The 4.8/5.3 cam is 190/191 int/exh @ 0.05" duration
0.466" / 0.457" int/exh lift
114 LSA
Last edited by 86CAMARO400HP; 07-03-2019 at 02:01 PM.
#69
TECH Fanatic
#71
TECH Fanatic
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89ThirdGenCamaro3310 (07-04-2019)
#72
I went through the same debate when I put my 4.8 in my camaro. I tried all the stock stuff before I finally threw a little comp 212/218 shelf grind in mine. The 1721 is going to best the 9065 in the 4.8 at any RPM below 5000 and will be quicker from a dig with your 3.08 gear. Sure the 9065 has a little more lift but it also closes the intake valve significantly later (search valve events) and will give less dynamic compression, which of all the Ls engines the little 4.8 is most sensitive in that department. My 212/218 115+0 comp gives 5psi more cranking compression than the 1721 on my 4.8 and pulls off idle just as well. The 9065 was slightly weaker off idle than the 1721 and thought it might make 5-10 more hp up top, it just isn't worth it with a 3.08 gear. Now put a 3.73+ in there and you can get more agressive
Ls1 stock torque converter
Lifters and guides
1721 cam
862 heads
Valve springs
Etc...
I do plan on eventually upgrading the rear end, suspension, stall, and transmission. I will be basically getting the car ready for a iron ls1 build but driving it around on weekends and stuff.
Just curious, what are your full cam specs?
#75
TECH Fanatic
#77
TECH Fanatic
It's an aftermarket grind, it's not a stock cam designed for a larger engine being used in a smaller one. Just read back through the thread again I've explained all this already. Happy 4th
#78
Ok. I just re-read the whole thread. If I'm not an idiot I believe you stated that you had a 2:73 rear end. If so, it sounds like its working for you all things considered
I just want to do this cam thing one time. The supporting mods will come after. (I.E. rear end, stall,suspension,etc..)
I also understand its probably impossible to do this because its probably best to install it for the 3.08 gear and stock converter I currently have.
#79
TECH Fanatic
Happy 4th. Just finished hosting bbq and crab boil!
Ok. I just re-read the whole thread. If I'm not an idiot I believe you stated that you had a 2:73 rear end. If so, it sounds like its working for you all things considered
I just want to do this cam thing one time. The supporting mods will come after. (I.E. rear end, stall,suspension,etc..)
I also understand its probably impossible to do this because its probably best to install it for the 3.08 gear and stock converter I currently have.
Ok. I just re-read the whole thread. If I'm not an idiot I believe you stated that you had a 2:73 rear end. If so, it sounds like its working for you all things considered
I just want to do this cam thing one time. The supporting mods will come after. (I.E. rear end, stall,suspension,etc..)
I also understand its probably impossible to do this because its probably best to install it for the 3.08 gear and stock converter I currently have.