Cam Motion 5.3 "drop in" cam results, +41rwhp/22rwtq
07-19-2017, 10:38 PM
#101
TECH Senior Member
Gotta say, once GM put EFI and good ignition on the big block, it got way more efficient and powerful. Actually turned it into a decent engine, for what it was.
07-20-2017, 02:01 PM
#102
It could have been tuned to use 87 octane but I did not because even stock the truck picked up noticeable seat of the pants gains with more timing (especially in low RPM areas).
The truck was tuned for 89 octane before the cam and I retuned for the cam but kept it tuned for 89 octane so it would be a fair comparison before/after.
I could probably have squeezed a few more HP out of it on 91 octane but I wanted to keep the tune conservative enough I can run on 87 in a pinch because some small towns in Oklahoma and Arkansas only have 87.
I will say that the timing maps are not optimized. I used an Fbody high octane timing table then adjusted it down until it was happy and played around with it in the area of peak torque. The low octane table is either stock truck or close to it.
That said the truck seems to feel better when I put 91 octane fuel in it anyway, especially in summer. This could be a placebo effect though.
The truck was tuned for 89 octane before the cam and I retuned for the cam but kept it tuned for 89 octane so it would be a fair comparison before/after.
I could probably have squeezed a few more HP out of it on 91 octane but I wanted to keep the tune conservative enough I can run on 87 in a pinch because some small towns in Oklahoma and Arkansas only have 87.
I will say that the timing maps are not optimized. I used an Fbody high octane timing table then adjusted it down until it was happy and played around with it in the area of peak torque. The low octane table is either stock truck or close to it.
That said the truck seems to feel better when I put 91 octane fuel in it anyway, especially in summer. This could be a placebo effect though.
07-20-2017, 03:09 PM
#103
TECH Senior Member
07-20-2017, 03:23 PM
#105
TECH Senior Member
OK, thank you for responding so quickly! Sounds like you have it dialed in pretty well! You've mentioned before how well the truck runs with the "new" cam. I call it a winner!
12-12-2017, 03:09 PM
#106
Teching In
The L33 and early non VVT Gen IV motors had the 193-193 cams with .482-.482 lift and the VVT cams seem to add duration and lift on the exhaust side.
I was wondering what 5% more duration and lift would do when I came across this post.
08-17-2018, 12:11 PM
#107
Teching In
1 more Bump Just ordered this cam for my 2000 Silverado Ext Cab 5.3 LM7. Doing 243 head swap(shaved .25) new valves 2.02/1.57 with Pac beehive springs. Currently getting new 4l60e installed with stock converter already have CAI stock intake , Magnaflow muffler with 3" tail pipe stock cats and stock manifolds. Just want a little more pep from my daily driver. Will have this tuned also.
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swathdiver (05-04-2022)
10-18-2022, 03:49 PM
#108
Teching In
Hey guys forgot to udate on set up,I had it tuned a it pulls great all around!!!! Could'nt ask for any better I have about 45,000 miles so far running great, I also did a few videos to!!!
Tuner told me shift points were at 5700.And shortblock has over 300,000 miles!!!
Tuner told me shift points were at 5700.And shortblock has over 300,000 miles!!!
Last edited by Gmoney5.3; 10-18-2022 at 04:10 PM.
The following 2 users liked this post by Gmoney5.3:
LCBE (10-28-2022), swathdiver (10-19-2022)
The following 2 users liked this post by Gmoney5.3:
HioSSilver (10-23-2022), swathdiver (10-19-2022)
