Is my cam too small?
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 68
Likes: 0
From: Norman Park, GA
Is my cam too small? 6.0 swap in 03 silverado, prc 2.5 5.3 heads, Holley hi ram intake, long tube headers, comp cam 227/235 .614/.621, built 4l60 with yank 3600 stall. Truck laid down 358 rwhp and 325 ft lbs torque. At drag strip truck has managed a best of 13.08 at 101 and 8.34 at 84. All with 1.98 60’. Truck hooks very good on drag radials and doesn’t appear to be spinning. Best i can tell it’s hooking. Ordered new torquer v2 cam from Texas speed which is 232/234 .600/.600. Will new cam possibly pick up any more power. Truck now is putting down numbers and times like a cam only 5.3. Any help is appreciated. Done compression test and all cylinders were around 140 psi. None stuck up very high or low.
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 68
Likes: 0
From: Norman Park, GA
The guy doing the tune is very reputable around here with ls motors. It appears the tune is pretty good too. It’s seems I’ve never had luck with comp cam so hopefully matching Texas speed heads and cam may be a bump?
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 68
Likes: 0
From: Norman Park, GA
6400 is where my shift points are set up. Looking at dyno sheet power seemed to start falling off around 6550?
Last edited by 88bluchevy; May 14, 2018 at 09:06 PM. Reason: Need more info
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Verdad Gallardo I agree with Darth. That intake wants rpm, and compression is going to help everywhere. Your original camshaft is similar to the new ASA hot cam, and most guys are seeing 420-430 to the tires with that cam, and a good tune. I’m not so sure going to a smaller camshaft is going to make you faster with that particular combo.
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 68
Likes: 0
From: Norman Park, GA
Yeah i was thinking compression numbers should be around 170-185? Supposedly engine is 100k mile motor but when installing cam and all, the cam bearings and all appeared to be in great condition.
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 68
Likes: 0
From: Norman Park, GA
The exhaust is a single 3” axle dump. But I’ve seen single 3” exhaust make more than i am. The torquer v2 is smaller on the lift side but it’s picking up 5 degrees on the intake and losing 1 on the exhaust.
another thing to think about Is what track and the elevation/DA may be throwing off your times and mph if you're above at like 4000'.
edit-I dunno how well that current cam is but the new torquey cam V2 looks similar to my old voodoo cam in my previous firebird built and it ran great even on stock 9.4:1 compression with 317 heads and it trapped above 115mphon a 3200 stall. however I raced it at cecil which is 500' above sea level and I think the DA when I ran it was somewhere around 800-900' that night.
edit2-how much does your truck weigh?
edit-I dunno how well that current cam is but the new torquey cam V2 looks similar to my old voodoo cam in my previous firebird built and it ran great even on stock 9.4:1 compression with 317 heads and it trapped above 115mphon a 3200 stall. however I raced it at cecil which is 500' above sea level and I think the DA when I ran it was somewhere around 800-900' that night.
edit2-how much does your truck weigh?
140 psi cranking is pretty low. I'd be working on bringing that up. That's about what a 9:1 motor does, been a long time since I've hooked up to a 9:1 but iirc that's about where they are. But if all numbers are equal that's usually a good indicator that everything is sealing. With your 58cc heads I'd be looking for about 200 psi but this is all subjective because the cam comes into play and affects DCR
I wonder if you could possibly have the cam a tooth off or if the cam itself might be a hair off.
Did you happen to do a compression test with the stock cam?
I wonder if you could possibly have the cam a tooth off or if the cam itself might be a hair off.
Did you happen to do a compression test with the stock cam?
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 68
Likes: 0
From: Norman Park, GA
never done compression test with stock cam. Truck originally had a 5.3 and i pulled it and swapped in the 6.0. For some strange reason i just keep thinking it’s the cam. It could be a bad grind or it may not jive with the combo i have and that’s why I’m hoping that the torquer v2 will work well with the heads. Either that or the engine is worn and I’ll just spray it until it finally gives and start building a stroker for it.
never done compression test with stock cam. Truck originally had a 5.3 and i pulled it and swapped in the 6.0. For some strange reason i just keep thinking it’s the cam. It could be a bad grind or it may not jive with the combo i have and that’s why I’m hoping that the torquer v2 will work well with the heads. Either that or the engine is worn and I’ll just spray it until it finally gives and start building a stroker for it.
I'm real curious to see how it goes with the new cam and what the compression numbers end up at.
What size tire?
Also, shift at 6800. See if it picks up. I shift at 7100 with a 227 intake lobe. But I have more head/compression/intake/header/exhaust/exhaust duration. And more stall...
Also, shift at 6800. See if it picks up. I shift at 7100 with a 227 intake lobe. But I have more head/compression/intake/header/exhaust/exhaust duration. And more stall...