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Thread: LS3 cam swap and vacuum
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11-09-2020 #1
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LS3 cam swap and vacuum
Thinking about a cam swap in my 1970 Nova. Car currently has a LS3 “hot cam”, TKO600, 3.91s (440whp/400wtq). I drive the car everywhere any chance I get. While the car is definitely fun it’s fairly tame. Looking for something a little more aggressive along the lines of a stage 3 Brian Tooley, Gwatney, TSP, etc..... The tuner will custom spec the cam.
Anyone have a similar set up or can comment on vacuum with a fairly aggressive cam swap? Car has factory power discs up front/rear drums. Any Potential vacuum issues with the new cam....? I’d prefer not to Hydro-Boost.
thanks!
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11-09-2020 #2
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What's the specs on the cam?
11-09-2020 #3
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233/253 .646/.637 112 +4 or 229/243.9 .630/.615. 113+4
11-09-2020 #4
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I have a friend with a LS 3 and BTR Stage 2 and associated springs and push rods. Car idles around 55kPa. Very nice drivability and it rips. If you are debating between two cams, go with the smaller one.
Andrew1970 GTO Version 3.0
1967 Cougar build
GM High-Tech Performance feature
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Dr. EFI
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Remote Holley EFI tuning.
Please get in touch if I can be of service.
"You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her
11-09-2020 #5
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Thanks Andrew!! Good to know. Are they running power brakes with no issues?
11-09-2020 #6
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He has manual brakes, but at his vacuum level, power brakes should not be an issue.
Originally Posted by NovaSF
1970 GTO Version 3.0
1967 Cougar build
GM High-Tech Performance feature
My YouTube Channel Please Subscribe!
Instagram @projectgattago
Dr. EFI
I deliver what EFI promises.
Remote Holley EFI tuning.
Please get in touch if I can be of service.
"You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her
11-10-2020 #7
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Had issues with a relatively mild BTR cam that had lousy vacuum. A little reading of the reviews on Summit revealed it was a widespread problem with that cam. Do your homework because some BTR cams do produce low vacuum....
Don1969 Camaro - LSA 6L90E AME sub/IRS
1957 Buick Estate Wagon
1959 El Camino - Ironworks frame
1956 Cameo - full C5 suspension/drivetrain
1959 Apache Fleetside
11-13-2020 #8
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I use my car the same as you, daily driver during nice days, powertour, etc. I run 229/244 .629"/615" 112 LSA tsp cam with their ported heads in my ls3 and it drives great. I made 500 whp through a tremec magnum. I still run my vacuum brakes as well.
11-16-2020 #9
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Thanks!! We shall see. Gonna do H/C swap. If it’s an issue could always go electric vac pump too. We’ll see
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