Cam Size Help
Thread Starter
Teching In
Joined: Oct 2016
Posts: 4
Likes: 0
From: NNJ
Cam Size Help Hi all,
I'm currently building an lm7 turbo 5.3 motor. I need your help in choosing a proper cam size for my application. The car will be a street warrior and may see the track from time to time.
The supporting mods will be as follows:
LM7 stock crank and pistons
ARP Studs
317 heads with dual springs* and other hardware
Cam*
80lb injectors
PT7475 with a big front mount. Around 10-13psi
60mm wastegate
T56 Tranny
E85 fueling
Two walboro 450 pumps
* Indicates not yet purchased and need advice.
So, my question to you, what cam size and dual springs would work best?
Thank you!
PL_Chevy
I'm currently building an lm7 turbo 5.3 motor. I need your help in choosing a proper cam size for my application. The car will be a street warrior and may see the track from time to time.
The supporting mods will be as follows:
LM7 stock crank and pistons
ARP Studs
317 heads with dual springs* and other hardware
Cam*
80lb injectors
PT7475 with a big front mount. Around 10-13psi
60mm wastegate
T56 Tranny
E85 fueling
Two walboro 450 pumps
* Indicates not yet purchased and need advice.
So, my question to you, what cam size and dual springs would work best?
Thank you!
PL_Chevy
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
10-13 PSI? You don't need dual 450 pumps.
You also don't need to use 317 heads with E85, all you're doing is killing power at that point.
With any stock cathedral head casting, find something below .600 lift and just use a single beehive spring.
You also don't need to use 317 heads with E85, all you're doing is killing power at that point.
With any stock cathedral head casting, find something below .600 lift and just use a single beehive spring.
Thread Starter
Teching In
Joined: Oct 2016
Posts: 4
Likes: 0
From: NNJ
What fueling would you recommend? Two 250 walboro? Thanks again for your suggestions
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
You can run 80s at 18 PSI with enough fuel pressure, no worries there.
If you run the dual 450s, you'll have all of the fuel pressure you need. They top out around ~650whp each on E85. You'll lose flow by cranking the pressure, but you'll still have more than enough for 18 PSI. I would start with a 58-60 PSI base pressure with a boost referenced regulator and go from there.
If you run the dual 450s, you'll have all of the fuel pressure you need. They top out around ~650whp each on E85. You'll lose flow by cranking the pressure, but you'll still have more than enough for 18 PSI. I would start with a 58-60 PSI base pressure with a boost referenced regulator and go from there.
Wow, I am really glad to hear "you" say that about that cam, and those heads. Thats what I have and "lots" of people say I have "too much cam", but so far even NA, I love it. I can't wait to get my boost on it!
FormerVendor
Joined: Aug 2014
Posts: 473
Likes: 1
Yea.. alot of people think my cams are big and will turn huge RPM just from looking at the durations. They dont bother running the actual valve events.
N/A I have been told that cams just a blast. couple guys have posted 5.3/t56 builds where they made over 400 with it.
Its just a great all around cam... everyone thats ran it loves it.. never had 1 single complaint about it.
N/A I have been told that cams just a blast. couple guys have posted 5.3/t56 builds where they made over 400 with it.
Its just a great all around cam... everyone thats ran it loves it.. never had 1 single complaint about it.
