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Head and Cam Package

Old Aug 31, 2003 | 06:10 PM
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Default Head and Cam Package

OK, I have made the decsion to move forward with the hard and cam package for my 5.3.

I have researched heads and I am going with West Coast Cyl. Heads (on the left side of your screen ----->)

What I would like to know is, what cam you all are running and what results you have seen. Is there anyone running a cam with a FI set up? I would be most interested in those results. Is there a CARB approved cam that someone is using?

I have ordered LS1 edit and EFI live so that part is handled.


Thanks in advance for your input.
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Old Aug 31, 2003 | 07:58 PM
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Default Re: Head and Cam Package



I have researched heads and I am going with West Coast Cyl. Heads (on the left side of your screen ----->)


Your other left------------->>>>>>>>>>>>>>>>>>>>

Check out some of the combo's in the FI section. I will be running a 212/216 522/529 114 when I'm done. The guy that I got that cam from was running it with a whipple and predator tunning at 13.2's.
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Old Aug 31, 2003 | 07:59 PM
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Default Re: Head and Cam Package

BTW, it was an reg cab sb 5.3 Chevy.
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Old Aug 31, 2003 | 08:19 PM
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Default Re: Head and Cam Package




[/quote]

Your other left------------->>>>>>>>>>>>>>>>>>>>



[/quote]


Yeah yeah yeah.....I was thinking right.....but went left...
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Old Aug 31, 2003 | 09:24 PM
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Default Re: Head and Cam Package

we knew what you meant...

Before I went FI, I ordered CraneCam 208/216 .500/.500 113lsa (we measured base circles and the exact lsa is 112.6) That is the same cam I have in right now with the Whipple. The lsa is too low for boost though. I think I may be leaking boost out the exhaust valve because of the low lsa at high rpms. The durations are good though -maybe go two degrees higher on both.

Here is a post I thought I was right on the money for FI cam choices. The Whipple max rpm also applies to the Radix "heaton roots" super charger. I am not sure at what rpm is max spin for the Radix though.

I was thinking about it, and I would probably bring the duration down a little even from my suggested 210/218. Here is why: on the Whipple you cannot spin it faster than 14000rpms..trust me you don't need to anyway (multiply crank pulley size by RPM and divide by the size of the blower pulley) RPM is the key component in that calculation. Depending on how much boost you want to achieve, the smaller the blower pulley the less rpms you will want to turn the engine.

Here are my Whipple numbers you can play around with and see how it works. You will see though that you can spin the motor fairly high with a smaller pulley and still not max out the Whipple rpms. Crank pulley=8" Whipple pulley=4.25" RPMs I set it to shift at=5600. Every 0.25" drop in Whipple pulley size is about a two psi increase. And a 4.25" pulley single belt Whipple gives about 6psi.
So, (8x5600)/4.25 = 10,541 Whipple rpms. But lets see if you wanted ten pounds shifting at 6200 (Where you could expect to peak in power if you have a large cam i.e. anything over 212 int. duration) (10x6200)/3.75=16,533 Whipple rpm.

I know you would probably only run a max of about 8lbs with water injection, but who knows. I just wanted to let you know how to incorporate the Whipple into the cam selection equation.
NOTE also that you want to shift right after your max power begins to peak. This keeps you in your power band. As well, spinning heavy internal engine parts to 6200rpms is not necessary with Boost. Tunning a monster cam is not fun either, although they do sound really cool.

This is getting long, but back to my original cam estimate: 210/218 .530 .530 115lsa +2deg. advance
*Lower durations, to keep max power lower in the rpm range. Advaning a cam will bring the power on at a lower rpm. So that cam would still make torque like a 208/216 duration.
*Lift=free hp up to a point of dual valvesprings which sound like a diesel when they pull the valve back into the aluminum head.
*Higher Lobe seperation, lessen valve overlap or "scavenging" at higher rpms. You don't want to leak boost. Also higher lsa will give nicer idle too. Look at turbo Lingenfelter cams, something like 117-119lsa (i wouldn't go that high though) 115 should be great.
Happy choosing Greg. And remember, cams can be changed. It is just a minor headache..oh yeah and $300 every time you do it
Here is the thread where the post came from.
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Old Aug 31, 2003 | 09:28 PM
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Default Re: Head and Cam Package

Oh yeah, match your cam with your heads. I guess see if they already have flow numbers for the heads you want.
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