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Cam Suggestions

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Old 12-08-2016, 12:09 AM   #1
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Cam Suggestions

I have a 1990 5.7L, automatic with ported edelbrock intake, ported slp runners, edelbrock headers, 24lb injectors, 58mm throttle body, with gmpp fast burn heads, I am looking for the biggest cam I can put in it and still pass the CA SNIFFER TEST, im willing to swap out torque converter and tune just to pass sniffer test...thanks in advance
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Old 12-15-2016, 01:27 AM   #2
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Re: Cam Suggestions

I passed with to comp xfi 268
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Old 12-15-2016, 01:28 AM   #3
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Re: Cam Suggestions

I passed with a comp cams xfi 268 cam
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Old 12-15-2016, 08:25 AM   #4
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Re: Cam Suggestions

Thats the cam I am leaning towards but im not sure on how to increase maximum valve lift on the fast burn heads to accommodate for the xfi268
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Old 12-15-2016, 12:14 PM   #5
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Re: Cam Suggestions

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Originally Posted by eduardosac View Post
Thats the cam I am leaning towards but im not sure on how to increase maximum valve lift on the fast burn heads to accommodate for the xfi268
Isn't the lift only .357/.354 ?
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Old 12-15-2016, 12:23 PM   #6
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Re: Cam Suggestions

Lobe lift. With a 1.5 rocker its .535/.531
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Old 12-15-2016, 03:19 PM   #7
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Re: Cam Suggestions

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Originally Posted by Orr89RocZ View Post
Lobe lift. With a 1.5 rocker its .535/.531
Ah ha, lt4 springs should work but I'm sure the guides need to be cut down.
Or 26918

Last edited by Tuned Performance; 12-15-2016 at 03:22 PM.
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Old 12-15-2016, 03:22 PM   #8
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Re: Cam Suggestions

I would typically run abit more spring with that cam depending on the intake manifold. With tpi it wont go much over 4800-5000 so you can get away with bit less spring pressure. Hsr miniram i would stiffen up as cam will go to 6000 in a good headed 355. Lobes are pretty aggressive
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Old 04-04-2017, 11:35 AM   #9
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Re: Cam Suggestions

No problems here with an xfi268.
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Old 04-13-2017, 01:23 AM   #10
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Re: Cam Suggestions

Passed smog with xr276 hr comp cams and 1.6 roller rockers
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No problems here with an xfi268.

Last edited by valencia1z; 04-18-2017 at 03:08 PM.
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Old 04-24-2017, 11:24 AM   #11
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Re: Cam Suggestions

I agree with the XFI268HR-113 camshaft. Its like an LT4 hot cam but better ramps and lift, plus the 113 LSA makes it easier to tune and pass smog.

The Manley 22407-16 springs will handle .600" lift, too.
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Old 07-07-2017, 10:21 AM   #12
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Re: Cam Suggestions

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Originally Posted by valencia1z View Post
Passed smog with xr276 hr comp cams and 1.6 roller rockers
Valencia1z, that's a fairly large cam with 224-int/230-ex duration at .050". You mind me asking what other mods you did and who did your tune?
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Old 07-07-2017, 02:49 PM   #13
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Re: Cam Suggestions

Whats a good head match for the XFI268? Ca legal of course
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Old 07-11-2017, 11:43 PM   #14
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Re: Cam Suggestions

On mods during that time AFR heads as&m runners big mouth base 58 mm throttle body SLP shorty headers stock 5.7 24 lbs injectors 10 -12 base timing total I'm pretty sure around 32 to 34 total on a 350 low compression during smog set at 6 or 8 air fuel was always good and ran a vigilante 3200 gears 3.23 car was good for mid 12.s on motor on a mickey Thompson drag radials mid 11s spraying

Last edited by valencia1z; 07-11-2017 at 11:59 PM.
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