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408cid cam

This is a discussion on 408cid cam within the Internal Engine forums, part of the LSx Technical Help Section category; I'm thinking about building an 408 cid iron short-block, with ported PRC L92 cylinder heads. I want this motor to ...

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    Devil Dog therel82's Avatar
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    408cid cam

    I'm thinking about building an 408 cid iron short-block, with ported PRC L92 cylinder heads. I want this motor to be my daily driver, but I want to get the most out of the motor and still drive it to work everyday. So my question is what cam should I get for this engine. I know that if I was putting a cam in my stock cid LS1 then 224/224 to 228/228 would be good to go. But I was told that the sze of the engine pays a factor in the size of the cam that's needed, and I don't know too many people who has a 408 in their car. So if anybody reads this and has some good advice please feel free to tell me. Thank You

    Black 1999 Trans Am
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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by therel82 View Post
    I'm thinking about building an 408 cid iron short-block, with ported PRC L92 cylinder heads. I want this motor to be my daily driver, but I want to get the most out of the motor and still drive it to work everyday. So my question is what cam should I get for this engine. I know that if I was putting a cam in my stock cid LS1 then 224/224 to 228/228 would be good to go. But I was told that the sze of the engine pays a factor in the size of the cam that's needed, and I don't know too many people who has a 408 in their car. So if anybody reads this and has some good advice please feel free to tell me. Thank You

    Black 1999 Trans Am
    333rwhp/345rwtq
    Funny you ask this I just called Texas Speed Performance two days ago and had this same question. I am going the same route with engine and heads, When I called Texas Speed I talked with a guy named Matt and I orginally wanted to go with the Magic Stick Four camshaft. Matt at Texas Speed, told me that with L92 heads depending on who you buy them from that the Magic Stick 3 camshaft would be a better choice for the 408 and the L92 Heads. Because of the double springs on the Patriot L92 Heads I bought which the double valve springs bottom out at .650 and the Magic Stick 4 camshaft lifts to .649 and would be to extreme for the heads.And with the magic stick three it would fit nicley into my package.
    Here is there information if you want to call them:
    Texas Speed
    CONTACT US
    Address:
    Texas Speed & Performance, LTD.
    329 East HWY 62/82
    Wolfforth, TX 79382
    806-866-0734
    Hours:
    M-F 9:30am-6:00pm CT.

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    Slow'er'Ass Mr. Luos's Avatar
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    240/242 619/613 113

    Streetable, and a mean powerband in a 408.
    It all depends on what you want out of it. Track? Gears? M6? A4?

    I have a 248/254 629/622 113 in my 402. But it sits in the garage most of the time. Drives great though when I do have it out. Cam loves my 4.11 gears with the M6.

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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    240/242 619/613 113

    Streetable, and a mean powerband in a 408.
    It all depends on what you want out of it. Track? Gears? M6? A4?

    I have a 248/254 629/622 113 in my 402. But it sits in the garage most of the time. Drives great though when I do have it out. Cam loves my 4.11 gears with the M6.
    How are you doing Mr. Lous, what camshaft are you running. I would assume the TSP Texas Gaint? what valve spring hieght do you have with those heads? Cause I believe you told me you have the Patriot Stage 3 heads also.

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by 99Ls1fever View Post
    what camshaft are you running. I would assume the TSP Texas Gaint? what valve spring hieght do you have with those heads? Cause I believe you told me you have the Patriot Stage 3 heads also.

    Right all around.
    Patriot dual gold springs. Will probably be upgrading those to Manleys in about a year or so when I up the cam a little. If I decide to go that route.

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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by Mr. Luos View Post

    Right all around.
    Patriot dual gold springs. Will probably be upgrading those to Manleys in about a year or so when I up the cam a little. If I decide to go that route.
    is the valve lift on the Patriot Double gold springs.650 ? Just woundering if the double gold's are the spring them come with or an upgrade spring?

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    Slow'er'Ass Mr. Luos's Avatar
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    They are the springs that came on the heads.
    They are good to .650"
    I don't see much reason to go over .630" or so on a hydraulic roller cam anyways. If I go with a bigger cam, the lift will stay about where it is. Up the duration and drop the LSA a little.

    If you go solid roller then go as big as you want.

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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    They are the springs that came on the heads.
    They are good to .650"
    I don't see much reason to go over .630" or so on a hydraulic roller cam anyways. If I go with a bigger cam, the lift will stay about where it is. Up the duration and drop the LSA a little.

    If you go solid roller then go as big as you want.
    Nice man, What intake system are you running on your 402? Fast? LS6?
    Thanks again for all the info man, I hope to see you down at Bandimere this summer again, so you can open the cut-outs and wake us up again at the starting line

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    Slow'er'Ass Mr. Luos's Avatar
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    It is an unported FAST 90/90.
    For now. Should get a port on it soon. Probably not for 2008 though. Too much going on outside the garage.

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    Quote Originally Posted by Mr. Luos View Post
    It is an unported FAST 90/90.
    For now. Should get a port on it soon. Probably not for 2008 though. Too much going on outside the garage.
    Nice man, Well have a great rest of your day. thanks again...

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    Quote Originally Posted by Mr. Luos View Post
    It is an unported FAST 90/90.
    For now. Should get a port on it soon. Probably not for 2008 though. Too much going on outside the garage.
    I just remember another question I had for you. What kind of roller rockers are you running? Or what do you perfer?

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    Slow'er'Ass Mr. Luos's Avatar
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    I am running stockers. Eventually I will have them rebuilt at Harland Sharp.

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    I Like It Stroked 99Ls1fever's Avatar
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    How often do you daliy drive your vehicle? And how does it daliy drive when you take it?

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    Slow'er'Ass Mr. Luos's Avatar
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    Me?
    It gets 4,000 miles a year or so. I took it to work (15-16 miles each way) about once a week in the summer.

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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    Me?
    It gets 4,000 miles a year or so. I took it to work (15-16 miles each way) about once a week in the summer.
    Yea sorry not to be more specific, How does it drive when you are out in town in traffic and on the interstate? Does it get hot or not like to be driven in either or highway or local driving? Just am curious cause I ordered a 408 from TSP and I drive my car two to three days a week to Longmont about 45 miles away. And am very curious to see what I should expect or just not do.

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    Slow'er'Ass Mr. Luos's Avatar
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    Never gotten too hot or anything. Really low RPM's buck a little, but a little more work on the tune should take care of that.
    I took it on 200 mile LSx cruises last summer. Did fine.

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    Mr. Luos-
    Nice, How many hours of dyno tunning did you need when you put your new motor in? Just so I can know what to expect money wise.

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    2-3 hours on the dyno and 2 hours on the street. Still needs a little more time on the lower RPM's. But I am waiting to change a couple minor things before getting with my tuner again.

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    Thanks Man, I truely always appreciate your help.

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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    2-3 hours on the dyno and 2 hours on the street. Still needs a little more time on the lower RPM's. But I am waiting to change a couple minor things before getting with my tuner again.
    What compression ratio are you? and can you run 91 octane gas on your engine?

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