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  1. #16
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    hi
    Trik Hq
    What brand of headers ?? Collector size / length ?? Do u use an adapter plate on standard chev port ??. I had alot of issues with the standard 1 3/4 headers I did have,, RE head Plate 1/ centre ports divider very wide 2/All head plate ports were narrow .
    Interference with exhaust flow would have been fairly bad . Its why I started looking at other options .

    Your engine would be interesting with a 1 7/8

    For a street based engine sub 6500 it appears a collector of 3 inch is all thats needed .
    If 17/8 are so compromising many brands in the USA are offering these on even 5 ltr engines but 5.7 to 6.4 ltr is common . But hey its the usa bigger is always better rules .

  2. #17
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    HI
    dam double post

  3. #18
    Do you ever leave? EH179's Avatar
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    Get them 18" collector extensions in there...that seemed to show up gains/losses more than the primary pipe increase did.

  4. #19
    Do you ever leave? TRIKHQ's Avatar
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    Quote Originally Posted by swampy View Post
    hi
    Trik Hq
    What brand of headers ?? Collector size / length ?? Do u use an adapter plate on standard chev port ??. I had alot of issues with the standard 1 3/4 headers I did have,, RE head Plate 1/ centre ports divider very wide 2/All head plate ports were narrow .
    Interference with exhaust flow would have been fairly bad . Its why I started looking at other options .

    Your engine would be interesting with a 1 7/8

    For a street based engine sub 6500 it appears a collector of 3 inch is all thats needed .
    If 17/8 are so compromising many brands in the USA are offering these on even 5 ltr engines but 5.7 to 6.4 ltr is common . But hey its the usa bigger is always better rules .
    HI Swampy,
    Pacemaker 1 & 3/4 , 3 inch collector, 18 inch extensions . no adaptor plate, makes peak power at 7000 rpm, has run 10.52 @ 130.2 mph over the qtr, 3600lbs . With full exhaust, 3" system, X pipe, 2 x resis, 2 x hooker mufflers, tail pipes.

  5. #20
    Do you ever leave? TRIKHQ's Avatar
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    Quote Originally Posted by swampy View Post
    hi
    Trik Hq
    What brand of headers ?? Collector size / length ?? Do u use an adapter plate on standard chev port ??. I had alot of issues with the standard 1 3/4 headers I did have,, RE head Plate 1/ centre ports divider very wide 2/All head plate ports were narrow .
    Interference with exhaust flow would have been fairly bad . Its why I started looking at other options .

    Your engine would be interesting with a 1 7/8

    For a street based engine sub 6500 it appears a collector of 3 inch is all thats needed .
    If 17/8 are so compromising many brands in the USA are offering these on even 5 ltr engines but 5.7 to 6.4 ltr is common . But hey its the usa bigger is always better rules .
    HI Swampy,
    Pacemaker 1 & 3/4 , 3 inch collector, 18 inch extensions on the dyno, . no adaptor plate, makes peak power at 7000 rpm, has run 10.52 @ 130.2 mph over the qtr, 3600lbs . With full exhaust, 3" system, X pipe, 2 x resis, 2 x hooker mufflers, tail pipes.

  6. #21
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    Hi
    Trik
    U make a good advert for 1 3/4. [If I owned your beast 1 7/8 I`d just have to try LOL. ] Absolute proof 3 inch collector is enough even for 640 hp !!

    Proof a 383 tried 1 7/8 with 3.5 collector . The 1 3/4 were slightly better in the midrange [3.o inch collector ]. If the 1 7/8 had a smaller dia. 3.o and longer collector would just beat the smaller set of headers IMO

    This engine size seems to be a cross over 400 --427BBc , HP seemed to slow after about 5500rpm with 1 3/4 . The 1 7/8 gained alot

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