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  1. #1
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    Hey guys, more of a ford man when it comes to building engines so need a bit of advice on pipe selection for a 355 VN headed combo Im building for a mate. It will have a Crow hydro roller 242/246@50 cam , Edelbrock single plane ,750 quick fuel etc all going into a LX Torana hatch.
    Is there an off the shelf pipe that is going to work well in this combo ?
    Happy to modify a set of pipes if thats what it takes. Or ,alternatively have a set built to suit.
    Any help would be much appreciated.

  2. #2
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    Pacemaker do an off the shelf, but only with 1 5/8" primary. I went Castle because they do the 1 3/4". Pacemaker is the better quality though and 1 5/8" can do 550hp I'm told.

  3. #3
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    hi
    I`m sure its been done with 1 5/8 but at around 450--500hp is 1 3/4 territory. What`s important is port overlap does not occur by to smaller primary tubing . Really good headers have the port tubing slightly enlarged if it is going to overlap slightly.
    If there is any doubt have the header flange plate sent to u to try first.

    primary tube and collector diameter need selection .
    Don`t forget collector spears .
    Ceramic coating is poor by Hurricane

  4. #4
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    hi
    I`m sure its been done with 1 5/8 but at around 450--500hp is 1 3/4 territory. What`s important is port overlap does not occur by to smaller primary tubing . Really good headers have the port tubing slightly enlarged if it is going to overlap slightly.
    If there is any doubt have the header flange plate sent to u to try first.

    primary tube and collector diameter need selection .
    Don`t forget collector spears .
    Ceramic coating is poor by Hurricane ,,make sure headers are blasted b4 coating . Coated dirty headers get pimple rust .

  5. #5
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    Pacemaker headers are the better quality unit off the shelf. Last time I checked they had a few different fitments so I’d flick them an email to see which best suits your application.

    Even with pacies I’d double check that the exhaust ports have no overlap with the header flanges. They are pretty good about returns but I make sure I have a fast turnaround and the headers are not dinged or scratched. Sometimes heads have core shifted and that’s something that you often won’t know until you get your headers. To solve this you can contact them and they used to send a flange template.

    Sometimes it can be very tight getting them in and there’s a specific order to use when assembling the engine into the car. Just a bit frustrating but can be sorted out with patience. A mate with a torrie ended up modifying one bank of his pacies due to fitment issues and had to get them recoated

  6. #6
    in the shed buildin shit 3554me's Avatar
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    I use the 1 5/8 pacemakers and have run 10.28 with mufflers on and a f300 spec cam and power glide
    everyone tells me to use the 1 3/4 so maybe just start there lol
    10.28@131.99 on e85 26x10
    10.34@130.66 on e85 255 radial


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    hi
    yup alot differences of opinion . What about 1 1/2 primaries units ,, available for and fitted to 350 cuin chev .
    Probably approx 20hp in between 1 5/8 to 1 3/4 at 6500rpm
    Larger pipe might cost 20ftlb torque between 3500--4500 but increase TQ and peak at a higher rpm range
    1st priority should be port clearance
    2nd = usage street or strip?? = rpm range ??
    3rd it depends also on end usage but how well your car is setup diff gear /stall / tyre size / cam --head--intake combo .Can your car take advantage of the better breathing???

  8. #8
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    A custom made set would be ideal, but off the shelf have a look at Pacemaker Tri-Y #PH 5260.
    They have 1 5/8" primary with a 2 1/4" tertiary and should fit most transmissions.

    You could cut off the 2 1/4" tertiary/collector and increase to 2 1/2" if desired.

    Forget about 1 1/2" pipes mentioned above, only good for 253's.

  9. #9
    Senior Member BasicQ's Avatar
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    russxr67, all you need to know is what 3554me said. 1-5/8" are helping propel his Commodore down the 1/4 at 132mph. The engine your building doesn't seem that stout so EH179 suggestion should suffice.

    Remember your sucking all the air in through x4 1.375" venturies (750 cfm)and pumping it out with x8 1.625" pipes with 1-5/8" primaries. Yes, the air ingested is heated up quite a bit from combustion but this does not increase its volume, it expands that volume. As we all know with nowhere to accommodate that expansion naturally pressure goes up and with that pressure it exits the 1.6" exhaust valve with little effort. More velocity through primaries to create low pressure behind it with the 1-5/8" at lower (probably broader revs) revs than the 1-3/4". With 1-1/2" you now have a primary pipe smaller than the intake valve so a potential restriction. All of this for WOT. Have the throttle half cracked open and V/E plummets and the volume of gas exiting has even less requirements for 1-3/4" primaries to maintain velocity.
    Last edited by BasicQ; 21-06-2021 at 06:48 PM.

  10. #10
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    Yes, but the question begs to be asked what would 3554me's Commodore run with an 1 3/4 primary?

  11. #11
    Senior Member BasicQ's Avatar
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    Quote Originally Posted by JaseQ314 View Post
    Yes, but the question begs to be asked what would 3554me's Commodore run with an 1 3/4 primary?
    Id like to know that too. Maybe better as it would be a revver and driveline would suit. Might move the pressure wave tuning up the rpm where his engine likes to be. Something only testing can validate. Id love to have a dyno and spend my days testing. This would be one of those things to back to back test - looking at you paul boz



    3554me has displayed what 1-5/8 can support whether best for 3554me combo or not. So for the OP with a lesser hp and lower revver than 3554me, 1-5/8 may be the better choice fitment wise in a Torana knowing theres even greater potential with 1-5/8.



    Sent from my iPad using Tapatalk
    Last edited by BasicQ; 21-06-2021 at 07:08 PM.

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    hi
    1 5/8 or 1 3/4 primaries
    2.5 collector
    Tri Y or 4 into 1 ???

  13. #13
    Senior Member 46Crab's Avatar
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    Quote Originally Posted by EH179 View Post
    A custom made set would be ideal, but off the shelf have a look at Pacemaker Tri-Y #PH 5260.
    They have 1 5/8" primary with a 2 1/4" tertiary and should fit most transmissions.

    You could cut off the 2 1/4" tertiary/collector and increase to 2 1/2" if desired.

    Forget about 1 1/2" pipes mentioned above, only good for 253's.
    I agree with EH179 Ref the off the shelf Pacemakers.
    Id be cutting the 2 1/4 collector off the graft on some 2 1/2.

    For a genuine mild street car that will work well.
    If money is not a big issue and you have a thirst for a power at the top end, you could try for custom pipes and exhaust.

  14. #14
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    I had a look at the specs on that cam and I’m now thinking that a full custom exhaust is a better bet.

    There’s too many undersize proportions given that this engine will likely only start to come on at about 3500rpm. I think the available off the shelf product will leave too much on the table. The Perth folks might have some suggestions as to who does this sort of work over that way and gets good results. It needs expertise to build a system.

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    As I said Castle Headers do 1-3/4" primary with a 2-1/2" collector (CH-56, what I chose) They also do a 4-1 with 1-3/4" primaries and a 3" collector. Plenty of options off the shelf. VPW do stainless ones for cheap too. 1-5/8" prob chinese, but look good.
    The first version of my 355 gained 30 rwhp (406 -436) going from 1-5/8" with a single 3" to 1-3/4" into twin 3" with zero other changes. So don't really know if it was the headers or the twin system damn it!
    Last edited by RedTaxi; 22-06-2021 at 09:54 AM.

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