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  1. #1
    Do you ever leave? HPE PETE's Avatar
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    Default street/strip flat tappet 355

    another engine near completion in the shop at the moment is this 355 we are doing for a long time customer of ours

    this engine was previously a std stroke 304 nothing fancy, cast pistons A9L rods, with a set of my 260cfm 1.94 valve VN heads with a crane 288 11:1 comp, TP single plane, 650 QFT, 1 3/4 tri Y's, good ignition etc, was in a VH street car and ran a best of 11.1 @ 121mph with 4.11 and 5k stall, unfortunately that car has been sold so we wont have a direct comparison to the old combo but this engine is going in another VH so providing the set up is similar to the old car producing 10 sec ET's is the goal

    quick run down on the new 355 version, this will aslo be driven on the street and raced with pump fuel only, engine will be going on the dyno in the next couple of weeks

    VR block, sonic tested, grout filled past the bottom of welch plugs, bored and TQ plate honed .040 over with our 4 bolt conversion using CRD steel center 3 main caps with 7/16 outer cap screws, de burred etc
    basic oil mods including blocked #4 lifter gallery feed with cross over behind #1 cam bearing, external oil pickup conversion, modded oil pump and sump with -10 drain backs from rear of cyl heads
    scat 355 9000 series crankshaft
    scat 6" 7/16 bolt I beam rods
    CP bullet pistons
    romac balancer
    VN heads with my latest mid size port design CNC cut then hand finished, ferrea 2.050/1.600 6000 series intake and exhaust valves, crane springs retainers and locks etc, flows around 290cfm, milled for 11.3:1 CR
    TP single plane off the std stroke engine, port matched with plennum mods
    750 cfm pro systems carb
    custom grind solid flat tappet camshaft nitrided, edge orifice lifters
    YT platinum roller rockers.

    some pics of the build so far










  2. #2
    Do you ever leave? HPE PETE's Avatar
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    Default



  3. #3
    Senior Member Deuce.'s Avatar
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    Definitely Subscribing to this one! Might try to copy some stuff onto my spare VR block.
    I'm guessing that there was no clearancing required extra to the factory cast in clearance's?
    Last edited by Deuce.; 31-10-2015 at 06:16 AM.
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    we need to keep this place positive unlike the rest of the internet.

    355" V8 PB = 2.108 60ft, 13.840qtr @ 101mph
    95" V-twin = 91hp/97ft/lbs. Best E/T 12.26 @ 108mph - 2015/16 Competition Series winner at my Local track (DYO)

  4. #4
    Part of the furniture Tim304's Avatar
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    Nice Pete. What size sft you going or is this another squirrel grind lol

  5. #5
    in the shed buildin shit 3554me's Avatar
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    10's will be a walk in the park mate , it's looks another quality build !
    10.44@128.90 on e85

  6. #6
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    Nice build. I like the ft but why no roller either hyd or solid? Cost?

  7. #7
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    Some more Hpe power to hit the track,good job ��

  8. #8
    Do you ever leave? HPE PETE's Avatar
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    Quote Originally Posted by Gasdrx View Post
    Nice build. I like the ft but why no roller either hyd or solid? Cost?
    solid roller would have been great for this combo and would see the most out of the cyl heads but the owner specified a flat tappet to be used for this build,

    doing a HYD roller to suit this application that will see 7000+ rpm and remain stable can get expensive due to the cost of using premium quality lifters and keeping the valve train light, the 372 we did had no probs turning 7200 rpm but it has good quality crane lifters and light weight valve train components all of which cost top dollar so cost would be a major factor doing a hyd roller for this application

    id really only rate the cheaper HYD lifters with smaller wheel and cheaper valving to around 6500 rpm with conventional parts

  9. #9
    Do you ever leave? HPE PETE's Avatar
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    Quote Originally Posted by Tim304 View Post
    Nice Pete. What size sft you going or is this another squirrel grind lol
    hey tim, 259/268 618/610 lift , the cam in this one is pretty close to the -3 headed 355 we are about to dyno so will be good to compare both engines, same size engine, similar head flow, intake is similar, one is iron head one is alloy head, one has symmetrical valve and port layout and one is non symmetrical, same size 4 into 1 headers

  10. #10
    Do you ever leave? HPE PETE's Avatar
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    Quote Originally Posted by Deuce. View Post
    Definitely Subscribing to this one! Might try to copy some stuff onto my spare VR block.
    I'm guessing that there was no clearancing required extra to the factory cast in clearance's?
    only very minor clearancing in a couple of places, you could just about get away with no grinding with these rods

  11. #11
    Part of the furniture Tim304's Avatar
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    Sounds good mate. Be interested to see the power output of these....

  12. #12
    Part of the furniture Justin_'s Avatar
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    Thats a good looking build!!

    whats the theory behind choosing a custom ground cam?

    Noticed the pistons have valve reliefs... How are you getting the comp up to 11.3 with them?

  13. #13
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    basically we can choose the lobes we want to use rather than be limited to whats available with shelf grinds, nothing wrong with a shelf grind but i wanted something specific that suits these heads and the overall combination and other parameters like lift, lobe sep, specific exh lobe etc

    55.5cc chamber and 6.8cc valve relief, chev piston was chosen to suit the chamber volume as these heads were already milled, also the block had been previously milled for zero deck with the std stroke combo so the pistons are now +.020 above the deck, rather than machine the crown on these pistons down further which brings the ring land closer to the top of the piston weakening the ring land we will be using a .060 thick cometic which will still give us a piston to head clearance of .040

  14. #14
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    short just about complete







    just waiting for cometics to arrive then heads and valve train can go on



    then onto this, tomorrows task for the day


  15. #15
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    This is real close to a 355 I'm just finishing up - virtually identical rotator except we're using CP's with no valve reliefs. I'm a fan of the Scat Procomp I beams, nice compact big end on them, fairly light & plenty tough.
    We're just using 2 bolt mains with 1/2" studs.

    We went for a SFT for the same reason - going to need to spin past 7000 & will get street driven quite a lot, going past 7000 means a hyd roller is pretty much out, regular street driving & ability to do quite a few kays between maintenence means a solid roller is out, leaving a SFT as the best option if the budget is not there for $$$$ parts.

    The rest of it is VT heads flowing 28x/19x, 2.055 & 1.625" valves, 11.7:1 comp, harrop intake, QF 850 carb, 264/268 on 108 custom SFT cam sporting .635" lift after lash (.380" intake lobe, 1.72 ratio rockers).
    I'm not on here much any more - don't bother PM'ing me, chances are I won't read it, just call me on 08 8376 9540 if you need to get hold of me or email knight28@optusnet.com.au, phone is better!

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