1986 iron head l98 corvette valve spring question

Discussion in 'Engine: Repairs and Modifications & generally corv' started by Jeremyd0813, Jul 15, 2018.

  1. Jeremyd0813

    Jeremyd0813 Member

    Picked up A crane 114132 cam for my iron head vette (seen multiple good things with with cam on almost stock engine) and seen a post by grumpy saying works really well with 1.6 rockers so I'm changing out my springs and everything to what crane recommends but going to the 1.6rr with the stock heads will there be any issues with lift or anything with the springs being stock height and also stock valve covers? Thanks in advance for any input on this.
     
  2. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

    that crane 114132 cam is a very popular upgrade on many lower hp, nearly stock SBC engines, obviously you'll ,
    want to verify clearances any time you swap valve train components but generally,
    you'll have Zero clearance issues in a stock engine,
    I have too point out all O.E.M. heads on the corvette and all other SBC engines are pathetically restrictive compared to aftermarket heads available
    , while the cam upgrade could and most likely will result in an additional 20-30 horsepower,
    better flowing heads and intakes could boost the result to 45 hp-60hp more than the cam swap, alone might provide, and certainly a low restriction exhaust system and effective scavenging headers help raise efficiency
    [​IMG]
    related info, reading the linked info will help avoid problem

    http://garage.grumpysperformance.com/index.php?threads/checking-piston-to-valve-clearances.399/

    http://garage.grumpysperformance.com/index.php?threads/valve-train-clearances-and-problems.528/

    http://garage.grumpysperformance.co...e-springs-and-setting-up-the-valve-train.181/

    http://garage.grumpysperformance.co...swap-in-1-6-1-ratio-rockers.10671/#post-46039

    http://garage.grumpysperformance.co...to-fit-roller-rockers-and-stud-girdles.12208/

    http://garage.grumpysperformance.co...rocker-ratios-and-the-effects.126/#post-37621

    http://garage.grumpysperformance.co...o-rockers-and-the-pushrods-rub.198/#post-3033

    http://garage.grumpysperformance.co...-rocker-ratios-and-the-effects.126/#post-1193

    http://garage.grumpysperformance.co...rdering-correct-custom-length-pushrods.14241/

    heads
    http://garage.grumpysperformance.com/index.php?threads/porting-can-help.462/page-3#post-78551

    http://garage.grumpysperformance.com/index.php?threads/sellecting-cylinder-heads.796/

    https://www.hotrod.com/articles/ccrp-1209-eight-budget-sbc-head-shootout/

    http://garage.grumpysperformance.com/index.php?threads/ideal-tpi-build.12203/#post-59272
     
    Last edited: Jul 15, 2018
    Jeremyd0813 likes this.
  3. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    You will need to run Valvecover spacers and or remove the PCV Baffle likely for Roller Rockers.

    Roller Rockers will set off the knock sensor .
    Regard ignition timing.
    Must Tune shut the knock sensor off.
    Must purchase Moates OBD1 software.
    I don't consider any TPI engine race.
    Wondeful street engine.
    I would use Grumpy Cam by Crane and with stock Rocker Arms. No issues.
    Drive.
     
  4. Jeremyd0813

    Jeremyd0813 Member

    Thankyou both for your reply, and exhaust is good have a magna flow car back and picked up a set of great condition used tpis headers and y pipe and in the future ( year or so if I decide to do it) was looking at the first fuel injection intake cause like that has a stockish look to it but if go that route would change heads as well....car just sits in garage and daily is a modded lb7 duramax so not looking for tons of power with the car just alittle increase and sound nice. Again thank you both.
     
  5. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

    for the effort and cash spent on that mild cam and a set of 1.6:1 ratio roller rockers ,
    you could reasonably expect a noticeable boost in power , and Most people feel it was worth the cash and time.
    its certainly not going to change the cars engine into a loping & rumbling monster by any stretch,
    but it will increase the engines power when you go too pass or get on the express way on ramp.
    pictures of your car would be nice?
    and certainly I'd like you to post / take several clear pictures of the cam upgrade process, if you go that route
    [​IMG]
    If the valve springs are to be removed with the heads still on the car,

    the last thing you want is too remove a valve spring and have the valve to drop into the cylinder,
    if you use air the crank tends to want to spin the crank to BDC, youll want to verify TDC ,
    and make sure the flywheels temporarily prevented from turning from that the TDC position,
    Ive used both methods both work,you can put 6 ft of rope in the cylinder while its in BDC then turn it to TDC, Ive used both with zero issues,
    If you use the compressor youll want to keep it at 120 psi and constantly feeding pressurized air to keep the valves held in place,
    and theres a small chance the compressor pushes enough moisture to allow water to accumulate in the cylinders,
    so be sure you spin the engine with the starter with the spark plugs removed several times before you re-install plugs.
    if you use the rope, theres a very low chance that the rope will tangle and form a knot that makes removal difficult,
    in either case be sure the pistons locked at tdc,
    before removing the valve springs, on each cylinder.

    http://garage.grumpysperformance.com/index.php?threads/wrong-rocker.13987/#post-71250
     
    Last edited: Jul 16, 2018
    Jeremyd0813 likes this.
  6. Jeremyd0813

    Jeremyd0813 Member

    So ended up doing that cam, comp 1.6rr and rest of valvetrain crane (and just got 3/8 valve cover spacers and fit without hitting), long tube headers, dei coil and module, ported base, runners, upper intake manifold, deleted 9th injector, delete egr and smog and cleaned up the wire harness so connectors not everywhere, pcm of nc did the tune (sending them datalog this week), and will put some pics up...did it late at night when everyone was sleeping so didn't take a ton of pics. Not sure then increase (if u have a ball park let me know, just curious) but its seems alot nicer to drive, especially noticable in midrange compared to how it was. Probably over winter change heads atleast.
     
  7. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

  8. Jeremyd0813

    Jeremyd0813 Member

    I will go through them, thankyou again
     
  9. Jeremyd0813

    Jeremyd0813 Member

    Attached Files:

    Last edited by a moderator: Sep 4, 2018
  10. Jeremyd0813

    Jeremyd0813 Member

    The block off plates for 9th injector and egr were really nice peices

    [​IMG]
    [​IMG]
    [​IMG]
     

    Attached Files:

    Last edited by a moderator: Sep 4, 2018
  11. Jeremyd0813

    Jeremyd0813 Member

    Even with taking the drip tabs off of valve cover still touched alittle so put 3/8 billet spacers on and still retained oem valve covers..
     
  12. Jeremyd0813

    Jeremyd0813 Member

    Said and done with the headers on

    [​IMG]
     

    Attached Files:

    Last edited by a moderator: Sep 4, 2018
  13. Jeremyd0813

    Jeremyd0813 Member

    Now over winter will upgrade the intake and heads, for the intake I'm really set on the first fuel injection setup (I personally like the look of the tpi intake and theres is similar) and probably gonna pair that to afr 190 heads which flow 260 I believe at .500 lift
     
  14. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

    thanks for posting the pictures of the cam swap
    how does it run now?
     
  15. Jeremyd0813

    Jeremyd0813 Member

    Does run better, had pcm of nc do chip first one was really lean and just logged second one tonight and that one rich so getting there but runs good with a 87 aluminum head stage 2 hyper tech chip (was in car when I got it) but very pleased with it overall
     
  16. Jeremyd0813

    Jeremyd0813 Member

    When I logged with the aluminum head hypertech stage2 chip the fueling is pretty close to perfect through the different fuel cells so use that to be safe until the pcmofnc one is finished.

    Kelly has been very helpful and have no issues with them. Went through this with my truck so know it's tough to get it just right without having the vehicle there.
     
  17. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    Damn Jeremy, you did it. I'm impressed. To me, this pic

    [​IMG]

    looks like 10 pounds of (you know) in a 5 pound bag. Congratulations.
     
  18. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

    the CASTING #642 cross fire heads and even most fuelie heads, and all the TPI heads, are compared to today's better designed cylinder heads... well pathetically restricted,
    I would strongly suggest you select an aluminum cylinder head (with at least a 190cc and 200 cc port is better in most cases,that flows a MINIMUM of 250 cfm at .500 lift)
    TRICKFLOW
    http://www.trickflow.com/egnsearch.asp? ... 4294867081
    http://www.trickflow.com/customerservice
    1-330-630-1555 • 1-888-841-6556

    BRODIX
    http://www.brodix.com/heads/heads.html
    479.394.1075

    DART
    http://www.dartheads.com/products/cylinder-heads
    Dart Machinery; 248/362-1188; DartHeads.com


    AIR FLOW RESEARCH
    http://www.airflowresearch.com/
    toll free: 877-892-8844
    tel: 661-257-8124

    Patriot Performance
    Patriot Performance; 888/462-8276; Patriot-Performance.com


    RHS
    http://www.racingheadservice.com/rhs/cylinder-headshtml
    Toll Free: 877-776-4323
    Local: 901-259-1134

    EDELBROCK
    http://www.edelbrock.com/automotive_new ... main.shtml
    Edelbrock; 310/781-2222; Edelbrock.com

    BMP (world products)
    http://www.theengineshop.com/products/cylinder-heads
    Tel: 631-737-0372
    Fax: 631-737-0467

    BUTLER PERFORMANCE
    http://www.butlerperformance.com/products/cylinder_heads/cylinder_head_labor.html
    866-762-7527

    BLUE PRINT ENGINES
    http://www.blueprintengines.com/ind...sb-chevy-aluminum-cylinder-heads-cnc-machined
    1800-483-4263

    PRO-FILER
    https://www.profilerperformance.com/
    937‐846‐1333

    YOU CAN BUILD A tpi BASED ENGINE ON THE ORIGINAL LOW COMPRESSION 350 SHORT BLOCK BUT THERES POTENTIALLY A VERY GOOD BOOST IN POWER AND TORQUE IF YOU INCREASE THE DISPLACEMENT TO 383-406 AND INCREASE THE COMPRESSION TO THE 9.5:1-10.2:1 RANGE.

    the intake selected should be port matched and if possible ported to maximize flow
    the FIRST TUNED PORT intake provides exceptional results
    - FIRST TPI Intake.(good choice)
    [​IMG]

    [​IMG]
    [​IMG]
    intake comes with a new throttle body


    if matched to a cam and cylinder heads and a low restriction set of headers and exhaust, that allows it to breath.
    the crane 119661 roller cam works rather well, on a brisk street performance build (especially with a wet nitrous TPI set up) even more power is available with the crower 00471 roller cam or crane 119651 roller cam

    all three performance hydraulic roller cams will require a 3000 rpm-3200 rpm stall converter and are best matched to a 3.73:1 REAR GEAR RATIO


    http://garage.grumpysperformance.com/index.php?threads/ideal-tpi-build.12203/#post-76070

    http://garage.grumpysperformance.co...-stock-tpi-engine-components.1509/#post-74581

    http://garage.grumpysperformance.co...rger-intake-runners-l98-tpi.13785/#post-72541

    http://garage.grumpysperformance.co...lay-switch-locations-and-info.728/#post-66935

    http://garage.grumpysperformance.co...intake-for-cross-fires.2796/page-7#post-56659

    http://garage.grumpysperformance.co...8mm-throttle-body-on-your-tpi.290/#post-54181

    http://garage.grumpysperformance.co...ps-on-building-a-tpi-383-c4.10434/#post-51507

    http://garage.grumpysperformance.com/index.php?threads/can-you-get-there-with-tpi.10494/#post-44299

    http://garage.grumpysperformance.com/index.php?threads/tpi-flow-info.10382/#post-43474

    http://garage.grumpysperformance.co...m-dyno-results-and-other-info.433/#post-37683

    http://garage.grumpysperformance.co...y-current-corvettes-383-combo.430/#post-32660
     
    Last edited: Sep 5, 2018
  19. Jeremyd0813

    Jeremyd0813 Member

    Honestly compared to the vehicles I work on in a daily basis theres alot more room in the engine bay of that vette.
     
  20. Indycars

    Indycars Administrator Staff Member

    Hum???? What say you ???
     

Share This Page