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  1. Kevin S

    454 Big Block Chevy Build

    I did this recently. 1979 454 in a longbed 2wd. Plan was a torque motor. One year ago and doing fine. Isky roller 208/218 114LCA with about .500 lift (EFI coming). Torque build. Makes good power off idle, 1600 cam starts noticably helping, 2200 strong and flat torque curve which peaks at...
  2. Kevin S

    454 Big Block MPG

    Might mention the possibility of a fuel leak and all vacuum hoses and gaskets. I have fresh rebuilt 454 SM465 with 3.21 rear end & 66mph@2250, getting 12.21mpg. The rebuild included increased compression to 9-1 with new pistons, changed from peanut port to oval port heads, Isky 112LSA...
  3. Kevin S

    Doug Thorley Tri-Y headers

    I recently put a set on my '79 2wd manual 454 BBC build. Fit real nice. No discoloration and run surprisingly cool with the ceramic coating. Quite thick and I feel top-quality, happy with the choice. THY-303Y- 4:2:1 long-tube headers, primary tube 1-3/4", 14ga, 2.5”, 3/8 flange, ceramic coated...
  4. Kevin S

    Windshield Wiper Motor replacement

    Squarebody Chronicles: Windshield Washer Pump fix Replacing a broken washer pump motor in an old 78-? full-size Chevy/GMC platform? Read on. Project scope: Added a "universal washer motor" to bypass the broken factory washer pump system. (LMC 36-4081) This system comes with a bit of hose and...
  5. Kevin S

    "The Highway Hauler"

    Would enjoy discussing your findings on this. EFI is on my wish list, hoping to get better mileage, easier cold-weather starts, proper leaning at higher altitude, etc. How much of a gain did you record going from carb -> Holley Sniper EFI? City/Highway/Towing under load, etc. General comments...
  6. Kevin S

    "The Highway Hauler"

    =synthetics where you can =high-pressure pizza cutter tires v. monster truck look, just like the factory recommends =no lift kits exposing the underside to unnecessary drag +airdam+skirts. =maybe a vacuum gauge to monitor & educate your right foot Heresy for old-skoolerz that snort milk through...
  7. Kevin S

    "The Highway Hauler"

    My '79 C2500 is moving the same way. 454 manual SM465, with 3.21 rear end so already geared pretty high for highway. At 55mph reasonable RPM's in low 2K, at 85+ it nears 3K which is more than I like for distance cruising when doing the Western parts of USA. Engine rebuild nearing completion...
  8. Kevin S

    GM paper or K&N hi- flow filter, Worth the cost in a stock truck ?

    I use the K&N. My reasons: performance/efficiency - airflow higher/easier less restriction cost/reuse - admittedly smaller with an old truck with normal street use for me recommended to clean and re-oil @50k miles, however I see this truck staying with me forever so springing for the premium...
  9. Kevin S

    Tank replacement for EFI

    Was thinking of getting the Sniper EFI system for the 454 / MT... perhaps a separate post for EFI conversion and your experience?
  10. Kevin S

    73-80 454ci spec questions.

    My `79 GMC C2500 454 wooden longbed with manual SM465 has plenty of torque too... feels like I could dump the clutch in 4th and it would go through a mobile home with no throttle. Don`t wanna try that.. I believe the cam duration is around 192/202, don`t know the lobe separation angle but...
  11. Kevin S

    Engine Choices

    First post, I am a bit interested in this too. My starter is a `79 GMC 3/4-ton long (original wooden bed) 454 manual SM465, with low gears rated towing for 12,000, probably a 4.10 or 4.56 in the rear end (2200rpm@60mph?). barn find... originally ran propane for years, always synthetic oil...
  12. Kevin S

    Longbed with wood flooring

    I have a '79 GMC C2500 with a wood longbed, was told that was the last year they were available.

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