Recent content by Hogg

  1. H

    5.7L Vortec Catalytic Converter Question

    4.3/5.0 L35/L30 had single cat like TBI 4.3/5.0/5.7, but Vortec 5.7/7.4 had dual cats. The LD and HD 5.7 L31 trucks also had different pipe sizes off the manifolds 1-7/8" vs. 2-3/4 for the over 8600pound GVRW trucks. peace Hog
  2. H

    5.7 Vortec cold tap/knock HELP!

    I had 1/2 a dizzy gear worn almost to breakage, teh gears were knifedged badly, very sharp. Common issue, my engine had 58,000km when it required a new dist gear. It'll be in your hands, easy to look at. You'll never be able to get your distributor base installed in the same exact orientation...
  3. H

    7.4 Vortec k2500 Exhaust Manifold/ Header Install

    3 heating and cooling cycles will loosen anything. IF you can get the heat where you need it. You are attempting to breakup the threads via dissimilar expansion rates. Heating the cylinder head by running first could be detrimental, rather than heating the stud leaving the head cool. Always...
  4. H

    96 Vortec fuel pressure

    Pressures on the Central Sequential Fuei Injection(CSFI) is 60-66psi, pump running. This is the base fuel pressure after which the vacuum referenced FPR pulls down fuel pressure when manifold vacuum is high, like when idling. Basically a VRFPR keeps the pressure differential across the injector...
  5. H

    Ac isn’t cold at idle

    Underdrive pulleys can make the issue of poor stoplight A/C performance worse than OEM. The OEM GMT-400'like trucks in addition to the mechanical fan also come equipped for an "Aux. electric fan as well. Control for the AUX. fan is in the L29 calibration. Even bumping the idle rpm a hundred...
  6. H

    stalled when trying to restart starts cranking normal then acts as if timing way advanced

    What happens if you remove the air intake and drizzle fuel into the throttlebody while cranking? I once used this technique to back a truck with a bad pump into the shop. If the truck fires, you've got some fueling issue somewhere. If this is a 96+ L31 Vortec 350 the fuel pressure will be...
  7. H

    Stainless Shortys for 1998 K1500

    The main issue with the OEM manifold to catalytic pipes is its diameter and the nasty crimp style bends. Now your 305 L30 will have the TBI 305/350 Y-pipe and single cat. Upgrading to dual cats with better headpipes would work nicely. Here are the 1/2 ton L31 and 3/4 ton L31 headpipes side by...
  8. H

    4.3??? Would like to know more about it.

    I had a 1992 regcab shorty TBI 350 C1500, 3.08 open rear dif, full lo9ad Silverado. My girl had a 1997 200hp L35 V6 reg cab shorty 4l60e 3.08 rear gears open dif. We would go to the drags and whjile my LO5 350 V8 would always rip her V6 out of the hole, that L35's top rpm power and lighter...
  9. H

    1998 K1500...5.0 wiring vs 5.7 wiring?

    The 4,3 and 5.0 have 3 precat O2 sensors, while the 5.7 and 454 have 2 precat and 2 postcat O2 sensors. A Bank1 and Bank 2 precat then a Bank 3 precat sensor which reads BOTH Banks at once, then the single aftercat efficiency sensor. There are some differences between the 1/2 ton 350 and 3/4 ton...
  10. H

    Vortec to Carb swap

    These controllers are expensive. You could always go manual valvebody and use a vac-mod setup to control line pressure. peace Hog
  11. H

    Jet programmer for 96-00 l31

    Its basically Tunercats OBD2 except that there isn't unlimited tuning, you have to pay $100 for each VIN license. There is little if any support, so as TC2 its geared more towards experienced PCM recalibrators. If you cant get a copy of TC2, Jet does work it uses JCL.files IIRC. peace Hog
  12. H

    Hooker Competition Headers

    Here are some pics of the 1/2 ton 1 7/8 crimp down headpipes next to some 3" 3/4 ton L31350 pipes. I have the Hooker Comp Series 2462 1hkr headeres with 1 5/8" x 2 1/2" headers. The 2806 1hkr with 1 3/4" x 3" collector Supoer COmpetition series use equal lenth primaries, but are twice the...
  13. H

    Vortec Tuning

    You canty use the Tech 2 to tune them, but you can use teh TECH2 for boidirectional contyrol of teh trans, TCC aBS etc. You cant actually make changes to a calibration with Tech 2, but you can use Tech 2 to load a calibration into the PCM. peace Hog
  14. H

    GMT400 History

    I'm pretty sure you couldnt get a 4.10 gear in a GMT400 with the 10 bolt. You may have been able to get a F44 14 bolt 4.10 ratio like the 1991-93 454SS, but with 6 lug axles. peace Hog
  15. H

    305 = 454 swap

    The 7.4 will bolt right up to your 60e, the bellhousing pattern is the same, just like any other GM engine. You will need to use the flexplate that will fit your 60e's TC. peace Hog
See more

Latest posts

Staff online

Members online

... and 7 more.
Total: 1,597 (members: 57, guests: 1,540)

Forum statistics

Threads
64,246
Messages
1,389,698
Members
51,232
Latest member
Jmf07

Share this page

Top