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  1. 4

    2009 GM 4.3L vortech stalls over 3000 RPMS

    OK guys I need some good advice here- just installed a new 4.3L GM Vortech w/ Holley 4BBL.600 CFM. seems to run fine under 3000 rpms. timing is good all adjustmets to carb seem good - runs smooth---but when you do over 3000 RPMs acts like someone hit the kill switch-no sputter or nothin. no...
  2. 4

    anti syphon valve

    Where is this valve exactly- is it on the actual fuel tanks? I cann not find one on my 30 gal inboard tank. What is it actual purpose? Thanks
  3. 4

    Thermostat housing water ports.

    I had a Mercuriser 4.3 V-6 175 H.P. 2 BBL 1993 engine that blew and I am replacing this engine with a 4.3 V-6 GM Vortech 2009 225 H.P. 4BBL V-6. everything has aligned up perfectly with this change out except this: My question is since this new engine is under 2 yr. warrentee , I do not wnat...
  4. 4

    wiring delco EST to orgional thunderbolt 4 wiring harness

    Hello, I am totally new to this forum so please bear with me. As you can see by my ID I have had real BAD luck with 2 used 4.3 engines( long story). Just bought a new in box 2009 4.3 vortech 4Bl. 225 H.P. My question is my orgional 4.3 has the mercuriser distrubitor- the new 4.3 has the Delco...
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