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  1. S

    Best Plugs to Run with Shorty Headers?

    Thanks for the update. NGK are top notch!
  2. S

    Dual Plane MPFI Manifold

    Like this here...
  3. S

    Dual Plane MPFI Manifold

    I'll be cheering you on! I set a performer on my engine during the cam swap to see if there was any interference from the AC compressor etc. I couldn't find any show stoppers telling me no. If I was doing a 383 I would definitely go for it. I believe you had a Mercruiser version before. Jeff
  4. S

    Best Plugs to Run with Shorty Headers?

    It is certainly possible. The spark could be shrouded a bit from being recessed. Could be the lack of EGR needs some supplemental tuning as well. I haven't run into that before. Two changes at once is not an ideal situation to diagnose. I would definitely take care of the spark plug reach issue...
  5. S

    Best Plugs to Run with Shorty Headers?

    I don't believe those are the shorty version. They make regular length plugs too.
  6. S

    Best Plugs to Run with Shorty Headers?

    Acell PN P526S in my post above. Unfortunately only available in double platinum for double the price!!
  7. S

    Best Plugs to Run with Shorty Headers?

    The ones you listed are only 3/4 reach. If you still have Vortec heads, .700 reach is correct. https://www.holley.com/products/ignition/spark_plugs/double_platinum/parts/P526S Jeff
  8. S

    Cam Setup For L31 350 Vortec

    Would these suffer the same failure mode as the LS rockers when used with higher spring rates? I also noticed this style is used in a 2005 vintage 3800. I believe the whole assembly was supplied by Torrington.
  9. S

    97 5.7 vortec

    I was looking at this during my cam upgrade. They appear to be drilled for both patterns. Not sure about the port alignment. Summit sells the same head under their own brand.
  10. S

    Summit 8800 cam upgrade

    I was pretty happy about it. Less delay and money spent. Yep self aligning long slot. The pushrods are hardened but not needed for this application although they may be out there, non hardened one piece units haven't popped out at me. I did check the clearance on the distributor against the...
  11. S

    Summit 8800 cam upgrade

    And again, good tip! I certainly wouldn't have known or even thought about it.
  12. S

    Summit 8800 cam upgrade

    Thanks for the insight on the timing. I had a look at the table but none of the modifiers. Just never got that far. A revisit after the 411 is installed will be certain.
  13. S

    Summit 8800 cam upgrade

    Hi there first post for me. I just wanted to share my experience with this cam in my '97 Suburban. Before I started the project I did a lot of research to figure out which specs or range of specs would fit my needs. L31Express's info sure has been helpful with all of his previous work. I had...

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