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  1. stroker402

    273 commando Build

    No I did not cc them
  2. stroker402

    273 commando Build

    update :::::::::::::::::: drv side 920 head valves and seats lapped.
  3. stroker402

    273 commando Build

    Yes, those are oem 318 head gaskets I will use .. and they are composite. they came to me in a nice package . double wrapped .
  4. stroker402

    273 commando Build

    got the valves and seats lapped on one head..
  5. stroker402

    273 commando Build

    just mocking things up on the 273 . laying head gasket on. here is what a oem 318 composite gasket roughly 3.9__ to 4.00 bore fire ring looks like on a 273 head. also I finished the other head port and polished ..
  6. stroker402

    273 Commando Rebuild Or Not?

    here is what a 318 composite gasket roughly 3.9__ to 4.00 bore fire ring looks like on a 273 head.
  7. stroker402

    273 commando Build

    update on porting : finished one head ... it's not a full port job, but overall it does appear to be much better than stock.. it is opened up some and cleaned up. all rough extrusions removed. very happy with results !
  8. stroker402

    273 commando Build

    update got one head ported except for around the seat and guide.. not sure what shape around the guide boss I should have . what do you guys think ? I have watched tons of videos and everyone has a different opinion how to shape that area.
  9. stroker402

    273 commando Build

    that's the plan !
  10. stroker402

    273 commando Build

    ok I see ! the smaller diameter is the pilot hole for the actual larger pin size.
  11. stroker402

    273 commando Build

    dowels are in the block ... I will measure the hole depth to the ledge in the head and then measure the pin height sticking out of block. also I will lay the head on the block and see how it looks and feels . this is a different engine block now so I have the check the dowel pins
  12. stroker402

    273 commando Build

    look at this picture ............. I took all the valves out of one of the 920 heads today and just out of curiosity I looked inside the dowel pin hole on the head and noticed the hole is NOT drilled all the way to the bottom of hole the same diameter. there is a 1/8" ledge that is narrower...
  13. stroker402

    273 commando Build

    you are correct !
  14. stroker402

    273 commando Build

    273's did not come with a windage tray ...
  15. stroker402

    273 commando Build

    the key was not sheared or the keyway not boogered up.. that was All fine..... it was the harmonic balancer that went bad and spun . this 273 engine revved violently fast .
  16. stroker402

    273 commando Build

    moving on to the 920 heads ... gasket matching
  17. stroker402

    273 commando Build

    If you guys read my past posts I mentioned every time i matted it to the floor is when the gaskets blew.. probally because the balancer slipped another 4 -5 degrees. hence detonation. as you can see the balancer moved almost 2 inches from tdc and then you add in another initial 18*.. I...
  18. stroker402

    273 commando Build

    I finished the short block and new paint today .. heads are next . port and polish.
  19. stroker402

    273 commando Build

    I'm going to use a nos pair of 318 composite head gaskets 3.91 bore
  20. stroker402

    273 commando Build

    here is a pic of how far the balancer spun ,, not even close to tdc.
  21. stroker402

    273 commando Build

    another warm day in Wisconsin ... ready for paint next.
  22. stroker402

    273 commando Build

    UPDATE UPDATE !! FOUND THE SMOKING GUN ! well I finally found out why the 273 was popping head gaskets .. check the pics out and see . top balancer is the one that spun !
  23. stroker402

    273 commando Build

    318willrun ... i watched your videos several times about porting heads . nice ! that's the plan !
  24. stroker402

    273 commando Build

    Yes this 273 block is coming along nicely ....but..... My attention is going to be put on porting and polishing the 920 heads.. I want some horsepower to be unleashed from those 920 heads. this past engine was a beast without any real porting done . so we will see how much more hp I can...
  25. stroker402

    273 commando Build

    update on 273 build . got a 50* day here today in Wisconsin .. got the oil pump and windage tray installed. moving right along ! Google Photos
  26. stroker402

    273 or NOT 273?

    Hey, you guys are all missing the point here . the OP wants a built 273 that puts out max hp and can run the 12's or lower et's .. all you have to do is lighten up the car.. case closed! do you really think the gentleman that runs 10's with his 273 abody mopar hasn't lightened that car...
  27. stroker402

    273 commando Build

    I don't think so... winter will be here tomorrow, in the 30* all week.. at least the major part is done, the rest is a piece of cake .
  28. stroker402

    273 commando Build

    worked on the 273 today and got the pistons installed.
  29. stroker402

    273 commando Build

    65 DART in Park video .
  30. stroker402

    273 commando Build

    my ragtop dart 402 magnum stroker ran 11.50's on motor
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