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  1. S

    will J heads work on a 318? And many many more questions.

    +1. they will work just fine, a slight loss of bottom end is well worth the gain of top end. IMO. note the comp ratio will most likely drop slightly due to the larger 72cc chamber volume. only the 273 has interference problems with intake valve and cyl. wall. 2.02" and 1.88" valve will clear...
  3. S

    RPM question

    cam and valve springs usually govern the max RPM for an engine or its rod bolts breaking..... i would spin my 318 7200 rpm it stopped making a difference at about 6500 the rest was pretty much a stress test on the internals.
  4. S

    bouncing timing mark

    well looks like the idle quality was tossed out the window with the choice of the 509 cam there is a alot of RPM fluctuating going on at idle due to lope. the dist, oil pump drive and bushing and timing chain all get jerked around when at idle with a large cam. i believe that at idle as long as...
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