Posted by Mark (IP: 192.62.107.213) on July 14, 1999 at 10:24:52:
In Reply to: Because... posted by T.L. on July 14, 1999 at 09:50:44:
Ya pretty much have me sold on my 289 heads. The only other option that I have is new Aluminum heads with 2.02's and 160's. Thanks for the info.
: ...Pre-'77 351W heads have 1.84/1.54 valves in them...the older 302s have 1.78/1.45 valves...but you must use a taller piston with the 351 heads or else the compression ratio will be low...
: : : If your cam has less than .500-inch lift, you do not need screw-in studs...if it's more than .500, then you do...The Performer manifold would fit the 351 heads but WHY?!!!...They have smaller valves and lower compression due to the larger combustion chambers...
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: : : : Okay...I have stock 65 289 heads with 194/160 valves. Slotted pushrod holes. The only advantage I can see to screw in studs is that they won't pull out. Does anyone really see any other reason that I should concider this option? What about roller rockers????
: : : : I would go with 351 heads, but would my 289 Performer intake fit on them? And isn't there a water jacket that needs to be cut in the 351 heads? Haven't really put a finger on the whole 351 head conversion. I
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: : : know that it was mentioned below, but some of the more unanswered questions are remaining unanswered there.
: : : : Stock push rods. Would I need valve guides with the slotted heads?
: : : : I know that the 351 heads have larger runners than the 289, but is it really worth the effort on a street machine. Not planning on racing. Need drivability. Have an extra set of 289 heads.
: : Figured it might be a good idea. Why does everyone else seem to want 351 heads???