Posted by merlin (IP: 209.20.173.85) on July 20, 1999 at 01:04:29:
In Reply to: If they have 1.94/1.60 valves, they are not stock... posted by T.L. on July 13, 1999 at 19:00:56:
: 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...
: : 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
: 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.
The 351w heads are good street heads ,but only the ealry ones with the 1.84/1.54 valves. 289 heads with bigger valves won't do much good with porting out the runners. The slotted heads acted as the pushrod guides.