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Author Topic:   289/302 rods (non-Boss)
V8 Thumper

Posts: 4681
From: Phoenix, Arizona
Registered: Dec 2001

posted 01-10-2002 07:58 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
Would drilling 289/302 rod bolt holes to take 3/8" hardware (replacing the 5/16" bolts) weaken the rod?

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Posts: 2831
From: Spencer, WV
Registered: Jan 2001

posted 01-10-2002 10:29 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Years ago some people would drill out the rods for small journal chevy 11/32" bolts, which are between 5/16" and 3/8" in size... and there was a lot of debate on whether that did more harm than good. If you look at the rod, you'll see there isn't much room beyond the stock size.

Using larger bolts is NOT needed anymore. Back then, bolts were not near the quality they are now. A set of ARP wavelock bolts will handle all the stress the rod itself is capable of generating. I use 5/16" ARP pro series bolts in my 289 rods, and haven't had any problems. They have seen 7k rpm more times than I can count. The standard wavelock bolts are excellent, and half the price of the pro-series. They should be all that is needed for all but the harshest use.

Good Luck!

Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3

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Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 01-10-2002 11:42 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Mike is correct. We used to install 11/32 chebbie bolts or 5/16 SPS bolts in std 289 rods all the time. It seemed that the rods kept their shape a bit better with the 11/32 bolts, but at the expense of weakening them. They would occasionally crack. We even used to install 13/32 390 HP bolts in 289 HIPO or Boss 302 rods. The "bigger is better" syndrome was the norm in the 70's.
Todays ARP wave loc or B&B HP bolts are so good that the likelyhood of them failing is almost non existant.

Alex Denysenko
Co-Administrator and Moderator
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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