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| | | Forums66 Topics128,021 Posts1,055,349 Members48,420 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#18199 09/15/2003 10:08 PM | Joined: Sep 2003 Posts: 10 New Guy | | New Guy Joined: Sep 2003 Posts: 10 | Hi Folks,
Can anyone enlighten me about 47-60's GMC six flywheels? I have heard that they came in four and six bolt configurations. Can the fours and sixes be interchanged between CIDs and years?
Thanks,
Quinn | | |
#18200 09/18/2003 12:32 PM | Joined: Jan 2000 Posts: 206 Member | | Member Joined: Jan 2000 Posts: 206 | 228, early 248/270 used 4 bolt cranks and flywheels with 4-bolt pattern. All changed to 6-bolt around 1955. All 302 were 6-bolt. Don't try to re-drill a 4-bolt to a 6-bolt pattern, It removes too much from a critical area. | | |
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