The 1947 - Present Chevrolet & GMC Truck Message Board Network - Boss 338 - 20x8.5 on 1.25 Rotors

The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)

- The 1967 - 1972 Chevrolet & GMC Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=3)

- - Boss 338 - 20x8.5 on 1.25 Rotors - No Mods (https://67-72chevytrucks.com/vboard/showthread.php?t=578069)

fredm98

04-29-2013 10:19 PM

Boss 338 - 20x8.5 on 1.25 Rotors - No Mods

5 Attachment(s)

I got a set of these 20x8.5 Boss 338 with the full expectations of machining down the rotor. But to my wonderful surprise, they bolted right on, no spacers, no grinding, no turning down, perfect fit. These are the style with the O-ring cap. The rotors are off a 1976 1/2 ton. 255-40-20 front and 285-40-20 rear on 20x8.5 wheels all the way around.

fredm98

04-29-2013 10:21 PM

Re: Boss 338 - 20x8.5 on 1.25 Rotors - No Mods

5 Attachment(s)

more pics

bugmasta

04-29-2013 10:22 PM

Re: Boss 338 - 20x8.5 on 1.25 Rotors - No Mods

Sweet! My wheels will be here tomorrow so I am hoping for the same luck. I am fully prepared to grind but if I don't have to, AWESOME!

fingers crossed........
Posted via Mobile Device

fastnotch89

04-30-2013 05:22 PM

Re: Boss 338 - 20x8.5 on 1.25 Rotors - No Mods

The 20's with stock rotors and spindles you will need a spacer, on the 22's like i have, all i had to do is knock the dush cover in just alittle.

bugmasta

04-30-2013 10:58 PM

Re: Boss 338 - 20x8.5 on 1.25 Rotors - No Mods

Wheels came and I had to grind down the rotors. No big deal. I have factory 72 rotors on the front so not surprised. Tires show up tomorrow so new shoes will be rolling tomorrow afternoon.
Posted via Mobile Device

ulakovic22

05-01-2013 10:23 AM

Re: Boss 338 - 20x8.5 on 1.25 Rotors - No Mods

Good looking truck, what are the specs on the drop?

Codez67Chevy

05-01-2013 12:12 PM

Re: Boss 338 - 20x8.5 on 1.25 Rotors - No Mods

Nice Mitutoyo's lol and wheels.
Posted via Mobile Device

fredm98

05-02-2013 07:59 PM

Re: Boss 338 - 20x8.5 on 1.25 Rotors - No Mods

Quote:

Originally Posted by ulakovic22 (Post 6045274)

Good looking truck, what are the specs on the drop?

Well I'd estimate it a 4-6 maybe 4.5-6.5? I cut a half turn from the springs and have 2-1/2 drop spindles. The rear springs are junkyard find out of a late model full size chevy car. How do you calculate the drop? Maybe measure from the centerline of the wheel to the top of the wheel arch? What are those measurements from the factory?

fredm98

05-02-2013 08:01 PM

Re: Boss 338 - 20x8.5 on 1.25 Rotors - No Mods

Quote:

Originally Posted by bugmasta (Post 6044718)

bummer you had to grind. Must be the 73-79 rotors are thinner. Post up some pics once you get her all rollin'

bugmasta

05-03-2013 08:56 AM

Re: Boss 338 - 20x8.5 on 1.25 Rotors - No Mods

Quote:

Originally Posted by fredm98 (Post 6048509)

bummer you had to grind. Must be the 73-79 rotors are thinner. Post up some pics once you get her all rollin'

up and rollin! had to add 1.25 spacers to the rear as well even with a 72 rearend.

http://i1182.photobucket.com/albums/...ps2810b7d2.jpg

All times are GMT -4. The time now is 04:35 PM.