Check my brain math! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davepl · 04-24-2016, 08:34 PM

I'm replacing a ZZ502 with an LS3 (eRod). It was and will be backed by a TKO-600 five speed with a Hayes clutch.

I've reused the 621 bellhousing, clutch, pressure plate, and throwout bearing. I did this by ordering a GM flywheel (similar to the SACHS unit) that is supposedly 0.400 thicker than a normal LS, which should put the flywheel deck face at the same spot.

Sure enough, when I mocked it all up and measured BBC vs LS, the flywheel face was within 2 hundredths of an inch, probably within my measurement error.

I also checked to make sure I have a clutch fork angle of about 7-10 degrees.

I had no luck trying to do the dead reckoning method where you work out the distance from the flywheel face to the pivot ball.

What are the odds, given I confirmed the flywheel face height and fork angle, that this is set up correctly? Or do I have more work and homework to do?

Thanks,
Dave

solidaxel · 04-25-2016, 12:31 AM

How much travel do you have far end of the fork, mechanical or Hyd.
Is the Bell housing in the same location or did you move things to the rear?

davepl · 04-25-2016, 11:47 AM

Bell housing in same location. Not sure about fork travel, but its the mechanical linkage.

04-24-2016, 08:34 PM	#1
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Check my brain math! I'm replacing a ZZ502 with an LS3 (eRod). It was and will be backed by a TKO-600 five speed with a Hayes clutch. I've reused the 621 bellhousing, clutch, pressure plate, and throwout bearing. I did this by ordering a GM flywheel (similar to the SACHS unit) that is supposedly 0.400 thicker than a normal LS, which should put the flywheel deck face at the same spot. Sure enough, when I mocked it all up and measured BBC vs LS, the flywheel face was within 2 hundredths of an inch, probably within my measurement error. I also checked to make sure I have a clutch fork angle of about 7-10 degrees. I had no luck trying to do the dead reckoning method where you work out the distance from the flywheel face to the pivot ball. What are the odds, given I confirmed the flywheel face height and fork angle, that this is set up correctly? Or do I have more work and homework to do? Thanks, Dave __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

04-25-2016, 12:31 AM	#2
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: Check my brain math! How much travel do you have far end of the fork, mechanical or Hyd. Is the Bell housing in the same location or did you move things to the rear? __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

04-25-2016, 11:47 AM	#3
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: Check my brain math! Bell housing in same location. Not sure about fork travel, but its the mechanical linkage. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

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