Join Date: Nov 2006
Location: North Channel Lake Huron
Re: 1970 Camaro SS L78 4spd
Yes the Tach in my 70Z has the Yellow line starting at approx 5700rpm and Red Lines at 6500rpm but it has an 8000rpm Scale not the 7000rpm Scale like the Tach Chuch is showing.
Now you got me thinking. When I bought the Car in the mid 70's it had an L78 out of what I thought possibly came from a 66 Vette as it had the grooved Rear Main Cam Journal and Canaster Type Oil Filter. The car also had BBC Front Coils. Perhaps the previous Owner replaced the LT1 Tach with a 70 L78 Tach and my other Tach is the Original 350 LT1 Tach. The car is originally a 70 z28 with 03A 28.10 on the Protecto-Plate designating it a March 1st Week 1970 z28 with White Stripes. The M21 has the small out put and smaller Drive Shaft conducive to the LT1 z28 Drive Train. Optioned as follows: Special Instrumentation with 130mph Speedo, Console, Hide-Away Wipers, M21 4 Speed, Posi-4.10 Gears, Soft Ray F3 Dark Tint Glass and White Strips. I of 3161 z28's built with these Options for that 1/2 year of production. The COPO chin and rear spoiler came with the car but can not say they were original options as the build date of the car appears to be too early.
It would really make me Quiver to think the L78 was the original Engine and the 28.10 could possible read 78.10 - if that designates a L78. I'm 100% positive the 2 is not a 7 and the Z28 Emblems are original - That motor was a 396 + .030" - LOL.
Why would there be a 7000 and 8000rpm Scale difference between models of Tachs with the same 5700 to 6500rpm Yellow Zone if not the 8000rpm scale was intended for the 360Hp LT1 and the 7000rpm scale intended for the L78 - makes you Wonder.
I believe both the z28 and L78 having the Special Instrumentation Option shared the 5700 to 6500rpm Yellow Line and you could order either a 7000rpm or 8000rpm Scale Tach from GM - but don't quote me.
How much did you say these 70 L78 Tachs are Worth? I know the Dip Stick I use in my 460 Mechanical Roller originally from that mid Sixties L78 and sold for $450 on eBay once - now that's SICK; because, I would never build a motor around a DipStick - LOL
Last edited by Z15CAM; Dec 25th, 07 at 03:28 AM.