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Thanks Jr - I miss that sound too! The car has been off the road for almost a year, and inching fwd to start tearing into the resto project. Been soo busy with family and business, the Corvette hobby has taken a back seat. Still gathering NOS parts, researching vendors, etc. slowly but surely, albeit at a glacial pace. But listening to that again provides some inspiration! The car wasn't running well when that video was taken - so excited to get the power plant in tip-top shape so it'll spin free, fast and strong...
Thanks Jr - I miss that sound too! The car has been off the road for almost a year, and inching fwd to start tearing into the resto project. Been soo busy with family and business, the Corvette hobby has taken a back seat. Still gathering NOS parts, researching vendors, etc. slowly but surely, albeit at a glacial pace. But listening to that again provides some inspiration! The car wasn't running well when that video was taken - so excited to get the power plant in tip-top shape so it'll spin free, fast and strong...
With the Gears and the cam GOD it will be a BLAST!
Yeah the tune is off, it doesn't rev nearly quickly enough. Or as good as it could. I ran my 70 LT1 Camaro in Pro-Solo for two decades. Yes lightweight flywheel really helps that motor. You should have TI ignition but it will need "curved" Say 15-18 degrees initial but only 36 total, by 3000 rpm. Tune the carb by AFR meter. Put the CR back to 11:1 Good rod bolts in it. Better valve springs like 140 off-road or so. Port the heads, it's worth it. Run the stock LT-1 cam or for a little more the 30-30 cam (69 Z28). It puts a little rumble back in the idle. Keep the solids. Headers please! it needs them. You'll be at 400HP. BTDT I ran 13.5s with a bad launch and 3:55s in a 3550lb street tired Camaro but 106+mph. Stiff autocross setup. More time in the lighter vette. Mine rev'd well to 7400. I only had 4.11s at best and only ran the qtr one time. You could go more cam / heads but then it wouldn't look / sound too original. Roughly 390HP gross, 330 HP net flywheel, 300 rwhp. My car was probably capable of mid/low 12s with 513s, with full drag setup. my friend had one close to that. 300 lb lighter vette should drop another .3-.4 and gain another 3-4mph. Capable of 12 flat if you lean on it hard enough, drag setup. I saw a pure street 70 LT1 Vette rip off a 13 flat once. Yeah almost stock LT-1 could fly pretty well! Build it right so it runs, so it's strong, and then drive it. Waaay to much fun to be a museum piece. Good luck with the build.
I lot of people thought the M-21 in their LT-1 was an M-22 because it was the first year that all Muncie 4 speeds had a drain plug like earlier M-22s. I bought a low mileage 70 LT-1 in 1972 and the seller swore that it had an M-22. Of course it was a M21 with a drain plug. But I later got a copy of the invoice from the dealership, and they had actually charged him the extra $95 for an M-22. Apparently the dealer mistook “close ratio” for “heavy duty” when when they wrote the invoice for the car.
I lot of people thought the M-21 in their LT-1 was an M-22 because it was the first year that all Muncie 4 speeds had a drain plug like earlier M-22s.
Pat,
Very true… Actually, the change occurred about October 1969. Chevrolet changed the case from the 3925660 casting (which only had a fill plug for M-20 and M-21 applications) to the 3925661 casting (which used fill AND drain plugs for all M-20, M-21, and M-22 applications). People with Corvettes built after September 1969 would see the two plugs and assume it was an M-22 (as it was previously) not realizing a change had been made. The side cover for the late 1969 Muncies is unique as well… It has the boss for the TCS used in 1970, but it isn’t drilled and tapped like the 1970 version is.
As for 4.56 rear equipped 1970 Corvettes, I’ve seen about half a dozen real cars so equipped… All ZR-1s.
05-11-2019, 02:43 PM
