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Send PMWest Bend, WI - USA
Joined: 3/18/2010
Posts: 46
Vette(s): 1985 silver coupe & 1975 red coupe
I have a 1975 Vette which I just got on the road after much work. I installed a GM 330 HP crate motor and had the TH400 trans rebuilt and beefed up. The car runs great but what worries me is the engine RPM. At 70 MPH the tach shows 3500RPM. The rear end should be a 3.36 gear. Does this engine RPM seem high to you guys? Maybe I should have went with a over drive transmission as was suggested. Please advise.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
What size rear tire do you have?
My '74 has 3:36s, and it tachs right at 3200 rpm at 70.
My '74 has 3:36s, and it tachs right at 3200 rpm at 70.
Joel Adams
C3VR Lifetime Member #56 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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m
Lifetime Member
Send PMEquinunk, PA - USA
Joined: 10/31/2007
Posts: 2570
Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
I have 3:36s as well. I'm Tunin bout 3g at 70 with G-70s
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7
3,200 @ 70 w/ 3:55 gears and 255/60-15 tires
1973 L-82 4 spd
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in Forum: C3 Engines, Driveline and Handling
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