Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
IF, tapping was possible, it should be the CRANK itself. I would not want a heli-coil. To much of a liability for me. Lots of broken parts and pieces of fiberglass scattered around would not be a pretty sight. Just my .02
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
The bolt is a necessity on a 350, fer sher. The older small blocks(283s & early, small journal 327s) did NOT have that bolt, but they also did not have the harmonics that the 350 has, and the balancers were smaller...and fit tighter on the crank. Also, most of the older engines without the crank threaded for a bolt didn't have all of the accessories running off the front of the engine, such as P/S, A/C, AIR pumps, and all that kinda crap. If the crank has threads for a bolt, then it should have the bolt. I don't know about using a Heli-Coil in the crank...I don't think I've ever heard of anyone doing it, but it may be possible. I wouldn't have an issue doing it, nor would I worry about it coming apart any more that I do a "normal" threaded crank. I think if I was gonna do it, I would want the crank out, and have a machine shop install it, so I would know for sure the threads were straight in the crank, and not off a wee bit....which they would be if I drilled it in the car! Adams' Apple2011-02-16 21:00:34
____________________________________ Joel Adams C3VR Lifetime Member #56 My Link
Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion
Thanks thought it would be that way, I was asking because my 55 chev truck with 283 did not have the bolt, did not know when and why the bolt was added. Thought it would make good conversation. somewhere in the history one probably came off and hence the bolt was added
I think that bolt is in there fer good. It's just too hard and even if it wasn't it's virtually impossible to get the drill straight and on center. Think I'll start a new thread about engine options. Must be a sign......
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: email@example.com, 112 LSA, Eagle Steel Crank.
Vette(s): 1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top
Hold the phone superman! I know a machinist that makes a jig that guides a drill bit dead center and saves the thread..I will try and get a hold of him so he can make one for you! Unless you really want to replace the motor because of one bolt?
Corvette is a registered trademark of the General Motors Corporation(GM) &
Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise
noted) and does not claim or imply that Chevrolet or
GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated
with, sponsored or supported by GM. Copyright/trademark/sales mark
infringements are not intended, or implied and are in fact used to support
GM, Chevrolet and Corvette.
Official C3 Vette Registry content is Copyright 2001-2018, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS
Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982