Correct in later years smog and PS pumps and other things used those holes. I have never seen a 350 without them.As far as I know. all 350's had the four engine mount holes drilled nd tapped...I did come across a '66. 327 that the passenger's side was not though
That is correct, and that is one of the reasons why I am a big fan of the SB400. A stock GM 400 block can easily be opened up to 420 without compromising the block. Lots of power in a package that is literally a drop-in, bolt-in engine and EVERYTHING for a trifive is a pure bolt-on. It's just TOO EASY without the challenges that come with a BB.BBC is a monster of an engine when fitted under the hood of a Trifive
I was always under the impression that the large harmonic balancer on the 350 engine might be an interference with the original V8 mounts on a trifive. Has anyone had that problem?ALLLLLLLLLLLLLLLLLLLLLLLLLLLL first generation Chevy small block engines are a pure, 100% direct bolt-in fit in a 55-57 Chevy using the factory front mount brackets and hardware. This includes 265-283-327-350-SB400, and all the various versions inbetween.
As mentioned, SOME blocks did not have all 4 threaded holes----------------------------TOO EASY TO DRILL AND TAP them, using the mount bracket as a template.
Last, DO NOT unnecessarily waste time and money making any mistakes. If you have questions, come here first for CORRECT answers.
daves, WelcomeThanks guys
Aka 100% American Freedom!Big Block Chevy (Mark IV) engine aka the 'Rat' motor.
Historical Review of the Big-Block Chevrolet - The Complete History of Big-Block Chevrolet Engines - Covers the best techniques for rebuilding the 366-, 396-, 402-, 427-, and 454-ci big-block engines.www.chevydiy.com
I've actually got Big Block Boat Mounts., I'll get pics after the storm passes this week.daves, Welcome
If I recall, the BBC will fit into a TRI-FIVE using the BBC front mounts. Same configuration as a SBC only a wider stance. This lines up with the 6CYL. mounting holes in the frame. It moves the BBC motor 2-1/2"-3" forward. Note ADOR's picture (post) about the balancer. The hole in the frame is for a 6CYL mount. It's been about 50 years since I've done this.