Well, that sounds like the very under driven pulley set up various places on eBay sell. I had them, didn't line up and made cooling and charging worse. I personally thought you needed their 6" set which looks like my March two groove crank pulley, lines up good with my 3 groove water pump pulley that came with the useless underdrive crank pulley. You need to make sure you have a 100 amp alternator to properly charge.Nothing worked. Pulleys they sent me arent lineing up with anything. Cant even tighten up the crank pulley cuz the ID is so tight a sockect cant even fit on the head of the bolt with hitting the side. Wtf is going on with this piece of sh*t. Why cant anything go right? Thought the "403" is considered small block. Clearly theres something different about the 403 compared to other small block/big block motors
GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates.