Lapping piston rings

Larry Hill · 01-18-2016, 05:31 PM

The NHRA approved rod list for the Pontiac 350, 389, 400,421,428, 455, it looks like all the OEM rods were the same size. 13 rods are listed on the approved list with only two rods as super stock only. Of the remaining 11 rods, nine are listed as the OEM size. Crower makes two, Oliver has three, Eagle has one, Childs and Albert has one, and Carrillo makes two.

It looks to me a lot of venders make a rod for that engine. It ok to grind the crank .049'' under (NHRA allows -.070'') to 2.200'' crank pin size but nobody makes a rod bearing -.049'' under that fits into a 2.375'' housing bore. If I read the rules correctly spacers are not allowed in stock.

So if good bearings are not available just ask NHRA for a new rod, AKA the FE ford rule.

01-18-2016, 05:31 PM	#11
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,662 Likes: 1,953 Liked 10,822 Times in 2,250 Posts	Re: Lapping piston rings The NHRA approved rod list for the Pontiac 350, 389, 400,421,428, 455, it looks like all the OEM rods were the same size. 13 rods are listed on the approved list with only two rods as super stock only. Of the remaining 11 rods, nine are listed as the OEM size. Crower makes two, Oliver has three, Eagle has one, Childs and Albert has one, and Carrillo makes two. It looks to me a lot of venders make a rod for that engine. It ok to grind the crank .049'' under (NHRA allows -.070'') to 2.200'' crank pin size but nobody makes a rod bearing -.049'' under that fits into a 2.375'' housing bore. If I read the rules correctly spacers are not allowed in stock. So if good bearings are not available just ask NHRA for a new rod, AKA the FE ford rule. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817