Question about engine rubuilding

eeh1025 · 02-08-2003, 10:22 AM

Hi there i have a 86 gt with a 302, im geting the kit to rebuild it and it ask ask about the rod and main bearings being under sized or standard. is mine standard of undersize.
thanks alot

UglyFast88 · 02-08-2003, 10:50 AM

Well, you really have to take the engine apart first. Depending on what the crank looks like, (whether it can be polished up, or refinished) will depend on what bearings you'll need. If you can polish the crank back, you should be able to use the standard bearings. If the crank needs to be re-chromed, you'll need the undersize, since the diameter of the crank will be larger than before.

I'm in the same boat right now. Anyone actually gone through this from start to finish with a re-chrome?

Thanks, and if I'm wrong about anything above, please someone fix it!

flyin 5.8 · 02-08-2003, 02:19 PM

You'll have to pull the crank out and bring it to a machine shop and see what they need to do to it. or if you have a micrometer or calipers you can check it yourself. if the journals are tapered or scored real bad it will need to be turned.

UglyFast88, where you at in GR?

02-08-2003, 10:22 AM	#1
eeh1025 Registered Member Join Date: Feb 2003 Location: NJ Posts: 81	Question about engine rubuilding Hi there i have a 86 gt with a 302, im geting the kit to rebuild it and it ask ask about the rod and main bearings being under sized or standard. is mine standard of undersize. thanks alot

02-08-2003, 10:50 AM	#2
UglyFast88 Registered Member Join Date: Apr 2002 Location: Fordland Posts: 117	Well, you really have to take the engine apart first. Depending on what the crank looks like, (whether it can be polished up, or refinished) will depend on what bearings you'll need. If you can polish the crank back, you should be able to use the standard bearings. If the crank needs to be re-chromed, you'll need the undersize, since the diameter of the crank will be larger than before. I'm in the same boat right now. Anyone actually gone through this from start to finish with a re-chrome? Thanks, and if I'm wrong about anything above, please someone fix it! __________________ '88 Speed Density LX 1998 Explorer motor 1.7 Roller Rockers GT-40 lower ported & polished Cobra upper intake MAC CAI Aluminum Pullies FRPP P-Shortys Cop car cam (to insult) Competition Engineering F/R adjustables Flowmasters New black carpet and... '84 Racin' Tempo seats! Cars' best run in 2002 with stock 150,000 mile 302 with pullies, exhaust and roller rockers only... 13.27 at 101.5 mph

02-08-2003, 02:19 PM	#3
flyin 5.8 Registered Member Join Date: Apr 2002 Location: Holland, Michigan Posts: 73	You'll have to pull the crank out and bring it to a machine shop and see what they need to do to it. or if you have a micrometer or calipers you can check it yourself. if the journals are tapered or scored real bad it will need to be turned. UglyFast88, where you at in GR? __________________ If girls are made of sugar and spice, how come they taste like tuna? "Nitrous is like a hot chick with an STD . . . you want to hit it, but your afraid of the consequences."

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