dc_sniper9130

Hey guys,

I had a question about rear main seals. I'm buying some stuff from Summit that specifies a 2-piece seal, but do i really need to use a 2-piece with it? The parts in question are the crank and oil pan below.

http://store.summitracing.com/partdetail.asp?autofilter=1∂=SPE%2D4988&N=700+4294925024+4294908216+4294908198+4294925232+4294840045+4294881326+115&autoview=sku
http://store.summitracing.com/partde...w=1&N=700+150+

Logic would dictate that a 1-piece is easier to deal with, and the crank comes in a 1-piece version, but that oil pan doesn't, and I'd really like a finned aluminum one. Does the specification of the 1-piece or 2- piece really matter? If so, how much of an issue really is the maintenance of the 2-piece vs the 1 piece? Could someone please enlighten me?

SpitotRs305

the 2 piece pan wont work with a 1 piece RMS... 2 piece RMS have been around for a very long time they work and so do the 1 piece jobbers but a 2 piece seal is a little more tricky to get right if you havent done it before... and i believe that you can not use the 1 piece crank in a 2 piece block however they do make an adaptor to run a 2 piece crank in a one piece block

dc_sniper9130

yeah, i have a 1970 block, which would be a 2-piece. this is my first motor build so forgive the slight case of retard.


-tony

Apeiron

Your block will be 2 piece RMS if it was made before 1986, or 1 piece RMS if made after. All the other parts have to match the block.

SpitotRs305

well what about me my engine was assembled in 94 but it still has a 2 piece RMS.

dc_sniper9130

from the factory or rebuilt? if its a rebuilt you probably have a pre-86 block.

SpitotRs305

nope straight from GM goodwrench

Apeiron

"Replacement" crate engines can still be had with a 2 piece main, most notably the "Hecho en Mexico".

SpitotRs305

yeah just hope mexicans like turbo

Apeiron

Well, the "Targetmaster" and "Goodwrench" replacement engines aren't exactly known for their outstanding build quality, so putting one on boost might be entertaining.

SpitotRs305

well i dont care some say they are cheaply made others say there is no difference from the ones cast in the united states... most 4 bolt mains come from mexico

Apeiron

I don't know if it's a question of the quality of the casting or the machining, they're just made as inexpensive low-performance replacement engines.

SpitotRs305

well i got it free... do to some creative wheeling and dealing so if it cracks then it cracks.. but if it cracks it better crack right in 2 cause i will be pissed if its junk and doesnt look like it was fun

sully91rs

Thats how to live hahaha. Good luck with it.

fbodyorbust

no real imput here.....just that rear mains are a pain in the ***!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!............thats all......