As part of our site security measures, you may occasionally receive a captcha which helps us make sure there is no automated robot activity on the site. These non-SFI rated Small Block Chevy flex plates are suggested whenever installing a new engine or transmission. Keeping our site safe and secure is our top priority. I don't know if it has a 2 piece rear main seal or a 1 piece seal… The seal types are: Rope or wick, neoprene or split, one-piece. The one thing that throws a big, fat monkey wrench into the works is a design change to the rear main oil seal that Chevrolet's engineers made in '86 model year engines. IF your engine is an 85 or earlier, regardless of which side the dipstick is on, it will be a 2 piece seal. 1987-02 chevy gen 1 small block 1 pc. The change was made in the mid-80's. Add to Cart. Rest a … - No, 1985 and newer use 1-piece rear main seal and the oil pan (sump) is different at rear main seal. Use the Fel-Pro one piece gasket that matches your oil pan and don't overtighten the pan bolts. Our 350 Chevrolet small-block is a nice late-model four-bolt main truck block. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Raise the car with the help of a jack so that it becomes easy to reach the rear main seal. I don't believe in offsetting the seal ends though. One-piece is easy to tap in carefully with the trans. Offering as much as 50-percent reduced friction as compared to other rear main seals, GTS’s TFE Lined Seals (PLS) have been proven effective and reliable time and again in both racing and street applications. I tried searching for this on a few sites and just couldn't … Warranty. 99 Yes you can replace a 2 piece rear main seal on a SBC without pulling the crank, by just removing the pan and the rear cap. Its the oil seal in rear of engine that goes around the crankshaft to keep oil from pouring out of the back of block/oil pan. Have any Questions? Small Block Chevy - How to Choose a Flexplate. Another year of change was 1986.This is when the two piece rear main seal was replaced with a one piece unit. 3 - a little gasket sealant on the rearmain caps works wonders 4 - get the felpro one piece oil pan gasket Get the felpro seal and oil pan gasket, dont try and cheap out you will just replace the damn thing again. Order Chevrolet Corvette Rear Main Seals online today. **Images used in this site may be stock photos and not represent the actual part. $15.00 + shipping . How to replace a rear main oil seal on a 350 chevy truck - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. Our large inventory and huge warehouses allow us to offer some of the best prices around. Bare Engine Block #4500009 Big-Block Chevy, 2-Piece Rear Main Seal, Siamese Bore. Make sure you choose the … It was possible to replace a 2-piece rear main seal by removing the oil pan while the engine is still in the vehicle, but not with a one-piece rear main seal. These non-SFI rated Small Block Chevy flexplates are suggested whenever installing a new engine or transmission. $2,247.95. Felpro Rear Main Seal kit -- a double offset lip seal Part no. The trick is to oil-soak the seal and roll it out on a piece of plate glass until it slides around the crankshaft easily. on the inner and 35lbs on the outer with oil. Hey guys, I'm putting together a 350 on the stand with a 1 piece rear main. This seal is located between the engine an… Your car's engine rear main crankshaft seal is designed to give the engine oil leak protection from between the crankshaft output flange and theengine block. If you need to know for sure, remove the trans inspection cover and look between the flexplate and the engine. The one thing that throws a big, fat monkey wrench into the works is a design change to the rear main oil seal that Chevrolet's engineers made in '86 model year engines. I have a GMC with a 350CI small block Chevy engine. Check here for special coupons and promotions. BS11829-1 (fits 1959-1985) And a Oil pan gasket kit --- your choice -- one piece or a 4 piece cork whatever -- your preference. Visit Our "What's New" page to get all the latest Chevrolet Performance News, Announcements, and Specials. These non-SFI rated Small Block Chevy flexplates are suggested whenever installing a new engine or transmission. 1986 and older has a two piece rear main seal. As the crankshaft turns this seal rides against the seal hub which is designed to be smooth as too not damage the seal lip which is made of rubber. $23.50. This is how to tell, a 1 piece motor has a completely round flange and the seal rides on the perimiter of the flange. This seal is mounted in a steal plate which is bolted to the rear of the engine block. Crankshaft Front Seal Installer 303-1259 and Rear Main Seal Installer Tool 303-770 Fit for Ford 4.5L, 6.0L & 6.4L Powerstroke F-250/350/450/550 4.3 out of 5 stars 3 $258.99 $ 258 . Front and rear cap are 2 bolt. Because that … While the seal itself takes less than a half hour to replace by a qualified technician, getting to it is the hard part. Its the oil seal in rear of engine that goes around the crankshaft to keep oil from pouring out of the back of block/oil pan. Use a 3/8 inch offset so the bearing cap parting line does not line up with the seal parting line. Do you pull the trans to replace rear main seal in 1991 Chevy 350? Flywheel, Billet Steel, 168-Tooth, External Engine Balance, 25.000 lbs., 1-Piece Rear Main Seal, SFI 1.1, Chevy, V8, Each. The 1986 engine was all by itself for the following reasons. The most labor-intensive seal to replace on any engine is the rear main seal. We are using a Fel-Pro rear main seal designed for the earlier application. Oil pans and gaskets are not interchangeable between early and late design engines. Seal types There are three types of rear main crankshaft seals in use today; each offers its own features and benefits, along with concerns. Displacement of the block was also cast into the block next to the casting number. 261, 54-62 The gasket is expensive, about $30 but well worth it. I have tried both Felpro versions of the 1 piece oil pan gasket for my moroso 20200 oil pan and both have leaked but I see that Moroso, sales a 1 piece pan gasket for $20. Add to Wish List Add to Compare. Rear main seal is what keep oil from leaking out around the crank. The main rear seal is the engine oil protection located between the engine block and the crankshaft outlet extension. 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