Charger3488 Posted March 14, 2013 Share Posted March 14, 2013 I have a question my fellow brothas i have a gen 5 502 block stamped 8.2l 502 i called an asked for a oil pan gasket but the tech guy said it was a 454 bored over to a 502 gm did not instal them in everyday vehicles. But from my own research 502 big blocks were not installed in every day vehicles but gm was using them in the 80's and 90's fleet vehicles and army transports. Can anyone confirm this or lend their expertise? Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted March 14, 2013 Share Posted March 14, 2013 if that was true...why would the casting on the side say 8.2L??? 454 blocks can't be bored that big, that's .250 over a 454 bore!!! they did use a GEN V block on the Late 80's and 90's but they aren't the same as a 502 block, they were cast with 7.4L on the side Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted March 14, 2013 Share Posted March 14, 2013 Late 454s have 7.4 on the block, 502s like yours have the 8.2 0n the block. 502s were not offered in any vehicle. They are over the counter items. You need a oil pan gasket for a one piece rear main seal big block. Like Sam said it is not a over bored 454. The 502s have siamese cylinder walls to allow the large bore. GM did supply a lot of 8.1L engines for the military and others uses. The 8.1 is the gen7 big block. Pan rails are different, heads are different, block is taller, and lots of other little things. Quote Link to comment Share on other sites More sharing options...
72 LS5 Posted March 14, 2013 Share Posted March 14, 2013 Any Gen V or VI 454/502 pan gasket should fit. I'd either get it from a gm dealer or through Jegs or Summit. A parts store will probably have to look it up by vehicle, which won't work. Quote Link to comment Share on other sites More sharing options...
Charger3488 Posted March 15, 2013 Author Share Posted March 15, 2013 thanks guys I thought so I believe he was a hater anyway its good to have brothas like ya'll. I have another question can any one send me a link for the arp bolt kits I need plus the oil pump I need Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted March 15, 2013 Share Posted March 15, 2013 Here are a couple Jegs Summit Quote Link to comment Share on other sites More sharing options...
Charger3488 Posted March 16, 2013 Author Share Posted March 16, 2013 wat bout oil pump and head bolts intake bolts oil pan n trans bolts Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted March 16, 2013 Share Posted March 16, 2013 same Quote Link to comment Share on other sites More sharing options...
Charger3488 Posted March 24, 2013 Author Share Posted March 24, 2013 Can you send me a link for head gaskets I should use with my 502 to prevent water leaks. I'm looking at fel-pro but I like cometics and their custom gaskets a friend of mines told me that head gaskets play a role in engine compression the smaller the thickness the higher the compression and the thicker it is the lower the compression. I know 502 came with one piston design and with my 110 cc heads the compression will be around 9.7.1 but with the gasket being .25 thick the compression should be around 10.1 or higher like 10.7.1 so ill still be able to run unleaded gas. Can you help me with wat arp kit I should use send me links they'll be so much appreciated part number s will be heaven sent...........thanks Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted March 24, 2013 Share Posted March 24, 2013 you also have to take the deck height, and quench height into consideration here too, to get an accurate static compression ratio deck height=how far down the piston is in the cylinder and figure out the CC's head gasket volume CC's piston volume either + or - CC's quench=the distance from the flat part of the top of the piston to the flat part of the cylinder head combustion chamber, and you don't want this less than .035!!! I like mine to be .040-.045 then there's the dynamic compression ratio which takes the opening and closing points of your valves into consideration. this is a more accurate way to figure if you can still run pump gas if you don't figure in all of these things, you really don't know where your compression is, but the dynamic compression is what you really want to know to see if you can run pump gas or not Quote Link to comment Share on other sites More sharing options...
Charger3488 Posted March 25, 2013 Author Share Posted March 25, 2013 im confused now this stuff is like rocket science Quote Link to comment Share on other sites More sharing options...
72 LS5 Posted March 26, 2013 Share Posted March 26, 2013 Are you using the Gen V heads that came with the motor? If you use earlier Mark IV heads, you have to use a specific gasket to ensure the larger water jackets of the Gen V block are covered. Quote Link to comment Share on other sites More sharing options...
Charger3488 Posted March 27, 2013 Author Share Posted March 27, 2013 Naw im using edelbrock e street heads. 290 intake 110 cc 118 exhaust. and my camshaft lift is 556/542 intake /exhaust duration 254/271. will my compression be 9.7? and what rear gears should i run? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.