N00b Posted December 9, 2018 Share Posted December 9, 2018 So i have a fresh built pontiac 455 Forged piston .60 over 10.5:1 comp Forged rods Wenzler alum heads Pontiac is new 2 me just wondering if a .60 over 455 block will take 75-100 shot Link to comment Share on other sites More sharing options...
Rexs 73GTO Posted April 18, 2019 Share Posted April 18, 2019 (edited) Depends on how the engine was built. You seem to have good parts but if the bearings aren't clearanced & rings the same just right it will last but not very long. 10.5 with the heads is a bit high for a big shot unless your racing it only. Keep your timing down low & don't take it to much over 6000 rpm's as Pontiac makes power down low not at the top like a chevy. If you over rev it it will be gone in no time. Plus you didn't say what cam your using, what pistons, & which rods. Just because there forged doesn't make them all that strong. If the forged pistons are to heavy???? Was the engine balanced & line bored ? If all you did was put in new parts that to will make it go away very soon. Also did a Pontiac person build the engine or was it like most built by a chevy person & that in itself spells trouble. Oil pump,?? There are a lot of little things that need to be done to a Pontiac engine that a chevy builder will over look & cause you all kinds of trouble. Edited April 18, 2019 by Rexs 73GTO needed more info Link to comment Share on other sites More sharing options...
Stripes Posted May 12, 2020 Share Posted May 12, 2020 of course it will, if the engine was assembled properly. I regularly ran a 200 kit on a 400 with stock rods and crank. Don't run it lean, meaning you better design and ensure an adequate fuel supply or it will melt your pistons like butter in a volcano. Link to comment Share on other sites More sharing options...
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