Jump to content
Forums Gone... but not forgotten!
Pontiac of the Month

JayByrd's 1986 Grand Prix

2024 December
of the Month

  • Rev up your passion for Pontiacs and join our vibrant community of enthusiasts!

    Whether you're a die-hard fan of classic muscle cars or you've got a soft spot for sleek modern models, you've found your home here at Forever Pontiac. Our community is dedicated to celebrating everything Pontiac, from the iconic GTO to the legendary Firebird and everything in between.

    Unlock access to expert advice, stunning photo galleries, engaging discussions, exclusive events, and more!

    Start your Pontiac journey with us today!

    Sign up now! 🏁

Recommended Posts

Posted

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

 

  • 4 months later...

Tired of these Ads? Register Today!

Posted (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 by Rexs 73GTO
needed more info
  • 1 year later...
Posted

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.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Tired of these Ads? Purchase Enhanced Membership today to remove them!
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.