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

onetrick56's 1964 Grand Prix

2020 September
of the Month

  • Welcome!

    Welcome to Forever Pontiac, where we keep the memory of Pontiac alive with great discussion, maintenance tips, restoration/modification progression "blogs" and help from professional & DIY mechanics. Also, wonderful competitions that occur regularly. Please register for an absolutely free account to join in!

New to the group 73 Grand Prix


Recommended Posts

Tired of these Ads? Register Today!

  • Founders

:welcomeFP:

Look forward to hearing about your progress on the GP

  • Like 1
Link to post
Share on other sites

Welcome to FP.

So what is the inspiration/perspiration between the 455-to-LS 5.3 swap besides "because I can"? You looking for better milage, reliablitiy, one fell out of the sky and into my lap? LS motors are great to be sure.

  • Like 1
Link to post
Share on other sites

Welcome! Sounds like a cool project. Looking forward to watching your build.

  • Like 1
Link to post
Share on other sites
10 hours ago, Frosty said:

Welcome to FP.

So what is the inspiration/perspiration between the 455-to-LS 5.3 swap besides "because I can"? You looking for better milage, reliablitiy, one fell out of the sky and into my lap? LS motors are great to be sure.

It’s literally all those reasons. I live in Colorado Springs at high elevation, I don’t wanna drive this car and have to worry about tuning the carb as I come down, just something I thought about. Then comes gas mileage for the long drive to a car show and use  Sparks in the Ozarks in Noel, MO, that big block is gonna get pretty crappy mileage. The story on the motor I have, I work at a mom and pop dealership as their tech. We had a 09 Tahoe they were in cheap it had 2 collapsed lifter’s and told them let’s just toss a junkyard motor in it and call it a day. I asked my boss what the core charge on the motor, it was $300 bucks. So now I’m doing cam, springs, lifters, dod delete.

7 hours ago, Pontiac 4 Life said:

Welcome! Sounds like a cool project. Looking forward to watching your build.

Thank you

11 hours ago, Ringo64 said:

:welcomeFP:

Look forward to hearing about your progress on the GP

Thank you 

Link to post
Share on other sites
12 hours ago, 719FON said:

It’s literally all those reasons. I live in Colorado Springs at high elevation, I don’t wanna drive this car and have to worry about tuning the carb as I come down, just something I thought about. Then comes gas mileage for the long drive to a car show and use  Sparks in the Ozarks in Noel, MO, that big block is gonna get pretty crappy mileage. The story on the motor I have, I work at a mom and pop dealership as their tech. We had a 09 Tahoe they were in cheap it had 2 collapsed lifter’s and told them let’s just toss a junkyard motor in it and call it a day. I asked my boss what the core charge on the motor, it was $300 bucks. So now I’m doing cam, springs, lifters, dod delete.

I get about 12-14 MPG with my 455/400TH/3.55 erar combination with the top up on the highway. Not bad in my opinion. However, I see your points.

$300 for an LS motor? Where do I sign up? How many miles on the core motor? Do you have to do any machine work or anything preventative?

Sounds like a way cool project. Be sure to keep us abreast of your progress.

  • Like 1
Link to post
Share on other sites

Welcome bro, cant wait to see her laid out. I'm a huge fan of all things lowrider!

  • Thanks 1
Link to post
Share on other sites
On 8/11/2020 at 6:28 AM, Frosty said:

I get about 12-14 MPG with my 455/400TH/3.55 erar combination with the top up on the highway. Not bad in my opinion. However, I see your points.

$300 for an LS motor? Where do I sign up? How many miles on the core motor? Do you have to do any machine work or anything preventative?

Sounds like a way cool project. Be sure to keep us abreast of your progress.

Do you really get that off that motor? That’s really not bad at all either. Yeah $300 core. No no machine work, Block looks solid just hoping to cam and springs and call it a day. I wanna say when I pulled it, the Tahoe had like 175k.

Link to post
Share on other sites

Yes I do get that mileage. I record my mileage and gas consumption every time I drive from Michigan to West Virginia for the annual car show in Charleston. It's a combination of expressway and US highways. It's about a 7 hour, 400 miles trip one-way. Drop the top and the mpg drops to around 8 mpg. But hey - it's a convertible - what do you expect?

I know LS motors are stout, but if this was my motor with 175k miles on it, I'd be looking at a set of new bearings, some general block clean up, and perhaps have the crank and bores inspected for wear. Some light port and polish work on the heads (nothing radical - just improve overall flow). Then go with whatever performance improvement parts I had in mind. However, I get that money talks too. It's your wallet at work here. I have not forgotten that. It's merely a suggestion for longevity.

  • Like 1
Link to post
Share on other sites

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.