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Forum: Pontiac - Street 03-15-2024, 04:17 PM
Replies: 11
Views: 881
Posted By steve25
This cutter from Goodson supply and a electric...

This cutter from Goodson supply and a electric drill will allow you to cut the tops of the guides for the .530” seals you will need to run.
Forum: Pontiac - Street 03-15-2024, 03:11 PM
Replies: 11
Views: 881
Posted By steve25
Happy with that level of HP you mean in your...

Happy with that level of HP you mean in your heavy car?

It’s torque that accelerates mass, not HP.

HP is much more of a factor in MPH .

If when you get the funds for aftermarket head and...
Forum: Pontiac - Street 03-15-2024, 10:43 AM
Replies: 11
Views: 881
Posted By steve25
Use new valves, and yes they will not have the...

Use new valves, and yes they will not have the needed second groove for the factory valve stem O ring if they are SS.

This then means each valve guide too will need to be machined for a positive...
Forum: Pontiac - Street 06-12-2023, 10:24 PM
Replies: 74
Views: 7,312
Posted By Gach
I’m sure you’ve price it out, save yourself some...

I’m sure you’ve price it out, save yourself some time and allot of aggravation and get a nice balanced rotating Assembly from Butler. When your ready let me know and I’ll pick it out for you. I’ll...
Forum: Pontiac - Street 06-12-2023, 08:56 PM
Replies: 74
Views: 7,312
Posted By Gach
I mean the 4.25 stroke crank would definitely be...

I mean the 4.25 stroke crank would definitely be better. You really don’t have to. I would but that just me
Forum: Pontiac - Street 06-12-2023, 04:19 PM
Replies: 74
Views: 7,312
Posted By Gach
This is called the think tank. Do I want to build...

This is called the think tank. Do I want to build 500 hp motor and make the changes needed a year or two down the road.
Forum: Pontiac - Street 06-12-2023, 04:09 PM
Replies: 74
Views: 7,312
Posted By Stan Weiss
Since you want it to run on pump gas. How miles...

Since you want it to run on pump gas. How miles per year you are you looking at driving, and does what it gets for MPG factor into this?

Stan
Forum: Pontiac - Street 06-12-2023, 04:06 PM
Replies: 74
Views: 7,312
Posted By Gach
Trubo 400 trans, with 3200-3500 stall convertor...

Trubo 400 trans, with 3200-3500 stall convertor and 3.55 or 3.70 gear. Or that 500 hp will feel like a dog. Got you really thinking now.
Forum: Pontiac - Street 06-12-2023, 03:53 PM
Replies: 74
Views: 7,312
Posted By b-man
Keep in mind you’re building an engine to tug...

Keep in mind you’re building an engine to tug around a relatively heavy 1966 big Pontiac with highway gears.

You haven’t detailed what drivetrain modifications if any your willing to do to mate up...
Forum: Pontiac - Street 06-12-2023, 03:25 PM
Replies: 74
Views: 7,312
Posted By Stan Weiss
X2 This will be your least cost, and parts that...

X2 This will be your least cost, and parts that Pontiac was willing to put a new car warranty on.

Stan
Forum: Pontiac - Street 06-12-2023, 02:54 PM
Replies: 74
Views: 7,312
Posted By Gach
For what you want to do…I’d get the Crower 60919...

For what you want to do…I’d get the Crower 60919 cam. Plus your going to need a intake to go with it. Its not a real choppy cam, but definitely has some good sound to it. Push rods once you determine...
Forum: Pontiac - Street 06-12-2023, 02:53 PM
Replies: 74
Views: 7,312
Posted By b-man
Blueprinted 1968 428 HO with a true 10.75:1...

Blueprinted 1968 428 HO with a true 10.75:1 compression ratio made 432 HP with HO exhaust manifolds and a real factory 068 cam. No porting work on the #16 heads:
...
Forum: Pontiac - Street 06-12-2023, 02:51 PM
Replies: 74
Views: 7,312
Posted By locomotivebreath
Gach makes some good points . I should add that...

Gach makes some good points . I should add that when I had my 16’s done at BES racing in about 2012 , the shop bill was within about $500 of new heads from edelbrock or Kaufman and still don’t flow...
Forum: Pontiac - Street 06-12-2023, 01:07 PM
Replies: 74
Views: 7,312
Posted By locomotivebreath
Just a for what it’s worth . I did a 68 400/406 ,...

Just a for what it’s worth . I did a 68 400/406 , original engine for my GTO . The 16 heads are mildly ported to flow 230 cfm , small bullet HR 226/230 (280/288 adv ) .518 lift , 1.5 Harland sharps...
Forum: Pontiac - Street 06-12-2023, 01:04 PM
Replies: 74
Views: 7,312
Posted By Stan Weiss
Dennis Jensen post this build here some time ago ...

Dennis Jensen post this build here some time ago



Stan
Forum: Pontiac - Street 06-11-2023, 09:16 PM
Replies: 74
Views: 7,312
Posted By Gach
I gotcha…yeah that’s very pricey. Well its really...

I gotcha…yeah that’s very pricey. Well its really going to depend on gas that’s available in your area. I think 428’s were rated at 10.75 compression. Most likely run on 93 octane gas. One thing for...
Forum: Pontiac - Street 06-11-2023, 08:08 PM
Replies: 74
Views: 7,312
Posted By Gach
This is crazy my 69 GP had 428 in it. It...

This is crazy my 69 GP had 428 in it. It surprised allot of guys I took for a ride. That was back when I was into doing burn outs. Good that thing would smoke tires for ever. Sold the GP put a junk...
Forum: Pontiac - Street 06-11-2023, 07:58 PM
Replies: 74
Views: 7,312
Posted By PAUL K
X 2 .... Built properly a 428 will amaze all your...

X 2 .... Built properly a 428 will amaze all your friends!
Forum: Pontiac - Street 07-15-2022, 09:44 PM
Replies: 74
Views: 7,312
Posted By blueghoast
That 428 will make all the power you'll need with...

That 428 will make all the power you'll need with the 428 crank.
450hp and 500 lbs you'd be amazed with much power. I'm pretty sure.

GT
Forum: Pontiac - Street 07-15-2022, 08:23 AM
Replies: 74
Views: 7,312
Posted By i82much
build a good short block and use the top end you...

build a good short block and use the top end you have, upgrade later if it is not enough. good chance a stroker with iron d ports will give you plenty of giggles for the foreseeable future.
Forum: Pontiac - Street 07-15-2022, 07:06 AM
Replies: 74
Views: 7,312
Posted By 25stevem
If you want that much torque ( 550 ft lbs...

If you want that much torque ( 550 ft lbs minimum) you will need to greatly port those heads or run aftermarket heads, and you will need to stroke the motor if you want to stay at under 10 to 1...
Forum: Pontiac - Street 07-15-2022, 06:46 AM
Replies: 74
Views: 7,312
Posted By 64speed
Edelbrock heads are worth it in my experience

Edelbrock heads are worth it in my experience
Forum: Pontiac - Street 11-15-2019, 10:54 AM
Replies: 62
Views: 6,606
Posted By Formulas
In general stroke gets you torque you can buy...

In general stroke gets you torque you can buy longer stroke crankshafts that will fit your 389 adjust piston dish as required for any given head and you dont need any whiz bang heads for cruising...
Showing results 1 to 23 of 23

 
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