Need Pontiac info

I am doing a 4.250 stroke 4.185 bore 400 Pontiac, heads flowing 330+ @ 28 inches. 468 cid

What kind of power will a stock 2 bolt block carry. Just as a 460 has been carried up over 1000 hp, I know that 800-850 is as far as I will build one for a customer.

What is a realistic hp number for a Pontiac? I can build 15:1 compression with a flat top with this deal, and that is what my customer is wanting, but I am a little nervous about this deal.

I'm thinking this thing will make 700 hp with the cam and intake optimized. Just afraid it may be a time bomb........ 

Anybody have any experience building and dynoing these engines.

I've only done a couple of street 389/400 motors years ago, Might talk with Adney Brown He's got the Pontiac disease.

They do have 4 bolt conversions for them and there where 4 bold blocks back in the day too.

I would place a call to Butler Performance. SUPER nice guys and they build some of the fastest pure Pontiac engines in the country. www.jbp-pontiac.com

Double hit....

Rich Osmond wrote:I would place a call to Butler Performance.  SUPER nice guys and they build some of the fastest pure Pontiac engines in the country.  www.jbp-pontiac.com

they in Lawrenceburg too!  

Get ahold of Big Chief............... 

richter69 wrote:Get ahold of Big Chief............... 

Big chief move Tee Pee full of crap................

Looks like 650 HP is tops on the great Wontonka  

richter69 wrote:Get ahold of Big Chief............... 

Was told he had the fastest pontiac in the country....

richter69 wrote:Get ahold of Big Chief............... 

 

Call Shawn or Jim ...................http://pickettsauto.com/Pickett_s_Auto_Racing.html


You may get close to 700 with a stock block but that's pretty much the limit.

TravisRice wrote:Call Shawn or Jim ...................http://pickettsauto.com/Pickett_s_Auto_Racing.html


You may get close to 700 with a stock block but that's pretty much the limit.  

Thanks for the info Travis, I think it would be best to hold him at around 650 hp. It should have killer torque with the runner size the heads have and run very well.

Blake,

As you know the lifter bosses hang out "naked" in those blocks and they are pretty much unsupported. Thus the need for some sort of lifter girdle or bracing for big roller cams. Many Pontiac guys had tried running the bigger cams and as a result broke the lifter bosses/bores out of the block.

Charlie

c.evans wrote:Blake,

As you know the lifter bosses hang out "naked" in those blocks and they are pretty much unsupported.  Thus the need for some sort of lifter girdle  or bracing for big roller cams.  Many Pontiac guys had tried running the bigger cams and as a result broke the lifter bosses/bores out of the block.

Charlie

A flat tappet is in this cats future..................... Thanks,

What heads and intake are you using?

Kaufman High ports and I'm not sure on the intake yet, but it will be a single plane to match the heads. Heads flow 330 out of the box and a good bowl job and they go 360 fairly easy.

Might be a good investment for the customer to get an aftermarket block?

Those heads have some pretty good potential as far as Pontiac stuff goes.

I would tell your customer to look into after market block or as charlie said some type of lifter bracing. A friend of mine just split his block two weeks ago right along lifter bosses--second time he has split a block, running high 9's in a firebird

The route he will have to take is a reduction in hp, he can't afford a good block.

To be safe I'd look at reducing the compression too.... 15:1 is pretty stout.

dfree383 wrote:To be safe I'd look at reducing the compression too.... 15:1 is pretty stout.

I'm suggesting going to the Edelbrock RPM heads. That will drop it to around 13:1

Damn shame to spend all that money on some good heads and rotating assemble and kill it because of a weak factory block.

The good iron blocks look to be about $3,000 +/- for the poncho's

Looks like tha Kaufman heads can hang with some SCJ / P-51's with the right work.

Some have them around 418 cfm at .800 lift. It's just the blocks are sky high..............

IDT-572 wrote:Some have them around 418 cfm at .800 lift.  It's just the blocks are sky high..............

only about $600-800 more than a A460 or Eliminator Block.

dfree383 wrote:

IDT-572 wrote:Some have them around 418 cfm at .800 lift.  It's just the blocks are sky high..............

only about $600-800 more than a A460 or Eliminator Block.

True, but you have to step back at some point, and he is there..............