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Old 03-04-2021, 11:49 AM
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Originally Posted by pastry_chef View Post
I haven't seen it with a Pontiac but I have many examples that clear 600 HP with 46x cubes and similar hydraulic rollers.

This uses an Isky 238 / 248 with .578 / .608 - 109 LSA.
https://www.youtube.com/watch?v=rIIoazbO0d0
Hits 600 HP @ 5400 RPM and continues to climb.

Induction flowing 300 ish isn't going to do it.
I haven't seen it with a Pontiac either but have with other brands, if we are talking about pump gas. I did 600hp with a 460 BBC using a 242/248 cam and an excellent set of AFR heads.
I've never been able to do that with a 455 Pontiac, even some more rambunctious Pontiacs with a 254/262 cam and 330 cfm conventional Eddy heads. They'll make a crap load of torque though.

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Old 03-04-2021, 12:09 PM
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I'm building a very similar set up but it has not been on a dyno yet either. 462, 10.5:1, 325 CFM E heads, 242/248 HR, Johnson short travel lifters, Crower 1.6 rockers, Northwind port matched, Sniper EFI.

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  #63  
Old 03-04-2021, 12:29 PM
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Originally Posted by TransAm400 View Post
I'm building a very similar set up but it has not been on a dyno yet either. 462, 10.5:1, 325 CFM E heads, 242/248 HR, Johnson short travel lifters, Crower 1.6 rockers, Northwind port matched, Sniper EFI.
Sounds like a really nice combo

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Old 03-04-2021, 12:37 PM
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Originally Posted by TransAm400 View Post
I'm building a very similar set up but it has not been on a dyno yet either. 462, 10.5:1, 325 CFM E heads, 242/248 HR, Johnson short travel lifters, Crower 1.6 rockers, Northwind port matched, Sniper EFI.
I'd be interested in your dyno numbers when you get them. My combo is nearly identical to yours, also throttle body EFI, same heads but less duration and likely less lift as I used the OF 2 cam.

BTW, the Northwind was definitely holding back my combo, it had unusual cylinder filling for # 6 and # 8. My hood clearance would not permit a spacer, but if you can use a spacer some of that might clear up. Sometimes the throttle body EFI's don't like certain manifolds due to the way the fuel is dispersed- and this is a good example. The displacement is a typo- it's 467 CID.


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  #65  
Old 03-04-2021, 12:43 PM
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Originally Posted by TransAm400 View Post
I'm building a very similar set up but it has not been on a dyno yet either. 462, 10.5:1, 325 CFM E heads, 242/248 HR, Johnson short travel lifters, Crower 1.6 rockers, Northwind port matched, Sniper EFI.
Agree, nice combo. Looks like a nice collection of vehicles you have which car is it going in?

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  #66  
Old 03-04-2021, 12:47 PM
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Originally Posted by darbikrash View Post
I'd be interested in your dyno numbers when you get them. My combo is nearly identical to yours, also throttle body EFI, same heads but less duration and likely less lift as I used the OF 2 cam.

BTW, the Northwind was definitely holding back my combo, it had unusual cylinder filling for # 6 and # 8. My hood clearance would not permit a spacer, but if you can use a spacer some of that might clear up. Sometimes the throttle body EFI's don't like certain manifolds due to the way the fuel is dispersed- and this is a good example. The displacement is a typo- it's 467 CID.

Nice!

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Old 03-04-2021, 01:13 PM
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Originally Posted by blueghoast View Post
I would like to see a dyno sheet on that one, I don't think it's possible
with that small a cam. I just dynoed one of my motors and it was hard
to get over 600 hp. Mine made 625.6 hp and 634 lbs I was hoping for more.
I'll get a dyno sheet up here soon.

GT.
I don't have any dyno tests for my engine..but it has gone 126.44 at 3700lbs and 127.13 at 3725lbs .236/.246 .391/.400 with 1.65 rockers 112 ls..this in a car not optimized for the qtr mile
The head porter has seen over 600 hp with the head/cam package. I just need to get a bit more tuning on this combo and push the mph up and drop the et.

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  #68  
Old 03-04-2021, 03:58 PM
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Originally Posted by ta man View Post
I don't have any dyno tests for my engine..but it has gone 126.44 at 3700lbs and 127.13 at 3725lbs .236/.246 .391/.400 with 1.65 rockers 112 ls..this in a car not optimized for the qtr mile
The head porter has seen over 600 hp with the head/cam package. I just need to get a bit more tuning on this combo and push the mph up and drop the et.
Weight and MPH says 569 Hp, what is your ET?

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  #69  
Old 03-04-2021, 04:50 PM
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Weight and MPH says 569 Hp, what is your ET?
Mine says 597hp for 127@3725. Guess calculator dyno's very just like real dyno's lol

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Old 03-04-2021, 04:53 PM
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For us to make 600hp from 460'ish ci stock block pump gas friendly engines you'll need a very got set of heads and intake. An no cfm isn't everything when i say that. I bet most underperforming build are due to poorly done heads/intakes. Just because a piece of paper says the heads are good doesn't mean they are!!

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Old 03-04-2021, 04:54 PM
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Originally Posted by Formulajones View Post
I haven't seen it with a Pontiac either but have with other brands, if we are talking about pump gas. I did 600hp with a 460 BBC using a 242/248 cam and an excellent set of AFR heads.
I've never been able to do that with a 455 Pontiac, even some more rambunctious Pontiacs with a 254/262 cam and 330 cfm conventional Eddy heads. They'll make a crap load of torque though.
Just curious what size headers where on the bbc?

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Old 03-04-2021, 05:23 PM
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Just curious what size headers where on the bbc?
.. 2"

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Old 03-04-2021, 05:27 PM
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Originally Posted by slowbird View Post
For us to make 600hp from 460'ish ci stock block pump gas friendly engines you'll need a very got set of heads and intake. An no cfm isn't everything when i say that. I bet most underperforming build are due to poorly done heads/intakes. Just because a piece of paper says the heads are good doesn't mean they are!!
Yep, with a very good set of heads, it wouldn't take a bunch of camshaft either.

I think it could easily be done with a set of wide ports or something of the sort without spending gobs of money.

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Old 03-04-2021, 06:04 PM
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Originally Posted by Formulajones View Post
Yep, with a very good set of heads, it wouldn't take a bunch of camshaft either.

I think it could easily be done with a set of wide ports or something of the sort without spending gobs of money.
Wide port stock block pump gas is my next build. Gather parts now.
Just need to get this one finished. Would love to see 600hp with this one but i think the rpm intake and no frills short block will hamper that

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Old 03-04-2021, 06:29 PM
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I'd love to hear more about the wideport build when you get that far.

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Old 03-04-2021, 07:31 PM
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581 hp.

  #77  
Old 03-04-2021, 08:00 PM
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Originally Posted by Formulajones View Post
I'd love to hear more about the wideport build when you get that far.
Made up of used/spare parts mostly. Should be a fun/interesting build. I'll start a new thread once i get further along with it.

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Old 03-04-2021, 08:34 PM
ta man ta man is offline
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Originally Posted by AG View Post
Weight and MPH says 569 Hp, what is your ET?
10.76..thats with a mild convertor and gearing 91 octane and 16mpg..others with the same heads/cam have seen 20mpg

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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
  #79  
Old 03-04-2021, 09:03 PM
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An no cfm isn't everything when i say that. I bet most underperforming build are due to poorly done heads/intakes. Just because a piece of paper says the heads are good doesn't mean they are!!
Truth.

Darin Morgan just went to work at BES this week.

Quote:
Simple airflow capacity should never be the first consideration in evaluating cylinder heads. Characteristics that are far more important include air speed, port cross-section, port volume and shape, and the relationship between the size of the throat and the valve seat.
IMO knowing most of these variables are also important to cam an engine well.

https://www.enginebuildermag.com/201...ers-need-know/


Last edited by pastry_chef; 03-04-2021 at 09:09 PM.
  #80  
Old 03-04-2021, 10:25 PM
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Made up of used/spare parts mostly. Should be a fun/interesting build. I'll start a new thread once i get further along with it.
....

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