PONTIAC ZONE TECH FORUMS
 

Go Back   PONTIAC ZONE TECH FORUMS >
Engine Tech
> Aftermarket News & Products
User Name
Password

sponser links

Reply
 
Thread Tools
Old 10-02-07, 01:10PM   #1
Steve C
Verified User
 
Join Date: Dec 2002
Location: .
Posts: 993
Default Congrats Andy Mitchell on BBC build

First, I couldn't get the section for Andy Mitchell on the board to work so I'll post here. Second, yes I know its a Big Block Chevy.... but Andy posts and hangs here and he should some recongition.

Good job Andy !

This is about a 496 BBC called "The Howitzer" built for a heavy street car, but more important it's a "real" street motor with some fantastic numbers. Just think 505 Pontiac if you choose to read the article.

Here is a comment from the article about the Torque.....

"Want to propel a heavy street machine with explosive power? The Howitzer was revealing itself to be the ideal weapon, with a numbing 600 lb-ft churning right from 3,200 rpm, climbing to a peak of 635 lb-ft at 3,800 rpm. Wow, that's a lot of torque, and it comes in right now! We've seen some engines build a lot of low-end torque, only to give up low in the rpm range with no big horsepower bang up top. This isn't the case with The Howitzer."
Article here:
http://www.popularhotrodding.com/tec...car/index.html
Steve C is offline   Reply With Quote
Old 10-02-07, 01:32PM   #2
Bnick166
Registered User
 
Join Date: Aug 2005
Location: Butler, Pa
Posts: 261
Default

Congratulations Andy! I'm interested in seing a build like this one using the new CV-1 Cylinder heads.
Bnick166 is offline   Reply With Quote
Old 10-02-07, 07:54PM   #3
Gach
Administrator
 
Gach's Avatar
 
Join Date: May 2003
Location: ....
Posts: 18,517
Default

Steve c everyone desided it was best to get rid of the Q&A that
way it wouldn't limit Andy or P-Dude. We just haven't taken the links
down yet. I read the whole article, great job Andy. Steve did you notice
the cc runner those heads have 320 cc, the reason I mention this is
a while back ( not you ) but a few were saying that the CV-1 head
with a 300 cc runner was to big for the street, makes you kind of want
to laugh now dosen't.
Gach is offline   Reply With Quote
Old 10-03-07, 05:46PM   #4
Steve C
Verified User
 
Join Date: Dec 2002
Location: .
Posts: 993
Default

Gach, When you compare intake runner volume do remember the one common denominator is that the ports be the same length. Example, you canít compare the port volumes of the new 18-degree conventional heads with a 24-degree conventional head just like you canít compare the volumes of a SBC to a BBC port because their ports are different lengths! And if you go back to the talk about the CV-1 head I did in fact state (or imply) that under some circumstances it's larger intake runner volume could in fact be to large for a street application. Again, many variables involed .... like the intended rpm range, converter & gears in use, etc.
Steve C is offline   Reply With Quote
Old 10-03-07, 06:14PM   #5
Gach
Administrator
 
Gach's Avatar
 
Join Date: May 2003
Location: ....
Posts: 18,517
Default

Steve, I see and a very good point.
Gach is offline   Reply With Quote
Old 10-03-07, 09:01PM   #6
Steve C
Verified User
 
Join Date: Dec 2002
Location: .
Posts: 993
Default

Yes, and a touchy subject at times, that runner volume topic
Andy himself touched on the subject within the 72cc Edelbrock streetabilty post in another forum here ... he said, "The wide ports maybe a little big for best results for a street motor(torque peak),what do they flow?"
The Howitzer heads flowed 328/356 cfm intake, and 276 cfm on the exhaust.

Over 600 ft.lbs torque from 3200 up thru 5300 rpm. And all under 6000 peak rpm. Yes sir, nice street combo for that heavy car.
Steve C is offline   Reply With Quote
Old 10-03-07, 09:27PM   #7
Gach
Administrator
 
Gach's Avatar
 
Join Date: May 2003
Location: ....
Posts: 18,517
Default

Quote:
Originally Posted by Steve C View Post
Yes, and a touchy subject at times, that runner volume topic
Andy himself touched on the subject within the 72cc Edelbrock streetabilty post in another forum here ... he said, "The wide ports maybe a little big for best results for a street motor(torque peak),what do they flow?"
The Howitzer heads flowed 328/356 cfm intake, and 276 cfm on the exhaust.

Over 600 ft.lbs torque from 3200 up thru 5300 rpm. And all under 6000 peak rpm. Yes sir, nice street combo for that heavy car.
As long as you have good low lift flow numbers the runner volume is
not really a big issue, it's the rpms you intend to turn the motor that
comes into play, the cam choice it the bigger issue. If I went with
say a 264/267 with 640 lift on a 110, my motor with have peak
around 5300-5500 rpms, and it only has 271 runner. That's my whole point, the Howtzer made it by 5300 in spite of having a 320 runner.

Duration, not lift determines what rpm the motor peaks at. If I had the
CV-1 head with that 300 cc runner 850 HP would not have been out of
the question.
Gach is offline   Reply With Quote
Old 10-04-07, 08:41PM   #8
ANDY MITCHELL
Engine Builder
 
ANDY MITCHELL's Avatar
 
Join Date: Jul 2005
Location: UPLAND CALIFORNIA
Posts: 344
Default

Just found this post by Steve

Thanks steve & Gach

The engine belongs to the editor Jonny Huggins and is in his Chevelle ,he came for a BBQ at our house a few weeks ago we went for a test drive and i can confirm this is a great street driver it drives great and he drives it everywhere!

Next Month there is a 509 BBC with a 8/71 on pump gas that i built for a friend of mine Alex Maldenaldo who i might add is mainly a Poncho guy,but this one is going in a 57 pro Street Chevy very cool car,motor made close to 800HP and 770 LB/FT it will make good reading as the artical was writen by none other then David Vizard .

Alex's other cars
66 Pro Street GTO with one of our 455's in it

67 Pro Street GTO with a 455 E heads and Magnesium Doug Nash tunnel ram

69 Gto 4 speed we are turning his 400 into a 467 at the shop now going to be a sleeper and have #62 heads ported with RA1V intake and q-jet

70 Trans Am with 455 HO engine (this is an original T/A 455 HO car with #64 heads,our next engine project after the 69)

69 lemans
70 lemans future project.
__________________
"Life is like an engine",it begins full of air and energy,mid way it has a little blow by,at the end it throws a rod.
ANDY MITCHELL is offline   Reply With Quote
Old 10-04-07, 09:38PM   #9
tempestgto
Registered User
 
tempestgto's Avatar
 
Join Date: Jul 2002
Location: trumbull, ct
Posts: 107
Default

congrats as always andy. great work, can we see a pic of that pro street 66?
tempestgto is offline   Reply With Quote
Old 10-04-07, 10:44PM   #10
ANDY MITCHELL
Engine Builder
 
ANDY MITCHELL's Avatar
 
Join Date: Jul 2005
Location: UPLAND CALIFORNIA
Posts: 344
Default

Quote:
Originally Posted by ANDY MITCHELL View Post
Just found this post by Steve

Thanks steve & Gach

The engine belongs to the editor Jonny Huggins and is in his Chevelle ,he came for a BBQ at our house a few weeks ago we went for a test drive and i can confirm this is a great street driver it drives great and he drives it everywhere!

Next Month there is a 509 BBC with a 8/71 on pump gas that i built for a friend of mine Alex Maldenaldo who i might add is mainly a Poncho guy,but this one is going in a 57 pro Street Chevy very cool car,motor made close to 800HP and 770 LB/FT it will make good reading as the artical was writen by none other then David Vizard .

Alex's other cars
66 Pro Street GTO with one of our 455's in it

67 Pro Street GTO with a 455 E heads and Magnesium Doug Nash tunnel ram

69 Gto 4 speed we are turning his 400 into a 467 at the shop now going to be a sleeper and have #62 heads ported with RA1V intake and q-jet

70 Trans Am with 455 HO engine (this is an original T/A 455 HO car with #64 heads,our next engine project after the 69)

69 lemans
70 lemans future project.
Correction that should have read 880HP.lol.

Jeff pics coming of Pro street 66 next week.
__________________
"Life is like an engine",it begins full of air and energy,mid way it has a little blow by,at the end it throws a rod.
ANDY MITCHELL is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Andy Mitchell rompn63 Pontiac Business Exchange 94 10-01-12 02:21AM
Andy Mitchell Pontiac 96 Heads Report Johnny406 Grape Vine - General Discussion 10 02-20-09 05:07AM
ANDY MITCHELL question for you Gach Engine Tech Discussion - Street or Strip 8 06-18-08 08:19PM
Andy Mitchell On ESPN Live Gach Engine Tech Discussion - Street or Strip 36 04-20-07 08:27PM
Andy Mitchell Hello-Hello Gach Engine Tech Discussion - Street or Strip 5 02-02-07 05:46PM


All times are GMT -3. The time now is 12:25PM.

Featured Ads
Ken's Speed & Machine
Mayhem Turbocharging

Carter Cryogenics.  What can we freeze for you?

Pacific Performance Racing

Central Virginia Machine Service.  Home of the Injun Engine!

All Pontiac Engine Kits

Larry's Auto Machine.  Full serivce auto, marine machine shop, domestic and foreign.

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
2001 - 2007 PontiacZone.com
Page generated in 0.10819 seconds with 35 queries