Need Advice on HP - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-11-2006, 08:54 AM
rac43's Avatar
Registered User
 
Last photo:
Join Date: Jun 2006
Location: Dallas Texas
Posts: 73
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Need Advice on HP

I know there have been a lot of post about "How Much HP DO I Have" so here I am. This 350 is in a 23 T-Bucket and can anyone help me with what the crank HP may be? Major engine rebuild done!

76 350, 2 bolt main
Pistons,forged flat top .030" Speed-Pro with moly rings
882 Chevy heads with 2.02 intakes and 1.625 exhaust valves.
Cam, 222/222 at 0.50 GM 3896962 Hyd. Flat Tappet
HEI ignition
69 Corvette crank, ground .10 both rods and mains
Edelbrock TM-1 intake, single plane, Edelbrock 650 Thunder square bore
Built turbo 350, 2800 stall, and 3:73 gears

    Advertisement

Last edited by rac43; 07-11-2006 at 08:59 AM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-11-2006, 09:34 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,021
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
300hp to 325hp

go to http://www.ryanscarpage.50megs.com/combos1.html. And then go to combo 72 and 82, which are most like your engine.

The 882 heads and soft ramp cam is holding your engine back.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-11-2006, 10:30 AM
RHamm1320's Avatar
Member
 
Last wiki edit: Computer dyno simulation and engine building softw... Last photo:
Join Date: Nov 2001
Location: St Louis, MO
Posts: 91
Wiki Edits: 3

Thanks: 0
Thanked 0 Times in 0 Posts
A dual plane intake would really help alot. Your intake is wanting upper rpm horsepower and fighting the rest of your engine that wants to make torque.

http://www.nastyz28.com/sbchevy/sbccams.html

http://www.virtualengine2000.com



Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-11-2006, 10:38 AM
firestone's Avatar
http://teamrfc.gospelcom.net
 
Last photo:
Join Date: Nov 2003
Location: Fenton MI
Age: 32
Posts: 1,743
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I agree with the 300-325 estimate.

Adam
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-11-2006, 12:36 PM
rac43's Avatar
Registered User
 
Last photo:
Join Date: Jun 2006
Location: Dallas Texas
Posts: 73
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Thanks for the replies so far and I really would appreciate your advice on how to get this 350 up to about 370-400HP. Can I do it by changing my intake and if so, please advise a good dual plane to use for min $. Do you think I get it up another 50-70HP this way or would I have to change cam? This cam is the same one used in the 69-70 350/350HP LT46 vett. Any advice would be appreciated.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-11-2006, 01:43 PM
firestone's Avatar
http://teamrfc.gospelcom.net
 
Last photo:
Join Date: Nov 2003
Location: Fenton MI
Age: 32
Posts: 1,743
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Pretty much the only way to make it have 370-400 hp and keep it streetable is to get a new set of heads. A new cam will help, but will not add that much. The dual plane intake will probably not add to the max power, but will creat more power on the low end. I think you are closer to ~300 right now. an XE274H (230 236 @.050 .490 lift) cam would probably take you to around 330. As far as which intake to switch to, I would recommend the performer RPM for $132 from Jegs.

Intake manifold: $132
http://www.jegs.com/webapp/wcs/store...tegoryId=11937

Cam: $175 (with lifters)
http://www.jegs.com/webapp/wcs/store...chItemId=29331

Adam

Last edited by firestone; 07-11-2006 at 01:48 PM.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 07-11-2006, 01:51 PM
Registered User
 
Last photo:
Join Date: Nov 2004
Location: Cali
Posts: 994
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by rac43
Thanks for the replies so far and I really would appreciate your advice on how to get this 350 up to about 370-400HP. Can I do it by changing my intake and if so, please advise a good dual plane to use for min $. Do you think I get it up another 50-70HP this way or would I have to change cam? This cam is the same one used in the 69-70 350/350HP LT46 vett. Any advice would be appreciated.
There's more power to be made with a well designed exhaust system than with a manifold change. I see you haven't described yours.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 07-11-2006, 01:52 PM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,021
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
I would go with the Edelbrock Performer head (1000.00) and Edelbrock Performer RPM intake (180.00).

You have enough gear and stall to run a pretty big cam.


With the Edelbrock RPM heads and a modern cam grind with around 230 degrees of duration at 0.050" will get you past 400hp mark fairly easily.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 07-11-2006, 02:05 PM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,021
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
Go to
http://chevyhiperformance.com/tech/e...est/index.html

They dyno'd 8 cylinder heads that cost under 1000.00 with a 383 and a XE274H compcam. Go down to the bottom of the page and check out page 3. The Edelbrock RPM heads made the most average power a had a peak output of 452hp and 491 ftlbs of torque. Of course, a 355 will make about 8% less in torque and hp as compared to a 383. So a similar built 350 would make around, 415 hp and 450 ftlbs of torque.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 07-11-2006, 04:42 PM
rac43's Avatar
Registered User
 
Last photo:
Join Date: Jun 2006
Location: Dallas Texas
Posts: 73
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by onovakind67
There's more power to be made with a well designed exhaust system than with a manifold change. I see you haven't described yours.
I have custom made headers leading to a 3 1/2 inch collector dumping out of the sides. NO mufflers! Could not be more free flowing!
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 07-12-2006, 09:48 AM
rac43's Avatar
Registered User
 
Last photo:
Join Date: Jun 2006
Location: Dallas Texas
Posts: 73
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Lots of great info above and my thanks. I am getting a Edelbrock RPM later this week to start with and will start looking for heads and a cam. Cam advise would be appreciated. I want to stay streetable and keep my compression to under 10-1 for street gas. From what I read above, a lot of you think my 882 heads are not up to getting up over 350HP, even with 2.02 intakes and 1.625 exhaust. Right???
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 07-12-2006, 11:42 AM
65 Imp SS's Avatar
Member
 
Last photo:
Join Date: Sep 2003
Location: central MN
Posts: 207
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
rac43 go to this web:
http://www.chevyhiperformance.com/techarticles/41598/
Then scan down to the sidebar articles and go to category 1 small block your head flow rating is there. Also there is a number of other flow ratings for s.b and b.b. chevy heads.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 07-12-2006, 01:47 PM
Registered User
 
Last photo:
Join Date: Nov 2004
Location: Cali
Posts: 994
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by rac43
I have custom made headers leading to a 3 1/2 inch collector dumping out of the sides. NO mufflers! Could not be more free flowing!
One of the largest errors street enthusiasts make is in running too large of a primary pipe, and too large of a collector. For example, NHRA and IHRA Stock teams using Burns' headers in H/SA in traditional small-block powered musclecars are running 1.5-inch diameter primary pipes- much smaller than many street machines are trying to use.

http://www.popularhotrodding.com/tech/0310phr_burns/

There's a difference between 'free-flowing' and 'properly designed'. If free flowing was the solution, you'd see everyone just blowing the exhaust out of the head. For a 350" motor, something in the 1.5" x 40" primary range and a 2-1/2" collector would work well. A 3-1/2" collector is way too large to do any serious scavenging at your operating rpm's.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 07-12-2006, 03:31 PM
rac43's Avatar
Registered User
 
Last photo:
Join Date: Jun 2006
Location: Dallas Texas
Posts: 73
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Here is a photo of my T-Bucket with the 350. It now does 0-60 in 4 secs flat so I think the 3 1/2" collecter is working perfectly, don't you! Thanks for the advise on the exaust!
Attached Thumbnails
Click image for larger version

Name:	Aa 5-24-6.JPG
Views:	65
Size:	167.7 KB
ID:	13335  

Last edited by rac43; 07-12-2006 at 05:32 PM.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 07-12-2006, 06:35 PM
Registered User
 
Last photo:
Join Date: Nov 2004
Location: Cali
Posts: 994
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by rac43
Here is a photo of my T-Bucket with the 350. It now does 0-60 in 4 secs flat so I think the 3 1/2" collecter is working perfectly, don't you! Thanks for the advise on the exaust!

No, I don't think they're working perfectly. They look pretty good, but the design is from the sixties. My 3450# daily driver Nova ran 0-60 in about 3.2 seconds with 1-5/8" headers, 2-1/2" collectors and full mufflers. I'll bet you could easily knock 1/2 a second off your 0-60 time with a properly scavenging merge collector.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Increasing HP on my Blown SBC with Cylinder Head Replacement 1950bulletnose Engine 5 03-04-2004 11:00 AM
68 Camaro engine advice Valkadesh Engine 2 01-11-2004 09:12 AM
what was the strongest year 350 stock from gm??? joe28boxer Engine 24 12-17-2003 11:21 PM
hp, torque, tranny, gear setup for '32 'glass roadster McDeuce Engine 0 10-08-2003 09:39 PM
A few changes to 540 hp carcraft buildup... what kind of hp loss? guesstimates please elukas Engine 16 08-07-2003 07:54 PM


All times are GMT -6. The time now is 03:46 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.