Piston suggestions - 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 02-23-2013, 04:52 AM
MalibuMike's Avatar
Registered User
 
Join Date: Mar 2012
Posts: 70
Wiki Edits: 0

Thanks: 19
Thanked 0 Times in 0 Posts
Piston suggestions

Okay guys here we go,when I started my project (1980 2dr Malibu) I "intended" to go with something simple a stock 454 BBC(361959)with (336781) 113cc heads & a cam. Then I found out that if I had it bored .060 I culd make it a 468, next with alil feedback from yu guys I was informed that with 2.19x1.88 valves I culd take my heads up to 119cc. Well with alil research of my own & a performance chart from my69z28.com I've discovered I can take it higher up to a 496 with an addition of a 4.250 crank, mild has slowly turned into wild! I figure I'll go with this set-up & let a real mechanic figure out the best cam that'll work with it best but my question is, goin with this set-up 454 (361959) block, (336781) heads with 2.19x1.88 valves, and a eagle 4.250 cast steel crank if I was to use flat top .060 pistons wuld they be sufficient? If not, why & what kind wuld yu recommend?

(I dnt know any of the compression ratios or how to calculate them)

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-23-2013, 07:01 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,023
Wiki Edits: 0

Thanks: 0
Thanked 24 Times in 24 Posts
The 781 head should be around 120cc.

Installing bigger valves is a good idea, but you should also do some bowl smoothing (under the valve at the head/seat interface) and open up the chambers to the gasket where the bigger valves come closest to the chamber wall. Bigger valves can reduce flow because the big valve gets too close to the chamber wall.

Going with a 496 is also a good idea. I would buy a complete stroker kit. The pistons that come in the kit will have a compression range depending on the head chamber volume. In your case, 120cc.

The compression you choose will depend on what cam you are going to use. And this depends on the gear ratio and stall you plan to use.

If you are using a 3.08 gear and a stock converter, then I would setup the 496 with 8.5:1 cr and use a cam around 218 degrees of duration at 0.05". A flat top piston in a 496 with a 120cc head is around 8.5 cr. A 454 would require a 1/8 inch dome to make this cr with 120cc heads.

If you are using a 4.11 gear and a 10" 3000 stall converter, then I would set up the engine with 10:1 cr and use a cam in the 245 degree range at 0.050".

Be aware that your driveline will need to be upgraded to handle a 496. If you don't plan on upgrading, then stay with a 454, which is still too much for the stock driveline.

What transmission, gear, and stall are you going to use?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-23-2013, 07:29 AM
MalibuMike's Avatar
Registered User
 
Join Date: Mar 2012
Posts: 70
Wiki Edits: 0

Thanks: 19
Thanked 0 Times in 0 Posts
I have a 400 Chevy transmission goin behind it, haven't selected a converter yet. But I plan on putting a 8.5 posi with 3.73 gear. I shuld remind yu guys this isn't intended to be a strip car, jus something for the weekends...
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-23-2013, 08:34 AM
Registered User
 
Last photo:
Join Date: Jan 2011
Location: Hopewell, Va
Age: 62
Posts: 1,234
Wiki Edits: 0

Thanks: 0
Thanked 125 Times in 120 Posts
Piston suggestions

MalibuMike, I would like a little more understanding of the use of the 1980 Malibu. How much of a budget do you plan for the rotating assembly? When you have the block bored be sure to "0" deck it too. It makes setting the quench easier. If you don't want to "0" deck it, check on head gaskets you can get that added to deck clearance = .040. You need to have all the work done to the heads and cc the chambers. You need the chamber size to figure your compression ratio. Are you going with cast parts or forged parts for the rotating assembly, it is up to you.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 02-23-2013, 08:59 AM
Registered User
 
Last photo:
Join Date: Jan 2011
Location: Hopewell, Va
Age: 62
Posts: 1,234
Wiki Edits: 0

Thanks: 0
Thanked 125 Times in 120 Posts
Piston suggestions

Check out a rotating assembly like this one. With the cast iron heads I would not get a rotating assembly with a C.R. of 10.2. You can always mill the heads to 115cc to bring the C.R. up. Scat 1-91505BI BB Chevy 496 Street And Strip Performance Balanced Rotating Assembly - 8.6:1 Icon Flat Top Pistons - BB Chevy 496 Kits - Rotating Assemblies - New | CNC Motorsports | Car Parts | Truck Parts | Competition Engines
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 02-23-2013, 09:34 AM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 8,682
Wiki Edits: 0

Thanks: 367
Thanked 864 Times in 826 Posts
You can also buy a 540 for a reasonable cost.What performance goals do you have?
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 02-23-2013, 11:42 AM
MalibuMike's Avatar
Registered User
 
Join Date: Mar 2012
Posts: 70
Wiki Edits: 0

Thanks: 19
Thanked 0 Times in 0 Posts
Welp, looks like cdminter59 has jus completed the rest of my engine build in one simple post lol thanks guys
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 02-23-2013, 04:56 PM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 8,682
Wiki Edits: 0

Thanks: 367
Thanked 864 Times in 826 Posts
got to love it when someone gets all the right info to you,first try
good luck/have fun and post some pictures for us
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 02-23-2013, 05:26 PM
Registered User
 
Join Date: Nov 2011
Location: Virginia
Posts: 705
Wiki Edits: 0

Thanks: 0
Thanked 75 Times in 75 Posts
Agreed with the kit shown as long as revs are kept "down". We've seen issues with the cast cranks in BBCs when revved above about 6,500. The 4.25" is bad for it. If you're looking to make serious power, spend the extra bucks for a forged crankshaft. We like Eagle, but others have success with Scat, etc. There are American-made BBC cranks, but be prepared ($$).

If a power build, put as long a rod as will "fit" in there. Probably 6.385".

Jim
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 02-23-2013, 07:18 PM
Registered User
 
Last photo:
Join Date: Jan 2011
Location: Hopewell, Va
Age: 62
Posts: 1,234
Wiki Edits: 0

Thanks: 0
Thanked 125 Times in 120 Posts
Quote:
Originally Posted by Mr. P-Body View Post
Agreed with the kit shown as long as revs are kept "down". We've seen issues with the cast cranks in BBCs when revved above about 6,500. The 4.25" is bad for it. If you're looking to make serious power, spend the extra bucks for a forged crankshaft. We like Eagle, but others have success with Scat, etc. There are American-made BBC cranks, but be prepared ($$).

If a power build, put as long a rod as will "fit" in there. Probably 6.385".

Jim
I assumed MalibuMike didn't want to break the bank so I recommended the Scat 9000 cast crank. I like the forged Eagle cranks also. I have purchased two for the 454 in my 67 Camaro over the years. I have the Eagle stroker kit consisting of the 4.250 forged crank, Icon 789 pistons, and the 6.385 Eagle H-Beam rods. I set my shift point at 6500 rpms even with the forged crank.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 02-23-2013, 08:59 PM
MalibuMike's Avatar
Registered User
 
Join Date: Mar 2012
Posts: 70
Wiki Edits: 0

Thanks: 19
Thanked 0 Times in 0 Posts
Yea this was a budget build, wasnt really trying go too extreme but thanks to yu guys I will be able to step it up quite a bit for around the same price range. I'll be sure to post a few pics/vids when it's finished.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 02-24-2013, 06:42 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,023
Wiki Edits: 0

Thanks: 0
Thanked 24 Times in 24 Posts
use this kit.
Eagle 18022L BB Chevy 496 Street and Strip Rotating Assembly - 10.2:1 Mahle Dome Pistons - BB Chevy 496 Kits - Rotating Assemblies - New | CNC Motorsports | Car Parts | Truck Parts | Competition Engines

with the following:
Edelbrock RPM intake
850 holley
headers and 3"dual exhaust
1.72 roller rockers with tall valve covers
Compcam 292H with the proper valve springs
10 inch converter with a 3000 stall
Hei with MSD conversion
6000 rpms should be max.
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:
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
Old TRW Piston Part # 234-98 396 Chevy Forged Piston? heathj1 Engine 1 07-21-2009 06:14 PM
327 piston suggestions. dfgunner Engine 16 04-07-2009 03:39 AM
positioning piston rings on piston geormor9 Engine 5 03-21-2009 06:33 PM
RE:Flat Piston To Domed Piston Bgcooley Engine 10 09-04-2007 01:59 PM
302 piston dim. compared to 327 piston Dave Y. Engine 2 09-25-2002 09:55 AM


All times are GMT -6. The time now is 09:29 AM.


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.