Organized Drag Racing and Autocross Drag racing and autocross discussions and questions. Techniques, tips, suggestions, and "what will I run?" questions.

Rocker Arms

Thread Tools
 
Search this Thread
 
Old Feb 18, 2008 | 10:44 AM
  #1  
85Firebird350's Avatar
Thread Starter
Senior Member
iTrader: (3)
 
Joined: Sep 2006
Posts: 629
Likes: 1
From: Worcester
Car: 1984 Firebird T/A
Engine: 406sbc
Transmission: TH400
Axle/Gears: Moser 9"
Rocker Arms

I just got some new heads and I have a few questions. I know the heads are 7/16 studs But will stock stamped rockers from my 882 heads fit them?

What would you guys recommend? What do you guys think of these?
http://store.summitracing.com/partde...B&autoview=sku

Cam specs are.. .586/.562 238/248*@.050 113 LSA btdc= 5 abdc=51 bbdc=57 atdc=11

I went with the 1.5/1.6 combo to boost the lift on the exhaust side, new lift would be .586/.599, can any of you give me some help?
Reply
Old Feb 18, 2008 | 11:38 AM
  #2  
mw66nova's Avatar
Supreme Member
20 Year Member
iTrader: (13)
 
Joined: Jun 2002
Posts: 13,576
Likes: 30
From: Harford County, MD
Car: camaro sportcoupe
Engine: 7.0L
Transmission: G-Force GF5R
Axle/Gears: Moser 9"
Re: Rocker Arms

no, and with that cam, i'd never think to use stock rockers. comp pro-magnums will be the ticket for your combo
Reply
Old Feb 18, 2008 | 12:36 PM
  #3  
AlkyIROC's Avatar
Moderator
25 Year Member
Liked
 
Joined: Jul 1999
Posts: 17,268
Likes: 170
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Rocker Arms

Stamped steel rockers unless they're long slot rockers are not good for very much beyond stock lift. Exhaust normally doesn't need much of an increase. The piston traveling up the cylinder will push the exhaust gases out just as easily but velocity will be lower with more lift. That's why exhaust lift is normally less than intake lift.

Comp Pro Magnums. SBC version with 7/16" stud.
Set of 16
http://www.jegs.com/webapp/wcs/store...10002_33020_-1

Set of 8
http://www.jegs.com/webapp/wcs/store...10002_64362_-1

There's more to it than just a rocker arm swap. Going to that much lift you also need to check a lot of clearances.

Will the spring pressure handle that much lift and will they bind with that much lift?
Will the bottom of the retainer hit the top of the valve guide with that much lift?
Will the valves hit the pistons?
How is the valve train geometry?
Reply
Old Feb 18, 2008 | 05:20 PM
  #4  
85Firebird350's Avatar
Thread Starter
Senior Member
iTrader: (3)
 
Joined: Sep 2006
Posts: 629
Likes: 1
From: Worcester
Car: 1984 Firebird T/A
Engine: 406sbc
Transmission: TH400
Axle/Gears: Moser 9"
Re: Rocker Arms

The whole top end is off my buddys 383 stroker that put down some very stout numbers. They are world sportsman 2's fully setup for that hyd. roller cam. The only thing I need to worry about is P/V clearance. Other than that I know the cam, lifters, pushrods and heads all work together great.
Reply
Old Mar 4, 2008 | 11:16 AM
  #5  
85Firebird350's Avatar
Thread Starter
Senior Member
iTrader: (3)
 
Joined: Sep 2006
Posts: 629
Likes: 1
From: Worcester
Car: 1984 Firebird T/A
Engine: 406sbc
Transmission: TH400
Axle/Gears: Moser 9"
Re: Rocker Arms

Can I go with aluminum rockers or should I stick with steel since my springs have 500+ lbs of pressure?
Reply
Old Mar 4, 2008 | 06:04 PM
  #6  
AlkyIROC's Avatar
Moderator
25 Year Member
Liked
 
Joined: Jul 1999
Posts: 17,268
Likes: 170
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Rocker Arms

I broke a trunnion on a Crane Gold. Use the Pro Magnums.
Reply
Old Mar 4, 2008 | 09:30 PM
  #7  
85Firebird350's Avatar
Thread Starter
Senior Member
iTrader: (3)
 
Joined: Sep 2006
Posts: 629
Likes: 1
From: Worcester
Car: 1984 Firebird T/A
Engine: 406sbc
Transmission: TH400
Axle/Gears: Moser 9"
Re: Rocker Arms

Thats what I thought, thank you sir.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Ed1LE
Suspension and Chassis
8
Sep 30, 2018 09:14 AM
92rsvortec350
Engine/Drivetrain/Suspension Parts for Sale
19
Oct 9, 2015 09:39 AM
loud91rs
Camaros for Sale
7
Oct 5, 2015 10:05 PM
meeklay812
Camaros for Sale
1
Oct 1, 2015 03:46 PM
1HotZ28&SS
Suspension and Chassis
3
Sep 28, 2015 08:58 PM




All times are GMT -5. The time now is 07:04 PM.