2. DOUG S HEADERS
  3. D3358
D3358

DOUG S HEADERS D3358 User manual

  • Hello! I've reviewed the installation instructions for Doug's Headers D3358, designed for 1970-81 Camaro LS engine swaps. This document provides detailed steps for disassembly and installation, compatibility notes, and required parts. I'm ready to answer your questions about the header installation process or related components.
  • What motor mounts are these headers designed to work with?
    Will these headers work with a factory column shifter?
    What transmissions are compatible with these headers?
Installation Instructions & Warranty Information
D3358 ~ 1970-81 Camaro, LS Engine Swap Mid Length Headers
REV. 1 11-30-21 DSL
Notes:
1. TheseheadersaredesignedspecicallytoworkwithDoug’sEngineSwapmotormount
 brackets#SK103.Wecannotguarantytwithanyotherbrand.
2. Willnotworkwithfactorycolumnshifters.Ifusingacolumnshiftautomaticyouwill
 needtofabricatelinkageoruseacableconversionkit.Ifusingamanualtranswe
 recommendaoorshifterandhydraulicclutchconversion.
3. Doug’sD3358aredesignedtobeusedwithmostGMautomatictransmissions 
aswellasT56andT56Magnumstickshift.SeeDoug’stransmissioncrossmember
 #SKC1021formoreinformation.
4. Doug’soersabolton3”Exhaustsystemforthisheaderapplication,part#DES104
 andmidpipesDMP104,DMP105toconnecttheheaderstotheexhaustsystem.
5. AngleBootSparkPlugwiresarerequiredwiththeseheadersWerecommendPerTronix
 CeramicBootwires#808224HTor828224HT.
DISASSEMBLY
1. WerecommendthattheDoug’smotormountsandtranscrossmemberinstallationare
 nishedbeforeattemptingtoinstalltheheader.Disconnectthenegativebatterycable
 fromthebattery.
2. Ifacarliftisnotavailable,raisethevehicle2feetorhigherandsupportitwith 
 adequatesafetystands.Makesurethevehicleisonaatsolidsurfaceandisstable.
3. Removethesparkplugwiresandplugs,thentheOildipstickandtube.
4. Ifthemotorhasexistingmanifolds,removethem,andcleanthematingsurfaceonthe
 cylinderheads.
INSTALLATION
1. Applyadabofanti-seizetothesuppliedheaderbolts.
2. Startingwithpassengerside,sliptheheaderinplaceworkingfromaboveandholdin
 placewith1headerbolt.
3. Fromabovesliptheheadergasketinplaceandthenstarttheremainderiftheheader
 boltsandlockwashers.
4. Tightenallheaderboltsevenlyworkingfromthecenterout.
5. SliptheDriver’ssideheaderintoplacefromabove.Aswiththepassengerside,install
 thegasketandalltheheaderbolts,tighteningfromthecenterout.
6. Reinstallthedipsticktube,sparkplugsandwires.
7. IfusingtheDoug’sMidPipes#DMP104,DMP105,slipthemontothecollectors,butdo
 nottightentheclampsuntilyoudotheexhaustinstallation.Installyour02-sensors,use
 adabofAntiSeizebeingcarefultonotgetanyonthe02-sensorprobe.
9. InstalltheDoug’sExhaustsystemtocompletetheinstallation.
PARTS LIST:
1 Left side header 1 Right side header
2 Header gasket 12 Header bolts M8-1.25 x 25MM (1” long)
12 Lock washer, 3/8”
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