Building the Vortec 357ci - Hot Rod Forum : Hotrodders Bulletin Board -- 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
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 08-20-2008, 07:58 AM
04SilveradoMykk's Avatar
Registered User
Last photo:
Join Date: Jul 2008
Location: Prescott, AZ
Posts: 156
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Building the Vortec 357ci

Hello Everyone,

You've been such great help here while building my S.B.C. Every hurdle I've had to jump has been with great help & support from

So here this is what I have been up to:

Started with a 86-95 4 bolt main block, one piece rear, roller cam block

Honed it out to new H345NCP-40 pistons.

Balanced a take-out forged ZZ4 crank & rods with a new balancer & dampener

Stabbed in a LT4 Hot Cam

cleaned up a pair of Vortec 906 heads. Drilled out the pushrod holes to 1/2", Bowl Hawged the intake & exhaust, gasket matched the intake ports & intake manifold, pinned all 16 press in studs and cleaned up the rough castings in the exhaust ports.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 08-20-2008, 07:59 AM
04SilveradoMykk's Avatar
Registered User
Last photo:
Join Date: Jul 2008
Location: Prescott, AZ
Posts: 156
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Sneaked a Summit quiet geardrive and the crank position sensor reluctor wheel behind the plastic vortec timing cover.

Assembled the heads with new 1.94" / 1.5" swirl polished valves. Comp Beehive springs & Proform 1.6 ratio roller rockers

Droping in the new Updated Vortec fuel injection spider

bored the vortec upper plenum from 72mm to 74.4mm to match the larger CFM-Tech throttlebody

Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-20-2008, 08:00 AM
04SilveradoMykk's Avatar
Registered User
Last photo:
Join Date: Jul 2008
Location: Prescott, AZ
Posts: 156
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Welded a pair of O2 sensor bungs to the Hooker Headers 2462 long tubes

Put on the rear main seal retainer & oil pan and there she is... my S.B.C.

She's not 100%, as soon as it's off the stand I can tap in the remaining two expansion plugs & cam plug.

This pic was a mock up before the final assembly, but gives an idea of what she'd look like. Thus the lack of bolts.

Best of all, it rotates freely... no binding up, no PTV issues,no coil bind, no retainer to valve seal interferance, no geardrive & CKPS reluctor interferance.

Specs are:

357ci: 4.040" bore x 3.480" stroke, 5.7" rods

Hypereutectic Aluminum flat top ( 4 valve relief) pistons sit .004" in the hole, with Felpro 7733pt head gasket (.039" compressed) will have a .043" quench height.

Estimated 10.2-1 static compression ratio.

Valvetrain: LT4 Hot Cam, 1.6 rockers
Lift @ .050":.525" I / .525" E
Dur @ .050" 218 I / 228 E
112* lobe seperation, 108* intake centerline

To help this valvetrain function in a 4380lb pickup here is a 3000 stall locking torque converter for the 4L60E

Desktop Dyno puts this motor @
396HP @5500rpm
421ft-lbs TQ @ 4000rpm

..but I also have my single fogger 75 shot of wet nitrous.

Carcraft did a build using the same block, heads & valvetrain and came to:
401HP @ 5600rpm
428ft-lbs TQ @ 4200rpm

The only differences were they were carburated & stock bore & less compression than mine. So we'll see what happens.

Cheers ~Mykk

Last edited by 04SilveradoMykk; 08-20-2008 at 08:20 AM.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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
Vortec Engine Swap Problems 5700 350 capps Engine 22 01-28-2016 12:06 AM
VORTEC Intake manifold gasket questions Rattpac Engine 7 02-23-2011 02:12 PM
305 vortec heads vs 350 vortec rimracers Engine 6 04-02-2007 08:41 PM
Motorheads...Need help with Vortec style heads, can they just be swapped? firstgear Engine 16 01-15-2007 12:02 AM
a question about vortec 454s notmrgoodwrench Engine 4 02-23-2003 08:02 AM

All times are GMT -6. The time now is 12:33 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.