4.2 Build

qwiksilvermustang · April 4th, 2011, 09:07 PM

The 4.2 uses the same connecting rods as the 3.8. the difference is the wrist pin height on the piston is higher than on the 3.8 here I'll post a pic of my 4.2 pistons to show ya.

Edit: I cant remember my photobucket info.. the connecting rod length of a 4.2 6.090 same as 3.8. 4.2Compression Height 1.263, 3.8 compression height is 1.607 a difference of .344. the stroke of the 4.2 is 3.74 the 3.8 is 3.39 a difference of .35.

dark_horse · April 4th, 2011, 09:42 PM

got ya, so i can use to the connecting rods, that saves me some $$$...so im guessing ill just need the 4.2 pistons then

so all i need from the 4.2 is...the short block/pistons/crank rite?

qwiksilvermustang · April 4th, 2011, 09:44 PM

Well i'm using my 3.8 block. I think the newer 3.8s and the 4.2s have taller main caps requiring the 01+ oil pan. may need the oil pickup tube as well. You'll need a 01+ Flywheel and Crank Pulley.

Edit: I think the windage tray also makes a difference on using the 01+ oil pan.

dark_horse · April 4th, 2011, 10:06 PM

okay this makes sense now...so basically i just need to put the 4.2 crank/pistons in the 3.8 01-04 motor rite?

well my plan is to get an 01-04 motor and build on that and just keep driving what i have now, then when the build is finished swap out the old in with the new =)

qwiksilvermustang · April 4th, 2011, 10:15 PM

Originally Posted by dark_horse

okay this makes sense now...so basically i just need to put the 4.2 crank/pistons in the 3.8 01-04 motor rite?

well my plan is to get an 01-04 motor and build on that and just keep driving what i have now, then when the build is finished swap out the old in with the new =)

^ well yes as long as you inspect it first,lol. Also have a machine shop remove the counterweight on your asp so that you can keep that. It'd be a really good idea for you to also send the entire rotating assembly to the machine shop just to make sure your balance is good, as well as inspecting the block and making sure the cylinders are'nt out of round. Better to pay a little more now than alot more later. Also have them check the deck height so that you can keep your compression ratio. Im planning a near zero deck with a .010 shave on the heads but then again i already decided not to boost. So I'm looking for a little more N/a where i can get it.

dark_horse · April 4th, 2011, 10:47 PM

alright thanks for the help clearing all this up for me, this makes alot more sense to me now...and one more question, should i assemble the rotating assembly,or should i just let them look at it pieces???

qwiksilvermustang · April 4th, 2011, 10:58 PM

Pieces, let them inspect everything.. If anythings wrong they'll let you know. they'll also weigh everything sep. so that they can calculate the bobweights for checking the balance. Most places usually charge around 225 to balance the assembly.

dark_horse · April 4th, 2011, 11:11 PM

alright, thanks for alot for all the info and letting me know what im getting into...i cant wait to get this project going =) ...been wanting to this for a good while now lol

qwiksilvermustang · April 4th, 2011, 11:18 PM

^good luck and happy modding. I'll do a very through write up when i get home, I realized now i got most of my info from 3.8 and 4.2 tech sheets as well as 3.7 and corral. I typed 4.2 stroker into the search and nothing came up. Suffice it to say i was very surprised.

To the OP, best of luck with your build. I'm sorry that happened to dad and to your build. Keep a good positive outlook and I'm sure everything will work out the best for ya'll.

mustangmike! · April 5th, 2011, 01:22 AM

sorry but yes you do have to switch the oil pick ups over. once I actually pulled them both off they are different

dark_horse · April 5th, 2011, 01:51 AM

quicksilver- thanks again for all the info, was a huge help...i did the same...i tried to see if i could find a write up and nothing O.o lol...and it would be awesome if you do do a write up

mustangmike- so ill use the 4.2 oil pick up rite???

mustangmike! · April 5th, 2011, 02:03 AM

nope, a 3.8
follow exactly what that guide says. Everything seems to be 100% so far.

dark_horse · April 5th, 2011, 02:13 AM

got ya, i was thinking you mint i use the 4.2 lol

mustangmike! · April 5th, 2011, 02:25 AM

nope.

qwiksilvermustang · April 5th, 2011, 10:44 AM

^thanks for clearing that up mike, i was looking for a 4.2 pickup tube. You sir just saved me some cash!!

April 4th, 2011, 09:07 PM	#21
qwiksilvermustang Enthusiast 1999 Mustang Pony Not even currently moving Join Date: Mar 2010 Location: Ft. Bragg Posts: 631 iTrader: 2 reviews	The 4.2 uses the same connecting rods as the 3.8. the difference is the wrist pin height on the piston is higher than on the 3.8 here I'll post a pic of my 4.2 pistons to show ya. Edit: I cant remember my photobucket info.. the connecting rod length of a 4.2 6.090 same as 3.8. 4.2Compression Height 1.263, 3.8 compression height is 1.607 a difference of .344. the stroke of the 4.2 is 3.74 the 3.8 is 3.39 a difference of .35. __________________ lt's,o/r h, flow 40's, egr delete,windstar w/65mm tb,UDP, sniper tuned Need to install: 4.2 crank,.030 silvo's,268hr112 cam,RR's,comp 915's Last edited by qwiksilvermustang; April 6th, 2011 at 10:51 PM.

April 4th, 2011, 09:42 PM	#22
dark_horse Regular 00 3.8 Mustang Slow@slow Join Date: May 2010 Location: Shelbyville, Kentucky Posts: 477 iTrader: 2 reviews	got ya, so i can use to the connecting rods, that saves me some $$$...so im guessing ill just need the 4.2 pistons then so all i need from the 4.2 is...the short block/pistons/crank rite? __________________ Windstar Swap, Asp 25% UDP, Jegs off road h-pipe/Supper 44's, Tri hook Quadrant

April 4th, 2011, 09:44 PM	#23
qwiksilvermustang Enthusiast 1999 Mustang Pony Not even currently moving Join Date: Mar 2010 Location: Ft. Bragg Posts: 631 iTrader: 2 reviews	Well i'm using my 3.8 block. I think the newer 3.8s and the 4.2s have taller main caps requiring the 01+ oil pan. may need the oil pickup tube as well. You'll need a 01+ Flywheel and Crank Pulley. Edit: I think the windage tray also makes a difference on using the 01+ oil pan. __________________ lt's,o/r h, flow 40's, egr delete,windstar w/65mm tb,UDP, sniper tuned Need to install: 4.2 crank,.030 silvo's,268hr112 cam,RR's,comp 915's Last edited by qwiksilvermustang; April 4th, 2011 at 09:53 PM.

April 4th, 2011, 10:06 PM	#24
dark_horse Regular 00 3.8 Mustang Slow@slow Join Date: May 2010 Location: Shelbyville, Kentucky Posts: 477 iTrader: 2 reviews	okay this makes sense now...so basically i just need to put the 4.2 crank/pistons in the 3.8 01-04 motor rite? well my plan is to get an 01-04 motor and build on that and just keep driving what i have now, then when the build is finished swap out the old in with the new =) __________________ Windstar Swap, Asp 25% UDP, Jegs off road h-pipe/Supper 44's, Tri hook Quadrant

April 4th, 2011, 10:47 PM	#26
dark_horse Regular 00 3.8 Mustang Slow@slow Join Date: May 2010 Location: Shelbyville, Kentucky Posts: 477 iTrader: 2 reviews	alright thanks for the help clearing all this up for me, this makes alot more sense to me now...and one more question, should i assemble the rotating assembly,or should i just let them look at it pieces??? __________________ Windstar Swap, Asp 25% UDP, Jegs off road h-pipe/Supper 44's, Tri hook Quadrant

April 4th, 2011, 10:58 PM	#27
qwiksilvermustang Enthusiast 1999 Mustang Pony Not even currently moving Join Date: Mar 2010 Location: Ft. Bragg Posts: 631 iTrader: 2 reviews	Pieces, let them inspect everything.. If anythings wrong they'll let you know. they'll also weigh everything sep. so that they can calculate the bobweights for checking the balance. Most places usually charge around 225 to balance the assembly. __________________ lt's,o/r h, flow 40's, egr delete,windstar w/65mm tb,UDP, sniper tuned Need to install: 4.2 crank,.030 silvo's,268hr112 cam,RR's,comp 915's

April 4th, 2011, 11:11 PM	#28
dark_horse Regular 00 3.8 Mustang Slow@slow Join Date: May 2010 Location: Shelbyville, Kentucky Posts: 477 iTrader: 2 reviews	alright, thanks for alot for all the info and letting me know what im getting into...i cant wait to get this project going =) ...been wanting to this for a good while now lol __________________ Windstar Swap, Asp 25% UDP, Jegs off road h-pipe/Supper 44's, Tri hook Quadrant

April 4th, 2011, 11:18 PM	#29
qwiksilvermustang Enthusiast 1999 Mustang Pony Not even currently moving Join Date: Mar 2010 Location: Ft. Bragg Posts: 631 iTrader: 2 reviews	^good luck and happy modding. I'll do a very through write up when i get home, I realized now i got most of my info from 3.8 and 4.2 tech sheets as well as 3.7 and corral. I typed 4.2 stroker into the search and nothing came up. Suffice it to say i was very surprised. To the OP, best of luck with your build. I'm sorry that happened to dad and to your build. Keep a good positive outlook and I'm sure everything will work out the best for ya'll. __________________ lt's,o/r h, flow 40's, egr delete,windstar w/65mm tb,UDP, sniper tuned Need to install: 4.2 crank,.030 silvo's,268hr112 cam,RR's,comp 915's

April 5th, 2011, 01:22 AM	#30
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	sorry but yes you do have to switch the oil pick ups over. once I actually pulled them both off they are different __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

April 5th, 2011, 01:51 AM	#31
dark_horse Regular 00 3.8 Mustang Slow@slow Join Date: May 2010 Location: Shelbyville, Kentucky Posts: 477 iTrader: 2 reviews	quicksilver- thanks again for all the info, was a huge help...i did the same...i tried to see if i could find a write up and nothing O.o lol...and it would be awesome if you do do a write up mustangmike- so ill use the 4.2 oil pick up rite??? __________________ Windstar Swap, Asp 25% UDP, Jegs off road h-pipe/Supper 44's, Tri hook Quadrant

April 5th, 2011, 02:03 AM	#32
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	nope, a 3.8 follow exactly what that guide says. Everything seems to be 100% so far. __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

April 5th, 2011, 02:13 AM	#33
dark_horse Regular 00 3.8 Mustang Slow@slow Join Date: May 2010 Location: Shelbyville, Kentucky Posts: 477 iTrader: 2 reviews	got ya, i was thinking you mint i use the 4.2 lol __________________ Windstar Swap, Asp 25% UDP, Jegs off road h-pipe/Supper 44's, Tri hook Quadrant

April 5th, 2011, 02:25 AM	#34
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	nope. __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

April 5th, 2011, 10:44 AM	#35
qwiksilvermustang Enthusiast 1999 Mustang Pony Not even currently moving Join Date: Mar 2010 Location: Ft. Bragg Posts: 631 iTrader: 2 reviews	^thanks for clearing that up mike, i was looking for a 4.2 pickup tube. You sir just saved me some cash!! __________________ lt's,o/r h, flow 40's, egr delete,windstar w/65mm tb,UDP, sniper tuned Need to install: 4.2 crank,.030 silvo's,268hr112 cam,RR's,comp 915's

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

Threads Similar to: 4.2 Build
Thread	Thread Starter	Forum	Replies	Last Post
New Build For The 98 Gt	tyler1987	96-98	26	June 15th, 2010 08:19 PM
V6 build up	rebcavstang	V6 Mustangs	9	July 19th, 2009 11:35 PM
5.0 Build	RIDIN5.0	5.0 Mustangs	22	March 22nd, 2009 05:17 PM
408 build	Iownastang	5.0 Mustangs	49	October 14th, 2007 10:09 PM

All times are GMT -4. The time now is 10:52 PM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.