4v heads on a 2v motor?

joshuaw3

Active Member
Joined
Apr 23, 2013
Messages
390
Reaction score
102
Location
Ohio
I have a 98 gt with the stock 4.6 2v in it and I was wondering if I could swap 4v heads on it from 03 Mach 1/ cobra. Will that work or not?
 

96blak54

Legend
Joined
Feb 21, 2011
Messages
8,113
Reaction score
1,339
Location
Ky
Yes it will work! Source the intake, front cover, valve covers for plug wires, fuel rails, cobra alternator(cause a thick old Gt alt wont fit the intake,...its gotta be a thin cobra alt) exhaust logs. Should work real good....now go get it all and swap. We're here to help out, so post lots of questions and post lots of pictures of your swap.
 

joshuaw3

Active Member
Joined
Apr 23, 2013
Messages
390
Reaction score
102
Location
Ohio
Yes it will work! Source the intake, front cover, valve covers for plug wires, fuel rails, cobra alternator(cause a thick old Gt alt wont fit the intake,...its gotta be a thin cobra alt) exhaust logs. Should work real good....now go get it all and swap. We're here to help out, so post lots of questions and post lots of pictures of your swap.

Well here's the thing I found a guy locally who says he has a 4v 93 mark viii motor with 03 navigator heads which are the same as the Mach 1 and cobra heads so should I just get the whole motor and swap it or just do the heads? And where would I get all that stuff you said I need? If I swapped the motor what would I do about the computer do i need a new one or will it work just fine with a tune?
 

96blak54

Legend
Joined
Feb 21, 2011
Messages
8,113
Reaction score
1,339
Location
Ky
The navigator heads are navigator heads ...and the mach1/cobra are cobra heads. If the heads are in fact navigator heads they will still work but will have low torque reproduction compared to any other head, assuming a normal intake will be used.
Sourcing the other parts from junkyards or classifieds works
 

ft_nox

New Member
Joined
May 30, 2007
Messages
66
Reaction score
0
Location
Sebring, FL
Just being nosey.. would he need a new computer or a tune to make the most of the swap? Also, could aftermarket rails be used?
 

96blak54

Legend
Joined
Feb 21, 2011
Messages
8,113
Reaction score
1,339
Location
Ky
Key word here is "most". It'll run with out the tune with all the gt hookups, but to gain the most a dyno tune is a must.
 

96blak54

Legend
Joined
Feb 21, 2011
Messages
8,113
Reaction score
1,339
Location
Ky
Good point. The heads should come along with its original cam timing chains. And your 2v chains will work also
 

03DSGGT

SN95 Supporting Member
Joined
Mar 10, 2011
Messages
723
Reaction score
15
Location
Akron, Ohio
Won't just swapping the heads kill the compression? I thought the 4V cars have -3cc piston dish compared to the NPIs -10.5cc....
 

96blak54

Legend
Joined
Feb 21, 2011
Messages
8,113
Reaction score
1,339
Location
Ky
Youre right, but we was just answering OP question
 

Forum statistics

Threads
75,133
Messages
1,456,287
Members
13,688
Latest member
Pallgor

Members online

Top