Going into my 4.6 soon

Duane'97gt2v · 02-23-2005, 10:29 AM

I plan on getting into my 4.6 pretty soon, runs perfect though. No oil is leaking or burning. I'm going to add "PI" heads and intake, upper plenium, cold air, throttle body and headers. Should I go ahead and pull the whole block out and have it cleaned and replace the stock componets w/new? I feel I should add forged pistons also 'cause have future plans (1 yr. or so)of adding roots style supercharger, or should I just leave the bottom-end alone despite having 101,000 miles of no problems on it? Which headers should I go with '96-'98 or '99 up? I'm pretty sure '99 and up due to "PI" heads, but not certain, and what throttle body size, want to run BBK but not sure on size. I found a forged pistons rebuild kit in Summit for a little under $800.00, and pulling the block and replacing the bottom-end could seriously be felt on my budget and extended garage time( even with help of friends) any replys will be appreciated. Oh yeah, has anyone else ever broke into one of these mod motors? I hear it's rather time consuming and a head-ache.

Orange97GTVert · 02-23-2005, 07:04 PM

I think if I was going to start moddin' a 4.6 with 101K miles I would go ahead and go through the block while I was at it. It may run perfect now, but go adding horsepower and possibly a heavy foot and who knows how long it will be before you have to go back into it. Go ahead and build the bottom end now so it can handle the mods you have planned for it.

302mazda · 02-24-2005, 01:10 AM

Quote:

Originally Posted by Orange97GTVert

I think if I was going to start moddin' a 4.6 with 101K miles I would go ahead and go through the block while I was at it. It may run perfect now, but go adding horsepower and possibly a heavy foot and who knows how long it will be before you have to go back into it. Go ahead and build the bottom end now so it can handle the mods you have planned for it.

he has already add the heavy foot part lol

Red Mustang Gt 46 · 02-27-2005, 07:37 AM

With 110 on the odometer, it would be wise to rebuild the entire block. In my experience (w/ fleet Crown Vics) 100,000 + miles gets close to the compression ring failure area. It is not to say that you would experience failure, you just run the risk...

surfbeast · 02-27-2005, 08:28 PM

Pull and replace or just buy a good used low milage 4.6. In good shape it can handle boost and you may save money on all the labor and trouble involved in rebuilding and old NPI block.

Duane'97gt2v · 02-28-2005, 08:25 AM

Thanks guys, I appreciate the replys and advice!!!

02-23-2005, 10:29 AM	#1
Duane'97gt2v Registered Member Join Date: Feb 2005 Posts: 20	Going into my 4.6 soon I plan on getting into my 4.6 pretty soon, runs perfect though. No oil is leaking or burning. I'm going to add "PI" heads and intake, upper plenium, cold air, throttle body and headers. Should I go ahead and pull the whole block out and have it cleaned and replace the stock componets w/new? I feel I should add forged pistons also 'cause have future plans (1 yr. or so)of adding roots style supercharger, or should I just leave the bottom-end alone despite having 101,000 miles of no problems on it? Which headers should I go with '96-'98 or '99 up? I'm pretty sure '99 and up due to "PI" heads, but not certain, and what throttle body size, want to run BBK but not sure on size. I found a forged pistons rebuild kit in Summit for a little under $800.00, and pulling the block and replacing the bottom-end could seriously be felt on my budget and extended garage time( even with help of friends) any replys will be appreciated. Oh yeah, has anyone else ever broke into one of these mod motors? I hear it's rather time consuming and a head-ache.

02-23-2005, 07:04 PM	#2
Orange97GTVert Mustang Fanatic Join Date: Dec 2003 Location: Tyler, TX Posts: 568	Re: Going into my 4.6 soon I think if I was going to start moddin' a 4.6 with 101K miles I would go ahead and go through the block while I was at it. It may run perfect now, but go adding horsepower and possibly a heavy foot and who knows how long it will be before you have to go back into it. Go ahead and build the bottom end now so it can handle the mods you have planned for it. __________________ Harold Phillips www.mustangsofeasttexas.org 1997 Mustang GT Convertible, 4.6L Auto, Autumn Orange w/Saddle Tan Top & Leather Interior, Styling Bar, 17 X 9 Polished Cobra R's on Nitto NT 555's, Ford Racing Bullitt Suspension package, Mac CAI, Steeda UDP's, Flowmaster 40 Series Catback, SCT X-Calibrator II, Zaino Shine, 7 time Show Winner, driven daily

02-27-2005, 07:37 AM	#4
Red Mustang Gt 46 13.3 @ 103 Join Date: May 2001 Location: Maryland Posts: 253	Re: Going into my 4.6 soon With 110 on the odometer, it would be wise to rebuild the entire block. In my experience (w/ fleet Crown Vics) 100,000 + miles gets close to the compression ring failure area. It is not to say that you would experience failure, you just run the risk... __________________ Equipment by: Steeda C&L COMP CAMS FRPP MSD Bassani Magnaflow MAC

02-27-2005, 08:28 PM	#5
surfbeast Registered Member Join Date: Feb 2002 Location: Maryville,TN Posts: 415	Re: Going into my 4.6 soon Pull and replace or just buy a good used low milage 4.6. In good shape it can handle boost and you may save money on all the labor and trouble involved in rebuilding and old NPI block. __________________ 98 GT / convertable -98 Saleen engine, Saleen appearance pkg. SHM cams,P&P NPI heads, and so much more!

02-28-2005, 08:25 AM	#6
Duane'97gt2v Registered Member Join Date: Feb 2005 Posts: 20	Re: Going into my 4.6 soon Thanks guys, I appreciate the replys and advice!!!