5.4 ?????

voidfinger · Dec 30, 2007

Just looked at that but i think i'm just going to build a motor for CR and a 100/125/150 wet shot. That kit looked cool but can you get the same kit with flat top pistons? What would cost so much more about the overbore? Just wondering...

I like the idea of the valves being unshrouded in the cylender.

What would you recommend for the valve size in the heads? I would like to get some bigger valves to help out with that air flow.

I'm thinking of doing a hand port job on a set of 5.4 Windsor heads I got and get a Custom Ground Cam. The heads need some work but I'm thinking of doing a good valve job with bigger valves, new seals, and whatnot.

Any ideas?

r3dn3ck · Dec 30, 2007

the assembly usually costs about a grand or so for a longblock that's really where the cost comes in. My motor cost about half what you'd pay for the same thing from VT or DSS or MMR. You can request whatever overbore and piston dish you like as long as it's cataloged. I took their probe piston option which cost a couple bucks more.

voidfinger · Dec 30, 2007

whats the difference in the pistons? O and i'd be doing the assembling. I heard its a little harder than the 5.0's but i think i could handle it. Pretty much all i'd need is the machining

r3dn3ck · Dec 30, 2007

Probe don't have any coating and you have to buy the rings. Mahle are phosphate coated and come with rings as part of the piston package. The only reason I got the probes was the Mahle's were backordered for like 6 months at the time for the .020 over sets. If I'd wanted .010 over or std bore or .030 over it would have been no problem but I wanted .020 so I said screw it and went with the probe slugs.

For valves, stock size is fine but IIRC 1.84" is the next size up on the intake side and 1.45" on the exhaust side. Here's an experimental cam grind you can consider. It's specific to 5.4's so DO NOT USE ON A 4.6! 236/250 .510/.550 on 111.5. The low end will suffer a tad but there's still plenty there. The mid-range and top end gain fat under the curve. You'll want that on one of Comp's XE lobes so you get a really fat ramp rate. You'll also need hotter springs than stock. That grind should go completely nuckin futs with a set of longtubes.

voidfinger · Dec 31, 2007

O really, so you did that on your desk top dyno thing? Anyway i could see the graph or whatever? I'd like to see it. I saw some cams from that JohnnyLightning.com and they have like higher lift than that... would you bennifit from higher lift or no? Just wondeing since the stock pi cams have more lift on the intake side than those.. I think its .530/.530 or something like that.

r3dn3ck · Dec 31, 2007

yep. desktop dyno comes with a quick iterator to test cam profiles. That one was for the best HP and TQ area under the curve before 6K rpm. With shortie headers and a HPS intake it should be great, especially with 3.55 gears. The graph is nonsense until you normalize it. It shows flywheel power should exceed 350 and flywheel tq should exceed 400 by just a tick. Keep in mind that cam is for ported heads. If you're not porting them the numbers may change to add higher lift. The trick with cams is finding the combo that has enough lift to flow right but not so much that you lose charge velocity. The exhaust side is heavily biased just for this super-stroker application.

I played around with different lifts and that was the best curve shape with the highest peak HP and TQ numbers for shorties or stock manifolds. It should really show its stuff with a set of longtubes in the mix.

voidfinger · Dec 31, 2007

nice, i might have to get that cam then ! Hope the thing is true then lol.

josh0092002 · Dec 31, 2007

anyone got any before an after pics of the swap? i would love to see some.

r3dn3ck · Jan 1, 2008

my home page...

www.squarerootofone.com

and if you check on mustangboards.com in the 4.6 tech section you'll see a sticky of mine about 5.4 swaps... myillwillinc is a member in there with a pretty good page of his own. There's a few others out there, and there's a couple videos on youtube of a 99 with a 5.4 and a nice nitrous shot doing dyno runs.

voidfinger · Jan 1, 2008

yep thats nice, i saw another thing on there of a lt1 trans am walking it

josh0092002 · Jan 2, 2008

where can i find the new alum intake for the 5.4, an/or the adap plates? an who know when the LTs are coming out. still have trouble finding a block here. if anyone has the links to all that it would be super great, lol thanks again. iam begining to have the feeling this is gonna turn out to be a long term project lol. but at least i can get it done right. lol

r3dn3ck · Jan 2, 2008

josh0092002 said:
where can i find the new alum intake for the 5.4, an/or the adap plates? an who know when the LTs are coming out. still have trouble finding a block here. if anyone has the links to all that it would be super great, lol thanks again. iam begining to have the feeling this is gonna turn out to be a long term project lol. but at least i can get it done right. lol

You can call HiPerforamanceSolutions.com and talk to them. The intake has not been launched yet but from what I'm told we should see it in a matter of weeks. In the meantime, for adapter plates check in over at my thread on mustangboards.com and see if singlesupra still has a set. I'll have a set of adapter plates for sale as soon as the first HPS 5.4 intake comes out. If you're really hard up I might be able to get someone to cut you a set special.

the longtubes are at least 2 months out probably just a hair more. I'm going to the manufacturer late this month to get the prototypes installed. the production headers will be based on my prototype copies. Myillwillinc on my MB thread may be willing to carve up a set from a pair of hooker tubes for you but that'll be probably a few hundred bucks plus the cost of the donor headers.

I've started a forum just for 5.4 power at http://330stangs.s10.forumsplace.com. I'm the admin. I encourage you to sign up there and start a project thread if you're doing a 5.4 swap.

voidfinger · Jan 2, 2008

Man, I'm still bitten with the DOHC bug man... I want a DOHC sooo bad. Is there anyway, to get a 5.4 2v block and put some B heads on them and some adapters with a cobra intake? What would you do about a front cover? Will it fit?

I figure with an 1" adapter on it it wouldn't be tooo bad since the IMRC's are like an inch in diamiter... Plus the extra cubes will help the velocity problem. What would i have to do to make it work and have a 10:1 or 11:1 CR? Thanks man

Jrgunn5150 · Jan 2, 2008

voidfinger said:
Man, I'm still bitten with the DOHC bug man... I want a DOHC sooo bad. Is there anyway, to get a 5.4 2v block and put some B heads on them and some adapters with a cobra intake? What would you do about a front cover? Will it fit?

I figure with an 1" adapter on it it wouldn't be tooo bad since the IMRC's are like an inch in diamiter... Plus the extra cubes will help the velocity problem. What would i have to do to make it work and have a 10:1 or 11:1 CR? Thanks man

The Reichard adapters should work fine for that. I don't see why you couldn't use the stock front cover. Just putting the heads on by themselves should push the CR up to 11:1, since you already have the Mark VIII motor, you already have all the small part's you'd need, except the timing chains.

voidfinger · Jan 2, 2008

Jrgunn5150 said:
voidfinger said:

Man, I'm still bitten with the DOHC bug man... I want a DOHC sooo bad. Is there anyway, to get a 5.4 2v block and put some B heads on them and some adapters with a cobra intake? What would you do about a front cover? Will it fit?

I figure with an 1" adapter on it it wouldn't be tooo bad since the IMRC's are like an inch in diamiter... Plus the extra cubes will help the velocity problem. What would i have to do to make it work and have a 10:1 or 11:1 CR? Thanks man

Click to expand...

The Reichard adapters should work fine for that. I don't see why you couldn't use the stock front cover. Just putting the heads on by themselves should push the CR up to 11:1, since you already have the Mark VIII motor, you already have all the small part's you'd need, except the timing chains.

Reichard plates are for the C head Single ports ... mine are the B head dual ports. The 2v front cover won't work b/c the Dohc heads are wider at the top. O and the Motor got scratched, the dude owed me money and was giving me the motor for collateral... well he disappeared and I haven't seen him in like 6 months. So no motor b/c his land lord took all his stuff for back payments or something. O well, hopefully I'll get it back some how.

Jrgunn5150 · Jan 2, 2008

Lol, nice.

Mesarina · Jan 2, 2008

voidfinger said:
Man, I'm still bitten with the DOHC bug man... I want a DOHC sooo bad. Is there anyway, to get a 5.4 2v block and put some B heads on them and some adapters with a cobra intake? What would you do about a front cover? Will it fit?

I figure with an 1" adapter on it it wouldn't be tooo bad since the IMRC's are like an inch in diamiter... Plus the extra cubes will help the velocity problem. What would i have to do to make it work and have a 10:1 or 11:1 CR? Thanks man

thats what i would like to do, so no one can now that i have a 5.4 instead of a 4.6

but is there a way to be able to rev the 5.4 till 7000rpm like the 4.6?? if i do the swap someday, ill miss reving my cobra like that

voidfinger · Jan 3, 2008

i don't think you can without major modifications. Plus you really don't need to rev it that high anyway. The powerband in the cobra's 4.6 goes to like 6200 or 6500.

Jrgunn5150 · Jan 3, 2008

voidfinger said:
i don't think you can without major modifications. Plus you really don't need to rev it that high anyway. The powerband in the cobra's 4.6 goes to like 6200 or 6500.

My rev limiter is at 6200, but it will slam it pretty hard.

voidfinger · Jan 3, 2008

Jrgunn5150 said:
voidfinger said:

i don't think you can without major modifications. Plus you really don't need to rev it that high anyway. The powerband in the cobra's 4.6 goes to like 6200 or 6500.

Click to expand...

My rev limiter is at 6200, but it will slam it pretty hard.

Its a termi, it slams everything pretty hard lol. I'm saying though that the B heads are good top end heads but i just don't think the cams and stuff work that well at those kinda RPM's