[screwd4vgt]

yea dont bother rebuilding go mmr with boost or if your on a budget 5.4 or 4v all depends on how deep your pockets are and how fast you wanna go

[that.damn.deigo]

anyone know what kinda numbers people are getting on the 4.75 mmr block? is it worth it to go that route with head work an cams or just 4v?

[that.damn.deigo]

Originally Posted by screwd4vgt yea dont bother rebuilding go mmr with boost or if your on a budget 5.4 or 4v all depends on how deep your pockets are and how fast you wanna go

haha. im sure like most on here, too fast just isnt fast enough.. its gonna be a slow build though, so i dont have to do a pieced together budget build. do it right the first time kinda thing ya know? lol

[that.damn.deigo]

Originally Posted by that.damn.deigo anyone know what kinda numbers people are getting on the 4.75 mmr block? is it worth it to go that route with head work an cams or just 4v?

[Eagle2000GT]

Originally Posted by that.damn.deigo anyone know what kinda numbers people are getting on the 4.75 mmr block? is it worth it to go that route with head work an cams or just 4v?

That depends entirely upon the options you choose. If you go with stock compression you should make slightly higher numbers than the stock 4.6 because its a 290 ci motor instead of a 281 ci motor. If you go with a high compression ratio, ported heads and cams you will be in the 300-320 rwhp range. If you go low compression ratio planning on FI later then you will make less horsepower n/a than your stock motor. Forged parts don't really increase the horsepower. But they do hold together better in high horsepower applications.

[that.damn.deigo]

Originally Posted by Eagle2000GT That depends entirely upon the options you choose. If you go with stock compression you should make slightly higher numbers than the stock 4.6 because its a 290 ci motor instead of a 281 ci motor. If you go with a high compression ratio, ported heads and cams you will be in the 300-320 rwhp range. If you go low compression ratio planning on FI later then you will make less horsepower n/a than your stock motor. Forged parts don't really increase the horsepower. But they do hold together better in high horsepower applications.

i plan on going FI in the future, as far as compression i heard different views on going low or stock compression. obviously wouldnt go high but is it that much better to go low compression? and my head work will include a port with a nice set of cams. i was hopin to hit the 300 mark before i went fi. possible at all?

[dhicks7806]

Originally Posted by that.damn.deigo i plan on going FI in the future, as far as compression i heard different views on going low or stock compression. obviously wouldnt go high but is it that much better to go low compression? and my head work will include a port with a nice set of cams. i was hopin to hit the 300 mark before i went fi. possible at all?

It depends how much boost you plan on running. Typically you want low compression with high boost but I would say stock compression is fine for low boost like 10psi or less but I have heard of people running as high as 18psi at 10:1 CR with success.


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