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 Post subject: boss heads
Posted: Tue Nov 11, 2008 2:06 am 
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Hi guys , just wanting to know if there is a diffrance from the xr8 heads to the fpv gt heads .I have been told by some that the only diffrance is the cams but others say the heads are totaly diffrant .who is right ?

 

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Posted: Tue Nov 11, 2008 11:49 pm 
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It's the cams.
Ive got(rather had) some Ford training stuff that shows the differences(with photos) between all the engines.
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Posted: Wed Nov 12, 2008 7:39 pm 
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- cams with increased lift, BOSS260 10mm lift in/ex, BOSS290 13mm in / 12mm ex

- valve springs, BOSS260 711NM in/ex, BOSS290 780NM in / 760NM ex

- valve springs, free length, BOSS260 45.5mm in / 50.2mm ex, BOSS290 47.1mm in / 51.6mm ex

 

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Posted: Wed Nov 12, 2008 11:41 pm 
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Thanks guys this helps heap cheers for the specs data mine.

 

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Posted: Thu Nov 13, 2008 10:52 am 
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As far as I know, the head casting is the same, but they carry different part numbers. valves are the same. Only differnces I can find detailed are as above.

The extra compression the 290 gets, must be done in the bottom end.

 

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Posted: Fri Nov 14, 2008 12:10 am 
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Thanks data mine valves was my next question .So why cant you put all the 290 top end into a 260, if valves are the same then heads would'nt need to come off would they .The only other differance is pistons. am i right

 

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Posted: Fri Nov 14, 2008 8:43 am 
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The bottom end has a lot more different.

Crank although the same, is blueprinted/balanced with rods and pistons. rods have different end to accommodate the floating gudgeon pins, pistons are different to raise compression.

The important thing, is the whole rotating assembly is matched and balanced together.

 

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Posted: Fri Nov 14, 2008 5:26 pm 
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I found out that the valves are differant lengthes the 290 ones are longer but the artical did not say the length of them ,so if you wanted to spend the bucks you could turn a 260 into a 290 .I had to rebuild mine already and have put the domed forged pistons and h beam rods in it all balanced and blueprinted while i was at it just want to get the heads and cams up to spec . thanks for your help again.

 

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Posted: Fri Nov 14, 2008 5:46 pm 
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No mention in my data of the valves being longed. One thing I didn't pick up on before, was in the 290 the exhaust valve stems are slightly bigger in diameter.

260 6.970-6.949mm
290 6.985-6.971mm

 

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Posted: Fri Nov 14, 2008 5:50 pm 
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anybody know the difference (if any) between the FG 290 and the BF 290?
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Posted: Sat Nov 15, 2008 2:09 am 
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The fg has twin TB's not sure other than that may be up spec cams and tune

 

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Posted: Sat Nov 15, 2008 2:17 am 
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I think they should be if the valve springs are longer, other wise there would be a lot more strain on the valve . need to find that info i wonder if ford would tell me .

 

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Posted: Sat Nov 15, 2008 9:16 am 
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Only the FG315 has the dual TBs, the FG290 AFAIK is the same as the BA-BF 290.

 

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1998 DL LTD in Sparkling Burgundy, daily, 302W, stereo, slow - 97.5rwkw
2006 BF GT-P in Ego, mods. 293rwkw - 12.427@109 - 0-1000m 24.838@221

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Posted: Sat Nov 15, 2008 10:26 am 
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Rodger that .the gt was what i was thinking of ,forgot about the xr8 geting the 290

 

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