FORD_MAN

Watching The Skid Factory (youtube) I've seen them use heat gun to winkle up the winkle paint,
*after a bit of looking back through your thread, as a temp exhaust, cut through the expanded part on the collector & rotate to the left (guessing 4-7mm) then reweld, should work
Those extractors also look to tapper down to fit in that small "collector" that looks to just be a flared bit of pipe from when they were made,
if so, I'd cut them back where they are still round (maybe extend the secondary's a bit & put a pair of mandrel bends from where you cut) then put a twin 1 ?/?" in to 2" out collector, also with the extractors does the 4th cyl pipe go into the side of the 1st cyl, or is the collector just hidden by 2&3 (hard to tell from photos).
 
As to pipe size Vs engine as a EG. VE SV6 3.6lt has 2 1/4" twin from factory, 1800cc per bank, so 2" will be fine for a 1660cc.
also to 2" single on 4.1, from memory BF E-gas utes have 2 3/4" exhaust, & EA onwards were always 2 1/4".

Watching The Skid Factory (youtube) I've seen them use heat gun to winkle up the winkle paint,
*after a bit of looking back through your thread, as a temp exhaust, cut through the expanded part on the collector & rotate to the left (guessing 4-7mm) then reweld, should work
Those extractors also look to tapper down to fit in that small "collector" that looks to just be a flared bit of pipe from when they were made,
if so, I'd cut them back where they are still round (maybe extend the secondary's a bit & put a pair of mandrel bends from where you cut) then put a twin 1 ?/?" in to 2" out collector, also with the extractors does the 4th cyl pipe go into the side of the 1st cyl, or is the collector just hidden by 2&3 (hard to tell from photos).
 
As to pipe size Vs engine as a EG. VE SV6 3.6lt has 2 1/4" twin from factory, 1800cc per bank, so 2" will be fine for a 1660cc.
also to 2" single on 4.1, from memory BF E-gas utes have 2 3/4" exhaust, & EA onwards were always 2 1/4".

Watching The Skid Factory (youtube) I've seen them use heat gun to winkle up the winkle paint,
*after a bit of looking back through your thread, as a temp exhaust, cut through the expanded part on the collector & rotate to the left (guessing 4-7mm) then reweld, should work
Those extractors also look to tapper down to fit in that small "collector" that looks to just be a flared bit of pipe from when they were made,
if so, I'd cut them back where they are still round (maybe extend the secondary's a bit & put a pair of mandrel bends from where you cut) then put a twin 1 ?/?" in to 2" out collector, also with the extractors does the 4th cyl pipe go into the side of the 1st cyl, or is the collector just hidden by 2&3 (hard to tell from photos).
 
As to pipe size Vs engine as a EG. VE SV6 3.6lt has 2 1/4" twin from factory, 1800cc per bank, so 2" will be fine for a 1660cc.
also to 2" single on 4.1, from memory BF E-gas utes have 2 3/4" exhaust, & EA onwards were always 2 1/4".

Watching The Skid Factory (youtube) I've seen them use heat gun to winkle up the winkle paint,
*after a bit of looking back through your thread, as a temp exhaust, cut through the expanded part on the collector & rotate to the left (guessing 4-7mm) then reweld, should work
Those extractors also look to tapper down to fit in that small "collector" that looks to just be a flared bit of pipe from when they were made,
if so, I'd cut them back where they are still round (maybe extend the secondary's a bit & put a pair of mandrel bends from where you cut) then put a twin 1 ?/?" in to 2" out collector, also with the extractors does the 4th cyl pipe go into the side of the 1st cyl, or is the collector just hidden by 2&3 (hard to tell from photos).
 
As to pipe size Vs engine as a EG. VE SV6 3.6lt has 2 1/4" twin from factory, 1800cc per bank, so 2" will be fine for a 1660cc.
also to 2" single on 4.1, from memory BF E-gas utes have 2 3/4" exhaust, & EA onwards were always 2 1/4".

Bros ZH 302c, 350 Holley, 3.0 9", got 15.3lt/100km with slipping almost dead C4 auto (with no 2nd gear),
Dissy gear depends on what core is used Comp -8 cams are cast core which can use composite & maybe steel (I need to research them a bit) as where -9 is steel billet that needs bronze which wear over time, or Comp & Crow sell melonized/melonite gears which can be used on different cores cast flat tappet, hyd roller & 1050 soild roller & don't wear out.
Crow MG6 (.531") MG11 (.491") $99ea

Bros ZH 302c, 350 Holley, 3.0 9", got 15.3lt/100km with slipping almost dead C4 auto (with no 2nd gear),
Dissy gear depends on what core is used Comp -8 cams are cast core which can use composite & maybe steel (I need to research them a bit) as where -9 is steel billet that needs bronze which wear over time, or Comp & Crow sell melonized/melonite gears which can be used on different cores cast flat tappet, hyd roller & 1050 soild roller & don't wear out.
Crow MG6 (.531") MG11 (.491") $99ea

Bros ZH 302c, 350 Holley, 3.0 9", got 15.3lt/100km with slipping almost dead C4 auto (with no 2nd gear),
Dissy gear depends on what core is used Comp -8 cams are cast core which can use composite & maybe steel (I need to research them a bit) as where -9 is steel billet that needs bronze which wear over time, or Comp & Crow sell melonized/melonite gears which can be used on different cores cast flat tappet, hyd roller & 1050 soild roller & don't wear out.
Crow MG6 (.531") MG11 (.491") $99ea

@gerg mine is next up 21603, 214/214 510/510 110, Umm fuel economy is hard to say as ute runs 4.11 diff. but did once have 17.8lt/100km, normally like 23lt/100km, also with 4.11's & 2800 stall bottom end torque isn't an issue. . but did notice big pick up in low end when changed from AFD hi rise back to dual plane. As to larger cam & bottom end my XF ute has 237@50 cam & bottom end is just like a stock crossflow till revs raise into cams power range & off it goes, still stock convertor & did drive with 2.92 diff for a while.
I'll be looking at hyd roller for my XE S-pak utes 302c, tho it might just stretch to 393.

I'll PM you a bunch of links, I've got links to older catalog listings.

Yeah have read up to .550" & .560" from various forums over the years, GTHO/BOSS 351 style can go .580", Ford USA actually made a drag cam around 245/256 560/570 back in the day
.490"-.500" lift is for stock springs,
 

new crate 430hp 475ft/lb 7.3 Godzilla is $7000 USD, then plus taxes & freight, there is at least 2 companies importing them to Aus,
My Bro uses a knife sharping stone at work for cleaning up block & head surfaces. BEAR/Norton KS100 large Silicon carbide combo stone, has coarse & fine side, I use same for knifes.
Rod shop mounts look good, I have their trans mount in my black ute,
Cam range is based on 351 so 1500/4500 would be more like 1000-4000ish on 400M, like my 302C cam is rated as up to 5000 but pulls to 5500,
Crow cams have a few of lower lift (under .550") hyd rollers up to 226/230@50. also one at 552/553 which should work with std rockers

@gerg mine is next up 21603, 214/214 510/510 110, Umm fuel economy is hard to say as ute runs 4.11 diff. but did once have 17.8lt/100km, normally like 23lt/100km, also with 4.11's & 2800 stall bottom end torque isn't an issue. . but did notice big pick up in low end when changed from AFD hi rise back to dual plane. As to larger cam & bottom end my XF ute has 237@50 cam & bottom end is just like a stock crossflow till revs raise into cams power range & off it goes, still stock convertor & did drive with 2.92 diff for a while.
I'll be looking at hyd roller for my XE S-pak utes 302c, tho it might just stretch to 393.

@gerg mine is next up 21603, 214/214 510/510 110, Umm fuel economy is hard to say as ute runs 4.11 diff. but did once have 17.8lt/100km, normally like 23lt/100km, also with 4.11's & 2800 stall bottom end torque isn't an issue. . but did notice big pick up in low end when changed from AFD hi rise back to dual plane. As to larger cam & bottom end my XF ute has 237@50 cam & bottom end is just like a stock crossflow till revs raise into cams power range & off it goes, still stock convertor & did drive with 2.92 diff for a while.
I'll be looking at hyd roller for my XE S-pak utes 302c, tho it might just stretch to 393.

new crate 430hp 475ft/lb 7.3 Godzilla is $7000 USD, then plus taxes & freight, there is at least 2 companies importing them to Aus,
My Bro uses a knife sharping stone at work for cleaning up block & head surfaces. BEAR/Norton KS100 large Silicon carbide combo stone, has coarse & fine side, I use same for knifes.
Rod shop mounts look good, I have their trans mount in my black ute,
Cam range is based on 351 so 1500/4500 would be more like 1000-4000ish on 400M, like my 302C cam is rated as up to 5000 but pulls to 5500,
Crow cams have a few of lower lift (under .550") hyd rollers up to 226/230@50. also one at 552/553 which should work with std rockers

I'll PM you a bunch of links, I've got links to older catalog listings.

Yeah have read up to .550" & .560" from various forums over the years, GTHO/BOSS 351 style can go .580", Ford USA actually made a drag cam around 245/256 560/570 back in the day
.490"-.500" lift is for stock springs,
 

new crate 430hp 475ft/lb 7.3 Godzilla is $7000 USD, then plus taxes & freight, there is at least 2 companies importing them to Aus,
My Bro uses a knife sharping stone at work for cleaning up block & head surfaces. BEAR/Norton KS100 large Silicon carbide combo stone, has coarse & fine side, I use same for knifes.
Rod shop mounts look good, I have their trans mount in my black ute,
Cam range is based on 351 so 1500/4500 would be more like 1000-4000ish on 400M, like my 302C cam is rated as up to 5000 but pulls to 5500,
Crow cams have a few of lower lift (under .550") hyd rollers up to 226/230@50. also one at 552/553 which should work with std rockers

i orderd a set of 400 mounts today that suit xa to xg $280 and bolt to our v8 chassis plates,castlemain rod shop do em,and he was surprised how many sets they have sold,its gunna take 2 weeks cause he is out of stock,sure beats mucking around with spacers and crap,i will post a pic as soon as i get em.outback jack would like the fact that they fit a xg🤣

Umm no it wasn't look up the (petrol) 7.3lt ''Godzilla" used in US F trucks, thats a engine I'd like in my XE ute, Harrop recently made 1000hp at Dandy engines with a stock engine, GT350 throttle body & a supercharger kit they're developing, also seen 750hp N/A, ?1340hp? can't remember turbo/supercharged. stock is 450ft/lb 430hp, add turbo

I have blue & black closed chamber heads, some time might see if neighbor still has his flow bench & compare, but I'd say wound be minimal flow stock.
Sean/Clevo120Y flowed a 2V closed chamber few years back

I was looking at 351C or 400M vs 393/408C awhile ago figured similar, may as well go stroker,

Gerg has already posted a good guide. & yes they get can expensive once your looking at over 250hp flywheel, they are only 140hp stock with carb,
Crow roller rockers will need 7/16" studs & guide plates, I'd go with Yella terra. I run the flat top polished version of Aussiespeed rocker cover, brought from Ron/Kustom bitz as well.
Key to power on Crossflow is head work, there is also a thread on xflow head porting in the Crossflow section, standard flow around 175cfm@.550", ported street head tend to be around the 205-215CFM@.550" quite a few ported heads tend to flow upto .550" then become harder to get higher lift flow. my CNC head flowed 236cfm at .550" & upto 250cfm @.650". A lower flowing head will need more camshaft duration to make similar power. Auto would be nicer for the strip,
 
My XF ute made 252rwhp rebuilt myself, balanced, 250 crossflow with hypertec pistons, resized rods with ARP bolts, C2 CNC ported head, 237@50 550" hyd cam, street terra rockers, crow moly pushrods, aussiespeed 4 barrel, QFT600 Vac sec, stock BW51 & regraphed XE/XF dissy (for now), 3.45LSD, figures say 10.1:1 Comp, still yet to race it after being tuned.
build thread below
 

Umm no it wasn't look up the (petrol) 7.3lt ''Godzilla" used in US F trucks, thats a engine I'd like in my XE ute, Harrop recently made 1000hp at Dandy engines with a stock engine, GT350 throttle body & a supercharger kit they're developing, also seen 750hp N/A, ?1340hp? can't remember turbo/supercharged. stock is 450ft/lb 430hp, add turbo

I have blue & black closed chamber heads, some time might see if neighbor still has his flow bench & compare, but I'd say wound be minimal flow stock.
Sean/Clevo120Y flowed a 2V closed chamber few years back

I was looking at 351C or 400M vs 393/408C awhile ago figured similar, may as well go stroker,

Umm no it wasn't look up the (petrol) 7.3lt ''Godzilla" used in US F trucks, thats a engine I'd like in my XE ute, Harrop recently made 1000hp at Dandy engines with a stock engine, GT350 throttle body & a supercharger kit they're developing, also seen 750hp N/A, ?1340hp? can't remember turbo/supercharged. stock is 450ft/lb 430hp, add turbo

I have blue & black closed chamber heads, some time might see if neighbor still has his flow bench & compare, but I'd say wound be minimal flow stock.
Sean/Clevo120Y flowed a 2V closed chamber few years back

I was looking at 351C or 400M vs 393/408C awhile ago figured similar, may as well go stroker,