FORD_MAN

@DeanKDX SLY250 runs a modified XH crank,
for new I'd look up Quickfuel 450 slayer vac sec, similar to holley but has more tuneable features like changeable air bleeds & rear jets, I have a Slayer 600 (VSF) on mine,
250 xflow has air flow requirement of 460ish cfm at 5500rpm,
crank gear at 0° if not dialing in, surprised at the mains bolt breaking,  Engine looks alright, good luck with the build.

@DeanKDX SLY250 runs a modified XH crank,
for new I'd look up Quickfuel 450 slayer vac sec, similar to holley but has more tuneable features like changeable air bleeds & rear jets, I have a Slayer 600 (VSF) on mine,
250 xflow has air flow requirement of 460ish cfm at 5500rpm,
crank gear at 0° if not dialing in, surprised at the mains bolt breaking,  Engine looks alright, good luck with the build.

@DeanKDX SLY250 runs a modified XH crank,
for new I'd look up Quickfuel 450 slayer vac sec, similar to holley but has more tuneable features like changeable air bleeds & rear jets, I have a Slayer 600 (VSF) on mine,
250 xflow has air flow requirement of 460ish cfm at 5500rpm,
crank gear at 0° if not dialing in, surprised at the mains bolt breaking,  Engine looks alright, good luck with the build.

I copied what I saw on Ford Forums, made a valve spring compressor from a old standard rocker,
cut out the contact center where is pushes the valve down, & bent out the sides a bit. then welded a pipe to the side of it
could always weld the pipe on so it goes vertically for if in car, which I might end up doing to the other end of the pipe on mine.
OR weld a old socket to it & use a breaker bar.
Also made a air fitting from a old spark plug, to hook up to the air compressor to pressurize the chamber & keep the valves closed.

I copied what I saw on Ford Forums, made a valve spring compressor from a old standard rocker,
cut out the contact center where is pushes the valve down, & bent out the sides a bit. then welded a pipe to the side of it
could always weld the pipe on so it goes vertically for if in car, which I might end up doing to the other end of the pipe on mine.
OR weld a old socket to it & use a breaker bar.
Also made a air fitting from a old spark plug, to hook up to the air compressor to pressurize the chamber & keep the valves closed.

Also if your got a Weber carby needs +ve to the fuel cut solenoid

I found Sealed Power 400M dished piston, part no. 427NP 30, By Summit say Dish is 3"x0.145" = 16.78cc + valve relief =18-19cc
4.030" bore, 4.000" stroke, 57cc head, 18 cc piston, 4.100"x0.041" gasket, 0.060" deck = 9.67:1
https://uempistons.com/p-27-compression-ratio-calculator.html

I found Sealed Power 400M dished piston, part no. 427NP 30, By Summit say Dish is 3"x0.145" = 16.78cc + valve relief =18-19cc
4.030" bore, 4.000" stroke, 57cc head, 18 cc piston, 4.100"x0.041" gasket, 0.060" deck = 9.67:1
https://uempistons.com/p-27-compression-ratio-calculator.html

Hypertec make a dished (12cc?) piston to suit 351 crank & 351 rod with closed chamber heads($438.61), or can open up the chamber a bit with burr & use flat top piston,
https://www.precisionintl.com/StockSearch.aspx?Search=PFO351C81H
Hypertec also make shorter piston suit 351 crank & 302C rod, flat top $438.61
https://www.precisionintl.com/StockSearch.aspx?Search=PFO351C683H
 
zero decked 351 with flat top & closed chamber heads are easy 11.3:1 or standard deck around 10.3:1, zero deck 351 with dished 10.1:1
also known for the locks to pull through standard retainers over 5500, best to upgrade valve springs, retainers & locks, & is needed for larger then 0.500" lift cam
 

Hypertec make a dished (12cc?) piston to suit 351 crank & 351 rod with closed chamber heads($438.61), or can open up the chamber a bit with burr & use flat top piston,
https://www.precisionintl.com/StockSearch.aspx?Search=PFO351C81H
Hypertec also make shorter piston suit 351 crank & 302C rod, flat top $438.61
https://www.precisionintl.com/StockSearch.aspx?Search=PFO351C683H
 
zero decked 351 with flat top & closed chamber heads are easy 11.3:1 or standard deck around 10.3:1, zero deck 351 with dished 10.1:1
also known for the locks to pull through standard retainers over 5500, best to upgrade valve springs, retainers & locks, & is needed for larger then 0.500" lift cam
 

Hypertec make a dished (12cc?) piston to suit 351 crank & 351 rod with closed chamber heads($438.61), or can open up the chamber a bit with burr & use flat top piston,
https://www.precisionintl.com/StockSearch.aspx?Search=PFO351C81H
Hypertec also make shorter piston suit 351 crank & 302C rod, flat top $438.61
https://www.precisionintl.com/StockSearch.aspx?Search=PFO351C683H
 
zero decked 351 with flat top & closed chamber heads are easy 11.3:1 or standard deck around 10.3:1, zero deck 351 with dished 10.1:1
also known for the locks to pull through standard retainers over 5500, best to upgrade valve springs, retainers & locks, & is needed for larger then 0.500" lift cam
 

Hypertec make a dished (12cc?) piston to suit 351 crank & 351 rod with closed chamber heads($438.61), or can open up the chamber a bit with burr & use flat top piston,
https://www.precisionintl.com/StockSearch.aspx?Search=PFO351C81H
Hypertec also make shorter piston suit 351 crank & 302C rod, flat top $438.61
https://www.precisionintl.com/StockSearch.aspx?Search=PFO351C683H
 
zero decked 351 with flat top & closed chamber heads are easy 11.3:1 or standard deck around 10.3:1, zero deck 351 with dished 10.1:1
also known for the locks to pull through standard retainers over 5500, best to upgrade valve springs, retainers & locks, & is needed for larger then 0.500" lift cam
 

I did have a list think was from Car Craft Magazine HP loss from auto (Approx) , C4 28hp, C6 55-60hp, FMX 25hp

I did have a list think was from Car Craft Magazine HP loss from auto (Approx) , C4 28hp, C6 55-60hp, FMX 25hp

using UEM(KB) pistons calc 58cc, 20cc, 0.060", 4.1x0.041", 4.030x4" 9.41:1 or 9.68:1 with 4.1x0.027" MLS Cometic C5871-027
standard rockers can handle upto .550", manifolds reversed (LH to RH/RH to LH) for turbo header,
https://uempistons.com/p-27-compression-ratio-calculator.html
https://www.ebay.com.au/itm/Cometic-Gasket-C5871-027-027-Mls-Head-Gasket-Ford-351-Cleveland-4-100-Bore/233431488377?hash=item365999d779:g:Io8AAOSwGshd8cmA

Roadkills Rotsun makes 550hp 617ft/lb with stock 87 5.0lt windsor 15psi blow thru turbo
https://www.hotrod.com/articles/rotsuns-turbo-5-0-beats-everyones-epectations-engine-masters-617-lb-ft/

Left to right connector, Black A/C?, Yellow 7 volt for weber choke, brown ?, red w/green line would be weber fuel cut solenoid.
2 pin plug if red w/green line, & pink w/blue line is EST coil wiring,
connector near dissy is canister purge valve,

With what specs I could find on yours 10.9?:1, 230@50 .553" guessed 2200-5500, 5300 peak on the Kustom Bitz dyno program,
(street head) 245hp@5300rpm 286ft/lb@3200 (Race Head) 270hp@5300 305ft/lb@3500.

I thought the D head was similar to the C2/C2A head around the 43cc mark, A stock C1A I measured around 47cc
My CNC C2 with sharp part of the chamber rounded off & EVL valves (have a dished face) was measured at 49cc,
Ported & shaved XD head I brought off Sean/Clevo120Y is 50cc,
Off memory Standard XD/XE/E1 55-57cc, E2 50-52, C1/C1A 48-50cc C2/C2A&D 42-44cc, there's a old thread on here that has chamber CC's listed.
 
Kustom Bitz has a free dyno program I've been playing around with for ages, Runs in Excel. http://kustombitz.com/g/9081/fun-free-stuff.html
There was a thread on here(or XFal) years ago about it. Put in Engine Ci & comp, Cam @50, lift & rpm range.

The T Meyer pistons are Keith Black/KB "Claimer" pistons. 1.710" pin height, 0.975" pin, 13.3cc. TMEYER catalog lists them as TMI/KB2347
searching KB site found silv-o-lite 3327H is a Ford (AUS) 250/4.1 flat top 1.530"pin height, 3328H is dished 8CC
google search also came up with another KB piston that apparently suits is KB2334 flat top, 1.720" pin height,
also found flat top forged 4032 pistons, 1.700" $578US,
https://www.ebay.com.au/itm/FORD-400-400M-MODIFIED-FORGED-FLAT-TOP-HIGH-COMPRESSION-PISTONS-/253088573838
 

The T Meyer pistons are Keith Black/KB "Claimer" pistons. 1.710" pin height, 0.975" pin, 13.3cc. TMEYER catalog lists them as TMI/KB2347
searching KB site found silv-o-lite 3327H is a Ford (AUS) 250/4.1 flat top 1.530"pin height, 3328H is dished 8CC
google search also came up with another KB piston that apparently suits is KB2334 flat top, 1.720" pin height,
also found flat top forged 4032 pistons, 1.700" $578US,
https://www.ebay.com.au/itm/FORD-400-400M-MODIFIED-FORGED-FLAT-TOP-HIGH-COMPRESSION-PISTONS-/253088573838
 

I looked up the 400M last night after reading this, deck clearance 0.067", later smog engines got 15cc dished piston & Cam retarded 6°, some of the heads up to 79cc chamber,
Watching the latest Engine Masters, mopar did similar things with the motorhome 440's they're pistons like are 0.100" down the bore.
Found a few articles from Richard Holdener of motortread group, around 2009/2010 did a few 400M build ups,
stock reco & with 4 barrel, Ford 400M Engine Rebuild - Hot Rod Network
with Procomp heads Pro Comp Head Test - Muscle Mustangs & Fast Fords
also seen a stoker build with offset ground crank, 6.3 chev rod & 340 mopar piston,

I looked up the 400M last night after reading this, deck clearance 0.067", later smog engines got 15cc dished piston & Cam retarded 6°, some of the heads up to 79cc chamber,
Watching the latest Engine Masters, mopar did similar things with the motorhome 440's they're pistons like are 0.100" down the bore.
Found a few articles from Richard Holdener of motortread group, around 2009/2010 did a few 400M build ups,
stock reco & with 4 barrel, Ford 400M Engine Rebuild - Hot Rod Network
with Procomp heads Pro Comp Head Test - Muscle Mustangs & Fast Fords
also seen a stoker build with offset ground crank, 6.3 chev rod & 340 mopar piston,

There is a local factory Boss 302 is a street/circuit car has drag raced it a few times,
Have thought a few times of getting my bros spare 5.0lt, basic reco with 230°ish cam, some Aeroflow alloy heads or AFD alloys, air gap or victor jr & maybe some nitrous...
another idea was Aussie Speed Boss 302 hi rise to suit 2V Cleveland heads, & SRP BOSS 302 piston to suit Aussie 2v heads (302C closed chamber) 3.5cc dome,
As for porting I brought a Makita 240V 1/4" die grinder (GD0600) & a long shank burr, heaps nicer then waiting on the compressor to try & keep up with my bluepoint die grinder.

There is a local factory Boss 302 is a street/circuit car has drag raced it a few times,
Have thought a few times of getting my bros spare 5.0lt, basic reco with 230°ish cam, some Aeroflow alloy heads or AFD alloys, air gap or victor jr & maybe some nitrous...
another idea was Aussie Speed Boss 302 hi rise to suit 2V Cleveland heads, & SRP BOSS 302 piston to suit Aussie 2v heads (302C closed chamber) 3.5cc dome,
As for porting I brought a Makita 240V 1/4" die grinder (GD0600) & a long shank burr, heaps nicer then waiting on the compressor to try & keep up with my bluepoint die grinder.