421ci motor ready for rx7

[tinker-27]

i got my new bottom end today to replace the 383 i had got some other bit while i was at it
RHS cnc heads
281xer cam
comp push rods
comp duplex gear
hi rev lifters
eagle stroker crank
i beam rods
forged pistons 11.5-1
ported oil pump
light flywheel
slp under drive pulley
centre force clutch
yella terra rockers
ls2 intake
90mm fast tb
ls2 injectors
emerald ecu
1.75 long tube headers

should be built soon hoping for some serious torque !! the 383 had 530ft lbs (got a spare diff just in case !!!)

practial performance cars mag are doing a feature on it in the next issue (i know its not a hsv but we are all petrol heads after all ?)
out of interest my 383 is now in a cerbera (not finished yet )
cheers craig

[ringram]

Looks nice mate.
Any reason why you didnt go with the stock ecm? I would have thought it would have been way cheaper.

Also you might find you need larger injectors if you like nice duty cycles.

[stevieturbo]

Lots of parts there !!!! But you cant just throw out a list like that, and not show us any pics !

Id have opted for H-beams and a Textralia cutch though.

[ringram]

Ok more questions.. Is that a 6.2l alloy block? or some Iron thingy?
I bet it cost you a pretty penny.

I just saw that RHS Heads are ETP's. Pretty much the top head out there.
That cam is pretty tame for it. Whats the specs on it? 224/228?

[tinker-27]

it is a ls2 alloy block,i have always used emerald even babk in the rover days,they are very adaptable,the cam is big enough as its a everyday car .the heads and cam were what i was using in my 383 and seemed goog in that,as the injectors go i am not sure what the ls2 injectors are like ? the 5.7 one were near there limit on the 383 ,does anyone know how much more the ls2s injectors will handle ? i am aiming more at torque and keeping it usable .it was go the big cc route or forced induction but wanted to keep the instant throttle responce (i know superchargers can be good) anyone running something simalar

[ringram]

Yeah makes sense for torque then.
Some say the fast tb sticks a bit. Be interested to see how you find it. I have a nick williams 90 and fast 90. Depending on what you are reving it to, going by a LS2 stock tune, they look like std 28lb injectors. You might get away with ford svo 30's (come out around 36lb on the gm 4 bar pressure) but Id say you would be over the top on the stock ones.

When do you fire it up? Are you putting it together?

[stevieturbo]

Just throw some Ford SVO green 42lb injectors on it. You can get them for buttons.

[tinker-27]

according to gm ls2 injectors are 32lbs (ls1s are 28 ?)and i can run a bit more fuel pressure if needed ,stevie do you know if ford injectors are the old type (ls1) or new like ls2 ?

[stevieturbo]

tinker-27 said:

according to gm ls2 injectors are 32lbs (ls1s are 28 ?)and i can run a bit more fuel pressure if needed ,stevie do you know if ford injectors are the old type (ls1) or new like ls2 ?

Ah good question... I wasnt aware LS2 types were different ?

The Fords are the typical Bosch injector, same as LS1.

Check out www.racetronix.com, they usually have a good selection at sensible prices.

[tinker-27]

the ls2 are a smaller injector with a smaller plug (same as jag v8) and they fit different you have to use different o rings,you can get a adapter kit

[boosted ls1]

The ls2/1 parts are interchangeable but it's not pretty. You have to use different 'o' rings and it's not pretty.

Boosted.

[tinker-27]

built the motor today and found a few differences the valley plate,follower trays,front cover,oil pressure switch location are all different,should have it running by the weekend fingers crossed !!