205 block can be 450 ?

[sierra90]

hello guys . i have a 205 block i need to make that about 450 .the bore is oversize 91.5 .do i need to put sleeves darton (new bores )????... can handle 8.5 comresion ratio ? also i have arp studs 10 not the long studs ...can be safe for 450 ps ?does anybody done that before ?

[oddkidd]

i had 430 but on a knifes edge.

[sierra90]

i had 430 but on a knifes edge.

why the crank is not so good for 450?

[Mike Rainbird]

hello guys . i have a 205 block i need to make that about 450 .the bore is oversize 91.5 .do i need to put sleeves darton (new bores )????... can handle 8.5 comresion ratio ? also i have arp studs 10 not the long studs ...can be safe for 450 ps ?does anybody done that before ?

The block is likely to crack on No. 3 bore and the ARP studs will also crack the block on the pair second in from the front or the back of the block, as it doesn't have sufficient material there to support rigid bolts.

The crank will do well over 450bhp, it is the 205 block that is the issue (hence the strengthening in the RS500 / 4x4 blocks).

[sierra90]

the 200 block can be well only with arp studs .gt3071 and cometic 5 layer gasket ?

[Mike Rainbird]

the 200 block can be well only with arp studs .gt3071 and cometic 5 layer gasket ?

No Cosworth block can use ARP studs without cracking in the area I described.....





I would not use a Cometic head gasket if you gave it to me FREE. Just use the WRC one - it works properly!

[sierra90]

No Cosworth block can use ARP studs without cracking in the area I described.....





I would not use a Cometic head gasket if you gave it to me FREE. Just use the WRC one - it works properly!

yes but the 200 block can work well only with 10 arp studs with wrc gasket ?

[Nash]

No YB block works well with ARP's 205 or 200! You are thinking of long studding not arp's.

I ran just over 450bhp from a 205 block for 3.5years.

[sierra90]

No YB block works well with ARP's 205 or 200! You are thinking of long studding not arp's.

I ran just over 450bhp from a 205 block for 3.5years.

with standar bore or darton sleeves?205 can not put long stud kit anly arp

[Nash]

.50 bore standard block. I used standard head bolts with a WRC gasket.

[sierra90]

.50 bore standard block. I used standard head bolts with a WRC gasket.

but how?? 205 block is not so thick .can brake easy the bore and they need arp.. is safe like that

[brammer]

Mine ran 440/450 @ 2.4bar on the 0.5 over bored 205 block with a Reinz Grp A head gasket and standard bolts - no issues with the block nor the gasket when the head was removed - the same engine when reinstalled will have a GT3076 strapped to it

[Nash]

People have been doing it for years, the pinto lads run 1.0mm+ bores on 205 blocks without problems. I know these are not turbo's but there litterally 100's of people running with a .5 bore.

[cossiedavid]

i dont think there is a problem at 1mm on a 200 as mine is running 550bhp on 1mm same as dugs at 514bhp

[dan400]

i dont think there is a problem at 1mm on a 200 as mine is running 550bhp on 1mm same as dugs at 514bhp

my 200 block was on a 1mm oversize and it cracked the cyclinder wall ,
was only 420 bhp too