It's 12A1456, yeah it's for a stocko 998.
a 12G202 (1098) head is better, but the old 1456 can be ported out the same way, it's just more work (more metal to come out) to get to the same level.
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| a1456 https://www.ausmini.com/forums/viewtopic.php?f=2&t=47092 |
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| Author: | TUCK3r [ Wed Oct 29, 2008 5:33 pm ] |
| Post subject: | a1456 |
A1456 this is the number on the head at the moment is this the standard head for a 998? cheers TUCK3R |
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| Author: | drmini in aust [ Wed Oct 29, 2008 5:47 pm ] |
| Post subject: | |
It's 12A1456, yeah it's for a stocko 998.
a 12G202 (1098) head is better, but the old 1456 can be ported out the same way, it's just more work (more metal to come out) to get to the same level. |
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| Author: | TUCK3r [ Wed Oct 29, 2008 6:03 pm ] |
| Post subject: | |
am i better of going the 202 or stick with the one i have and port that? |
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| Author: | drmini in aust [ Wed Oct 29, 2008 6:22 pm ] |
| Post subject: | |
A 202 is better to start with because ports are bigger and so are the inlet valves. Just bolting it on stock is worth around 3 or 4HP. A 295 is better still, in stock form.. 
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| Author: | TUCK3r [ Wed Oct 29, 2008 7:23 pm ] |
| Post subject: | |
ok thanks for the advice. cheers TUCK3R |
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| Author: | 9YaTaH [ Wed Oct 29, 2008 8:16 pm ] |
| Post subject: | A Head |
drmini in aust wrote: A 202 is better to start with because ports are bigger and so are the inlet valves. Just bolting it on stock is worth around 3 or 4HP.
A 295 is better still, in stock form.. Doc...but if he ported and polished (shaped the combustion chamber) his existing head...and skimmed it to bring the compression up (maybe hardened seats)...would that be just as good 
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| Author: | drmini in aust [ Wed Oct 29, 2008 8:53 pm ] |
| Post subject: | Re: A Head |
9YaTaH wrote: drmini in aust wrote: A 202 is better to start with because ports are bigger and so are the inlet valves. Just bolting it on stock is worth around 3 or 4HP. A 295 is better still, in stock form.. Doc...but if he ported and polished (shaped the combustion chamber) his existing head...and skimmed it to bring the compression up (maybe hardened seats)...would that be just as good Not unless he fits bigger inlet valves, reshapes and deshrouds the chambers, decks it and enlarges the ports a lot. Around 2x as much work as porting a 202 head, IMO.
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| Author: | 9YaTaH [ Wed Oct 29, 2008 9:56 pm ] |
| Post subject: | Re: A Head |
drmini in aust wrote: 9YaTaH wrote: drmini in aust wrote: A 202 is better to start with because ports are bigger and so are the inlet valves. Just bolting it on stock is worth around 3 or 4HP. A 295 is better still, in stock form.. Doc...but if he ported and polished (shaped the combustion chamber) his existing head...and skimmed it to bring the compression up (maybe hardened seats)...would that be just as good Not unless he fits bigger inlet valves, reshapes and deshrouds the chambers, decks it and enlarges the ports a lot. Around 2x as much work as porting a 202 head, IMO. Ohhh? do tell  ...so 202 is reasonably desirable for that reason alone  
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| Author: | Mick [ Wed Oct 29, 2008 10:06 pm ] |
| Post subject: | Re: A Head |
9YaTaH wrote: Ohhh? do tell ...so 202 is reasonably desirable for that reason alone It was a Cooper 997 head you know...should have Cooper tax applied! |
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| Author: | TUCK3r [ Thu Oct 30, 2008 6:31 pm ] |
| Post subject: | |
shhhhhhhhhhhh tax is bad |
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