1983 Toyota Celica GT-S - Message Forum (Re: CLOSER PIX OF HEAD & BLOCK)

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Re: CLOSER PIX OF HEAD & BLOCK

Posted By:	OldMage
Posted On:	December 18, 2004 at 12:07 am GMST

Umm, just cuz the chambers have been modded to fit the domed pistons doesn't mean it'll work.  It might... but I wouldn't take the chance.  The 85-up engines also used a shorter timing chain cuz of the lower deck-height.  I believe the later heads were also taller than the early heads.  All of this means your cam in that head may not be the right distanct from the crankshaft for the timing chain to fit properly.

Are the exhaust ports in that head "pear shaped" or round?  Pear-shaped ports confirms it's a later head.  BTW, the exhaust manifold studs are in a different pattern on the later heads & your exhaust may no longer fit on that head.

"OldMage"
'83 Celica GT-S coupe, EFI hybrid
Camas, WA  USA
http://www.speedtoys.com/~oldmage/

paul ubongen wrote:

> ok... here's a pick of my 83 block
>
> and here's a closer pick of the 85 head
>
> please verify once more that it will not work. I have
> a mechanic who says it will. if you notice on the
> head.. the cyliner port area has been shaved here and
> there to accomodate for the 83 piston head. I know I
> know... it won't work, but please tell me again so that
> I may tell him.
>
> thanx, paul

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Message:	OldMage wrote: > Umm, just cuz the chambers hav > e been modded to fit the domed > pistons doesn't mean it'll wo > rk. It might... but I wouldn' > t take the chance. The 85-up > engines also used a shorter ti > ming chain cuz of the lower de > ck-height. I believe the late > r heads were also taller than > the early heads. All of this > means your cam in that head ma > y not be the right distanct fr > om the crankshaft for the timi > ng chain to fit properly. > > Are the exhaust ports in that > head "pear shaped" or round? > Pear-shaped ports confirms it' > s a later head. BTW, the exha > ust manifold studs are in a di > fferent pattern on the later h > eads & your exhaust may no lon > ger fit on that head. > > "OldMage" > '83 Celica GT-S coupe, EFI hyb > rid > Camas, WA USA > http://www.speedtoys.com/~oldm > age/ > > paul ubongen wrote: > > > ok... here's a pick of my 83 > block > > > > and here's a closer pick of > the 85 head > > > > please verify once more that > it will not work. I have > > a mechanic who says it will. > if you notice on the > > head.. the cyliner port area > has been shaved here and > > there to accomodate for the > 83 piston head. I know I > > know... it won't work, but p > lease tell me again so that > > I may tell him. > > > > thanx, paul
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