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Location:
northern beaches
Registered:
August 2002
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smallport head onto 20v block
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Tue, 02 August 2005 10:24
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i wish to fit a smallport head to a 20v block that has been fitted with gze pistons, so the valve relifs should be in the right place. i have lined the two head gaskets up and it all looks to line up. has anyone done this before and can tell me if there are any problems i havent thought of?
ohh the other problem is the smallport heads external oil drain, can i just weld a fitting into the sump and conect it there?
p.s. i searched, but only to find info for ppl putting 20v heads onto smallport blocks.
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Registered:
September 2004
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Re: smallport head onto 20v block
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Wed, 03 August 2005 01:45
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Hi cri_ag
My current setup is a smallport head with blacktop bottom end and Wiseco pistons. I had to block the oil drain in the head. I'd recommend using a silvertop bottom end as the tensioner, oil pump and covers line up correctly. The blacktop bottom end has a silicon tensioner which means you'll have problems fitting the front covers.
Also if this is a RWD configuration, be careful when bolting on the gearbox support brackets. I broke a piece off mine because the bolt holes weren't the correct height. Doh!
Hope this helps!
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Banned by his request
Location:
moved to tamworth
Registered:
July 2002
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Location:
northern beaches
Registered:
August 2002
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Re: smallport head onto 20v block
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Thu, 04 August 2005 11:37
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thanks heaps for that dori-kin, whats the best way to determine if i have a silver top block or a black top block? by the tensioner like you mentioned?
i want to do this as i have a 20v block thats been o-ringed and fitted with forgies, reason enough for you?
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Banned by his request
Location:
moved to tamworth
Registered:
July 2002
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Re: smallport head onto 20v block
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Thu, 04 August 2005 21:16
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youd be happer with a 20v head unless you have a worked 16v head.20v heads are not very expensive.
mick
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Location:
Brisbane
Registered:
June 2002
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Re: smallport head onto 20v block
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Thu, 04 August 2005 21:54
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20v head and QUADDIES!
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Registered:
September 2004
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Re: smallport head onto 20v block
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Fri, 05 August 2005 04:20
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cri_ag: I think the timing belt tensioner is the easiest way to tell between blacktop and silvertop blocks. The silvertop has a spring tensioned bearing whereas the blacktop has a silicon tensioner (cylindrical tube with pin sticking out of it)
kingmick: I used the blacktop bottom end because I got it for cheap, blacktop crankshafts were machined to tighter tolerances and the conrods are much lighter (compared to smallport 100kw.) It's also much more work adapting a 20V head for RWD configuration (water lines etc.) whereas smallport is pretty much plug 'n play.
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Banned by his request
Location:
moved to tamworth
Registered:
July 2002
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Re: smallport head onto 20v block
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Sat, 06 August 2005 10:20
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its a little bit harder but worth it. otherwisr you better of with a smallprt bottom end.
mick
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Location:
northern beaches
Registered:
August 2002
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Re: smallport head onto 20v block
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Sat, 06 August 2005 10:20
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thanks again dori-kin i will have a closer look at my block to determine which i have.
i dont want a 20v head because as dori-kin mentioned, i dont want the hasles accociated with the distributor and water lines. also the block has been fitted with the gze 16v pistons so the valve relifs are incorrect for a 20v. 20v heads may be cheap but the throtles and other accociated gear to make them work are not.
i have the 100kw head and manifold and have already modified the manifold to suit, i would rather work with what i have got than create more problems for myself.
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Location:
northern beaches
Registered:
August 2002
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Re: smallport head onto 20v block
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Sat, 06 August 2005 10:23
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| kingmick wrote on Sat, 06 August 2005 20:20 |
its a little bit harder but worth it. otherwisr you better of with a smallprt bottom end.
mick
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why?
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