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mixing blocks and heads
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06-01-2005, 02:25 PM
Post: #1
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mixing blocks and heads
hi!
i was going through some specs and tech articles, and i wonder something.. Does the 4a-f use the same block as the 4a-g? can a "f-spec" narrow angle head be swaped for a "g-spec" wide angle head ? and another thing.. does the same "g spec" head (4ag) work with a bigger a-series block (like 7a-fe 1800 ccm) found in coronas and such? |
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06-01-2005, 02:41 PM
Post: #2
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mixing blocks and heads
well, it's possible that the 1800 block is the same, but bored more...that's all...
can't say a thing tho...;] 
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06-01-2005, 04:07 PM
Post: #3
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mixing blocks and heads
7AF(E)+ 4AGE head=7AGE - yes, it's possible (and described in tech section of Club4AG).
7AFE is 81mm bore (same as 4A series) - difference is in crankshaft (stroke). |
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06-01-2005, 05:26 PM
Post: #4
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mixing blocks and heads
jamiemirror Wrote:7AF(E)+ 4AGE head=7AGE - yes, it's possible (and described in tech section of Club4AG).We have our own howto written by H37RO: http://www.aeu86.org/Writeup/Engine/4AGE...index.html and http://www.aeu86.org/viewtopic.php?t=1064&start=0 
1983 - AE86 Sprinter Trueno - import project 2013 - Honda Civic sport - daily driver 2004 - AEU86 dot ORG - daily domain Support our forum, buy from the AEU86 shop: ![[Image: AEU86 AE86 - mixing blocks and heads]](https://www.aeu86.org/sticker-banner-468.gif "AEU86 AE86 - mixing blocks and heads")
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06-01-2005, 09:32 PM
Post: #5
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mixing blocks and heads
nice!
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06-02-2005, 08:55 AM
Post: #6
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mixing blocks and heads
nice! how does it drive? its a shame u loose that peek.. do we have any graphs? how much power does it make?
so then i guess it is not a problem to fit a g-head onto 4afe making it 4 age? bore and stroke are the same.. |
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06-02-2005, 08:58 AM
Post: #7
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mixing blocks and heads
A 4AGE head fits on a 4AFE block, but the internals of the 4AFE block are weaker and may not stand the high rpms of a 4AGE.
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06-02-2005, 09:04 AM
Post: #8
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mixing blocks and heads
I'd say it's only worth the effort on a 7afe block. You should also read all of Bill Sherwood's teachings on http://www.billzilla.org.
He even considered using a specific 4afe head on a 4age block due to better flow characteristics, and knowing Bill it' probably not even that crazy an idea. FABRICA MI DIEM, PVNC! |
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09-24-2006, 03:45 AM
Post: #9
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mixing blocks and heads
Very old topic, but apart from the weaker internals, are the 4A-FE blocks the same as 4A-GE's ?
Can a 4A-FE block be fitted with 4A-GE Crank/Rods/Pistons ? Most 4A-GE's have done heaps of km's, and its a lot easier to find a low km 4A-FE, with nice bores, to convert to GE spec. Anyone know? ![[Image: AEU86 AE86 - mixing blocks and heads]](http://www.ae86.pl/ae86banner.jpg "AEU86 AE86 - mixing blocks and heads") Always remember: Rev it till it blows, then back off a bit... Zenkis - Orange, Red/Black, Silver/Black, Maroon/Blue Koukis - Red, Silver/Gray, |
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09-24-2006, 09:37 AM
Post: #10
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mixing blocks and heads
Daytone,
Since the 4AFE blocks are longer then 4AGE blocks and have bigger stroke I doubt they can fit 4AGE crank/rods/pistons. Or if they do fit they will probably loose performance because the pistons will not move up and down the whole lenght of the cylinder. But I aint sure.. TE71Corolla currently runs a 7AGE (so 7AFE block with 4AGE head) in his TE71 (see projects thread) with carbs. At the BBQ day he mentioned that the block pulls much better then a 4AGE but it redlines at 6500 rpm or so, he really misses the revvyness of the 4AGE. I wouldn't mind seeing some dyno info on that car 
Greetz, Bastiaan "mux213" Olij Moved down under, no more hachi 
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