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GWEE

7afe Crank

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i see alot of talk about the 7age hybrid and how sometimes it can be a bitch to do. would putting the crank from a 7afe into a 4age block be possible?

 

ext: small block 400 crank in a 350 block strokes it out to 376cuin

Edited by GWEE

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i see alot of talk about the 7age hybrid and how sometimes it can be a bitch to do. would putting the crank from a 7afe into a 4age block be possible?

 

ext: small block 400 crank in a 350 block strokes it out to 376cuin

 

I think all the talk about such hybrid is about slapping a 4AGE head over a 7AFE block, complete with crank from latter.

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yea but all the bull you have to go through to build it. wouldnt be just easyer to have a longer stroke crank in the 4age be a better choice?

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its the crank that causes for a long stroke.

 

ext: a small block 350 has a 3.480" stroke and the smallblock 400 has a 3.750

the 7afe has a 85.5mm stroke and i guess the 4age engine has the same size stroke as the 4afe engine which is 77mm.

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woulnt you have to take the crank out anyway to change the pistons? dont more ppl that build the 7age use the pistons from the 4age?

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the main bearings are different size iirc. when you make a 7age you put a 4age head on a 7afe block, you must also have 4age pistons modified to fit the stock 7afe rods or get aftermarket rods.

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does anybody have specs and pics of both the cranks. like size of main journals, crank journals ect. ect.

I have a crank in my garage I can take a picture of.

The specs are in the repair manuals.

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which crank you have (4ag or 7af)?

i will get a manual of both engines when i get a chance. i have a 7afe engine soafter my shop is built this summer i will take the engine apart to inspect it.

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ok just finished looking at both engine specs. i now see that the two heads are not the only differents, the block has some differents also. as said before the 4age has a crank size of 77mm and the 7afe has a crank size of 85.5mm. looking at the 4age engine with will require grinding on the block with a maximum stroke approaching 81~ 82mm. max. also the deck height on the 4age is 191mm and the 7age deck height is 206mm.

 

so thnks guys now i see.........

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which crank you have (4ag or 7af)?

i will get a manual of both engines when i get a chance. i have a 7afe engine soafter my shop is built this summer i will take the engine apart to inspect it.

I have dissassembled a 4A-FE engine (just to see the internals).

I have another bad 4A-FE engine in my yard I may take apart as well.

The car in my garage had a bad 7A-FE engine and I took it out and it is also in my yard.

I don't know which parts are good unless I do some measuring, but the broken parts I can tell pretty easily.

Anyone need any 1.6L engine parts?

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