7AFE head into an '89 4AF block help please - Toyota Nation Forum : Toyota Car and Truck Forums

|PuNiSh3R| · 03-02-2004, 01:01 PM

I just need to be doubly sure before I go and pick up the 7AFE head that it will fall right into place on an '88 4AF or '89 4AF(E) or '90 4AF(E)... I want to get a late model 4AFE block because they are 7 rib.. so please if anyone has info on doing the headswap.. I gotta know quick.

Jzs147-RR · 03-02-2004, 01:20 PM

Should bolt right on but the compression ratio might change and your not getting any power out of that head.

NDR008 · 03-02-2004, 02:21 PM

I am not sure about the A-, but i would have thought the block of the 7A is what you need and the head of the 4A, coz when people create a 5E-FTE hybrid, they take the 5E's lower engine block for the larger stroke, and the head of the 4E for the FTE part.
Unfortenatly I donno about 4As and stuff as much as the 4Es, but as Jzs... said, prolly bolts, but prolly is silly to do so.

|PuNiSh3R| · 03-02-2004, 03:09 PM

Ok.. and I will get a slight bit more power because of the different intake porting.. Won't exactly GIVE me more power but it will allow for a better intake flow. The CR of both engines is 9.5 and I am going to have the head re-surfaced to give me a 9.9-1 CR .. nothing big... and I am having the block over-bored .020, crank polished and balanced.. rods polished and checked for perfection.. valve job.. including 3 angle of course.. etc.. I'd put in a 7A.. but idk.. What do you guys think about swapping my 4AF out and dropping in a 7AFE (except I would put my quad carbies on it).. should be really easy to do.. just drop in the new engine and it'll use the exact same engine mounts and everything right? Just have to get my exhaust manifold made longer right?

Jzs147-RR · 03-02-2004, 03:14 PM

I think a nice 7afe would be a nice swap but a 7age would be better.If you are running carbs why not use the 4age head and 7afe block ?BTW I have 3 spare bluetop heads for sale if you ever need.Exhaust side should still fit even with the higher deck hight.

|PuNiSh3R| · 03-02-2004, 04:51 PM

Problem is is i spent 500 bux on my cams.. and if I do anything 4AGE or 7age whatever those cams will be useless to me

toyotaspeed90 · 03-02-2004, 04:53 PM

they will be worth the amount you can sell/trade them for

trust me... the 4age is definately worth it

|PuNiSh3R| · 03-02-2004, 04:59 PM

well if i just did a 7afe swap i'd get a lot more torque from the long block.. plus i could run my cams.. how is the ignition setup on the 7afe? like dizzy wise..? anybody got pics of one or somethin?

|PuNiSh3R| · 03-02-2004, 09:00 PM

Hey guys.. what about a 4AGE block with the 7AFE head.. this way I can still use my cams.. ???

toyotaspeed90 · 03-02-2004, 10:01 PM

you could do that.... you would have more strength.... but the block is heavier... and if you use a 4age windage tray you can rev a bit higher as well.....

the ignition setup on a 7a-fe is identical to a 4a-fe..... the ignitor/coil are built into the distributor... the ignitor isn't as big, but wires in the exact same....

|PuNiSh3R| · 03-02-2004, 10:21 PM

Ok, I think I just came to my final conclusion.. 7AFE engine swap.. complete swap.. The only things I need to worry about are (correct me if I am wrong):
Get my exhaust headers lengthened since the 7AFE is a long block
Rebuild the engine and head completely

That's about it.. right? The intake manifold flange is exactly the same, right? So I can use my existing 4AF custom intake manifold and bolt that right up to the 7AFE right? Same with the exhaust headers.. just need to get them lengthened..
THe engine will slap right into my tranny.. and the engine mounts.. right? Anything else?

Reason for doing this swap would be for this reason,
Being a long block (85.5mm stroke over the 4A blocks' 77mm stroke) is more torque right off the line.. slightly more power due to slightly more CC's and then with my larger cams I will have a good pick up with the top rpm band.. rightO?

How is the 7AFE in reliability though? I would have new pistons in it.. with those BendumMoly rings or whatever.. I'd have the head shaved to give me like 9.9 or 10:1 CR over the 9.5:1 CR (not that big of a jump I know.. I don't want it to big for the fact I'm cheap and don't want to have to fill up on anything higher than 89oct)
Over-bore the block for the new pistons and re-hone.. get the crank polished and checked for trueness along with the rods..

Sound good?

Jzs147-RR · 03-02-2004, 10:23 PM

Use a 7 rib 4age redtop block with high comp pistons and you will have a solid motor for high revs.The 7afe would be nice for torque but its weak and cant rev high for long periods due to small rods.But since your using stock computer go 7afe.