4A-F head questions? - Toyota Nation Forum : Toyota Car and Truck Forums

White89SR5 · 11-23-2005, 11:47 PM

Does anyone kow the differences (if any) from year to year on the 4A-F heads? I bascially wanted to know if any one year head flowed better than others or maybe there was a year with a set of cams that was a little more aggressive then other years? I don't know how often it happens with Toyota, but I know of a few mtors that it happens with in the Nissan camp. I figure if there are better years than others then there might be a cheap and quick upgrade!!

Any info would be great!!

Flashmn · 11-24-2005, 12:39 AM

Yes, the 2nd gen 4A-FE head flows better and provides a better start off for tuning.

94_Rolla_Guy · 11-24-2005, 12:44 AM

among the 93-97's theres some possible cam swaps i will try to find the specs in my service manual

White89SR5 · 11-24-2005, 02:02 PM

This may be a dumb question, but I thought there were some difference between the 4A-F and the 4A-FE heads that keep them from being interchangable. Is this true? Let me know about those cam specs!! Thanks alot for the input!!

Flashmn · 11-24-2005, 02:38 PM

No they're swappable, the 1st gen 4A-F is worse than the 2nd gen 4A-FE.

White89SR5 · 11-24-2005, 02:42 PM

So I should only have to swap the intake manifold and vacum lines it should work right?

Flashmn · 11-24-2005, 03:40 PM

well the 2nd gen intake manifold wont fit a 1st gen head and vice versa. You might have to do some customizing.

White89SR5 · 11-24-2005, 04:56 PM

What are the differences the keep the 1st gen. intake from fitting te 2ng gen head?

Flashmn · 11-24-2005, 05:19 PM

Well the whole intake is different, and its at a different angle.

White89SR5 · 11-24-2005, 05:49 PM

I knew the whole manifold is different I just wanted to now what stopped it from bolting on. i.e. different hole pattern, to tall or short and things like that!

Flashmn · 11-25-2005, 05:18 AM

different bolt pattern, different shaped intake runners.

aaron7 · 11-28-2005, 02:42 PM

So you mean I can squeeze a little more out of my SR5? I'd like to get a different head that's been rebuilt and put it on!

It's an 89 SR5 4af. Sounds like if I swap the head I need to swap the intake, but wasn't 1989 the last year of the carb motor?

White89SR5 · 11-28-2005, 05:29 PM

Yeah the 89 was the last year of the carb thats why you would have to swap intake manifolds so the carb set up would work. I am going to going to the junkyard soon to get 4a-fe head to see what changes need to be made to make the setup work. I am also looking for the shop manuals of all the years of the 4a-f(e) to see if there could possible be a cam swap in there somewhere as well!! I am having a hard time locating all of the manuals so, it would be great if everyone that has a manual could let me know the specs on the cams so I could compile a list and see what years are better than others!! I was also thinking maybe the 7a-fe cams might be a possiblilty!!