so I have heard that using the 7afe headgasket on a 4af/4afe motor will increase the compression. Any reason I shouldn't do this? Anything extra I will have to do rather than just put it in like the 4af one?
yeah but it's meant for the A block, so I can't see why it wouldn't work. It was suggested the last time I did the headgasket. It's also an easy way to get a little more compression out of it which is cool since I plan to stay N/A
I dont think the 4A and 7A head gaskets are different. Even if they are, the change is so minute there isnt going to be gains there. Think about something else to increase compression. Like pistons.
ugh you missed the point, even if it's small and almost pointless... I have to replace the headgasket anyways, where as I don't need to replace the pistions
it was a few guys on here that told me the 7a headgasket is thinner than the 4a ones.
if it's more expensive than the $40 4a headgasket then screw that, but if it's the same price and increases the compression even just a little and does no harm, walla I'll do it
thinner yes.. 4A-F gasket is 1.5mm, the 7A-FE gasket is I think 1.25mm, really drastic difference we got there. I mean sure, change it with the thinner one, but dont expect to feel the difference anywhere.
When you change the gasket, have the head skimmed also.
well I am planning on doing what you suggested. Putting the newer 4afe head on my block, only thing I can't remember is if you said my intake manifold would fit or not.
Won't be for another few months since I won't have the cash to have the head cleaned and redone when I do the headgasket this month
wow, this is all very intersting, i honestly nevery realized you were still sporting the 4af!
i don't the gasket is worth the trouble however this head swap interests me!
i have the 91'4afe in a dx sedan im working on and my mom's got an older 87' ae92 with the 4af i never thought to just replace the head to efi can you ellaborate?
your ideas always intrigue me freakinbox!
its not a new idea, we've been doing 3S/4A head swaps all the time here. Its not exactly as easy as A-B-C, but its not that hard either. One thing you have to remember is that the new and old 4A-FE have different timingbelts aswell...
Easiest is ofcourse a swap between the same generation engines.
so I have heard that using the 7afe headgasket on a 4af/4afe motor will increase the compression. Any reason I shouldn't do this? Anything extra I will have to do rather than just put it in like the 4af one?
I'd do it I did the same thing on my 4AGE, I had to replace the HG anyways, so I bought a .8mm one instead of a OE spec 1.0mm one for the same price. Couldn't hurt, was my philosophy as well
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
ToyotaNation.com is an independent Toyota/Lexus enthusiast website. ToyotaNation.com is not sponsored by or in any way affiliated with Toyota Motor Sales, USA, Inc. The Toyota, Lexus and Scion names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.
I did the same thing on my 4AGE, I had to replace the HG anyways, so I bought a .8mm one instead of a OE spec 1.0mm one for the same price. Couldn't hurt, was my philosophy as well 
Linear Mode
