My new project - Toyota Nation Forum : Toyota Car and Truck Forums

midnightmach · 09-03-2009, 05:23 PM

I got a 4age 20v head

, its going on a 7a block. This whole project is a big learning process for me so i need all the help i can get.

This is the only piece i have so far, i should be picking up a 7a bottom end soon.

The wiring harness is a mess, and looks like it's going to be a major pita.

I have a couple inital questions.

1. What head gasket do you recommend?
2. Is it ok to use 7a pistons?

daviidsjdmx · 09-03-2009, 06:03 PM

subscribed

iToaster · 09-03-2009, 08:29 PM

A 7AFE or 4AGE head gasket should suffice. The 4AGE pistons will be easier to use as you will know the compression ration instead trying to figure out what you'd get with with the 7A's pistons. It'll be very difficult to get this going, count on a programmable ECU and a lot of unique parts (the timing belt that fits the 7AGE comes from a Porsche of some kind), but if you put a lot of effort into it you'll be smiling every time you start your car. That said, good luck, I'll be watching your progress.

Bitter · 09-03-2009, 09:00 PM

http://www.6gc.net/forums/index.php?showtopic=68083 talk to him.

midnightmach · 09-04-2009, 12:02 AM

Quote:

Originally Posted by iToaster

A 7AFE or 4AGE head gasket should suffice. The 4AGE pistons will be easier to use as you will know the compression ration instead trying to figure out what you'd get with with the 7A's pistons. It'll be very difficult to get this going, count on a programmable ECU and a lot of unique parts (the timing belt that fits the 7AGE comes from a Porsche of some kind), but if you put a lot of effort into it you'll be smiling every time you start your car. That said, good luck, I'll be watching your progress.

I've heard alot of people get low compression thats why i want to get the right head gasket the first time.

If i come across a set ill most likey get them, the problem is finding 4age 20v pistons. I've heard using the 7a pistons with the 16v head works fine. Yea i've read to use a porsche 924 belt.

Its difficult to find consistent reliable information on the 7age... everyone says something different.

Quote:

Originally Posted by Bitter

http://www.6gc.net/forums/index.php?showtopic=68083 talk to him.

most definitely, thanks for posting that

Rip The E Brake · 09-04-2009, 02:07 AM

If your gonna replace the headgasket, double it up with a SUPER thick one, just incase you get a wild hair up your ass to boost it, you don't have to rebuilt it all again with larger gaskets.

daviidsjdmx · 09-04-2009, 11:11 AM

ohh yea when you do the build, please take alot of pics! i love pics lol

midnightmach · 09-13-2009, 04:01 PM

Who said they wanted pics?

Bad bearings

thin indeed, rods will be shot peened

Piston side

Needs to be machined, rough journals

7a Block

The 20v

Bitter · 09-13-2009, 04:06 PM

iirc some honda pistons fit the 7a block with a 70 over bore and give a good compression ratio and are also dirt cheap.

theres a whole thread i think here in the 6th gen forum maybe?

midnightmach · 09-13-2009, 04:29 PM

Quote:

Originally Posted by Bitter

iirc some honda pistons fit the 7a block with a 70 over bore and give a good compression ratio and are also dirt cheap.

theres a whole thread i think here in the 6th gen forum maybe?

yea ive read that somewhere as well, but i dont think anyone has actually tried it. I think it was a B18