Chamber progression...

this head is sold

And what looks to be a new longitudinal RWD manifold......

link: https://www.aeu86.org/forum/attachment.php?aid=17723

And what looks to be a new longitudinal RWD manifold......

link: https://www.aeu86.org/forum/attachment.php?aid=17723

https://toyotagazooracing.com/pressrelease/2025/0910-01 Note redesign rear drain, and all cam caps doweled(bulge). https://toyotagazooracing.com/-/media/TMC/tgr/global/contents/pressrelease/images/2025/0910-01/0910-01_02.jpg block (too big for Club4ag): https://toyotagazooracing.com/-/media/TMC/tgr/...

https://gallery.ostportworks.com/albums/userpics/10005/normal_ost-118.jpg So up for sale is OST-118, a 1st gen 4AGE head in very nice condition. Price is $1400 + a good core, OR $1650 outright. Porting includes blending/aligning the bowls to their seats, deshrouding the combustion chambers and re-t...

OST-114 is SOLD

We had one, our biggest complaint - poor load capability... mostly do to its shape. We couldn't get much to fit in the back...... it also wasn't that efficient. It also doesn't use trailing track rods (like an AE86) to locate the front wheels, the track rods hold it in place from the rear, and this ...

If I swap injectors wouldn't I also need a bigger fuel pump? I'm actually not sure what the flow rate of the stock one is. Stock replacement fuel pump(from Walbro) is 80 lph - unsure of what the OEM one's actual volume is.... I'm pretty sure(albeit not knowing) you can get away with a bit more inje...

Grant wrote:Just posting to pay my respects. I'm sure a lot of knowledge around the A series engines we still use today came from building engines at that shop.

What's the story behind the engine in that picture?

That is my smallport from Surreptitious, Loynings built my engine

That looks pretty good! Other than the TVIS dip, the torque looks good. Yea I'm pretty happy with it. What do you think about the AFR? How much better could I get it running with a tunable ECU? The Poncams should make power over 7000 rpm... If you go again, I'd have the dyno operator to make the pu...

That looks pretty good! Other than the TVIS dip, the torque looks good.

https://gallery.ostportworks.com/albums/userpics/10005/ost-114.jpg OST-114 is a race prepared smallport head. It has had extra clearance (end mill) added to the follower(bucket) bores, and it has been fitted with Supertech valve guides. https://gallery.ostportworks.com/albums/userpics/10005/race_mo...

Arnie passed away April 4th 2025.... a sad day. He and his crew at Loynings Engine Service built some of the most powerful "A" series engines in existence. https://scontent.fhio2-1.fna.fbcdn.net/v/t39.30808-6/489532432_981578480769817_238906565653087233_n.jpg?stp=dst-jpg_s600x600_tt6&_...

Nothing wrong with a "mild" 150hp 4AGE. There is something to be said for stuffing your foot into it, smiling, and not getting a ticket.

"I'm also planning to find a local shop with a dyno to get some baseline numbers for horsepower/torque. I have no plans for aftermarket engine management yet, but I'm interested to see what this engine is actually putting out. "

as am I...

I believe these are also different. For one, the taillamps use different harnesses, and different taillamps.

yes, significant. US models used an air flow meter to set fuel flow, while the JDM models used manifold pressure(vacuum) to set fuel flow. Completely different systems.

Wow... it's been a year... but somethings never change, and again track season is around the corner....... I've got a finished largeport (OST-113) ready for a new owner. This head build is for a stock, to moderate build utilizing cams from stock duration up to 272, with lifts of upto 9mm. Later this...

Gottcchaaaa... Very good to know! I think I might be okay since my cams aren't as aggressive as your poncams from a degree standpoint. I had Dan (oldskewltoy) source me some Cat 244 / 8mm lift cams. What compression ratio pistons did you get? I'd be very curious to see what kind of numbers you will...

I can buy a 20v silvertop head quite cheaply to try, do you know if there is any truth in coolant passages not aligning correctly with 16v engine blocks? l thought all of the later blocks were the same. as far as I know the only issue with using a 20V block is one of the cast reinforcements (with /...

bigport manifolds are quite restrictive - especially just above the bend. Even without TVIS I don't believe it flow as much as the smallport manifold. The 20V is likely got the best potential as far as capable intake flow. The Silvertop head has 36cc chamber volume same as the 16V heads, while the B...

should be interesting to follow if nothing else........

pretty sure one of my client's attempted to use them.... but they ended up having to go back to OEM. Something about the breather

BC springs are good for 11mm of lift and fit in the stock spring seats. I've checked - https://www.club4ag.com/forums/viewtopic.php?t=15683&start=30#p104740 I don't run the engine past 8200 rpm do you think those springs would cope ok? (Re. the comment about 7MG quality in the post) Engine uses...

BC springs are good for 11mm of lift and fit in the stock spring seats.

I've checked - viewtopic.php?t=15683&start=30#p104740

one problem with stroker kits, you tend to lose crankshaft strength because you lose journal overlap.

and packed in a 4 mil bag keeping it clean

Thanks for the pics. WOW, that spring comp., you've spent a LOTTA time with it even if you do the removal with a hammer & socket! Weld a nut & use your drill?? / Also, a nicer surface might increase its sellability. The surface has been machined... .004". I'll get a photo tomorrow........

For sale: OST-105, a 2nd gen standard valve bigport head. Fully ported, and rebuilt using new viton rubber valve seals, and BC valves springs (good for cams with upto 10mm of lift) $1300 + shipping - NO CORE REQUIRED https://gallery.ostportworks.com/albums/userpics/10005/normal_ost-105.jpg nicely po...