Acme Speed Shop

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Acme Speed Shop MG-Triumph street/race engines, head porting, DIY engine rebuild kits, alloy wheels.

Hap, how are you going to set the fuel mixture on your street 1971 MGB's twin HS4 carbs, Unisyn, Colortune? Nah, like th...
10/05/2026

Hap, how are you going to set the fuel mixture on your street 1971 MGB's twin HS4 carbs, Unisyn, Colortune? Nah, like this.

OK, we've heard it all about AI, AI good, AI bad, yada, yada, yada. Ok how about AI Awesome? The first picture is a pict...
09/22/2026

OK, we've heard it all about AI, AI good, AI bad, yada, yada, yada. Ok how about AI Awesome? The first picture is a picture of my 71 MGB sitting in my shop, the second picture is my AI generated T shirt from that picture, with all the background removed and the car animated. Took my 30 seconds to make, the software does all the work, I think it was $26.95.
Here's where I got. https://www.shirrts.com/

And this is why I hate 1972-1980 MGB 18V cylinder heads. I keep telling people most all of them are cracked, and I swear...
09/16/2026

And this is why I hate 1972-1980 MGB 18V cylinder heads. I keep telling people most all of them are cracked, and I swear it falls on deaf ears. It's not like it will cause your car not to run. These cracks hardly ever breach water, so a pressure check is useless. No, what it means is it can never be properly rebuilt with hardened exhaust seat inserts, because that would spread the crack and compromise how well the seat insert is held in. Oh, and if the seat comes out, it is most likely game over for the engine. Most days I love my job, but days like this it suxs. So this is where most 18V heads end up, in the scrap metal barrel.

18V street performance build, assembly have begun.
08/26/2026

18V street performance build, assembly have begun.

This is what happens when you flirt too much with the push rod hole. It has been done many times by many head porters, s...
08/18/2026

This is what happens when you flirt too much with the push rod hole. It has been done many times by many head porters, sometimes on purpose to go as far you can go. However this MGA 1500/1600 cylinder head was already this way on a late 70s MGB street car. The ports openings were way bigger than they needed to be for a street car. The late MGB engine will get a fresh 12H2389 head core to port for it. However this head was too good to just toss. They had this head running with those push holes open which got some oil induction with fuel and air, for sure. So I plunged the push rod bores out to 5/8", and the ID of the push rod bore will be exactly the same ID as they were stock and this will be fully repaired. While they did a fairly good work opening the ports runners, there is much to do to the bowls. So this head will be repaired, fully ported, rebuilt and converted into a MGA race head, and live on to take on a new life on the track. I already cut the sleeves, but will wait to install them when the porting is finished. Turning chicken 💩 in to chicken salad, recycling old car style.😁

The whole kit and kabootle.MGB 12H1326 cylinder head, ported, and rebuilt, port matched intake manifold, and rebuilt roc...
08/14/2026

The whole kit and kabootle.
MGB 12H1326 cylinder head, ported, and rebuilt, port matched intake manifold, and rebuilt rocker arm assembly.

I used Cerakote ceramic high temp exhaust coating, air dry to coat my stainless steel LCB header, a stock exhaust manifo...
08/02/2026

I used Cerakote ceramic high temp exhaust coating, air dry to coat my stainless steel LCB header, a stock exhaust manifold, as well as my new muffler and resonator. I have used this product before on some race headers and found it to be long-lasting, cut down under the hood heat, and looks good long-term.

Another one, a 12H1326, ported and machine shop ready. Also did a ported matched twin HS4 intake manifold, and rebuilt t...
07/30/2026

Another one, a 12H1326, ported and machine shop ready. Also did a ported matched twin HS4 intake manifold, and rebuilt the rocker arm assembly. Now starting on a 1275.

I have collecting early MGB 12H1326 pre smog heads for race heads and early MGB projects over the years I have 2 of them...
07/17/2026

I have collecting early MGB 12H1326 pre smog heads for race heads and early MGB projects over the years I have 2 of them cleaned up, stripped down and cracked checked. They are virgin, as in never been resuraced. 450.00+ shipping. If you want me to rebuild it or port I can do that as well

Bullet in the chamber. 82.5mm Russell Engineering Pistons with Toltal Seal gapless rings. 1900cc.D9 Cam with Q-Parts ve...
07/13/2026

Bullet in the chamber.
82.5mm Russell Engineering Pistons with Toltal Seal gapless rings. 1900cc.
D9 Cam with Q-Parts vernier adjustable cam gear
Maxpeeding connecting rods
Forged flat crank balanced
Fidanza Aluminum flywheel with B&B HD pressure plate with an Exedy HD clutch disc
Pro Sport Harmonic balancer
Baffled oil pan
Aluminum back engine plate
12H2389 Cylinder head fully ported with 1.685" intake valve and 1.344" exhaust valves with Crane retainer.
10.0 to 1 compression ratio
Modified twin HS4 carbs with K&N cone air filters with MG intake, ported and matched the head.
SS LCB headers
123 distributor

Address

1 CAROLINE Drive
Taylors, SC
29687

Telephone

(864) 370-3000

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