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    J.M.B Contracting

    5.0 (1 review)
    Closed 8:00 am - 5:00 pm

    Services - J.M.B Contracting

    Machine shops

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    4 years ago

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    Speed Specialties - 300zx 30p intakes ported by Speed Specialties. Sculpted to accept new-style lower intake

    Speed Specialties

    (1 review)

    In order to wring a bit more performance out of my 1993 300zx, I decided to port and upgrade my…read moreheads. The stock heads are already well built so I knew I had to find a high quality machine shop. I visited two other local shops at first but neither would inspect the heads or quote me a solid price for the work when I visited. Both also lacked experience in head porting. Another shop wouldn't even bother taking my calls or returning my emails. Speed Specialties really stepped up to take on the job. They even took the time to compare two similar castings right when I stopped by. Their shop is quite clean and materials are kept organized. After a couple weeks of constant porting, I was treated with some of the best looking ports I've ever seen. Then, the guys completed the 4+ way valve job with a precision valve cutting machine. They also installed some Ferrea valves, JWT valve springs, JWT mild cams, viton stem seals, and new lifters. Through the process, both Garys kept me in the loop. When finished with the work, they walked me through the entire process as well as how/where material was removed. After installing my heads, both aligned perfectly to the lower intake. A leak-down test revealed no leakage through the valves. The finished heads are more than quality products, they're precise, high performance works of art. I know where I'm taking my next engine projects. Great work!

    From the owner: We are a fully equiped machine shop with a in house DTS engine dyno. We are a custom engine…read morebuilder. Every engine is unique and special in their own way, to fit the owners needs. Boats, Drag, Dirt, Street Rod, number matching restoration. Specialized in powerful V8's We have 30 years of experience building race engines

    Automotive Machine & Supply - Sweeping  up the shavings after a busy day

    Automotive Machine & Supply

    (6 reviews)

    best place around fort worth in my opinion . excellent work and friendly. they take their time with…read moreyou explaining everything you need to know . highly recommend them

    Dropped off 2 PWC cylinders on JULY 20TH to be blasted, bored, honed, and decked. Was given an…read moreestimate that they would work on them AUG 11TH and should have them done mid to late Aug. Called them on AUG 23RD and was told they blasted them and should be a few more weeks. Ok, no big deal I understand delays happen. Called again multiple times in mid/late Sept and got the same response. I'm starting to get a little frustrated at this point. Called again beginning of October and the same thing "the tech is measuring them and we should know in the next few days what pistons you need, I will call you once I know more". By now boating season is wrapping up. Finally said screw it and drove to the shop and picked them up OCT 24TH. During the span of 3 months, I never received 1 call about the status of the work, delays, or any info. Clearly my business is not important to them so I decided to take it elsewhere. I've been more than patient and understanding about the delays, but at a certain point I'm tired of being lied to. If you're a racer or have a trip or some sort of hard deadline you need a project finished by, I'd recommend going elsewhere. Also, in regards to the media blasting that they did do, I was told the coolant passages would be cleaned out and cylinder looking like new. Still lots of paint and corrosion everywhere on the cylinders and coolant passages. Lack of attention to detail and care for the customer. Will never do business with them and do not recommend.

    J.M.B Contracting - machineshops - Updated May 2026

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