Welcome To
Altered Machine and Design is myself; Greg Wahl. I have obtained a Red Seal Endorsement as a Machinist as well as a Toolmaker with 35 plus years of experience operating precision machine tools. I have owned my T-type for over 6 years making many parts for it. My passion for Turbo Buicks and my experience has led me to machining throttle bodies and plenums for the LC2 engines. After receiving your Altered throttle body please share your impressions of my work with others. Thanks in advance!
01
Throttle Body Service
Check out the steps below for my Throttle Body Service.
Step 1. Throttle Body:
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- Remachine surfaces: vacuum, IAC and flange
- 8° taper leading to 62mm bore
- Spotface holes x 2
- Counterbore gasket pocket
- Ream and install new shaft seals
2. Plenum:
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- 62mm Bore
- Counterbore gasket pocket
- Spotface holes x 5
- EGR structure removed*
- Remachine Throttle Body flange surface
*place a zip tie on EGR structure if you wish to keep it!
3. Shaft:
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- True half-shaft modification (symmetrical profile)
- Slot detailing to accept larger throttle plate
- New Stainless fasteners
4. Throttle Plate:
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- .063″ thick brass (.050″ factory)
- Machined at a 7° angle for smooth off idle response
- Every Throttle Plate is machined to suit Throttle Body bore size
5. ACETAL GASKET:
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- 3 sided sealing gasket
- Ensures port alignment of components
- Every Acetal Gasket is machined to suit counterbored gasket pockets
6. SHAFT SEALS:
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- Throttle body is reamed to accept new shaft seals
- North American seals are used
7. Final Assembly:
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- All parts are deburred and cleaned
- Throttle plate is fitted to throttle body
- Shaft seals installed with small amount of gasket maker
- Small amount of RTV is applied to flange surfaces
- Loctite BLUE is used on shaft fasteners
- Threads are chased and cleaned
- Shipped ready to install
02
Ready To Order
Important Pre-shipping Requirements:
I do NOT clean or paint throttle bodies!!! PLEASE ship your throttle body and plenum as if you were to install it on the intake. Paint, polish or powder coat before shipping. I do NOT machine plated parts due to chipping! Slight over spay is not an issue as surfaces will be machined during service. You will need to send the following parts:
- throttle body
- plenum
- shaft and retaining plate
- M8 studs and nuts to secure parts together
Disassembly Instructions:
- Screws holding plate to shaft will need to be filed down as they were “upset” at the factory. They should unscrew easily, do not damage your shaft buy forcing them out!!!
- Shaft should slide out of the throttle body; do not force it out!!! Deburring slot and tapped holes will free it up.
- Box it up with bubble wrap and packing chips, hopefully I can reuse your materials for return shipping.
When properly prepared and ready to ship please send to this address:
119 – 5954 200th Street
Langley, British Columbia
Canada
V3A 1N3
