GT1R Spec ‘Pro Mod’ big bore piston set, 88mm stroke
GT1R Spec ‘Pro Mod’ big bore piston set, with rings and T1-spec DLC wrist pins.
Stroke: 88mm
Compression Height: 1.35
Dome Volume: +4.1cc
Bore Options
- 98.00mm
- 98.25mm
- 98.50mm
- 99.00mm
- 100.00mm
***Customer Service will reach out to you for bore size after ordering**
Details
Frequently Asked Questions About GT1R Spec ‘Pro Mod’ big bore piston set
Can I install these big bore pistons in a stock VR38 engine block?
No. These pistons start at a 98.00mm bore, which is significantly larger than the stock 95.5mm bore. You must utilize aftermarket iron sleeves or a billet block to accommodate these dimensions.
What is the advantage of the DLC wrist pins included in this set?
DLC (Diamond-Like Carbon) coating provides an extremely hard, low-friction surface. This prevents pin galling and reduces wear under the immense cylinder pressures generated in 'Pro Mod' style drag racing builds.
How do I specify which bore size I need when ordering?
You do not need to select the size in the cart. Simply place your order, and a T1 Race Development customer service representative will reach out to you directly to confirm your required bore size (98mm to 100mm).
Are these pistons designed for stroker crankshafts?
No, this specific set is engineered for the standard 88mm stroke. If you are using a stroker crank (like a 94.4mm), you would need a different piston with a modified compression height to avoid deck clearance issues.
What does the +4.1cc dome volume do for my engine?
A positive dome volume (+4.1cc) raises the compression ratio compared to a flat-top or dished piston. This design helps maximize thermal efficiency and off-boost response in high-performance racing engines.
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