EMPI Hi-Performance Dual Port Cylinder Head | VW Type 1 Aircooled | 90.5/92mm, SS Valves, 3-Angle (98-1374-B)
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EMPI Hi-Performance Dual Port Cylinder Head — 90.5/92mm Bore, Stainless Valves, 3-Angle Valve Job (98-1374-B)
The EMPI 98-1374-B is a Hi-Performance dual-port cylinder head for air-cooled VW Type 1 engines running 90.5mm or 92mm pistons (1776cc / 1835cc builds) in a Beetle, Bus, Karmann Ghia, Type 3 or Thing. It is the 98-1355-B casting machined for big bores, with stainless Manley valves (35.5mm intake / 32mm exhaust), hi-rev springs and a 3-angle valve job. Sold each.
Part numbers: EMPI 98-1374-B · based on EMPI 98-1355-B casting · UPC 707924472356
Fitment
| Years | Vehicle | Notes |
|---|---|---|
| Dual-port engines | VW Beetle | 90.5mm or 92mm bore (1776cc / 1835cc) |
| Dual-port engines | VW Bus | Dual-port performance builds |
| Dual-port engines | VW Karmann Ghia | Dual-port performance builds |
| Dual-port engines | VW Type 3 | Dual-port performance builds |
| Dual-port engines | VW Thing | Dual-port performance builds |
| — | Not confirmed | Stock 85.5mm or 94mm bore (use the matching-bore head), single-port engines, Type 4 engines |
Specifications
| Spec | Detail |
|---|---|
| Bore | 90.5mm / 92mm, dual-port casting (98-1355-B based) |
| Displacements | 1776cc (90.5mm) and 1835cc (92mm) builds |
| Valves | 35.5mm intake / 32mm exhaust, stainless Manley |
| Springs | Hi-rev single valve springs |
| Retainers / keepers | Chromoly retainers, hardened keepers |
| Valve guides | Bronze |
| Valve job | 3-angle performance |
| Chamber volume | 51cc |
| Intake port volume | 53cc |
| Exhaust port volume | 56.5cc |
| Spark plug thread | 14mm x 1/2" |
| Material | Special aluminum alloy, fully repairable |
| Competition | SCORE approved for Class 11 |
| Quantity | Sold each |
| Shipping dimensions | 12 x 9 x 7 in |
What's included
- One Hi-Performance dual-port cylinder head machined for 90.5/92mm (sold each)
Not included
- Lash caps (P/N 00-4006-0) — required with stainless valves, sold separately
Why it matters
Big-bore pistons need heads cut to match: a stock 85.5mm head will not accept 90.5mm or 92mm cylinders. This head is machined for 90.5/92mm and adds stainless valves and a stronger valvetrain without going to a full race head.
Installation notes
- Lash caps (P/N 00-4006-0) are required for all stainless steel valve applications — sold separately.
- Match the head to your bore: use the 85.5mm or 94mm version for those cylinder sizes.
Frequently Asked Questions
What bore is the EMPI 98-1374-B head machined for?
It is machined for 90.5mm and 92mm pistons.
What engine sizes does the EMPI 98-1374-B fit?
It suits 1776cc (90.5mm) and 1835cc (92mm) dual-port Type 1 builds.
Do I need lash caps with the 98-1374-B?
Yes. Lash caps (00-4006-0) are required with stainless valves and are sold separately.
Will the 98-1374-B fit a stock 85.5mm or a 94mm engine?
No. Stock 85.5mm and 94mm bores are not confirmed; use the matching-bore EMPI head.
Is the EMPI 98-1374-B sold each or as a pair?
It is sold each.
What is the part number and UPC?
EMPI 98-1374-B, UPC 707924472356.
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Prop 65 Warning
WARNING: This product can expose you to chemicals including lead which are known to the State of California to cause cancer and reproductive harm. For more information, go to www.P65Warnings.ca.gov. Wash hands following installation or before eating. All parts legal for use on pre-pollution controlled vehicles only.
