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Selected: 20773-20-EA
+.020" oversize piston
Also used in big bore 948cc engines
Part No:
20773-20-EA
Internet Price
$189.95
Select variations below for more information:
If you are looking for great longevity from your 998cc engine, these 4-ring dished pistons could be the best answer at rebuild time. Compression 9:1. Nural brand, circlip type.
Question:
Looking to purchase these for my 59 Bugeye. A couple of questions:
- What size is the required bore for these pistons?
- Can I retain the stock 948 connecting rods?
- Are there any other modifications required to run with these?
- Are there any suggested modifications?
Answer:
Going from the 948 to the 998 +.020" should be fine. The 948cc piston is 2.4775", the 998cc pistons are 2.5420" and 998cc +.020 =2.562". The rods are the same, the pin height for both pistons is the same (1.342").
The change represents taking a 948 block and boring it +.0845" over (from standard).
We would suggest getting larger valves in the head to take advantage of the larger displacement. If you could find a 12G206 or 12G295 head - those have larger intake valves - or just go to the large intake valves in your head. That plus more of a street camshaft and maybe a header and exhaust and you'd be good to go.
The change represents taking a 948 block and boring it +.0845" over (from standard).
We would suggest getting larger valves in the head to take advantage of the larger displacement. If you could find a 12G206 or 12G295 head - those have larger intake valves - or just go to the large intake valves in your head. That plus more of a street camshaft and maybe a header and exhaust and you'd be good to go.
Spridget Mania Tech Team
The Spridget Parts and Accessories Experts
If you are looking for great longevity from your 998cc engine, these 4-ring dished pistons could be the best answer at rebuild time. Compression 9:1. Nural brand, circlip type.
Question:
Looking to purchase these for my 59 Bugeye. A couple of questions:
- What size is the required bore for these pistons?
- Can I retain the stock 948 connecting rods?
- Are there any other modifications required to run with these?
- Are there any suggested modifications?
Answer:
Going from the 948 to the 998 +.020" should be fine. The 948cc piston is 2.4775", the 998cc pistons are 2.5420" and 998cc +.020 =2.562". The rods are the same, the pin height for both pistons is the same (1.342").
The change represents taking a 948 block and boring it +.0845" over (from standard).
We would suggest getting larger valves in the head to take advantage of the larger displacement. If you could find a 12G206 or 12G295 head - those have larger intake valves - or just go to the large intake valves in your head. That plus more of a street camshaft and maybe a header and exhaust and you'd be good to go.
The change represents taking a 948 block and boring it +.0845" over (from standard).
We would suggest getting larger valves in the head to take advantage of the larger displacement. If you could find a 12G206 or 12G295 head - those have larger intake valves - or just go to the large intake valves in your head. That plus more of a street camshaft and maybe a header and exhaust and you'd be good to go.
Spridget Mania Tech Team
The Spridget Parts and Accessories Experts
Also Purchased with: 20773-20-EA
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