12º / 14º 632 Flat Top
Specifically designed for Naturally Aspirated 632 engines to fit the following cylinder heads: 12º Raptor, 12º Pro-Filer, Dart Big Chief 14º (program #'s 3815 & 384), Sonny Tru-Pro 14.5º, and Brodix PB1200. Precision CNC machined ring grooves are designed for .043 back-cut top rings, .043 D-wall 2nd rings, and 3.0mm oil rings. Compression distance and compression ratio calculated with zero deck clearance at listed block height.
Includes:
Pin #990-2930-18-51S (174g)
Double spiro locks (#990-042-CS) Rail Supports(# 4600-203)
Double Forced Pin Oilers, Accumulator Grooves, and Vertical gas ports for maximum top ring seal
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12º / 14º 632 Flat Top
Std Bore: Aftermarket Race Block 4.600
Ring package designed for: .043 BACKCUT, .043 D-wall, 3.0mm Rings
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| Part # |
CID |
Bore |
Stroke |
Rod
Lgth. |
Block
Ht. |
Comp.
Ht. |
| Head Cubic Centimeters |
| 65cc |
70cc |
77cc |
| Compression Ratio |
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Dome
Vol. |
Gram
Wt. |
Footnote |
Oversize |
Recom.
Ring Set |
 |
| 280263 |
632 |
4.600 |
4.750 |
6.700 |
10.195 |
1.120 |
16.4 |
15.5 |
14.5 |
-7.3 |
575 |
B |
STD |
J77008-4600-5 |
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| 280265 |
634 |
4.610 |
4.750 |
6.700 |
10.195 |
1.120 |
16.5 |
15.6 |
14.5 |
-7.3 |
578 |
B |
0.010 |
J77008-4610-5 |
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| 280266 |
638 |
4.625 |
4.750 |
6.700 |
10.195 |
1.120 |
16.5 |
15.7 |
14.6 |
-7.3 |
583 |
B |
0.025 |
J77008-4625-5 |
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Tech and Installation Tips
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Valve Relief Diagram
- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.