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12º / 14º 632 Nitrous Series Flat Top

Specifically designed for Nitrous-fed 632 engines using aluminum rods. Valve reliefs 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 3/16 oil rings. Compression distance and compression ratio calculated with -.025" 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
12º / 14º 632 Flat Top Nitrous Series
Std Bore: Aftermarket Race Block 4.600
Ring package designed for: .043 BACKCUT, .043 D-wall, 3/16" Rings

Click here to see matching JE Pro Seal Head Gaskets!

Tech and Installation Tips
Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
65cc 70cc 77cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
293518 632 4.600 4.750 6.660 10.175 1.140 15.2 14.5 13.6 -7.3 582 B STD JG7308-4600-5
293519 634 4.610 4.750 6.660 10.175 1.140 15.3 14.5 13.6 -7.3 585 B,M 0.010 JG7308-4610-5
293520 638 4.625 4.750 6.660 10.175 1.140 15.4 14.6 13.7 -7.3 590 B,M 0.025 JG7308-4625-5

- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.


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