rhs ls7 frankenstein racing heads 4

Truly one of a kind, the RHS LS7 casting features a unique raised runner design that still utilizes the stock manifolds for never before seen bolt-on performance. The raised runner design provides a much better transition into the chamber than traditional designs, and when coupled with an efficient, fast-burn style chamber, radically increases volumetric efficiency. To deal with all of that power potential, RHS incorporated a super strong deck structure and 6-bolt casting design that prevents the head from moving around under load in high HP applications.

Our port design for this head was inspired by extensive research on the track and on the dyno. By employing proper cross sectional area and port velocity while not being overly concerned with flow numbers, we are able to make far more power in real world conditions than the competition. For the ultimate performance advantage over the competition while still maintaining a budget, there is no better choice than the FRH RHS LS7.

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Intake Volume       284cc/308cc

Exhaust   Volume     100cc

Chamber Volume     60-70cc  

Intake Flow (2.250" Valve)      

311cfm @ .400”            

421cfm @ .800”

Exhaust Flow (1.610" Valve)   

208cfm @ .400”        

262cfm @ .800”  

PAC 1207X kit good for .700" lift (solid roller option available) 

Intake Valve Diameter    2.200” -  2.260"

Intake Seat Material    Ductile Iron (alloy upgrade available)

Exhaust Valve Diameter    1.610"

Exhaust Seat Material    Ductile Iron (alloy upgrade available)

Valve Angle      12⁰

Valve Guide Material    Bronze Alloy  

Minimum Bore Size    4.125”



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