Solid Lifter Adjustment

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Valve lash specifications for all hi-performance Mustangs with solid lifter cam.

When adjusting solid lifters with the engine off, there are three crankshaft positions for adjusting sets of valves. Six valves are adjusted at Position A, four at Position B and six at Position C.

Please click on drawing for various positions

Valve Lash Specifications:

Engine

INT.

EXH.

289 Hi-Po

.018H

.018H

302 Boss

.025H

.025H

429 Boss

.013C

.013C

351 Boss & HO

.022C

.022C

429 SCJ

.019H

.019H

Note: "H" for valve lash stands for hot and "C" stands for cold. For setting the engine hot, the engine should be run until it reaches normal operating temperature. For cold settings, park the car overnight.

289 High Performance, Boss 302, Boss 429, 429 Super Cobra Jet

Position A:

No. 1 intake

No. 1 exhaust

 

No. 7 intake

No. 5 exhaust

 

No. 8 intake

No. 4 exhaust

Position B:

No. 5 intake

No. 2 exhaust

 

No. 4 intake

No. 6 exhaust

Position C:

No. 2 intake

No. 7 exhaust

 

No. 3 intake

No. 3 exhaust

 

No. 6 intake

No. 8 exhaust

         

Because of their unique firing order, the valve sequence on the 351 engines differs from the other Ford solid lifter engines. 

Boss 351, 351 HO

Position A:

No. 1 intake

No. 1 exhaust

 

No. 4 intake

No. 3 exhaust

 

No. 8 intake

No. 7 exhaust

Position B:

No. 3 intake

No. 2 exhaust

 

No. 7 intake

No. 6 exhaust

Position C:

No. 2 intake

No. 4 exhaust

 

No. 5 intake

No. 5 exhaust

 

No. 6 intake

No. 8 exhaust

 

 

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