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Original Message
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| Nope. Valve spacing is the same. |
| By Dave Shoe - 10/24/2002 12:33:06 AM; IP 67.4.132.3 |
The CJ valves should work just fin in a standard bore 390 with CJ valved FE heads.
To be sure, the CJ was cast to fit the standard FE valves, but were machined on the production line to fit the larger valves.
It's always a good idea to check clearances, especially if you have a higher lift cam. It's actually good to check every cylinder, due to notable cylinder-to-cylinder positioning variances in both the head and block.
Just stick the head on a bare block and shine the flashlight up through the cranksaddles to view clearances.
With CJ intakes and exhausts in that head, you'll likely outflow a CJ head by just a little, as the early heads did not have the Thermactor bumps to flow around.
Another nice thing about increasing the valve size is the valves will sit higher on their seats (closer to the piston) because stock seats have likely been worn into the head a bit as the years, and the valve grinds, have taken metal away.
Sounds like a great Galaxie or truck application.
Shoe. |
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