99-up valves have very strange specs:
valves 46.5 degrees
seats 44.5 degrees
How can it seal if there is 2 degrees difference?
More important question: can I cut seats with 45 degrees cutter?
What are 99-up and 98-down valve diameters?
Thanks.
Valve/valve seat angle?
-
car5car
- Posts: 1
- Joined: November 27th, 2024, 7:25 am
- Vehicle Year: 2000
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
-
Cheromaniac
- I live here
- Posts: 3292
- Joined: March 8th, 2008, 12:58 pm
- Stroker Displacement: 4563cc
- Vehicle Year: 1992
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
- Location: Cyprus
Re: Valve/valve seat angle?
1.91" intake, 1.50" exhaust
1992 XJ 4.6L Poor Man's Stroker - 5MT - 246hp & 311lbft (crank) - Sold 
Stroker Build Stroker Recipes
Stroker Build Stroker Recipes
-
75SV!
- Noob
- Posts: 18
- Joined: January 11th, 2024, 4:07 am
- Stroker Displacement: 4.6
- Vehicle Year: 2000
- Vehicle Make: Jeep
- Vehicle Model: XJ
Re: Valve/valve seat angle?
The different angles helps seal on the outer edge. I had the heads on my LS 5.3 for my Chevy Avalanche done to 37 degrees. The guy doing the set of heads said something like 37 degrees and 38 degrees. I did do 30 degrees to a couple of '99 4.0L heads.