243 heads, upgrading valves
#1
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243 heads, upgrading valves
I have some stock 243 heads I'm gonna throw on, but am thinking about getting some larger valves before I put them in.
Any issues with that? Will it hurt more than help? not matter? eh?
thanks in advance.
Any issues with that? Will it hurt more than help? not matter? eh?
thanks in advance.
#2
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The heads are stock?
Porting the heads with stock valves will gain more power than a stock head with only larger valves.
IMO, this is the order in which youll gain teh most power:
1. Porting the heads
2. Milling for proper compression
3. Larger valves
4. 5 angle vs. stock 3 angle valve job
Id spend the money on the first two before touching the valves.
Porting the heads with stock valves will gain more power than a stock head with only larger valves.
IMO, this is the order in which youll gain teh most power:
1. Porting the heads
2. Milling for proper compression
3. Larger valves
4. 5 angle vs. stock 3 angle valve job
Id spend the money on the first two before touching the valves.
#4
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Originally Posted by dubrado
so larger valves = good w/o any issues on stock heads
I'm gonna be porting them at home a little
I'm gonna be porting them at home a little
#5
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Originally Posted by GuitsBoy
Yeah, youll have to get the seats cut and possibly even replaced though. Then a valve job. And IMO, porting and milling yield larger gains.
2.04 would fit but pointless since seats are 2.02
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#8
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Originally Posted by dubrado
do you need a valve job w.the 2.02 and 1.57's?
Like predator said, you can reuse the seats for .020 over valves, but theyll still have to be cut.
#11
Originally Posted by GuitsBoy
The heads are stock?
Porting the heads with stock valves will gain more power than a stock head with only larger valves.
IMO, this is the order in which youll gain teh most power:
1. Porting the heads
2. Milling for proper compression
3. Larger valves
4. 5 angle vs. stock 3 angle valve job
Id spend the money on the first two before touching the valves.
Porting the heads with stock valves will gain more power than a stock head with only larger valves.
IMO, this is the order in which youll gain teh most power:
1. Porting the heads
2. Milling for proper compression
3. Larger valves
4. 5 angle vs. stock 3 angle valve job
Id spend the money on the first two before touching the valves.
1. What is "proper compression"? I always use 93 octane, but if I'm on a trip and it's not available...
2. Where would you send the heads to to get them CNC'd and milled?
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If this is staying internally stock (oem cam, etc) then some "cleaned" 243 heads will bring a good overall gain. I would persoanlly wait until you have the 243 heads, as they have a little more compression due to the smaller combustion chambers. The port runners are bigger and better flowing versus your current heads. Unless you are going a much bigger cam, these would more than help.
If you determine in a year that you want to really bump the HP, then you need a preoven matched cam/head combination.
If you determine in a year that you want to really bump the HP, then you need a preoven matched cam/head combination.