2.3" intake valves

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2.3" intake valves

Post  STR-LGL-70 on March 27th 2018, 7:06 am

Whats involved to install 2.3" intake valves in D00E-R heads? Will they fit with 1.76 exhausts?

Thanks, Sheldon
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Re: 2.3" intake valves

Post  dfree383 on March 27th 2018, 9:03 am

Need to reduce the exhaust valve down to 1.71 IMO

Not sure their is a giant power gain to be had in the 2.300 on the iron, need a lot of porting and the port may get sloppy on flow.
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Re: 2.3" intake valves

Post  STR-LGL-70 on March 27th 2018, 9:10 am

Thanks Dave,
Considering pulling an intake valve to see if they have a decent back cut on them and if not maybe go to 2.3" as well. Just gonna stay 2.25 if I have to change exhaust valves too.
SG
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Re: 2.3" intake valves

Post  rmcomprandy on March 27th 2018, 9:21 am

In my opinion, the 2.300" intake & 1.71" exhaust is the best alternative for power in the iron Cobra Jet heads.

Especially when installing hard exhaust seats in 'em.

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Re: 2.3" intake valves

Post  STR-LGL-70 on March 27th 2018, 11:11 am

I've had all seats & guides replaced due to having some repair done that required welding on 1 exhaust port in ea head. There was some porosity in the left side port wall of # 4 & #5, the same place in each head that was leaking into the exhaust ports, all good now. Does reducing from 1.76 to smaller 1.71 valves sink the valves too much when cutting new seats? Can 2.3" intake valves be done by just cutting the seats larger?
Thanks,Sheldon
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Re: 2.3" intake valves

Post  rmcomprandy on March 27th 2018, 8:42 pm

STR-LGL-70 wrote:I've had all seats & guides replaced due to having some repair done that required welding on 1 exhaust port in ea head. There was some porosity in the left side port wall of # 4 & #5, the same place in each head that was leaking into the exhaust ports, all good now. Does reducing from 1.76 to smaller 1.71 valves sink the valves too much when cutting new seats? Can 2.3" intake valves be done by just cutting the seats larger?
Thanks,Sheldon

Seat the valves at 50 degrees and the 1.71" does not sink much at all.

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Re: 2.3" intake valves

Post  STR-LGL-70 on March 28th 2018, 8:55 am

Thanks Randy
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