555 or 565 with Dart 308 Heads?
 

Anybody use a set on these motors?
I spoke to Ron Potter (Engine builder) a few years back and he highly recommended using them on 540 engine builds for big torque gains.
Im thinking of stroking my 509's with a 4.375 stroke. Not turning more than 5600 RPM.

Thoughts?

The 308 doesnt give up much flow to the 345 iron eagle, from .200 to .600 lift. It does that, with a 2.25 valve (2.30 in the 345), and a port that is 37cc smaller. They should work well for you, and make some great torque. They also make a 330cc, cnc ported iron head now, which would prob be the best performing, but cost more.

intake flow 308/345/330cnc
.2-157/158/169
.3-232/228/236
.4-291/289/297
.5-325/327/343
.6-347/358/367
.7-359/378/384
.8-363/390/394

I wish I went smaller when I did mine, my engine designer didn't know too much for heavy boat build.

You don't say? Please, tell us the story. I don't think any of us have heard this one before...

I agree with MT.

Tech tip: This is exactly how you have bothered the crap out of most people. Someone asks for tech advice and you whine about your stuff without any help to the OP.

No whining just saying so he don't make a mistake, f you

in case you didn't notice... neither of you offered any advice but tontespond to my post, and you really didn't need to... could have just went about your day... so there ya go.

​​​​​​​I agreed with MT

So fuk you.

Thanks MT!