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I was looking at the promaxx 2211's but it says they are limited to .600 lift. and I plan on a 731 cam which is .610

Quote:

Originally Posted by mike tkach (Post 4516043)

i am gathering parts to build a 509.i bought a set of the eq 320,s that i am having a cnc valve job done on them,no port work .i got joe,s old inconel valves from his old heads and a set of manley severe duty ss intake valves.also have a set of 2618 forged pistons that will give me 10.1 to1 c/r.i am going to use a 525 efi cam and see what kind of power it makes,looking to spin it to 6000 rpm.i am looking for 625 but won,t be suprised if it does a little better.i won,t have time to complete this project untill late spring but when it is done i will post the results.

For a boat engine? 10:1. Or something else?

Quote:

Originally Posted by phragle (Post 4516055)

I was looking at the promaxx 2211's but it says they are limited to .600 lift. and I plan on a 731 cam which is .610

Buy bare

I would get non cnc'd and make valako work hard. Yup I alaways get bare heads and do what I can port wise and off to shop they go for detail porting/blending. Will be interesting to compare cnc to hand porting results. Getting 320's either route I go but have narrowed down anyway.

Quote:

Originally Posted by getrdunn (Post 4516054)

Somehow I knew I'd here this from you and I think you know the answer. A point less in compression will limit cam choices due to valve timing etc. Iron 9.5 and aluminum 10.5 max on this heavy boat but at least has effficient bottom.

You ever install a cam in an engine that requires 11:1 static comp in an 9.3:1. Valve timing on cams I've got lined up are all 10.5:1 - 11:1. Back in the day I had friends who wanted the king of the drive in cam in their muscle cars so they and had an awesome ratty azz idle but ran like turds.

I think there are far more things in an engine build, that can induce detonation, than simply the cylinder head material.

They told me I couldnt run boost with an iron head. They told me I couldnt run much timing. Because iron heads , don't dissapate the heat as well. 9lbs and 35* deg total, and no issues yet.

Only one season so far with them, but probably 15 or so wot runs like this. If she was gonna melt something, crack spark plugs, or anything like that, it prob would have happened by now. It doesnt take long at the 1.75hp per ci level. https://www.youtube.com/watch?v=DtWGMAdeKbU

Quote:

Originally Posted by getrdunn (Post 4516057)

For a boat engine? 10:1. Or something else?

it should work in a car or a boat.i don,t have any plan for this one and will no doubt sell it sooner or later.

Quote:

Originally Posted by getrdunn (Post 4516062)

If it wasn't for guys like JimV, there would be no cnc programs. :)

Dammit. I had to go and post that video. Now I miss my boat. Is it spring yet?

Quote:

Originally Posted by getrdunn (Post 4516054)

Somehow I knew I'd here this from you

Racially profiled comments will get you no where here. :lolhit:

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Originally Posted by MILD THUNDER (Post 4516064)

Your engines no doubt educated yourself and others. Like BB says if you don't push the limits a little from time to time and keep up with the same o same o you never advance or gain performance or knowledge. MT how your plugs look after those hard runs. Also you ever use a bore scope to get a visual of upper land. Any signs of hot spots or signs of breaking down near the exhaust. Just curious. I gotta give you credit. You've obviously got them tuned perfectly. That's the key for sure.

Thumbs up. That's good power for 468/420 on pump gas.