[PDC]

I know Butler is pretty fond of their 230/236 roller cam on a 112* LSA for comparable builds with 87cc heads / softer compression. I can’t imagine that they wouldn’t spec a larger cam for a higher CR build. If I had to lay money blind, I feel safe saying 500 hp minimum. At +/- $10k, that’s an investment with zero regrets.

[66sprint6]

Thanks again guys, for the input. I've had a couple of nibbles, but the CR and stuff seems to scare them off.

[PDC]

Originally Posted by 66sprint6

Thanks again guys, for the input. I've had a couple of nibbles, but the CR and stuff seems to scare them off.

Damn - if I was looking for a Poncho power plant, I wouldn’t blink. This will sell and the buyer will never regret it!

[Dragncar]

You are going to have to get a custom cam designed for pump gas.
I would call Tim G at Bullet. If you throw the wrong cam in this thing and they buyer is a knucklehead or just inexperienced he might have some issues.
Lots of places only have 91 octane and they buyer could live in how weather too.
That is too much CR to just throw a whatever cam in it.
If its a small cam, it will detonate. At least make sure its a proven cam for the ci, CR and fuel.
Its more CR than the 461 I built 11.5-1) and I am pushing it.

[b-man]

Originally Posted by 66sprint6

We're trying to sell our Round Port engine that we bought a while ago. Of course, the first question that prospective buyers are asking is how much HP. We don't know what cam is in it, but here are the other specs:

SRP pistions, 4.155 with a 7cc valve notch
Eagle crank, 4.25 sroke
Edelbrock 72cc heads
Assuming nominal .004 deck height and a .039 compressed gasket thickness

I went on Butler's site, used their CR calculator and found the engine to have an astounding 11.67:1 CR with this combo. Any guess on what kind of horsepower/tq this thing makes? We're trying to figure out what to do with it. The CR numbers are scaring some people away.

I plugged in your numbers on the Wallace Racing calculator assuming a 4.3” head gasket bore and came up with 11.59:1 compression. So pretty close to the Butler calculator.

Then keeping everything the same except for using 75ccs for the heads instead of 72cc you end up with 11.25:1. The 72cc Edelbrock heads I’ve seen reported here on the forums are commonly at 75 and not the advertised 72ccs.

So 11.25:1 is a little more in line with what you can get away with on pump premium, 93 octane preferably. Hopefully it has enough cam to go along with the higher compression.

[Formulajones]

Unfortunately I think it's not going to be an easy sell, as you've found out.
From what I'm reading it's an engine you bought complete and assembled and little is known?

Buying engines like that second or third hand can be a sketchy deal for buyers, especially when prices are high.
It might help if it were running on a run stand...??? Or is it?

[66sprint6]

[ATTACH][/ATTACH]Yes, we bought it assembled. We did hear it running, as we met the guy who sold it to us with the engine in his car. The only thing we don't know is the cam. But it's super lopey. I took the oil pan off to review the pistons, crank etc. that's where I got the part numbers.
I guess that my plan B will be to sell the heads, intake, etc. My new friend John is willing to take them. That would leave me with a pretty good short block for a future project. The engine is super clean and new.
Here's some pics.

[b-man]

Selling used performance engines is difficult and forget about getting top dollar for it, even if you had it built and you know everything about it component-wise and possess a dyno sheet.

5 to 6k would be doing well and realistic, no way will it be selling in the 10k range.

[tooski]

No one mentioned anything about assuming a deck height to calculate compression ratio?