I found this on ebay and for the $$ it looks like a lot of bang for the buck any thoughts?
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=280131079028&ssPageName=MERC_VIC_RCRX_Pr4_PcY_BIN_IT&refitem=280120351135&itemcount=4&refwidgetloc=closed_view_item&usedrule1=CrossSell_LogicX&refwidgettype=cross_promot_widget
68 camaro 373 gears, 12 bolt posi, turbo 400 and TCI streetfighter torque converter. Hoping to run mid to high Ten's.

I saw this guy before and was impressed with how clean the shop was and what appeared like good work. I could have my brother inlaw check him out since he lives in colorado, but he barely knows how to open the hood of a car.

It does sound like a good deal!

It does sound like a good deal!

It does indeed. Now I'm really interested and you bet that I will definitely remember this guy. I also see that he has a 505 that puts out 650 hp for $6500 that has forged internals.

Just keep in mind that anytime you mailorder and there are problems it could cost you dearly in return shipment to have the warantee honored. You may also have to prove the problem was not caused by you during installation or break-in. If you don't have a mechanical background or a lot of hands on experience this may be hard to prove... This guys product may be great and at a great price but if something does go wrong you might be ahead of the game with a local builder.

My main concern is the advertised headflow numbers. They are optimistic in my opinion. If you check around with any serious head porters.....most will tell you that exceeding 300CFM with a factory casting is pretty rare. Some of the best examples do about 315 to 320 being very heavily worked. Still sounds good and all for sure.....but some of the advertised numbers may be a little optimistic is all.

whats the guys name who built those motors?also i dont see 300 cfm being unreralistic on a bb chevy head .you can get 260-270cfm pretty easy ,with a 202 valve in a vortec sb head, with 170cc runners to start. so why is 300cfm or so ,out of 265-270cc runners with a 2.25 valve so unbelievable?

whats the guys name who built those motors?also i dont see 300 cfm being unreralistic on a bb chevy head .you can get 260-270cfm pretty easy ,with a 202 valve in a vortec sb head, with 170cc runners to start. so why is 300cfm or so ,out of 265-270cc runners with a 2.25 valve so unbelievable?

I agree, that seems fine for those heads on a big block. When I first read this thread I had not clicked the link and thought we were talking small block heads, which would be a lot less believable.

Jody

The higher CC count in big chevy heads is largely related to the fact that the runner is just plain LONGER. Longer doesnt necessarily mean that they move any more air at all. If you doubled the lenght of a 200 cc small block chevy port....it would be 400 cc, but the cross section would still be the same, and so would the port shape. So if you "theoretically" did this......the head would move just the same amount of air(same minimum cross section, same port shape)....but it would fall on its face a lot earlier cause the port is so long. Port velocity would go up like crazy and the port would go sonic a lot earlier. Talk about having to move air fast if your trying to move the same amount through a space thats twice as long in the same amount of time! Velocity would HAVE to go up, but it can only go up so far. So in this crazy example......the 400 cc port would not outrun a 200cc.

Well, to a degree....this is whats going on with big chevy heads. Just because the overall CC number of the port is larger.....a lot of that size comes from length. Think about peanut port big chevy heads. Their port volume(in CC) is still bigger than most aftermarket small block heads......but they dont do a whole lot for power and rpm. Its just a longer port. Doesnt matter that its real big in comparison to small block heads......they dont perform reguardless.

Just search around and you will find info on this. There are ton of guys happy to share what their heads flow and what they did to get there.

90% percent of them with bowl work, chamber work, and big valves flow between 275 and 300. Some heavily ported ones(a very small percentage but they are out there) are between 300 and 310. This is usally with big valves, chamber work, bowl work, and a lot of work in the runners to get 300 plus. The best example Ive seen(not even a fair comparison either) was a set of 781's heavily cut and rewelded, reshaped and all to get high 320's(on the good port). The guy had 4 grand in these things cause he had to go fast but was also limited to a stock style oval. And it cost a lot of money to get that kinda performance. So 300 CFM isnt unbeleiviable. Its tough, but doable. 318 is really getting up there. Thats getting a lot more unbeleviable without real heavy work in the hands of an expert.

When talkin big chevy heads VS small chevy heads, you cant compare port size in reference to flow numbers cause there are too many other things going on that make this an unfare comparison. Just search around and you arent going to find too many that flow over 310.....and most are 300 or less. So unless those heads are very heavily worked, I still wont buy those flow numbers just yet.

One more thing....I wanted to clarify that I was not bashing this engine or stock BBC ovals in general. Reguardless of whether the numbers are a little optomistic or not........the big chevy and those heads can run awesome. Flow numbers aside(which in the grand scheme of things dont mean much anyways), there is lots of potential with the stock ovals and Im a huge fan of the 049 and 781's and such.

You will find plenty of guys with those ovals that dont have the whiz bang, bells and whistle type of work done to them.....but they are running 10's on a descent port job and large valves. So yeah, its doable. I posted this just so you dont get your hopes up waaay to high cause you never know. Basic headflow data was posted, but they did not mention at what pressure drop the heads were flowed, nor was the bore fixture mentioned. So.....we got potentially optomistic headflow numbers(based on what you typically see from those heads when worked a lot), but no test data.

We also have a horsepower number, but no dyno sheet, no mention of what rpm the engine made peak power, and no camshaft specs. There are also "optomistic dynos" out there as well. Im not saying that it is....Im just saying that its a possibility.....and there is also a possibility that it wont be a drop in and go tens deal.

That was all I really wanted you to do. Dont get your hopes up for definite 600 plus and tens cause its "possible" that its a little optomistic. That said...its still lots of good parts and even if it wont drop in and go tens....the potential is there for sure. And even if it were 50 horsepower on the high side.....there is still yet potential to get in the 10's in a light, well sorted out car with 550 plus horsepower.

I would request a dyno sheet prior to buying so you know how this thing is gonna act.