I want to stress how important having a detailed engine build sheet is.
That receipt from the engine builder above is complete bullshit and is just lazy on the part of the builder…..
A customer should know exactly what he has….and it is very common for machine ships to not think this is important…..
If you pick up a fresh engine from the builder, demand to know more than the cryptic crap pictured above…..or do not pay.
If a builder does anything less than a complete sheet, they need to quit building engines.
Go buy an engine from Reher Morrison or Sonny’s and see the build sheet you get.

Jebby

 

so if I were to put a tri power set up back on the car should I get a new set of heads? The tri power has oval ports and it sounds like my heads a rectangular.

 

Do these rocker nuts look good?, I did notice a bit of play in some of the rockers with the valve covers off.

 

I totally agree with you. The more I look the more things I find that were sloppily replaced or installed, apparently this was more of a drag race type of a build than a street car type of build. Just more crap for to undo.

 

Yes….you have to have oval port heads for an oval port intake….

Jebby

 

Thanks for answering all my questions guys.

 

No problem….happy to help.
Let us know what you decide to do.

Jebby

 

will do,

 

if you need heads to run an oval tri-power, then aluminum may be the way to go. aluminum heads can handle more compression than iron. skip white starts with chinese castings and sets them up with a valve train he stands behind. and a 119 aluminum chamber is a lot easier to massage to 121 or 123cc than iron. and he may be willing to open the chambers up. might be worth talking to. https://www.skipwhiteperformance.com...val-274_94722/

 

You Poly-Locs are too short.....they are grinding up the rocker and if you look close, there is all kinds of tiny aluminum dust all over everything......

You need to get some long Poly-Locs and clean up everything......relash the valves.

Jebby

 

Thanks Derek I will give him a call and see what my options are.

 

Thanks for confirming my suspicions, I knew that didn't look right.

 

Sweet Jesus look at those domes. I'm agreeing with others here that said just sell the engine and put a turn key in that is already built the way you want it and with a warranty. If the block was decked, your "matching numbers" claim is gone anyway and even if it is the original block, any originality about this engine is long gone.

If you want to drive this thing around as is with that compression ratio, you're going to have to go to the airport and buy blue 100 leaded for $10 a gallon.

 

While it's definitely better...just wanted to mention it WILL bolt on and run...much like folks using rectangular intakes on oval ports. There's a big air speed change as it enters the head and maybe some turbulence...but it's been done for years.

Also want to add on the poly lock issue...those look to have minimal thread engagement and need longer studs as well as checking the geometry to establish correct pushrod length.

I haven't done the math...so not sure what gasket was used...but 11.67 isn't too terrible and the right cam could work. Iron heads might make it a little trickier...but if kept cool and tuned well it can work.

JIM

 

you can put all rectangle intakes on any chevy bbc head. some aftermarket oval intakes-usually those that offer rectangle in the same profile will seal on a rectangle head. this one is too small. the port itself in the head is larger than the casting around the oval intake port.

 

The rec port will bolt to an oval port with a large mismatch......but an oval port intake will not work on a rec port if it is a replacement type manifold.....it won't cover the recs taller ports.....
BUT.....intakes like the Dart or World single plane fit all, oval or rec.......as both castings come from the same core box......in fact you are right Jim as I put quite a few Dart oval intakes on rec port heads for boats in SE Michigan.......for some reason, a lot of boats have rec port heads on an engine designed to load and make power at 5500rpm......kinda dumb.....even these OP heads are spec for Mercruiser boat engine as stated earlier, when a large oval, or even a peanut port would work better.......not sure of the thinking there.
Putting an oval Dart intake in place of a rec port one would always pickup because the oval port runners promote velocity at lower speeds.....Dart even has a "funnel port" CNC program for heavy cars that starts life as an oval port intake 4150 pad with a Moroso Dominator funnel spacer and the CNC opens the oval back to rec halfway up the runner......great for heavy cars that run 540-565........
Good eye on the Poly-Loc too Jim......the lock is way down the nut.....a set of longer studs is the key. At this point I would not be able to not check the pushrods for length too......just to make sure.

Jebby

 

they took the 71 chevelle LS6 and threw a truck cam in it and called it the mercruiser magnum. nice source for steel cranks, 7/16ths dimple rods and rectangle heads though. find a 24 baja or bayliner arriva rotting away in somebody's yard. blocks usually cracked. you can sell the outdrive for more than you bought the whole boat for.

 

So I stuck a borascope into my cylinder to try and see what type of piston I have and it seems to be a flat top piston. My visibility was diminished but it did appear to be a flat top...so of that is the case do you guys think I could get away with a different cam and swapping the heads? I am going to run a tri power so I would need to swap the heads anyway to go from a rectangular port to a oval port.

 

I don’t think it is because a flat top with an open chamber head would be like 8:1 compression and no way would it even run with that cam…..
The engine builders sheet that says 12 to 1 compression and the piston part # lead me to believe this…..
What is the cranking compression?

Jebby

 

Forgot to get that, I will have it for you tomorrow.Sorry about that.