Does anybody have any good pictures of their stock , non modified LT1 intake ports?

I want to see how they compare to my heads.

Here are a couple of images of what i'm working with.

Thanks in advance!

 

I can get some better ones that show more tomorrow.

 

Hmmmm

The reason I ask is because I am at a fork in the road.

I have a slew of parts going on the car (including these heads , ported intake, larger injectors , cam , tb ect) and I need to do 1 of 2 things.

I either need to pull a head apart and take it over to Phoenix and have to bench flowed. With that information I can have PCMForLess burn a chip for my speed density car.

Or I can simply do all the mods to the car , load it up on a trailer and haul it over to TPIS in Tempe and have them burn a chip with the thing sitting on the dyno. It will cost slightly more, however it should be a rock solid tune when its all done and said. O and I will have dyno numbers to boot.

Either way the speed density is a thorn in the side

The heads are ported, to what extend I did not know, looks like from that picture there has been some extensive work on them.

Anybody have any thoughts on this ?

 

The work does not look that extensive.

1. I can see in your pic the roof is only raised about .050 over the stock gasket.

2. Judging the pushrod pinch from the gasket match it looks like very little grinding was done. On the front port what was done was not done evenly as the "porter" drug the bur along the corner wall of the roof and floor creating a nice trench and then didn't bother to make the center of the pushrod pinch wall the same distance across.

3. The guide bosses appear to have no narrowing, tapering or shaping done to them aside from running a cartridge roll over them.

4. Looks like quite a bit of the "twist" is still present in the roof of the port.

5. I can see all the cut marks are gone under the valve seat in the backside of the bowl area so looks like they probally opened the bowl up.... hopefully they knew 90% of the valve size is a good starting point.

Looks like a basic port match with some bowl work that someone spent a lot of extra time with a cartridge roll polishing up the rest of the port to make it look good. I can't feel the short side radius but if they spent the kind of time it took to polish that port like it is and port the bowls they probally also took the time to roll and blend the SSR.

All in all probally decent work for a mild street car.

If you have a snap gauge or inside mic and can give me a measurement of the narrowest point of the pushrod pinch point it will tell me a lot more. Of course if you do take them off and can remove a valve and measue the valve bown under the seat that will tell me even more....

How much power are you trying to make?

Typical LT1 castings with good clean up work like I see on yours will go in the 230-240CFM @.500 range with a good valve job and a 1.94 intake valve. Stock LT1 heads with stock valve job typically flow about 190-203ish CFM@.500.
Will

 

Wow

That was alot of good info!

What I took away from that is this:

1. The heads will without a doubt flow more air then stock heads.
2. They look nice however the majority of the work was cleaning them up and making them look pretty.

Power goals are not very high for these heads. I will be putting them on the car , along with a ported intake, 52mm TB, 24lb injectors and a mild cam (276/280 adv duration - Comp cams 276/281 advertised duration 224/230 duration at .050 tappet lift .503/.510 Intake and exhaust valve lift w/ 1.5 rocker arm ratio), long tube headers,(have shorties on there now), Harland Sharp 1.5 RR.

Figure since I own the parts, their going on , the car will get tuned and the numbers will fall where they may, I do suspect this will all result in a nice little bump over stock though



The block in the pictures (which the heads were on when I snapped those pics) has a spun rod bearing and needs to be gone through. The long term plan is the rebuild it as either a 383 or 396 with some AFR heads and really aim for some good numbers.

The stuff currently going on the car is to just have some fun with until the rebuild is complete and I get enough motivation to actually swap the motors out.


That breakdown did answer probably the most important question for me in that it appears I would be better off taking the car to TPIS and letting them burn a chip for it whiles its sitting on their equipment and using their wideband sensors then mail ordering a tune.

 

I should use a stock LT1 gasket on those and take another pic. Think I tossed them last week, not sure.

If you just take the valves out of one cyl you can usually get it flowed for about $75 or so to get a rough ideal. Clean them out first or they may not flow them for you.
.Bring the valves and keepers with you

 

Looks like they cut into the entry way wall, took some of it out and stopped. Rest may or may not be smoothed...hopefully they got in the bowl some, youll see most your gains in there along with spending time on the valve guide bosses.
These are new bone stock LT1 heads pics taken today.
They got some debris in there from getting the exhuasts worked over, ignore it.