CNC'd LT4 flow numbers..
 

This isnt LS1 related but these are a really nice set of heads that MTI did about 4 years ago that i just had new valves put in.


The heads were completed yesterday. I had them flowed at lunch today by a friend.

4.030 bore on a Superflow 1020 bench.

The heads have Manley 2.02 intake valves and 1.60 exhaust valves.
All cylinders were within 5-6 cfm of each other..

----Intake Exhaust
.200--143--110
.300--207--147
.350--232--163
.400--253--178
.450--270--187
.500--282--194
.550--285--201
.600--286--206
.650--288--210


From what ive seen i have a monster set of heads. Which is why my car has always been so strong with a measly HOTCAM.

4.030 Bore
4.00 Stroke
408 cid

With the head flow numbers and my engine size anyone wanna recomend a Cam?

Here's the set of TEA S3 LT1's we just got for a customers 383 we're building.
Same bore flowed as u.


.100.....67.9/58.9
.200.....135.7/114.8
.300.....192.2/160.7
.400.....238.7/203.9
.500.....275.0/227.2
.550.....280.4/234.4
.600.....283.1/240.9

Wow do you have pics of the exhaust ports. What size valves?

How are they getting 30 more cfms than mine?

Call TEA ;)

Gotcha

Mike,
They use a pipe on the exhaust ports hwen testing they will tell you the same thing. They said it simulates headers ETC...
Jeff

I was told by a few reputable people here that there high exhaust #'s are from their flow bench. I'm not bashing at all and in Know way am i saying there heads are bad, just that there flow #'s through the exhaust are rated high and if they were flowed on a different bench they would be lower

Does any one know the stock flow numbers of LT1 and LT4 heads?

The reason the exhaust numbers are high at TEA is b/c they are flowed with a pipe.

Mine were flowed with a open exhaust port..