lloyd is a very nice guy , i emailed him about porting my lt4's and he flat out told me that altho he would have charged me very little to port them , on my car the improvement would only be a few tenth's and that money would be better spent on other parts of my car to drop my times. When I reach the point tho that I either have money to burn or the heads need to come off im gonna mail those heads off to lloyd .

 

I don't really know what the max flow would be using stock valves. You would need to ask someone like Lloyd about that. In my case the valves were not that expensive because I used a cheaper brand. I think it would be best to get the valves done if you are going to have the heads ported. As for what I paid, it was $1,000 and no cores.

 

I am currently having a set of iron heads ported by Lloyd and discussed this topic with him. I opted for stock valves backcut for my application, but I am looking for street manners and have a small cam (502). He told me that a set of 2.0 1.56 will generally flow 10-15 cfm more than stock valves depending on the brand, Ferrera being the best. He also said, at higher lifts, a stock valve with the proper backcut can flow about the same.

 

thanks guys iam really happy.

 

That's exactly what he did for me. Pics of heads before/after and flow number chart and graphs in sig.

Jeff D.

 

Just an observation but for the price he is charging he probably isn't flowing each and every port. I got the impression from an earlier message that he may not even have a flow bench? If that is true he is probaby porting them based on vast experience and the machine shop is flowing just one port. That could be the reason for the variances between you guys but on average they are probably all very close? Just a guess Either way, as has been mentioned, the proof is in how the car runs and his heads seem to do very well so who cares what they flow

FWIW, I just sold a set of LT1 heads. These heads were used on a LT1 Camaro that ran 120 mph N/A. While the flow numbers do not appear as impressive as what you guys are posting, they do perform well. Only one set of ports was flowed and here are the numbers...

Lift Exhaust Intake
.200 60 105
.300 76 192
.400 88 231
.500 93 258
.600 124 270
.700 180 270

As you can see, the numbers aren't as good as the ones being posted here but the heads work good... there is more to a good set of heads than just high flow numbers The exhaust numbers don't look right but that's what they the guy gave me so who knows.

Anyway, just wanted to point out that Llyod isn't using a CNC machine so they will all not be the same but on average they are probably all very close

 

The biggest numbers to look at are going to be your mid lift. The valve spends more time there than anything, and the higher the mid lift numbers the more total air you're going to flow.

 

Yup..he does have a Superflow flowbench
He grinds on 1 port then he matches that will all the other ones..Im sure the ports are within 5cfm of each other..

Cody

 

yep i was at his shop a week ago and he does have a flow bench.

seen it with my own 2 eyes.

 

Just saw this and figured I would add my .02.. my heads are currently with Lloyd and he just sent me the flow numbers..

.1 64/49
.2 134/105
.3 188/147
.4 232/168
.5 262/181
.6 269.8/187.8

total cost to me is 1000.. that was the porting, larger Rev valves, guideplates, 7/16in studs. and double springs..

these will get bumped along by a 230/236 and 1.6 pro-magnums..

His customer service alone was worth it.. can't say enough good things about his rapid responses to questions..

 

it's not all about max flow...

 

Something doesnt sound right! This car have N20 or what??? 120 mph

 

a good matched camshaft and it is very possible, i think those numbers are quite respectable compared to some of the big name companies

 

thanks for the replies time for me to put them on along with xe cam

 

Just cuz its an LT1 doesnt mean its a 350, Im not sure but it very well could be a 383 or something close, just a speculation though. 120 traps are very doable with the right gears and cam