My heads were flowed (suppose to me a conserviative bench. The intake number look kinda weird. They are on my car now, but i got these for the 383 i planon doing down the road Here is what was done. bowl-worked and chambers maxed out, 52 to 53 CC chambers after angle-milling, valves enlargedto 2.020 - 1.600, three angle valve job. Thes were flowed in 28 inches of water, 4.00 bore fixture and no pipe on exhaust ports.

lift I/E

200 134.0/111.0
300 191.6/146.0
400 230.3/172.9
450 244.4
500 244.4/180.1
550 242.4
600 242.4/187.8
650 242.8
700 240.5/189.9
750 242.8

 

The intake #'s do look a lil conservative but not all benches are the same. By the amount of work mentioned they seem pretty close though. The exhaust #'s seem a lil high to me.

Is this flowed on a Flow Data bench? They are supposed to be about 9% higher on the exhaust than if flowed on a Superflow bench.

NightTrain66

 

It was flowed on a super flow 600. I just have not seen many heads flow pretty much the same from 450-750lift (intake). I didn't know how having no pipe on the exhausted effected the flow. Or what the bore meant. Also, I didn't know how having bigger valves effected flow numbers. I wish I would have took some pics before I installed them.

 

Just looking at the flow #'s, the intake ports are probably flowing about that CFM. The larger valves and a good valve job will increase the flow #'s across the board. The ..450 and lower lift flow #'s are very good. All benches are different but if these #'s were on my bench, you should be happy with them up until this point for the amount of work that is done. If the shortside is stock and the bowl is not LARGE and if the roof has not been raised and if the pushrod wall has not been widened (this only helps after these other things have been done) than the port could level off at a low lift like this.

Some of these things will help the flow at all lift points and some of these will help at high lifts and hurt down low. If you have a valve job that is designed to flow well at LOW lifts only, it can level off at mid to high lifts as well.

Those exhaust flow #'s are VERY good. They look almost TOO good. To get a better comparison, ask him what a stock LT1 flows on his bench and compare the difference. A stock LT1 flows about 215/150 on my bench and if he picked up 30 cfm on the intake and 40 cfm on the exhaust (assuming his bench says a stock LT1 flows 215/150 as well) than you should be VERY pleased with these #'s from the amount of work done. If he is getting those low and mid lift flow #'s lift on the exhaust port, I would like to take a few "tips" from him and find out what valve job "recipe" he is using. There again, this is assuming that our benches are calibrated close.

NightTrain66

 

If there anything like the ones on tim's car, I wouldn't even worry about flow!. Those are about the same numbers I had on my heads before I put in the larger cam. They used to be on mikes (1fsttA)'s car. When they were on his 383, they held back 42 rwhp over the ported LT-1's he has now. They performed very well on my stock bottom end w/ hot cam. Actually turned 115 mph in the 1/4., but I think they will be a little weak for a 383. Exaust is good, but the intake is a little weak.

 

I'll take a look at my flow sheet Friday (I'm in B.R. and the sheet is at my home in North LA), I think it might have the specs on the valve job. I'll also see if I can get ahold of Larry Meaux to see what stock heads flow on his bench. Thanks for the input.

 

Who did the head work? I am in Shreveport. Did you have it done around here?

Jeff D.

 

Larry Meaux did it. He's out of abbyville (south, la). He is suppose to do some really good work. bayou boy on ls1.com is runnng mid 11's with a $500 clean-up job done by Meaux.

 

To be fair, LS1s run 11s on stock heads too.

 

so do some lt1s. whats not fair?

 

Without knowing what cam that person is running, its hard to make a judgement call on heads with a car that runs 11s, when a fairly mild cam puts an LS1 in the 11s with some grip, thats all my point was.

Whats fishy about the numbers I see is that they hardly move at all, anywhere, that makes me feel like they just made them up completely. I'm sure they probably didn't, something does not look right in Hazzard County though. Maybe the dyno will tell more though.

 

the cam is not big 224/224 or smaller (i think). I got the flow sheet and if they were make up than why not give bigger numbers? It should be getting tuned in the next couple weeks, then it's track time. We will see.