SS MPSTR

what stage LE heads/cam did you have again?

speed_demon24

LE2 heads with a BRE cam,... not sure what stage my cam was but it's the cam he reccomended for my stock bottom end just like AI's.

SS MPSTR

I don't think they knew what 'stage' your cam was either. Isn't your car the one that had the valve guides all screwed up? I think your car is the closest one we have to compare company 'A' product with company 'L' product, no? Has anything else been changed that might skew performance numbers? I want to be fair here.

speed_demon24

Nope. Only changes were going back to the stock intake, swapping the heads and cam. I also changed the oil pump and pan, but if anything thats costing me more power since I have the higher releif spring in it. And yeah all the valve guides were cracked. I know of another car that did the swap but I'm not sure AI or the owner of the car wants the gains to be posted, but they were bigger than mine.

JP95ZM6

117 something

dangalla

Out of curiosity

Did AI measure your intake runner size before they started, and also did they measure your combustion chamber size?

more than anything, I am wondering for my own knowledge

mdacton

I will let you on in a secret...but don't tell anyone
What ever head flows more@.300 and .400 with the smallest intake runner is the head you want. I know people with really high nuimbers but I know for a fact I make wayyy wayy more power with a smaller head. I don't know the specifics of why but I know.

tireburnin

Lol how many hundreds of LE vs Ai posts have there been? And now numbers show a back to back comparison (as close as this board will likely ever get) with an obvious "winner."

Good to see some results.

firebirdStud

congrats on the AI setup! They really have their stuff together. Hell, two springs ago they only offered the 190cc intake port on stock castings, and that is what I bought, and I am at 438rwhp, but that is with a 385 bottom end.
That accomplishment on a stock bottom end with that many miles, WOW! That is awesome.
Wonder what those heads could do for me...

truedualws6

Now you've got me thinking regarding the stock intake. I remember a post
somewhere where LE removes some huge amount of weight from an intake
when it's ported. Did you happen to weigh the stock vs. ported intakes?

I noticed that the work done on my intake is very subtle with the main effort
opening the front up for a 58mm TB, and of course any milling to match the
heads for proper sealing.

SS MPSTR

That's what I've always been told too.

I suspect the OP heads are a tad smaller than the heads they replaced

speed_demon24

I never weight them but I can tell the stock one is definatly heavier than my old ported one. It was also really opened up in the runners as well.

~18cc's to be exact.

Kory 88 Iroc Lt-1

congrats on the good numbers.
Maybe this will be the incentive I need to finish mine so I can finally get it tuned.
Good job
Kory

T/A lt1

Nice numbers but the Canton oilpan you added is good for a few horsepower so if you made 10more rwhp with a little larger cam then you guys are the greatest thing since sliced bread huh?

dangalla

and my question about combustion chamber size was also disregarded, without knowing that nobody can pass judgement

a little bigger cam and a little smaller chamber and you easily get the results shown here. i am in no way advocating anyone just think if everyone is gonna judge the facts should be straight