AP-Engineering

OK guy's, here is our LS1 Stage I cnc ported cylinder heads. Below I will list the parts that they come with and also the flow numbers. It will take me one week to ship these heads from time of order. If you have any questions please feel free to contact me.

2.020 Manley stainless steel intake valves
1.575 Manley stainless steel exhaust valves
Comp Cams 978 springs
Comp Cams titanium retainers
Comp Cams hardened spring seat
Bronze guides
Teflon Seals


FLOW NUMBERS
Flowed @ 28"
3.970 bore
Flowed w/radius inlet
235cc intake runner volume

Intake
.100" / 73 cfm
.200" / 150 cfm
.300" / 207 cfm
.400" / 252 cfm
.500" / 285 cfm
.600" / 292 cfm
.700" / 301 cfm


Exhaust
.100" / 54 cfm
.200" / 111 cfm
.300" / 155 cfm
.400" / 195 cfm
.500" / 221 cfm
.600" / 231 cfm
.700" / 237 cfm

Exhaust was flowed w/ a tube.

I have a sale going on for these heads over at the sponsor/GP section.

Thanks

Scalpel

iTrader: (4)

Awesome #s.

SPANKY LS1

iTrader: (24)

Flow numbers look good, equal to most "S2" heads on the market. My only question is isn't the intake runner volume extremely large? Aren't most "small motor" heads 210-220? Isn't 235 gonna kill a lot of velocity? Also, how much will they flow on a 3.905" bore, as opposed to a 3.970" bore? Not flaming or bashing, genuinely curious, Shawn

Chris@AP-Engineering

iTrader: (-2)

Spanky, that is a very good question that you have. When portingheads you would like to keep the smallest size hole for the cfm that you are looking for. So if you could get a 210cc runner to flow 300 cfm that is what you would like to have. Especially if you are running a small cube engine. The larger cc runners will slow port velocity down but won't kill you that much. Also on a larger cube engine you should not even notice it. I would also bet that some head porters are not telling the whole truth on their runner cc's. They might be larger than they are letting on!

Thanks,

M6HuggerSS

any dyno results with those heads??? and how much?

taqwache

some track times please

Chris@AP-Engineering

iTrader: (-2)

Give me a day or so and I will get some dyno numbers scanned and also some track times. Thanks guy's

CHRISPY

Nice numbers!

Many of the vendors use cc's in the 227-235 range for a LS1 head. It is very common. My heads for example flow 298cfm at .600 lift with a ~228 intake cc.



Most of the S1 numbers I have seen have been in the 280-285cfm range for S1 so those numbers are very good.

Mirek

A Detroit area shop on the board...nice. You have unlimited opportunity (i'm sure you are busy) as there really is nothing else around, Detroit Speedworks has not been impressive, not sure about Tracy's, and Corvette's Inc. is a 100% JOKE...if they are still even in business.

When will the new site be up?
What is the (head) cost (w/ my core) installed/ do you install ?

How come your shop "could not" install LGM headers & how experienced are you with your ls1 edit tuning ?

2000 Vette
Berkley, MI

BOO HOO BRIAN

iTrader: (-10)

New site is www.automotiveperformance.net...... its a temp site but the new one is on its way.

We are very experianced with ls1 edit. Give us a call and we can chat.

Thanks

mikemodano9c

i sent you guys at AP a pm about some heads...

got any dyno numbers with them?

AP-Engineering

Mike, check your PM's

I do have dyno graphs for these heads. The dyno pulls were all done on our in house Mustang MD250 dyno. I will have them up on Monday for you.

Thanks

mikemodano9c

hey guys...your pm box is full...ill just post what i was gonna pm you here...

do you polish the combustion chamber on these stage 1's? any way i could see a couple pics of a finished set? sorry for all the questions i look forward to doing business with you guys!

i also need a price for a set of these heads, unmilled, with a head swap gasket/bolt kit shipped to 78758...

thanks...

Chris@AP-Engineering

iTrader: (-2)

Mike, I can dig up a few pic's for you. I will also get you the price for the shipping and the kit.

BTW, we usually do not polish the chambers after they are cnc'd.

Thanks

HOSS99

Let's see those Dyno sheets.

SouthFL.02.SS

Yeah. I'd like to see what these heads put down.

BOO HOO BRIAN

iTrader: (-10)

Here is the link to the dyno thread

https://ls1tech.com/forums/generation-iii-internal-engine/137377-ap-engineering-stage-1-ported-ls1-heads-pics-dyno-graphs.html

BOO HOO BRIAN

iTrader: (-10)

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