lilbuddy1587

iTrader: (1)

Anything AZPS needs to be gone through with a "fine tooth comb". Good luck man!

silverbeast

iTrader: (16)

The heads on my car have 72cc chambers and the compression is 11.7 :1. ( not the car in my sig,lol.)

SScam68

iTrader: (20)

You still don't even know what cam you've got in there.

Figure that out first.

Louis

iTrader: (7)

If it was small, it would make more Tq.... if it was big, it would make more power. Its just a pooch all around. most anything ,especially with an AFR, with a 4" arm should make 400 rwtq from the dig, it doesnt.

White_Hawk

iTrader: (3)

Maybe it was built for boost? Maybe if you pull a plug you can see into the cylinder with something (I know they make fibre optic cameras) to see if the pistons are dished.

-Geoff

Tony Mamo @ AFR

iTrader: (13)

The serial number is probably 1630 designating it a 72 cc 225 (assuming it is that number)....whether it was milled or not we dont know unless you pull the head.

I would encourage you to do the leakdown test ASAP....I feel you might have a bent valve so your down a cylinder and possibly blowing compression back up the intake manifold (disrupting the flow from all other cylinders) causing the flutter and the spitting you were describing in the lower RPM's. That would hurt power output significantly leaving you with numbers similar to what your producing.

Its just a theory of course but something is holding that engine back....

Your cranking pressure is good kind of ruling out a cam installed wrong so we can eliminate that as a possibility.

If your leakdown is good then its time to really start scratching your head and diagnosis from there gets a bit more difficult.

I have a hunch it wont be good....maybe someone over-revved the engine and slightly bent a few valves....you never know.

Tony

martin@ams

Did a leakdown test and came out really good, 4-5% for each cylinder

Pulled the head and measured bore and stroke to verify it's a 427, bore 4.125" and stroke about 4" so that checks out.

I'm looking at the pistons right now and checking piston deck clearance and dish. I'll post some pics up of the pistons.

Pushrod info - 7955 comp cams - 7.400" .080

Head Serial# 00016670 then it's stamped #1660 in the head
Height from valve cover surface to head surface - 4.780"

Headgasket thickness .044"

Some pics of the disaster







Next step is pulling the cam and throwing it on my cam analyzer.

slowride

iTrader: (3)

Sound like you are getting there. I'd check the required pushrod length and what type of lifters it has in it. To much preload and you might hold the valves open, to little and lift might be sacrificed. I'd think you would hear to little though.

Tony Mamo @ AFR

iTrader: (13)

The 1660 is a small bore 225....(meant for 3.900 bore engines)

Measure across the chamber bore to confirm. It should be 3.900 (or very close to it)....not exactly ideal on a 4.125 bore engine.

Thats part of the problem but doubt that is all you will find....

I could port the heads you have to the correct spec if you have the time but you would have to lay the project up for awhile.

Anyway....keep digging....the skeltons are starting to fall out of the closet....LOL

Tony

PS...How did the FAST look?....was it stock or was someone in there as well? Send me pics of the port outlets if your not sure. A badly ported intake will make less power than a stocker.

PSS....I can tell looking at the pics its a small bore 225....at least Im 80% sure but the angle of the pic could be throwing me off. It also looks like the gasket ring is an eigth inch outside the chamber itself also confirming that but once again the pic is a bit blurry and at a bad angle to be completely sure.

Louis

iTrader: (7)

If its a 72cc chamber, thats less than 11:1 CR. A flat top with a 2cc relief and 70cc chambers is a tick over 11.2:1, thats a big dish, and its a bigger chamber.

Whats the cam say, got that out yet?

5% leakdown is a little high IMHO, I like to see 1-2 tops on a quality engine.

martin@ams

I just measured them and they are the smaller bore combustion chamber.
In interest of time I'll probably go with something designed for the bigger bore. LS7 heads?

Louis, the AFR PN 1660 is a 65cc chamber.

germeezy1

Your the owner of AMS? What does your shop car put down on pump?

martin@ams

yes, and our shop car hasn't seen pump gas in probably 2 years It's been sipping VP import @ 50psi of boost.

My street car (EVO) made 470whp on 93oct. It's a riot with the snow tires!

Bandit28

iTrader: (28)

Im guessing it is a auto? And if it is does it have the factory convertor? that WOULD hold it back. But what are the numbers?

germeezy1

So what crazy output is the shop car up to now? And its the red one right?
Is your EVO a 2.3 stroker car or stock displacement?

Jordan S.

iTrader: (17)

A freind of mine has a MS3 car. It put down like 350-360HP but runs 11.7-11.8 at the track. I believe the track numbers over dyno numbers any day.

martin@ams

1050whp, It's silver with the WWII fighter plane scheme.
http://youtube.com/watch?v=EvfJG1qJdZY
we've gone 8.5's but the t-case ***** the bed on every hard launch so now we baby it off the line, sucks...
My car is 2.0L , the drag car is a 2.1L (longer rod bigger bore 4G63).

I really want to boost an LS so badly, but the CTS-V just isn't the right platform.

slowride

iTrader: (3)

You could use the ls3/l92 6.2L heads, but you will have to use the factory intake till a Fast is released to fit the different style ports.

Yes you could go with some LS7's ported or not and a stock ls7 intake. I'd probably clean up the intake before install, but I bet it would make a lot of power with the right cam setup.

I'd keep the AFR's since you already have them (or sell them to get the ls7's sorry Tony and Let Tony open the bore up to match the larger 427 block. Those 225's should get you well into the 500+ range even with a mild cam.

A502slo

iTrader: (4)

Its a ctsv 6sp

Stang's Bane

iTrader: (22)

That would be great. I would love to see you guys see how far you can take a ls motor