MY99TAWS6

iTrader: (3)

I have a gt7 lingenfelter cam not installed but since was going up to a 408 was thinking going up on the cam to gt11.Its mid 600s lift. I am also getting afr 225 heads and of course would get the upgraded springs.My car is a street car and rpm limit I would think would be set at 6500 max or is that too high for a 408? I put maybe 5000 miles on my car a year.So am I going to have to be changing out these springs every couple years? Not a fun job on the ls1 cars with the engine half under the cowl. Or should I go to the gt7 with mid 500s lift and maybe up that a bit with say some 1.8 rocker arms? That would still keep me under 600 I think.

I just figured the bigger displacement engine could use the bigger cam and see APS is running the gt11 in their little 346 with good results. So is the rapid spring wear thing overrated? Can I get 25,000 miles or about 5 years driving out of the springs at least. Talking the 8019 think upgade that you can get on the afrs.

MY99TAWS6

iTrader: (3)

Also do the afr heads and the upgrade spring option come with titanium retainers? If not what ones will work part numbers? I have some titanium retainers that am using on my current 918 springs.Will they work? Is titanium retainer really that useful to help the engine rev quicker or is that pretty much overrated?

kp

iTrader: (34)

I have no idea on the spring life (I replace the springs every year regardless) but as I understand all 225 AFRs come with the 8019 upgrade, on the 205s its an option.

The 8019 (and the standard springs) comes with titanium retainers.

RW99

I have AFR 225s and I *had* the "upgraded" springs. After a nice break-in for the new motor and valvetrain, they didn't hold perfectly (at 11 psi on a 346 with only 224/244/114 0.588) and I had some power fluctuation at > 4500 rpm. Switching to Patriot duals fixed that problem. YMMV.

MY99TAWS6

iTrader: (3)

Well every year is not going to happen. I hate doing springs on my f body it sucks huge with engine in the car. If had to do it every 25,000 miles or 5 years or so then it might be ok otherwise maybe should go with the milder gt7 cam.

MY99TAWS6

iTrader: (3)

Ok how much are patriot dual springs.What lift are they good for and if I order the standard springs on the afr since not sure can delete them to save money will they come with titanium retainers and will they fit on the patriot duals?

MY99TAWS6

iTrader: (3)

Ok looked them up.about 250 for set and comes with titanium retainers so no big deal there.Sounds reasonable.Would prefer a dual spring for sure over single for piece of mind,dropping valves is not fun.

MY99TAWS6

iTrader: (3)

Ok so they go on with no changes on the afr then? Assume their is just the one ls1/ls6 part number?

kp

iTrader: (34)

The 8019s are a way better spring than the patriots, the 'standard' springs on the AFR 205s are the same as the patriots.

I ran a 232/240 @ .600 lift cam to 7300rpm with 19psi and no issues with the 8019s on my old small bore 225s.

rjw

iTrader: (3)

What heads are you running now?

Thx

kp

iTrader: (34)

AFR 225s on the new engine, my 346 had the 'small bore' 225s and this 365 has the 72cc version.

DuronClocker

iTrader: (25)

FWIW, I have had the Patriot Golds on my car since last summer with a .641/.646 lift LSK-lobed cam revving to 6600-6800 and haven't had any issues with them.

I just picked up whatever set of AFR's is the same as the Patriots to use in the motor for next year. Not sure what part number these were, but they are EXACTLY the same as the Patriots I've got on the heads currently. With the D1SC, the car will more than likely be cammed with the LPE GT2-3 next year which is only .580ish lift. I'll have the springs shimmed accordingly.

Max lift the springs can handle is .650" and are very stiff.

I'm only replacing my springs this year because we're putting my old motor in my buddy's car. Otherwise, I'd keep them on for another year.

I was planning on replacing my springs every 1 or 2 seasons (max) with the .64x lift cam. Car gets 8-10k throughout the summer months and a couple times at the drag strip (3 times this year...the one day I put 26 passes in, then 4 passes each of the other two days).

Most important thing for these stiff springs....HEAT CYCLE THEM!

rjw

iTrader: (3)

Thanks

I will be running large bore 62cc afr 225's on my 383...think I'll have problems with the bore mismatch???

NemesisC5

5w20

iTrader: (21)

are all afr springs dual? I have some 205's bought used and not sure exactly which springs i have. Is there anyway to tell them apart?

kp

iTrader: (34)

You mean 72cc I assume. I would use them if I had them, you are talking .050 all the way around so thats not a huge difference. I have run way bigger mismatched chambers and bores, its not optimal for flow but it will work.

From what I understand the AFR 205s come standard with the older style patriot 'gold' dual springs or similar. The 225s come with the 8019 which may or may not be the same as the 'new' patriots. I dont keep up with the patriot stuff but when you buy used heads and arent sure what springs you have its best to have them checked and see what the seat/open pressure is. If you go to AFR's site they list the specs for the standard 205 springs and the 225 springs. But that doest mean someone hasnt changed them along the way..

rjw

iTrader: (3)

Nope 62cc chambers, but large bore....I believe that it would be more like 4.1-3.905 or almost .100 all around...not much left to bear against the sleeves.

I am running -28cc dished pistons, so static cr will be still under 9:1

kp

iTrader: (34)

Thats true they are like 4.100 in reality, either way its not going to kill you, I have run heads made for a 4.5 bore on a 4.250 bore on 1500hp N2O engines and they made plenty of power..

I went with the smaller bore AFRs and the 5.7 MLS gaskets for that very reason, I wanted the fire ring to be on the cast iron sleeve and not on the aluminum like the 6L and larger gaskets. I found that with the 6.0 gaskets they were eating into the block pretty well right outside the sleeve, dont know whether that really hurt anything or not but the more aluminum and more gasket would make for a better seal one would think.

I didnt realize the 62cc versions were available, I know they were delayed for a long time. Why not just get the small bore 225s and not worry about it, few CCs wont make a huge difference and you can always have them opened up down the road for a larger bore.

rjw

iTrader: (3)

actually, Tony M recommended them for my application...so....???

stevieturbo

Time to save up for that LSx

Thats what Im gona do at some point next year, at which point my heads will be ideal.. Unsure of LSx, or LS2....I dont want the weight, but the strength, and long term ability of iron would be nice.