260B4U

iTrader: (4)

first all let me thank AFR for making a great quality head. i just set the wipe pattern on my yella-terra ultra lites and they were dead on center with only the single shim that was provided i hear so many others have to buy additional shims or get custom thicknesses and i was able to avoid that PITA...

second is a question for the math majors
my afr's were milled from 66cc's to 60cc's ( .006-.007 x 6cc ) = .036-.043 inches.
my yella terra's only required a single shim .048 shim
my 228r cam is supposed to have the same base circle as stock it will arrive in a day or 2 so i can measure to be sure known ls6 base circle base circle diameter is 1.497 inch
ls7 lifters which require only 50 thou pre-load

any guesses at my pushrod length???

Arc00TA

iTrader: (17)

I don't know, but I'm in the same boat. 228r will be here this week, using LS7 lifters and fel-pro .041 gaskets, my AFR's are only milled to 62cc though.

260B4U

iTrader: (4)

True but your compressed gasket height it .010 closer which brings to about 60.5 cc what power and comp ratio are you shooting for ?

260B4U

iTrader: (4)

What Injectors did you choose I went with katech 38lb Injectors what other Mods do you have I'm curious how similar our power #s will be

Arc00TA

iTrader: (17)

Haven't chosen injectors yet, but probably going to use a set of red top 42# I have already. Shooting for around 10.8:1 but I think it will be a little higher. I only have california 91 octane watered down gas to work with. Still using my BBK intake, and ported stock TB for the moment, but I'll be looking for at least a 92/92 setup in the near future once I get the car running.

I'll be getting a set of 1 3/4 kooks stepped to 1 7/8, and a custom Y to 4 inch catback. Not really sure on the power output, I'm hoping for more than my last build, which was 224r with stock 243's, it made 425rwhp. What kind of numbers are you shooting for?

vettenuts

iTrader: (4)

I didn't find the thicker shim to be an issue and in the end my wipe pattern was only 0.045" wide centered. As for your questions, here is my guess based on your information but I wouldn't use mine or anyone elses guess, you need to measure as there are other variables in addition to your list. Not sure where you got the LS7 preload of 0.050" either.

Stock length = 7.385"
Milling: 7.385 -.036 = 7.349
Shimming: 7.349 + (0.048 * 1.59) = 7.425"
Stock preload I have measured is nominally 0.100" so a reduction to 0.050" would reduce length by 0.050" so final guess would be 7.375" gauge length pushrod.

Make sure you measure PTV, my setup was under minimum on the intake side with 224 intake duration and Cometic 0.040". You may be OK from the thicker gasket but you should verify.

260B4U

iTrader: (4)

texas speed recommended the 50 thou of preload on the ls7 lifters
im optimistic shooting for a 460ish rwhp with out spray we have 93 here with 10%ethonol
wow you were still outside the safety net with the 224 cam? glad i didnt go with the tsp 233/239 cam that i really wanted.
what cc were your heads?


new mods to go with H&c swap
25% underdrive pulley
head studs
comp hi tech push rod of undetermind length
rollmaster double chain
rpm stg 5 transmission
comp 926 springs with ti retainers on the afr heads
100hp shot nano kit

as for current mods made 373 rwhp on a stingy dyno
tpis 1 3/4 longtubes no cats random tech xpipe and borla stinger straight pipes,
haltech venom intake
spec aluminm flywheel and spec 3+ disk and hd pressure plate

next round of mods
dewitts raditor with oil cooler
electric water pump
fast 90 or 92 with tb
upgraded rear end

vettenuts

iTrader: (4)

My heads were milled to 60cc after Tony re-worked the chambers to unshroud the valves. This left me at 62cc for a final volume. I also had a thinner gasket. But checking PTV is critical while its apart, you need to know your numbers.

Arc00TA

iTrader: (17)

How should I go about checking PTV when I'm using graphite gaskets? I don't want to torque the gasket down then have to take it back off since it will be junk.

260B4U

iTrader: (4)

check it with no gasket hand tightened with the bolts then add your compressed gasket thickness to your final number so if you had .o53 ptv clearance with no gaskets the add your .041 compressed gasket thickness and you have .094 ptv clearance

Arc00TA

iTrader: (17)

I guess I can do that. I'm thinking these are thicker than .041, its the fel-pro one I can't remember the number off the top of my head. Just eyeballing it looks almost as thick as my .053 MLS gaskets.

260B4U

iTrader: (4)

You had said in a previous post the gasket was .041 I don't think anybody can eyeball .012 difference in gasket

Arc00TA

iTrader: (17)

I was assuming since thats what everyone says that gasket is. I compared it side by side to the other one and it looks thicker. Just wondering, since fel-pro conveniently never states how think the damn thing actually is.

vettenuts

iTrader: (4)

Here's what I did. My prior gasket was a GM MLS. I drilled out the rivets and removed one thin layer of the old gasket. The remaining two layers will come out right at 0.040" plus or minus a few thou. Don't measure without a gasket, the piston comes out of the hole and will hit the head so you won't be able to turn the motor over.

260B4U

iTrader: (4)

well i used a adjustable pr checker and i got 7.310 plus the 50thou preload =
7.360?

vettenuts

iTrader: (4)

What gasket did you use for checking?

RJB01camaross

did you get the new AFR 210 heads?

260B4U

iTrader: (4)

dont think so their about 6 months old i used the gm mls .051 gasket

260B4U

iTrader: (4)

so i made 449.9 rwhp and 420 tq today on the dyno