BriancWS6

iTrader: (18)

I think I have finally came to a decision on a heads/cam setup. I just need some final input on gasket thickness, how much to mill, pushrod length, etc. Here's my plans:

AFR 205s/whatever gaskets and amount milled to acheive ~11-1 CR
XE-R 232/234 .595/.598 112+? The TSP Torquer cam
Underdrive pulley

I'm gonna go with Racetronic 42lb injectors and Racetronic fuel pump. I have a dry nitrous kit so that's why I'm going so large on the injectors.

I also know I am going to have to flycut the pistons to have safe piston-valve clearance. If anyone has this setup or knows how deep to flycut that would give me a good starting point to have in mind.

And yes I know about the other stuff like oil pump and timing chain.

Current mods in sig.

Any and all input is welcome and appreciated. Thanks guys

BriancWS6

iTrader: (18)

Where's all the knowledgeable people I usually see posting up? I can always get this finalized through sponsors, but I like 2nd opinions from the "Been there, done that" guys.

JZ'sTA

iTrader: (23)

Looks like a great setup.
Just make sure you get the correct PR size after milling the heads.
Also remember to mill a little more then the calc says OR enter a 2cc piston in the calc so you can see what cc the head needs to be to achieve 11:1 CR after flycuting.
I personially would go 11.5:1 but thats just me.

zo6vetteman2003

iTrader: (1)

I believe that you will not have to flycut.
Here is a link to see.
http://forums.corvetteforum.com/show....php?t=1426302

bird2002

I cant wait to see the end results. Good luck

slow trap

iTrader: (22)

i would use some .040 cometics and try to get in the 11:5 cr range as well.i just ran it and acording to the calc i use if you get your heads down to 61cc with a 1 cc dish in your pistons with a .040 cometic you will have approx. 11:35 scr,8:45 dcr with the cam on a 112 +0.

BriancWS6

iTrader: (18)

Thanks for these replys fellas. I KNOW I will have to flycut though cause Tony Mamo said that the largest cam I could safely install with the milled AFRs would be a 228/230, and I'm not sure if he meant that on a 112+0, or if that could be a 112+4, which would be even tighter.

About the Cometic gaskets....I have heard alot about them leaking? Anymore thoughts on that?

11.5 CR? Would that be a little too high for pump gas? It does get hot here in the summer, been in the 90s this past week.

And on the pushrods...yeah, I will have to have that calculated after everything else is figured out to achieve the proper length.

Thanks for all your replies so far!

Spinmonster

As stated the cam would be 8.45 dcr at 11.35 and 8.6@ 11.5:1 which is fine on 93. Dynamic, not static compression is what determines the ability to run on pump gas. You could run 11.6:1 @8.7dcr.

BriancWS6

iTrader: (18)

Interesting and useful info, THANKS!

Brian Tooley Racing

iTrader: (13)

You could run the TFS 215 heads so you don't have to flycut your pistons. Here a link for some info.

http://www.trickflow.com/product/che...ls1/pr_ls1.asp

Tony Mamo @ AFR

iTrader: (13)

With the fact you are going to flycut affording you a comfy margin from valves tagging pistons I would advise you take the heads down to either 59 or 60 cc's depending on fuel available....59cc for a 93 octane set-up (about 11.5 or so)....60 cc for 92 octane (11.35 or so). Don't forget the notches typically displace about 2cc's or a little less which is why the CR isn't thru the roof with a small chamber....both my figures assume a piston .007 out of the hole and an .040 gasket for better quench.

I would personally run that cam with zero advance (112 + 0)

Dont skimp on the CR....the big cam will bleed off a lot of cylinder pressure and you will have a "soggy" bottom end....compression is your friend and your going thru the trouble of notching....take the most advantage of the room you have. The right tune wont detonate with that much overlap, even on straight pump gas in reasonably hot weather.

A FAST 90 is an obvious choice for an intake here assuming you don't have one already.

Good luck....it should make big power if all the pieces fall into place.

Brian (Tooley)....Out of curiousity what exactly is the valve drop with the new TFS LS1 heads at a 66 cc chamber volume?? Thanks...

Regards,
Tony M.

Brian Tooley Racing

iTrader: (13)

The TFS heads come off the CNC at 64cc, and at that volume the valve drop is .160", which I think is .040" more then the AFR 205 at 66cc which is .120" ?

So the AFR at 64cc would be .110" valve drop? Which means the TFS have approximately .050" more P to V then the AFR at the same compression ratio.

Tony Mamo @ AFR

iTrader: (13)

Actually, based on your info, it appears the 205's (AFR PN 1510) actually have more clearance.

Note this info I posted about 6 months back.

https://ls1tech.com/forums/showthrea...205+valve+drop

Here is the specific data I am referring to in that thread for guys not wanting to pull up the link....

Thanks,
Tony

PS....Just to be sure of my former figures, I pulled a production 205 off the floor and actually got a valve drop of .188 (even more room). Keep in mind guys that slight variances in valves and valve job depths will obviously have a small effect on valve drop. Its these kinds of "stacking of tolerances" (among others) that I always preach to each individual to always check P to V, even if their "buddy" got away with it.

BriancWS6

iTrader: (18)

Now this thread is getting the attention I hoped for in the beginning.

One thing that has sadly changed since I made this thread.......my poor 10 bolt I am afraid is on it's way out. I have been driving it easily here lately to preserve it til the new STRONG rear is here to take it's place. With that said, I will be using the money that WAS going for the heads, to purchase a new rear instead.

Yeah I know, I should have been getting a new rear first before making the big power, but it's hard to put money into something that is fine....or was. While it's not gone, it's beginning to make some creaking, and I think the posi unit is hurt.

One good thing though, is I will still be getting heads, but not at the same time as the cam, so this info will definately be used, just not right now unfortunately

Brian Tooley Racing

iTrader: (13)

I think you must have forgot to put a valve in it, because if your valve drop on the set we have is .120" and the one you have on the floor is .188", then a stack up tolerance of .068" is a little hard to believe, especially since the TFS stack up is + or - .005"

Unless you have drastically changed your program since the beginning of the year then something is WAY wrong here.

Rick@Synergy

iTrader: (5)

This is a pretty good thread and very informative. But I had a wild hair to go check a set of 205's I had sitting on the shelf. I think tony was more in the ballpark with his info. I came up with .181 for valve drop on a set of 205's. I will add that anyone can be off by a few thou, but still, even if .005 off, thats still alot closer to what Tony was claiming with his. Hope this info helps.

Don Ricardo.....out.

Tony Mamo @ AFR

iTrader: (13)

They have never had that little valve drop, unless the set you have on your shelf is milled a bunch.

Also, I just measured the one I checked a little while ago, but this time used one of the granite checking surfaces in the engineering dept to get a more accurate measurement. I did get a little less (about .181) so it seems my formica desk just isnt that flat....LOL Also, keep in mind that plus or minus a few thou is easily found in checking error (trying to keep the vernier caliper perfectly in line with the valve etc. ) I also checked another head to be doubly sure and got like .179

Perhaps others could chime in here as well.

Tony M.

Tony Mamo @ AFR

iTrader: (13)

Rick...

Just saw your post....Thanks for chiming in.

And yes, unless you want to take the time to set up a dial indicator off the valve, a few thou difference in "checking error" is easily had because I had to check like 10 times to try and and get the same number to repeat (to the thou).

Good stuff....

Tony M.

Brian Tooley Racing

iTrader: (13)

Evidently the difference comes in with how we measure them, the TFS valve drop is .040" more then the AFR we have here and they are unmilled. So I guess that makes the TFS around .220" with the way you measure them.

Rick@Synergy

iTrader: (5)

Can you teach me how you do it? Maybe I will come up with something different? I am just trying to understand how two guys came up with the same thing. Thanks.

Rick