Schred86

Hey guys. I wanted to share the little mini build that I have been working on for a week or so now with the corvette community. I've been able to read and obtain so much information from the site so I feel would be a good idea to share my work and experiences. The car just before the teardown consisted of these parts.
LME stage 3 heads milled .030
SS exhaust valves
Factory intake valves
BTR dual springs
Lethal racing stage 3 cam
Halltech 103 intake
Lightly Ported stock intake
Lightly Ported stock throttle body
Mantic 9000
Lg superpro 1-3/4"
3" muffler mod
Colorado speed trunnion upgrade
It made 570/517 on a dynojet.
Best pass at the track was a 10.68@134. First time at the track

My goal with the new setup is 600+ and sub 10.2 times. Hopefully a 9 one day. The new added parts will consist of:
Mamofied msd intake
NW 102 throttle body
BTR stage 4 cam
Johnson 2110r lifters
Walbro 450 lph in tank pump
FIC 850 cc injectors.
E85
ATI 10% ud pulley

Iam doing the whole install by myself and taking my time. I expect the car to be fully up and running by mid January. Once it is complete i will be getting retuned and strapping it to the dyno.

Same dyno will be used so im curious what my gains will be.
Stay tuned

Turbo2L

Another forum member just had a similar build and went from 580rwhp to 640rwhp. I don't think you will be disappointed. Keep us posted along the way!

Schred86

Will do. Whats the thread name?

double06

This is it I think:

https://www.corvetteforum.com/forums...e85-build.html

Schred86

Aha yes. I've read that thread. Great results indeed

Turbo2L

You'll be in that same ballpark. What compression do you anticipate running? Do you have the exact cam specs?

Schred86

Heads r milled .030. Im guessing somewhere around 12.5-13 CR. Ill be running a btr stage 4
247/258 112+3. I have to check the cam card for the rest of the specs. My other cam was a supposedly 230/248 113+3. Dont know the lift on it tho.

Turbo2L

With the BTR cam and 0.030 mill you will be closer to 12.1 or so SCR. I ran these number for another forum member's build for 93 and meth:

BTR IV 246/254 .652"/.630" 111+2 (assumes a 0.041 quench and 0.005 out of the hole)
SCR DCR Heads (cc) Milling (thousandths of an inch)
a) 12.26:1 8.70:1 64 0.036
b) 12.33:1 8.75:1 63.5 0.039
c) 12.41:1 8.80:1 63 0.042

If you can find the cam card, I'll be glad to add to the table for 12.8-13.0 SCR for you.

Schred86

Yes i have the btr card. Ill post it up

Schred86

so I pulled the old cam out and it was etched lethal-2. so the whole time I was told a "3". still don't know the exact specs on it.
my btr 4 is 247/258 @.050 112+3. .649/ .631


looking at what you posted, looks like ill be low 12's SCR. kinda disappointed. I thought I would be mid to high 12's.

Turbo2L

You can mill the heads more to get the compression you want. See if you can find the cam card. I need the other lobe/lift information on there. Then you can tell me what compression you want and I can tell you the mill you need to get there.

Schred86

I sent you a pm. Whats the max milling that can be done without interference with the piston / valve clearances?

Turbo2L

The factory pistons have valve reliefs so you can get wild if you want to. Several other members have been in the 13-13.5:1 SCR range recently with the same cam or larger without issue.

PM returned. I'll kick you some data later this evening. I'm going with a larger cam and shooting for 12.8-13:1 but I'm also going to smack it with a 250 shot as well.

Schred86

Thats impressive. Thanks I appreciate it. Pm returned

Schred86

Update: car is 90% back together. Anyone who is replacing the harmonic balancer i HIGHLY recommend using the balancer install tool. I cant imagine any other way of doing this safely.

While i was waiting on my lifters, i was debating milling my heads more. Turbo2L was very informative and helpful with this subject. I was going to mill anoth .015 but after talking to a couple of different people and LME i opted to leave the heads alone at .030.

Today ill be checking for the correct pushrod length to get those on order.
Lastly waiting on the mamofied msd and nw 102

jayyyw

What was the consensus on not further milling your heads? I have the same cam and was thinking of milling my heads .040". From what I've seen, .030" gets you around 11.7:1 compression.

Schred86

For what some people said, the gains were marginal. Others say big gains can be had. Another reason i opted out was not having the proper tools to check the clearances for the valves, pistons, etc.
there is also some talk that e85 will be no more in NY in the next couple years. I know i could have worked around that too but i had to draw a line somewhere.

jayyyw

I hear you..

Schred86

Ok. So im playing around with the pushrod checker.
Heres what i have so far. I think my 7.750 pushrods will be okay?! They are from the same exact head setup and head gasket thickness. Only difference is the cam and went from ls7 lifters to the johnson 2110r. im not sure on the base circle size of each though. Please let me know what you guys think.

Iam using the e/o i/c method too.
Going by "vettenuts" method. 1 turn from zero lash is about .047 preload.

Schred86

I also tried the "string method". I put the adjustable PR in the hole and have a string wrapped around the top and one holding on the bottom half. I tighten the rocker down snug, then i pull the string until the pr unscews enough until i get zero lash. That came out to 18 turns. X.050=.9 + 6.8= 7.70 + . 040= 7.740
Im just wondering if you would add preload to it bc i snugged the rocker down good?