Randy Tanner

hey guys. thanks in advance for ur help. i have a 1990 corvette. i bought teh car with no engine. has a garret built 350 th tranny with the corvette tailshaft. i also have a engine for the car but really need some help with the heads. let me tell u what i have so far. it is a standard bore 350 block. nitride coated/ standard 3932442 crank (block is 0010 btw 4blt) crank is 3.48 as stand but nitride coated as well. now get down to the fun stuff. has wheeler 6.0 connecting rods, srp 11cc high compression forged pop up pistons. doug herbert cam. specs are as follow
cam
dur int/exh 289/299
dur @ .050 int/ exh 251/261
lift 1.5-1.5 int/exh 598/625

lobe center 112
valve lash 018-020
rpm range 3000-7000

have a tr1yx tunnel ram 2.4 edelbrock side moutn
probably going to run dual 650? yes? no?

sfi balanced fly wheel
pro/street balancer

so whats ur thoughts? ideas? things u would do different? and maybe so help on the heads? is there anyway i can make a set of vortec heads work? thanks in advance

cv67

Dont waste your time with the Vortecs
Solid roller Im assuming?
What do you plan spinning this thing to?

Kevova

I would run 600s matched for tunnel ram/dual quad set up. Unless the race gods would produce a set of 660 center squirters. Too many choices in heads these days, but "pop up" may limit choices to run pump gas . Race only or street / strip.

1991Z07

I've got a brand new set of Brodix T1 M2's in the box I'm selling in the "For Sale" section...

http://forums.corvetteforum.com/c4-p...227-heads.html

383vett

That's one heck of a cam for an 11:1 motor. I would go down in duration, maybe change to a 110 lobe center or up the compression.

Randy Tanner

thanx guys. the car will never see a drag strip (not untill i figure a way to configure a different rear end arrangement that can handle it) but the car will be mostly a street car. driven once or twice a week. im fine with 14:1 compression. i wasnt planning on using pump gas at all. and yes its a solid roller cam. 3500 stall btw. the car will rev to about 6k max. like i said it will be popped a few times on the street but never on the track. and wh do u say no on thevortecs? and i really like the cam

STL94LT1

14:1 compression won't last long in a street driven car. Good luck when you get caught in traffic.

Randy Tanner

i stay in hemingway sc. 2 red lights. we dont have red lights. but stall shold help in traffic correct? i mean i dont have to have 14:1. thats y im asking about head size and specs? what heads would make it a lil more tame with what i already have?

Randy Tanner

y not vortecs. and yes its solid roller and 6k max. its a street car

Randy Tanner

was not planning on using pump gas

Randy Tanner

anything. im just looking for a head to make it as streetable as possible with what i already have

beerme

I am bery bery confused...............

Going to drive on street, no pump gas??????

1991Z07

E85 is the equivalent of 105-110 octane...it can support up to 13:1 CR easily.

Technically...it's pump gas, but hard to find in some areas.

We have quite a few stations here with it in Central Texas.

rithsleeper

You certainly have a lot of guts if you go with 14:1 and spend $9 a gal on gas and have a power band from 3-7k. Hats off to you my friend. (Sorry I'm off topic.)

Randy Tanner

so e85 is the same as 110? how does that work?

Randy Tanner

well the stall will keep it streetable. i think? and i really prefer not to run a cr that high. im hoping to lower with heads. but thats what im trying figure out. what type of head i could use to make it more streetable

cohocarl

Compression Ratio: 14.1:1 (58cc), 12.9:1 (64cc), 11.9:1 (70cc) if those are your pistons.

Vortecs? Gonna need lots'o work done to them to allow that much lift, along with good springs. (That intake's ports aren't designed for Vortec heads anyways are they?)

Sounds like you've got a nice build...I'd hate to top it off with a so-so head. How about a set of 70cc Victor Jr's? (if you're going to order a set of heads and re-use your rocker arms, remember to order them with the right size rocker arm studs)

1991Z07

http://www.iowarfa.org/ethanol_e85facts.php

Some web sites quote as high as 113 Octane...but I think they got it wrong. The 113 octane figure would be for E100...and you WON'T find that at any pump! (Well...maybe at the local moonshiner's distillery )

Add to that the fact that ethanol cools the engine SIGNIFICANTLY...and also you can add a tad bit of Octane Boost to the mix to get it a little higher. It burns clean...and when the engine is optimized for it will see very little reduction in efficiency compared to straight gasoline.

rithsleeper

I'm wondering how motorcycles do it because my gsxr runs a pretty high compression ratio. Think its 13.5:1 on 93 octane. However so many people say anything over about 10.8 on 93 octane will experience detonation.

cohocarl

I'm guessing perfectly shaped combustion chambers, most are dramatically oversquare, and I cannot believe the rpm some of these things are turning. Very impressive.





Sorry...off topic.