huge c4 build. need help with heads
Thread Starter
Cruising
Joined: Jan 2014
Posts: 11
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huge c4 build. need help with heads
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
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
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
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.
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 110
From: Austin Texas
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
http://forums.corvetteforum.com/c4-p...227-heads.html
Last edited by 1991Z07; Jan 1, 2014 at 01:51 PM.
Thread Starter
Cruising
Joined: Jan 2014
Posts: 11
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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
Thread Starter
Cruising
Joined: Jan 2014
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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?
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Thread Starter
Cruising
Joined: Jan 2014
Posts: 11
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Thread Starter
Cruising
Joined: Jan 2014
Posts: 11
Likes: 0
was not planning on using pump gas
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 110
From: Austin Texas
Technically...it's pump gas, but hard to find in some areas.
We have quite a few stations here with it in Central Texas.
Thread Starter
Cruising
Joined: Jan 2014
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Thread Starter
Cruising
Joined: Jan 2014
Posts: 11
Likes: 0
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
Burning Brakes
Joined: Jun 2000
Posts: 865
Likes: 6
From: Auburn Michigan
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)
Last edited by cohocarl; Jan 4, 2014 at 09:22 AM.
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 110
From: Austin Texas
However, E85 has a much higher octane rating (100 to 105) than gasoline.
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.
Last edited by 1991Z07; Jan 4, 2014 at 10:35 AM.
Drifting
Joined: Dec 2007
Posts: 1,672
Likes: 8
From: Sumter South Carolina
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.
Burning Brakes
Joined: Jun 2000
Posts: 865
Likes: 6
From: Auburn Michigan
Sorry...off topic.