Welcome to the Corvette Forums at the Corvette Action Center!

vortec heads and ?? cam

Y

yooperod

Guest
A buddie of mine has a 78 L48 with auto trans
He's going to install vortec head and change the cam. Are thinking of a comp EX 262 .How will this work with the Auto trans??
I'm running a comp ex268 in a 327-4spd 3.55 gears and I think thats a bit much for a auto.but it's a smaller engine.

All sugestions are appreciated.
rod
 
P

Phoenix

Guest
I ran my 79 with a 68 327+030 and a crane hmv272 cam 355rears and an auto trans the heads were 186fulies same size combustion chamber as the vortec with flattop pistons and ran pump gas.No problems other than a heavy foot.
 

Tom Bryant

Well-known member
Administrator
Joined
Nov 9, 2000
Messages
7,255
Location
Edgerton, Ohio, United States
Corvette
1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
vortec

He may want to check hood clearance as his '78 intake will not bolt to the Vortec heads. They have a different bolt angle and arrangment. He will need an Edelbrock Vortec intake or a GM one if they offer a carb model.

Tom
 
Y

yooperod

Guest
Ebelbrock makes an intake that they say will clear, a performer(not rpm) anyone have experiance with the Ex262 cam.
It also has 3.08 gears.
rod
 

Craig1979

Active member
Joined
May 12, 2001
Messages
28
Location
Seattle
Corvette
1979 L82
Vortec heads/cam combo

I've been running Vortec heads on my 1979 for quite awhile now. Although my combos is a little more agressive than your buddies, and I've got more reaerend/transmission gear, your proposed cam should be fine. (You need to carefully double check all the valve/retainer/spring clearances on the Vortecs when valve lift begins to approach or exceed .480". Trust me I've invested a lot of time into researching and measuring).
My combination runs great and makes good power down to 2000-2500 rpms.
The Performer intake (specific application for Vortec heads) should clear the hood fine. The Perfomer RPM would be iffy??

My combination: 1976 350 shortblock, Vortec heads w/aftermarket springs, Performer intake w/Holley 650, Comp Cams 280H magnum cam, (3.70 rear gears, Richmond 6 speed tranny). Craig
 
Y

yooperod

Guest
Re: Vortec heads/cam combo

Craig1979 said:
(3.70 rear gears, Richmond 6 speed tranny). Craig [/B]
How is 1st gear with that combo?? and cruise rpms in 6th?
I have thought about a richmond 5 spd and 3.08 gears.(but the cost is making it hard for me to justify)
rod.
 

Craig1979

Active member
Joined
May 12, 2001
Messages
28
Location
Seattle
Corvette
1979 L82
Richmond 6 speed

Tranny works great! I must admit they are pricey. With the 3.70 rearend and 50 series 15" tires, I was looking for a manual transmission that would give me an overdrive option. But it had to be a durable heavy duty unit able to withstand the 350 engine output (that eliminated the GM T-5). The Tremec 5 speed for GM cars had not yet been released, and the Richmond 5 speed had no overdrive, so that pretty much left only the 6 speed model. When I ordered up the tranny I took into account my rear gear ratio and ordered the model with a 3.00 first gear reduction (rather than the standard 3.27). That ratio in conjunction with the 3.70 rear gives the car outstanding dead stop acceleration without the necessity to immediately shift to a higher gear. And the 6th gear overdrive is so sweet. The rpms at 60-65 mph dropped from around 2800-2900 down to about 1800. Makes the car much more confortable to drive, especially at the freeways speeds people travel today. Excellent acceleration, low freeway rpms, and 6 gears to play with - life is good.
With your 3.08 rear, you may already be happy with your freeway cruise rpms, the additional gear of the Richmond 5 speed will centainly improve the seat-of-your-pants acceleration factor. Analysis the 5 speed gear rations Richmond offers, and pick the one that best fits your rear gear and driving style/preferance. Craig.
 
Y

yooperod

Guest
Thanks for the info. I was wondering if you'd have to shift midway across the intersection. The combo makes sounds like fun :) The best of both worlds . I'm running 3.55s now. but if I change to the 5 spd ,I would go to 3.08 which would drop hwy rpms by 350.
rod.
 

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Supporting Vendors

Dealers:

MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!

Parts/Accessories:

Vetteskins

Advertise with the Corvette Action Center!

Double Your Chances!

Partners

Top Bottom