Have been using my Chevelle as street/strip
last few years. 12.84 and 18mpg - good compromize each way I think. Now I want to change its purpose. Want to tow my 1962 dragster(1700#) with it and get good mileage.
Will stay with 700-R4 but will change
3500 lock-up for stock lock-up. May change
3.31 gears for 3.08. Will keep .060 454(468)
big block 10:1 comp engine. Must change 540
lift 296 dur. cam but not sure what would be a good grind to give low rpm grunt and mileage and still take 4500-5000 rpm's ???
Used 750 Holley on strip and 600 on street; should I go to quadrajet?
Sorry to be long-winded ; what do you
think??
Thanks,
Ron D.

Ron, off the cuff I'd say something along the lines of the Crane or UD 272 grinds. I'd want to check the dynamic compression to be sure you can easily run the car on pump fuel. Will you use a lower grade of fuel?

I'd use the 600 unless a good QJ came your way.

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Gene
ACES / CanAm Chevelles
67 SS 427 (http://www.chevelles.com/feature/october2000.html)

RonD,

The BB272H12, in duallies with other-wise stock engines, has been giving 8.5-9.5 mpg towing a 28' trailer with race car, 12-13 mpg without the trailer. That's with those stiff rear gears. It also makes around 21" of vacuum.
The BB276H12, same .515" valve lift, would reduce cylinder pressure slightly with the high CR.
Both of these cams will cause the front end to 'float' at high speeds...........
Totally stock 454, 8.8 CR, quadrajet, CI intake and exhaust, Mercury Marine's dyno, gave 380 BHP around 5000............
This was real-world HP, not Westech HP. I have never had a real street driver who didn't love either of these 2 cams..........

UDHarold

Thanks, Gentlemen.
Yes Gene, I do intend to run regular
gas. Even with this compression ratio I
seldom got sparkknock with the 296/540 cam,
(though vacuum at low rpm was borderline) and I was hoping to obtain the same with my new combination.
Harold, I've never really considered Ultradyne before but you are convincing me.
I will give it a try!
Thanks again.

yeah but 276 is 20 shorter. no one seems to have a 114 lsa grind, which would help with regular gas.( wide centers might not be good for towing?)

A 276 on 114 LSA has the same overlap as a 272 on 112 LSA, but it will lower cylinder pressure a little because of the later closing intake.
We make them, same price as 112 LSA.
I've just never had a dyno report on a 114 LSA 276.......
It will pull from idle, at about 550.

UDHarold

What's the .050 numbers on these cams b/c I always read that a 210/218 at .050" was a very good work cam in a BB.. Like max torque type at 3500 or so rpm???

Harold is this about right??? pdq67

pdq67,

I have a number of cams,
262 207 .490"
266 211 .500"
272 217 .515"
276 221 .515"
286 230 .515"
All of these work very well. I put a SB266/276H12, with 1.6 rockers, in my 15-yr old daughter's 84 Camaro when she went to the 10th grade. AFR 195cc heads on a 383 SB,625AFB on a Performer, and Hookers.
The 1st problem was the oil light kept coming on..... The 380-400 rpm idle was TOO low.... Moving the idle to 550 eliminated the oil light on at every red-light. It always slaughtered 5L Moosetangs. The car ran for about 6 or 7 years, one set of valve springs, tappets, etc. The girl she sold it to rear-ended 2 cars at stop-lights in less than a year.
My Olds buddies love the 211/217 in their 455s. And Terry at FCR put a 207/217 in a 455 Olds 76 GMC Motor Home---They claim 95 mph, and over 9 MPG, I guess not both at the same time.
A 211/217 on 112 beats the old Chevy High Performance hydraulic by a big margin, and actually idles much better.
All these are available, because we custon-grind everything......

UDHarold

pdq67,

I'll have to dig WAY back in my archives, but I think I have a dyno test of a BB266H14 in a 496. Bob's Auto, of Bristol, Ct, did it in the 80s.
It had a VERY wide torque curve...........

UDHarold

Hi Ron

I would NOT drop the gearing to a 3.08. At 70 mph+ w/2004r my engine loafs along @ 2100 rpm with 28" tires with 3.42 rear end.

Jim

And I would seriously consider the wider 114 centers with that 10:1. You might just get by on Plus grade fuel. IMHO I wouldnt really want to have to run a "tow" vehicle on 93, but I dont know how much towing you;ll be doing.

The wider centers will let the cam breathe a bit better at the upper end on the rpm range, so it satisfies your 5000 rpm requirement.

That old rat wont seem right idling at 550 rpm and 18.5" of vacuum! http://www.chevelles.com/forum/smile.gif

Hi Guys,
Thanks so much for the advice. I will
try the Ultradyne for the first time. 427L88,
the 114 centres seem to make sense with my
relatively high compression.
Jim, I intend to try the 3.31's first
since they are already in the car and I
don't have 3.08's yet. Remember I will only be pulling the 1700# rail ( 1962 said to be originally owned by Connie Kalitta) on an open trailer, so total trailer weight wouldn't be much over 2000#.
Thanks again guys !!

Hey, we want a pic of that complete rig! Couldnt be more cool!

------------------
Gene
ACES / CanAm Chevelles
67 SS 427 (http://www.chevelles.com/feature/october2000.html)

That Crane 272 .515 lift would be an excellent choice. I use to have that in my 454 and it idled with 16" of vaccuum and I could melt the tires at will with no converter and 3.36 gears.

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69 Malibu 406 3680lbs Turbo 350 2400 stall, 3.73,XE274, Performer RPM Q-JET, 800 Q-JET, Sportsman2 64cc 11TO1 12.65@105.5 mph

ACES Member #3635

In small block Chevies, the Crane 272 Energizer and my 272 LOOK different. They have the same valve lift, and mine is 1 degree fatter at .050", but we have enough high lift area that the 2 cams do not look similar.
I have not looked at a Crane 272 in a big block.

UDHarold

(My 272 in 454s gives 20-21" vacuum...)