1977transam

iTrader: (2)

Well yes I finally got the wifes SBC for her 86 TA done and Dynoed as of last night.


combo as follows
350 4 bolt truck motor
bored .020 over.
stock crank balanced.
stock rods
stock replacement pistons
trickflow 195cc heads 64cc cnc chambers
comp cams xe284h cam,
crane 1.6 full roller rockers
edelbrock rpm air gap intake
650 mighty demon carb (first 4 runs on the dyno, they used they holley with a 3 inch spacer.)

compression is right around 9.7:1

the Motor spun with in single digets of what i fig out on desktop dyno.

of an average of 8 runs
412 @ 4100 TORQUE
405 @ 6100 POWER

best from the runs
420 @ 4300 TORQUE
406 @ 6100 POWER

http://videos.streetfire.net/video/7...1f0098fcf2.htm

http://videos.streetfire.net/video/b...1f009c9c3a.htm

booboosean

Looks like you found a good combo that netted some good numbers. The only thing I question is a 3-inch carb spacer on an RPM air-gap manifold. The plenum volume was increased enough with that spacer to move the peak numbers up in the RPM band. Do you have Dyno numbers with and without the spacer? Just curious.

That motor should "motorvate" your wife's car pretty well. Sounds like a good street combo. Hope you got something in the '77 that'll keep up!

Later,
Boo.

Sonix

iTrader: (1)

I would think that cam would boost the RPM range higher then that... hmm, interesting.

Good setup, with mostly stock internals it doesn't sound like that would break the bank either.

1977transam

iTrader: (2)

Yes I have numbers with and with out there carb and spacer. they always break engines in with there carb. there carb has the 3inch spacer on it. they ran 4 runs with that set up adjusting the timeing a little till they found what the motor likes. We then put my mighty demon 650 on it ran 2 runs rejetted itabd nade 2 more runs. The power band didn't shift that much and there wsn't much of a gain with the spacer. But the Torque curver didn't change alot with the spacer. but it made a fair amount more torque with out the spacer.

Well her TA needs a trans and exhaust yet to finish it up. But she has given me the green light to build my 473 poncho in the next year or so for the 77.

1977transam

iTrader: (2)

It's not a high dollar motor by any means. But it sound nice and made decent numbers. the true test will be if the wife is happy and if it putts down good numbers on the track.

five7kid

iTrader: (14)

Powerband and peak power RPM are 2 different things.

However, I would think a 750 carb would up the peak #'s a bit.

(The video links aren't working for me.)

1977transam

iTrader: (2)

I called Demon and gave them all the spec's they told me what to use. so thats what i bought

repost of video links
Video - NEW ENGINE WARMING UP ON THE DYNO

Video - Engine making a nice strong run on the dyno

five7kid

iTrader: (14)

What size was the Holley?

Tech lines tend to under-recommend, just to keep people from over-doing it. Same with cam companies, Comp recommended an XS274 for me, I heard from TGO members to try the XS282, it performs just as people here said it would.

1977transam

iTrader: (2)

It was a 650 Holley

five7kid

iTrader: (14)

I have no doubt that a 750 CFM would produce more power from the start of the cam powerband on up.

But, the 650 certainly is putting out some serious grunt.