attn: desktop dyno people

[bubba428]

I need sombody to give me an idea on my new configuration.

std. bore 350 (3970010)
9.1:1 CR (with 72cc heads)
#416 heads (2.02/1.60 valves 60cc chambers)
110LSA .233/.242 duration .504/.525 lift cam
weiand team G single plane intake
holley 670 street avenger
long tube headers


and just for the people wondering
3000 stall
stock 700R4(it'll probably explode, planing for a B&M TH400)
what ever ring and pinion ratio the stock 4 link 8.5in 10 bolt has
and 255/60 15 futura GLS (launched a 2.0 in the T/A on stock TC)

[LTb1ow]

Why such a low CR?

[Featherburner]

Why such a low CR?Not that low with th 60cc heads he says he is using. Probably about 10.25 to 1.

[Jared1970Chevelle]

400 horse 400 torque at 5200 rpm....

but i dont think that is rite....

[WildBillyT]

Moved to the tech section, and shoveled the ****. Keep it on topic please.

[LTb1ow]

What do those heads flow?

[WildBillyT]

Bubba, did you mean 416 or 461 heads?

[The Fixer]

I still ask, are you sure it's an 8.5" 10-bolt? They only came in '84-'87 Turbo Regals and '84 Hurst Olds, and '85-'87 442s. If it's the original rear from your Regal, at best it would be a 7.5" rear with 3.08 gears; most likely it's got 2.41s or 2.56s though. If it's not original, then you gotta do some research; find out what it was from, or pull the cover and start counting teeth.

[bubba428]

Bubba, did you mean 416 or 461 heads?

#416 the 305 HO heads, stock 58cc but i had to have more room cut in them for the 2.02 valves

I still ask, are you sure it's an 8.5" 10-bolt? They only came in '84-'87 Turbo Regals and '84 Hurst Olds, and '85-'87 442s. If it's the original rear from your Regal, at best it would be a 7.5" rear with 3.08 gears; most likely it's got 2.41s or 2.56s though. If it's not original, then you gotta do some research; find out what it was from, or pull the cover and start counting teeth.

nah its really a 8.5 10 bolt. its a regal limited. the 7.5s were all torque arm set ups, this is a 4 link.

[bubba428]

Why such a low CR?
thats with the stock 72cc heads NOT the 60cc.

Not that low with th 60cc heads he says he is using. Probably about 10.25 to 1.
something like that

What do those heads flow?

not really sure. I know stock with 1.84/1.50 valves they flow 16xcfm. I'm guessing with the work done to them maybe, just a guess 200cfm. could be less could be more.

[WildBillyT]

Bubba,

It seems to me that you have a ****ed up combo.

Highway gears, medium/big cam, 305 Heads, single plane manifold. Looks like you have some high RPM parts matched with off-idle parts. How did this run in your firebird? Did that have low numeric gears?

[bubba428]

http://img175.imageshack.us/img175/4968/feb240001.jpg
thats what the 305 heads look like. I had them completely redone so they would run higher RPM. the T/A never got to see this set up.

the rear gears are getting swapped out soon, thats just a given. I know what I need to do with the rest of the car to work with the motor, right now i'm concerned with draining every last ounce of HP I can get with what I got

[Tru2Chevy]

nah its really a 8.5 10 bolt. its a regal limited. the 7.5s were all torque arm set ups, this is a 4 link.

False....My brother's G-body has a 7.5" 10 bolt (with 2.41s) with the standard 4 link....

Never seen a G-body with a factory tq. arm setup either.

- Justin

[bubba428]

i'll have to look again...i'm pretty sure its an 8.5

[LTb1ow]

Is this emissions friendly setup?

If not, maybe drop the LSA down a few degrees.

[bubba428]

emissons what??? lol I've been looking at a few cams I like the voodoo cams for various reasons

[bad64chevelle]

its telling me 257/338 @ 4k.

[The Fixer]

False....My brother's G-body has a 7.5" 10 bolt (with 2.41s) with the standard 4 link....

Never seen a G-body with a factory tq. arm setup either.

- Justin

Bubba, check out this link here - http://www.oldspower.com/vb/showthread.php?t=31398 - it's got pics of what the 7.5" G-body rear looks like compared to the 8.5" G-body rear. You'll notice two triangle-shaped tabs on the 8.5" in the pics in the link.

And Justin is correct, 99.8% of the G-bodies produced had a regular 4-link rear. Only the '87 Buick GNX got something different- they came with a Watts link setup.

[bubba428]

its telling me 257/338 @ 4k.

thats less than what i'm running now, with 9.1:1 and super crap heads

[bad64chevelle]

i put in all the info you gave me, not sure man. it does seem a bit mismatched to me

[Tru2Chevy]

i put in all the info you gave me, not sure man. it does seem a bit mismatched to me

Do you have a headflow file for those heads?

- Justin

[bad64chevelle]

I didnt realize you put 2.02s in those heads, i missed that. Re did it, and its telling me 335/387. Im not too sure

[NJSPEEDER]

False....My brother's G-body has a 7.5" 10 bolt (with 2.41s) with the standard 4 link....

Never seen a G-body with a factory tq. arm setup either.

- Justin

GNX was a torque arm car. As far as I know all others were 4 links.

[NJSPEEDER]

thats less than what i'm running now, with 9.1:1 and super crap heads

Do you have access to a 750 carb? With such a disparity between the torque and HP, even on a low rev'ing engine, it seems like the engine is running out of air. The larger carb would also help a bit by moving the torque and hp curves up the rpm range a bit.

Where did you get the heads done? See if you can get better flow information from whoever worked on them to help build a better model of the engine.

[bubba428]

Do you have access to a 750 carb? With such a disparity between the torque and HP, even on a low rev'ing engine, it seems like the engine is running out of air. The larger carb would also help a bit by moving the torque and hp curves up the rpm range a bit.

Where did you get the heads done? See if you can get better flow information from whoever worked on them to help build a better model of the engine.

I had them done at jarhead engines, he doesn't have a flow bench, but the only thing i really had him do was gasket match that open up the chambers for the bigger valves

[LTb1ow]

And your saying that the flow in the 200 range cause of that?

[WildBillyT]

Stock 416 flow data:

http://www.thirdgen.org/techboard/tech-general-engine/211455-416-flow-numbers.html

[Tru2Chevy]

Stock 416 flow data:

http://www.thirdgen.org/techboard/tech-general-engine/211455-416-flow-numbers.html

That's ported, not stock.

- Justin

[LTb1ow]

195cfm@.500 in.(182@.400") and 110cfm@.500 ex.

[WildBillyT]

That's ported, not stock.

- Justin

Bah. Posted the wrong link. I'll try and get the correct one back.

[bubba428]

ok, well to add info. its got -5.5cc pistons and 58cc heads, .060, (10.9:1 CR about) so now that 400 number is looking a bit more realistic...I can't wait to hit a dyno.