I need FAST answer

[weba]

I just noticed local performance parts shop is emptying the warehouse,

I'm looking at the following parts:

Crane '1.5:1 - 3/8 2.8-3.1L V6 Chevrolet Gold Race Roller Rocker Arms'
LINK!

Crane CAMS 254122
LINK!

Crane CAMS 253941
LINK!

Going for extremely cheap asap, so..

My engine is 1992 3.1 MPFI, witch i'm planning to do 3400 topend conversion, witch one of the cams would suit my needs better on this setup and can i use those rocker arms on that setup too?

Oh, and i do have emission testing here so.

Thanks for fast answers!

[MY91GT(Z)]

u can get the same type of cams from ben and also the rockers should still be available from him lil cheaper if im not mistaken. i think ur best bet would be the H-272 cam would be the better performer

[sir loin]

I thought the studs were 10 mm, not 3/8".

EDIT: Went to the link, there's an adapter

[weba]

Well i got the POWERMAX 2030 cam and rollers after getting suggestions @ PM.

Now i actually want to hunt a 2.8L to build, for better MPG and more power..

(fuel is 9-10 USDgallon here)

[1meanz]

2.8? do the 3.1 with 3400 top end. i went from 24 mpg highway(3.1), to 33 mpg highway(3400 top end on my 3.1) and between 27 and 29 mpg city (babying the hell out of it)

[Superdave]

dude, the powermax 2030 isn't much better then stock.. switching to 1.6 rockers would help out a little though

with 1.6 rockers it would be .451 in/ex lift.. 51 degrees of valve overlap which will yeild a lope at idle and moderate idle vacuum.

the H272-2 will have about the same idle vacuum, a little more lope and compliment the 3400 top end MUCH better. 3400 heads flow around 190 CFM at .420 lift, 200 CFM @ .450 lift and about 220 CFM at .500 lift.

[johnnymossville]

^^ Plus the 3400 heads have 1.6 roller fulcrum rockers on the stock.

[weba]

Oh someone could have mentioned about the rockers before i bought them... oh well...

This car is my DD, so i NEED to pass the emission testing, so i went with the smaller cam, just hoping to get Some more Go out of this thing..

I have my fully build Quad GTZ for performance & roadcource use

[Superdave]

with that much cam overlap your idle test might fail.. you'll have to tune the car for sure.

[weba]

For sure, i'm getting the Moates APU-1 for my GTZ allready, so i might just use it on this project too.

I haven't dealed much with pushrod engines before (only changed headgasket on 2.2), so this is going to be a lesson for me... None on my friends can help me either, we'r too young to know about pushrod engines (they stopped making these in europe at 1970's)

So, i'm most likely going to spend quite a while on this board now and learn

[torq455]

i've heard the 2030 is a waste of time. which i think is strange since it has more lift and duration than stock. stock cam has a 109 lsa and a smooth idle, but with bigger duration on the 2030, it might stumble some. the 272 would do great! not great on the emissions. go more like the crane 260 and bump the CR up some and you should be ok.

[weba]

What are the specs of stock cam?

[torq455]

i've heard a couple of different things. 179/184 .365/.395 lsa 109, or 184/195 same lift and lsa.

[Superdave]

Valve timing at .050”
Intake/Exhaust duration: 196/196 degrees
Intake valve open: 13 degrees after TDC
Intake valve closed: 27 degrees after BDC
Exhaust valve open: 29 degrees before BDC
Exhaust valve closed: 7 degrees before TDC
Intake lobe center: 109 degrees
Exhaust lobe center: 109 degrees
Intake Lift: .2626”
Exhaust lift: .273”
Lobe separation angle: 112
Rocker ratio: 1.5:1
Total effective lift with 1.5:1 rocker: .4095”

[weba]

Thanks for the specs, well looks like the 2030 cam should make some difference to those specs, not going to turn it into a space rocket, but help some and maybe pass the emissions too


My 3.1 just rolled over 100 000 mile mark & is in great condition... If i use this to put the new parts in, i'l just swap new gaskets... If i end up getting 2.8L, it's most likely on higher mileage and needs more work... hmmm

How long does the Oil & Water pumps live on these engines, should those be changed too?

Chain and guides maybe too? Gathering a list of things i need.