Dolph88sc350TPI

First off, I'm thinkin of getting one of 2 summit cams, the k1100 or k1101.
Are these decent cams for the price?
If not what would you recommend for about the same price?

This is what dyno 2k says my L69 had.

Dolph88sc350TPI

Here's the sum-k1100.....

Dolph88sc350TPI

and the sum-k1101.

btw, what is the stuff at the bottom mean exactly, what I would really like to know is.
What does the initial timing need to be set to?
And how much advance does a vaccum advance distributor give at most?

Sitting Bull

They are all way too tame for your 305.

Get a Crane PowerMax 260 or 266. Or a Comp XE256. All of these cams will run circles around the Summit stuff.

IVO BTDC=intake valve open in degrees before top dead centre

etc.

ronterry

I don't know 'Sitting Bull', I dig the torque numbers coming in at 2G's with that k1100...That sucker would be a little screamer around town.

Ron

e-man

The timing is for the cam if its advanced or retarded not the distributor.The other four numbers is the specs on the cam lobes.Then they open and close the valves.

Sitting Bull

DD2000 produces wacky torque numbers. Even the peanut cam shows well over 300 foot pounds of torque and that just ain't true.

nsimmons

You guys got to realize the numbers are from real thermodynamic formulas. They are gross out puts, with a perfect running engine, with no internal frictional loss. As someone whos worked out the math, desktop dyno is pretty close. Knock 25% off or so and you'll get numbers you can compare to gm's factory ratings.

Dont use it to get actual numbers, use it to compare changes with parts.

Dolph88sc350TPI

Well this is the XE256, tell me what you think....

Sitting Bull

Looks to me like it thrashes both of the Summit cams by a substantial amount, eh?

Dolph88sc350TPI

What about the XE250?, I'm looking for some low end torque.
And what other mods do you suggest I do before I put her back in?
Thanks for your feedback guys!

Sitting Bull

OK, here is what the gurus have told me.

-with a 305 you must consider your rear end gear ratio--if you have 2.73s you must go mild with your choice

-a looser torque converter will allow a lumpier cam--if you have the stock 1400 rpm stall converter you must go mild again

--you must keep lift below the .460 range if you have stock springs in the heads

If you have 2.73 gears and want low end torque then the Comp XE 250 and Crane PowerMax 260 are the ones you want. BUT ... the Comp cams are ground on a 110 LSA which is really meant for a 350 engine, not a 305. The Crane 260 is ground on a 112 LSA which works nicely with a 305.

If you have 3.23, 3.42 or 3.73 gears you can step up one grind to the Crane PowerMax 266 with a 114 LSA or XE 256 with a 110 LSA (not recommended for the 305). Of course, the higher the lift and longer the duration, the lumpier the idle and soggier the bottom end torque.

I have a 305 with a Performer intake, QJet, ported and polished heads, headers, Crane PowerMax 260 and 3.42 gears, and I find this cam is still a bit less torquey than the factory peanut cam on the bottom end, i.e., below 2500 rpm. But then it really walks away from the old cam and the 3.42s really compensate on the bottom end too.

All in all, I'd suggest the Crane PM 260 with .427 and .454 lift.

And if you can get a 2000 rpm stall torque converter, everything will work even better yet

Now I suppose you are going to tell me you have a stick???

firechicken_3

iTrader: (4)

i agree with sitting bull here, but i do have one thing to add, why on gods green earth are you using 750cfm of intake flow on a 305????????

check my sig, the motor has the enemic factory 8.5 to 1 compression ratio, or a little less cuz the head gaskets are thicker than stock

firechicken_3

iTrader: (4)

i agree with sitting bull here, but i do have one thing to add, why on gods green earth are you using 750cfm of intake flow on a 305????????

check my sig, the motor has the enemic factory 8.5 to 1 compression ratio, or a little less cuz the head gaskets are thicker than stock

firechicken_3

iTrader: (4)

i agree with sitting bull here, but i do have one thing to add, why on gods green earth are you using 750cfm of intake flow on a 305????????

check my sig, the motor has the enemic factory 8.5 to 1 compression ratio, or a little less cuz the head gaskets are thicker than stock

sitting bull keeps telling me to port the heads but i don't wanna put any more money in this 305 i am saving for bigger better things


i see i have posted this several times, if an admin could delete the extras i would appreciate it, since it won't let me do it myself

Sitting Bull

Yes, but you can reuse those massaged 305 heads on that new 350 or 400, and they will flow just like a nice set of Vortecs

The QJet on a 305 is rated at 750 cfm, even though it might only draw 600 cfm or so. Anyway, it is only a few hp difference one way or the other.

Dolph88sc350TPI

It's an auto, and I don't plan on running an aftermarket stall converter right now.
I'm running 3.42s in the rear.
Also what shift kit/and or/other mods would you recommend for my 700r4?
Oh yeah, does backpressure really help torque?

I'm glad you guys are here to help :hail:

Sitting Bull

Use the TransGo shift kit ONLY. The gurus here despise the B&M kit.

In my experience, I had more bottom end torque on the original LG4, with its tiny exhaust manifold and 2 inch pipes. But going to headers and a 3 inch exhaust more than made up for the extra torque under 2000 rpm.

3.42 gears also nullify any advantage below 2000 rpm that the original setup might have had.

firechicken_3

iTrader: (4)

yes back pressure helps somewhat, i lost my muffler one day, and the car felt really doggy, through what would be the 60ft range. then it picked up strong. i drove it like a couple days because i had to. i put a muffler back on and WOW, it was a noticable difference, my does not have a cat either, you may want to keep yours depending on emissions testing in your area. it will also provide a little sound deadening which may help keep the cops off your back, i have been warned repeatedly about mine. and lastly keeping the cat will provide a little back pressure as well,

but like sitting bull said, if you go all the way, big gears, loose convertor, and stuff, the loss of low end will be null.

when i did gears i went from 3.23 to 3.73, it was a HUGE wake up, some say i am over geared, but thats ok, because the future holds a high revving motor, and a 6 speed.

one other thing to remember is what you really wanna do with the car, and what might you do in the future, spend money on things that will transfer to a new engine say a 350 or whatever