1978 4 bolt 350 block
stock crank
stock rods $150

clevite bearings $60

Fed Mogul Flat Top Pistons and Hastings Rings $80

416 heads (just need a cleaning) $60

Holley 1850 600CFM carb $free
(was going to use TPI, but thats on hold, i do have the TPI setup though)

help me choose a cam and an intake that will get me the MOST power out of what i have here
(the compression ratio is about 10:1)

and i am planning on shortie headers (prolly hedman's with the Y-pipe)

also, i just got a set of 1.6 roller rockers, not sure if they are going on this engine or into my 305 in the Z28, help me decide

oh yeah, since this is budget based i would like to stick with a flat tappet cam (i REALLY wanted a roller, but budget doesn't permit right now, maybe in the future, so recomend a nice roller cam too, say once i get the heads ported and valves enlarged)

thanx

 

Comp Cams Kit 268XE, comes with everything including springs and retainers for about $280 and double roller chain.

Weiand Stealth intake idle-7000 rpms or so, $145 or so now, I got it for $110 over the summer.

 

i put the 262 and the 268 through DD2000 and the 262 came out ahead

i was actually thinking about the weiand Xcellerator semi-single plane manifold says its good from 2000-6500 RPM

 

Well, if you want that intake, and the 262 cam, that's goin to be a mismatch I think. The cam makes power to about 5600 rpms or so right?

I'd really look into a dual plane intake, also , the stealth, claims to be a 2 in 1 deal as far as planes go, with it's wide powerband.

 

whats the RPM range on the 268 cam?
i think maybe the 268 will be the better choice once i get a chance to port the heads and whatnot

 

yeah it looks like the 268 will be the best once all the work is done.....i ran them both through DD2000 (although i know i shouldnt judge stuff by that- its become a bad habit though)

 

I believe the 268 is 1600-5800 rpms.

 

Your putting the cart before the horse.

None of these cams or intakes will work well with stock 416 heads.

Work the home porting and larger valves into your budget.
First then the cam choice while not be so critical.

If you have some decent head flow with reasonable port volume
( like a nicely ported large valved 305 head can provide)

then even a milder cam will make good power, but with stock low flow unmodified 305 heads the power will be severly limited no matter what cam and intake you choose.

Then base your cam choice on the converter and rear gear you'll be using, not what every one else thinks is the trick of the week.

A motor with more head flow and less camshaft will be much more flexable, better on gas and 9 times out of 10 faster.

 

The hedman y-pipe is 2.5 inches

 

your point is 100% valid and i understood this already, but in my situation, the cart has to come before the horse
oh yeah, my rear end is a 3.42 in this car and i am using a manual trans, so the converter is not a factor

 

Crane H-278-2 Or HMV-278-2 #113801

278/290 222/234 @.050" .467/.494" 114LSA

Either a Professional Products #52021 "Typhoon" intake
or a Edelbrock Performer RPM Or Weiand Stealth. #8016

 

What kind of HP are you aiming for?
Just curious cus I just picked up a 350 4 bolt main for my pickup but I think I might build it for the GTA.......

 

...and where do you want your power? If you're planning to go with the TPI in the future, the 262 may not be suitable. If you want to sacrifice low-end torque for upper RPM horsepower, that's a different story.

 

I am building a budget 350 to.

I bought the motor for 300 bucks.Which is steep except I knew the motor ran good and didn't smoke had good oil pressure all that.My buddy had it in his nova.And swapped in a more modified 350.

It is a 79 350 4 bolt main.Still on the stock bore with stock pistons.I am running a comp cams 270H with comp cams lifters and double roller timing set.A melling high volume oil pump.I have a set of 906 casting vortec heads that are going to the machine shop in a couple of weeks for screw in studs,bigger valves,new seals,the matching valve springs for the cam,etc,etc.

I plan on running an airgap intake with a holley 650DP.A MSd distrubitor.Hooker 1 5/8 primary super comp headers.I am hoping for 375-400hp.I am going to run an electric water with manual steering to help to.


I just ordered another 112 dollars worth of stuff from summit tonight.I think I need to throw that catalog away!

 

about the 2000-6000 RPM range

i thought about the cam interfering with the TPI, not sure what i really want to do in the future, but now is what matters so, thats out of my worries

i would like to rid of the T5 in the future and put in a T56
also a disc/posi rear with 4.10's (offset by the dual overdrive in the T56)

when all is said and done, this wont even be my daily driver anymore, cuz hopefully i'll have a 4x4 by then

i need one with all the big stuff i''ve been moving around

head work is in the future, but i honestly can not fit it in my budget at the moment............

 

heh, nobody seems to wanna jump on the bandwagon with me and put a XE292 or XE284 and victor jr on...i'm gonna start feeling left out

 

heh, the heads i'm using are barely gonna support a 268, nevermind something with that much duration and a TRUE single plane manifold

 

I calculate your compression at something closer to 10.6:1 with that combo of parts, BTW.

A slightly larger cam might help you bleed down some of that cylinder pressure. You're definitely gonna be marginal with stock iron heads and pump gas, maybe beyond marginal.

 

i just re-calc'ed it


a hair below 10:1


the spec for the pistons is 9.35:1 with 64 cc heads

the heads i am using are 58cc

i plan on using .040 thick head gaskets with a 4.125 bore

 

Im not saying your wrong or anything mark, so dont think im trying to disprove you

Im starting to wonder about the rpm ranges that are stated in the advertisments. I dont believe the xe262 runs out of steam at 5600 rpm's. Ive revved the crap out of my motor just to see what would happen and It pulled pretty hard a little ways past 6200 without a fart or anything. I wouldve taken it further, you know just to see what would happen, but I didnt want the lifters to start floating.

Sorry for mis-using your quote, but i figured id just throw this in the mix. You know, just to see what would happen.