Thread: engine help

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hey guys hows it goin. i have a gm 350 300 hp crate motor 9.1 1 cr im gonna put a set of DART IRON EAGLE Platinum series cylinder heads 64 cc 200 cc runner 2.02 valves springs good to .525" lift i also have a set of 1.6 roller rockers im looking for a cam for this engine i want a street strip engine ineed lowend tq but i would like a good bit of power id love 450 hp an close to that in tq. is this posible with out changine any pisons or any thing major like that i think the pistons have a slight dish to them. i will switch in take an carb as need thank you very much any info will help greatly.

p.s. this is my first engine on my own

john

Nice idea...you're headed on the right track. Be careful of the 1.6's because they change the geometry of your valve train and will wipe out valve guides and bang valves against pistons if you don't spend the time to check clearance and triple check pushrod lengths, etc. Good geometry all the way around is free horsepower and keeps you running a lot smoother as far as maintnance and breakdown. I don't see why your ideas wouldn't work to achieve your goal, just worry about all the geometry first. You're gonna have some fun.

Originally Posted by justmejohn71

hey guys hows it goin. i have a gm 350 300 hp crate motor 9.1 1 cr im gonna put a set of DART IRON EAGLE Platinum series cylinder heads 64 cc 200 cc runner 2.02 valves springs good to .525" lift i also have a set of 1.6 roller rockers im looking for a cam for this engine i want a street strip engine ineed lowend tq but i would like a good bit of power id love 450 hp an close to that in tq. is this posible with out changine any pisons or any thing major like that i think the pistons have a slight dish to them. i will switch in take an carb as need thank you very much any info will help greatly.

p.s. this is my first engine on my own

john

The 200 cc heads are to large.
I would try a set of 180 cc heads to 6,500 rpm's.
165 cc heads for less than 6,000 rpm's.

hey would this cam be a good match

http://store.summitracing.com/partde...3&autoview=sku

i think im starting to under stand how to match a cam.... i hope

Great "puller for a medium to heavy car. Poor vacuum at idle for accessories, a bit lopey but if you have a stick instead of an automatic, could work. If you're really going for the numbers you first mentioned, it will achieve them. To be a bit more tunable, degree the cam to the card they supply, make sure it has a good exhaust system and be patient with carburation because it will get sensitive to the combos you have. What are the heads? You sure you wanna go 200? I like the 180 idea mentioned earlier. Intake manifold will make a difference on idle to full band will make it change for sensitivity. Ignition curves will have to be painstakingly observed (be patient). Make sure you don't assume a plain jane valve job is sufficient. Too many machining process will go a long way towards achieving your goal. Geometry, geometry, geometry.....that's the key. A torque converter in your choice of automatic (if this is your set-up) needs to bit a touch loose compared to the stock one. Hope this helps.

Originally Posted by justmejohn71

hey would this cam be a good match

http://store.summitracing.com/partde...3&autoview=sku

i think im starting to under stand how to match a cam.... i hope

We need more info.
Car weight,gear ratio,man. or auto tranny,if auto. what is your stall speed?
Is the engine on pump gas?

ok hear we go
71 chevelle no power brakes

th350 full manual valve body

8.5 10 bolt posi 3:08 gears(i think) want to go to 3:73's

im looking at an nice b&m hole shot converter 3000

i would like pump gas only lookin for about 450 its just stock rods an crank

gonna get a set of DART IRON EAGLE Platinum heads probly the 180's will have 9.1:1

carb will be a 750 holley

not sure what intake (any ideas)

cam i was thinking of
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,300-6,500 RPM
Intake Duration at 050 inch Lift: 240
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 240 int./246 exh.
Advertised Intake Duration: 284
Advertised Exhaust Duration: 296
Advertised Duration: 284 int./296 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.507 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.510 in.
Valve Lift with Factory Rocker Arm Ratio: 0.507 int./0.510 exh. lift
Lobe Separation (degrees): 110
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.

exhaust is hooker comp headers with 2.5 into an xpipe then 2 flowmaster 40's just dump off no tails

ignition msd hei with 6al box

If you are using 1.6 rockers your lift will be a lot higher, make sure your springs are good for that amount. good luck.

That cam is way too big for the 9.1-1 compression ratio. You need to look for a cam that will work with what you have, or swap the pistons for 10.5-11 to 1 pistons to use the cam you listed. Look on the camshaft sites of comp and crane, they have minimum compression ratio's listed for each cam. A comp 270H magnum cam with .015" head gaskets would work good with what you have. Try that with the 180cc Dart heads.

9.1 compression with a 110 lobe seperation with 3:73 gears and a 300 stall. Could still work. He hasn't got power brakes and we still don't know who ground the cam. Might be milder than the spec card (most usually are). Any doubt, go with Elko's recommendation. And the .015 Gasket set up could give a slight help if cam is properly degreed. I'm assuming the existing squish is approximately .038-.044. Would be nice to have a bit more tech on the components.

Originally Posted by justmejohn71

ok hear we go
71 chevelle no power brakes

th350 full manual valve body

8.5 10 bolt posi 3:08 gears(i think) want to go to 3:73's

im looking at an nice b&m hole shot converter 3000

i would like pump gas only lookin for about 450 its just stock rods an crank

gonna get a set of DART IRON EAGLE Platinum heads probly the 180's will have 9.1:1

carb will be a 750 holley

not sure what intake (any ideas)

cam i was thinking of
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,300-6,500 RPM
Intake Duration at 050 inch Lift: 240
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 240 int./246 exh.
Advertised Intake Duration: 284
Advertised Exhaust Duration: 296
Advertised Duration: 284 int./296 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.507 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.510 in.
Valve Lift with Factory Rocker Arm Ratio: 0.507 int./0.510 exh. lift
Lobe Separation (degrees): 110
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.

exhaust is hooker comp headers with 2.5 into an xpipe then 2 flowmaster 40's just dump off no tails

ignition msd hei with 6al box

Take 20 degree's off the cam at .050 and you will be much closer.
Second get rid of the 750 carb. you won't need.
With the smaller cam you should be done at or before 5,500 rpms.
Look at the 600 vac. carb.