350cortina
Forum Newbie
Posts: 10
Age: 27
Loc: Durban,South Africa
Reg: 06-13-12
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06-15-12 05:36 PM - Post#2237594
hi people,i have the following stuff in my 350 motor & would appreciate some advice & would u guys also give me some approximate power outputs from the specs supplied.
350 sbc.
0.30 flat top pistons with 4 valve relief & standard deck hieght.
Melling M55 oil pump.
Edelbrock E-Street 64cc alloy heads:2.02/1.6
Isky 292 flat tappet hyd cam.
Edelbrock lifters.
Procomp 1.5 ratio full roller rockers.
Double roller chain.
LT1 hi rise alloy inlet:snowflake casting mark.
1 inch carb spacer.
600 or 750 VS Holley carb.
Factory Delco-Remy electronic dizzy.
TH350c tranny.
3.08 diff.
Trye size: 205/45/17.
Thanks in advance.....
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bobb
Super Senior Member
Posts: 4628
Loc: paradise
Reg: 09-05-03
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06-15-12 10:11 PM - Post#2237684
In response to 350cortina
whats it in? do you need that much rear gear? with that cam it would seem soggy from a dead stop depending on what convertor you have in it. what head gasket do you have in it? did you measure the deck height or just assumed it?
| 70 L camino 350 all forged,174 baby blower, g-force 5 spd, road rage suspension. Pray first before all else fails. |
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greg_moreira
Very Senior Member
Posts: 3262
Reg: 10-06-03
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06-15-12 10:22 PM - Post#2237689
In response to bobb
what size are those E street heads? I could be wrong but I believe they come in two different port configurations.
Also, I agree on the gears. That is not nearly enough gear for that camshaft. Although...Id like to know more about the cam. Valve lift and duration at .050 would help much more, or even the actual part/grind number.
But either way, a 292 camshaft in a 350 NEEDS more rear gear or it will be real soft and basically a pig out of the hole.
Should have at least a 3.73 but Id personally go straight for a 4.11. A stock converter wont fare too well either. Id want a quality converter of at least 3000rpm stall speed. Even though it has potential to be a fun combo and Id guess make in the 375 plus horsepower range with a real good tune....its not going to act like it with that drivetrain.
Keep a very close eye on those rockers. Those are basically cheap, china knock offs and they do not have a reputation for lasting very long. Many reported cases of busted rocker bodies, or the roller tip coming apart in just a few hundred miles.
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350cortina
Forum Newbie
Posts: 10
Age: 27
Loc: Durban,South Africa
Reg: 06-13-12
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06-16-12 03:22 AM - Post#2237722
In response to bobb
Did not measure the deck hieght but spoke to previous owner and he says that they not deck the block. Felpro gaskets. Thanks
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350cortina
Forum Newbie
Posts: 10
Age: 27
Loc: Durban,South Africa
Reg: 06-13-12
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06-16-12 03:36 AM - Post#2237724
In response to greg_moreira
Head part no# 5089.They say the head can only handle 5500 rpm,do u think we can push it to about 6500 rpm with the std vavle springs?
Isky cam part no# 201292...244/244 @ 0.50...0.505 lift @ 0.50...108 lobe seperation. Im using the stock converter & stock 3.08/1 diff for now but will upgrade both in about 6 months or so. The TH350c has a shift pack installed. & i will also be using the 600 VS holley for now aswel. How bad wud u say the performance to be. Will i break anything if i dont use a 3000 rpm stall converter now or can it wait. This is my 1st performance build so i wud appreciate as much info and advise as possible.
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greg_moreira
Very Senior Member
Posts: 3262
Reg: 10-06-03
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06-16-12 08:10 AM - Post#2237789
In response to 350cortina
You wont break anything....it just wont run nearly up to par without changing the gears and converter.
We have all built one like that. They run well from a 40 or 50 mile per hour kickdown, but off idle....it will be a turd.
As far as the valve springs go, the info I have says 125lbs on the seat and 320 open at .500 lift. That cam is .505. Were splitting hairs, but you should see most of that 120 lbs open.
Actually if thats accurate, pressures like that are good enough to make a little more than 5500rpm. Especially with an older school cam with gentle lobes(which is what that isky is) it wont be too demanding on valve springs and it should sail to 6000rpm or better. Now...I have been told that the studs put in these heads arent the highest quality. People are braking them if they put any amount of real valve spring to them, so this may be the reason for the precaution. If things go wrong it may be likely that the rocker studs give up on you.
Here are the issues you will have however.
That camshaft is gonna make very little vacuum. At least I suspect not quite enough to operate power brakes. If you have power brakes, this thing will be a bear in traffic.
It will cam hard with a camshaft that large, and since it will be bucking up against a stock converter....its gonna shake the car hard. And with minimal brakes....she is really gonna wanna shake and surge and such when you are stopped.
A larger converter would let it freewheel better at idle so that the loping cam doesnt feel like its trying to shake the car or lope thru the brakes.
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350cortina
Forum Newbie
Posts: 10
Age: 27
Loc: Durban,South Africa
Reg: 06-13-12
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06-16-12 09:05 AM - Post#2237804
In response to greg_moreira
Thanks Greg,that explains alot. I was also a bit worried about the brakes but i guess a conversion comes with these hiccups. Do u think that the 600 VS is gonna starve the motor on the top. Can the carb be re-jetted to supply enough fuel? Is there any cheap tricks u can give me to up the engine bhp?
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busterrm
Contributor
Posts: 999
Loc: Wichita Falls, Tx
Reg: 08-31-10
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06-16-12 11:17 AM - Post#2237841
In response to 350cortina
I looked at isky cams site. That cam is 505 lift, 292 adv duration, didn't see dur at 050, rpm range is 2800 - 7000, 4.11 -4.56 gear is suggested, 780 cfm. I am thinking the dur @ 050 is in the 240 - 250 range.
You will definitely need more gear, at least 3.73 and 4.11 would be better.
Oh I didn't see his listing the cams specs above, I was right though, 244 dur at 050.
==== BOB ====
If I can't smoke the tires I want more!
1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2005 Yamaha Vstar 1100 midnight custom |
Edited by busterrm on 06-16-12 11:46 AM. Reason for edit: No reason given.
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busterrm
Contributor
Posts: 999
Loc: Wichita Falls, Tx
Reg: 08-31-10
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06-16-12 12:03 PM - Post#2237853
In response to busterrm
I would drop to a cam with less duration, say something 220 - 230 range, and with a wider LSA, 110 or 112. Lunati voodoos are pretty good cams. I am using a 60103 in two SBC engines I built. Duration is lower, lift is 489/504, rpm range 18-6200, LSA is 110 which would be more auto tranny friendly. Stall is suggested at 2400 rpms. I think it would match your heads better too, peaking at 500 lift. Add a Eddy performer RPM intake and it would be more streetable.
==== BOB ====
If I can't smoke the tires I want more!
1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2005 Yamaha Vstar 1100 midnight custom |
Edited by busterrm on 06-16-12 12:05 PM. Reason for edit: No reason given.
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 navygunner08
"2nd Year" Silver Supporting Member
Posts: 644
Loc: New London, CT
Reg: 02-13-11
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06-16-12 12:07 PM - Post#2237855
In response to busterrm
I agree with Bob. You will be much happier with a shorter duration cam and you need to match your converter and rear end gearing
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busterrm
Contributor
Posts: 999
Loc: Wichita Falls, Tx
Reg: 08-31-10
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06-16-12 12:24 PM - Post#2237859
In response to navygunner08
I am not trying to tell you what to do, but you'll have several issues with the big cam your planning. Vaccum down(power brakes), rpm range is up(fighting against stock converter), tight LSA making it hard at idle.
You don't have to go wit Lunati as I suggested, just something that is not as aggressive. The one you are planning is a borderline strip cam, its rpm range starts at about where most street engine criuse.
With a shorter duration, you'll have better vaccumm, lower rpm range, and a wider LSA would help at idle. You won't have the surging and bucking when your stopped.
==== BOB ====
If I can't smoke the tires I want more!
1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2005 Yamaha Vstar 1100 midnight custom |
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busterrm
Contributor
Posts: 999
Loc: Wichita Falls, Tx
Reg: 08-31-10
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06-16-12 12:33 PM - Post#2237862
In response to busterrm
Suggestion, like Greg suggested, I would change the rocker studs to ARP studs, and get a better set of roller rockers. Compcam magnum roller rockers are good.
==== BOB ====
If I can't smoke the tires I want more!
1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2005 Yamaha Vstar 1100 midnight custom |
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busterrm
Contributor
Posts: 999
Loc: Wichita Falls, Tx
Reg: 08-31-10
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06-16-12 12:36 PM - Post#2237864
In response to 350cortina
Thanks Greg,that explains alot. I was also a bit worried about the brakes but i guess a conversion comes with these hiccups. Do u think that the 600 VS is gonna starve the motor on the top. Can the carb be re-jetted to supply enough fuel? Is there any cheap tricks u can give me to up the engine bhp?
A properly tuned 700 cfm carb should be just about right.
==== BOB ====
If I can't smoke the tires I want more!
1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2005 Yamaha Vstar 1100 midnight custom |
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350cortina
Forum Newbie
Posts: 10
Age: 27
Loc: Durban,South Africa
Reg: 06-13-12
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06-16-12 12:59 PM - Post#2237872
In response to busterrm
Im happy with your responses guys. I hav an edelbrock performer rpm cam aswel but i opted for the isky cos i always fancied a choppy idle.I am definately gonna change the converter & differential in a few months or hopefully dump a manual tranny in it. This car is basically driven twice a week & will rarely do more than a 100 miles a week & i would like to race it about once in 2 months or so. So im basically buildin it for jus me to drive & enjoy. Do yourll think a smaller duration cam with a tight lobe seperation will be better,to make proper noise but good street manners?
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busterrm
Contributor
Posts: 999
Loc: Wichita Falls, Tx
Reg: 08-31-10
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06-16-12 01:56 PM - Post#2237892
In response to 350cortina
wider LSA, 110 or 112 would be better. That is still a lot of cam for a 355, spinning up to 7000 is really too high for a stock block. Depending on what converter is stock for that car, you might get away with a cam that will run with a stock converter. The Lunati 60103 cam can run a 2400 and be happy. The ededlbrock performer RPM cam still has a lot of duration, I would opt for a cam that is in the 220 -230 range.
==== BOB ====
If I can't smoke the tires I want more!
1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2005 Yamaha Vstar 1100 midnight custom |
Edited by busterrm on 06-16-12 02:02 PM. Reason for edit: No reason given.
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 MikeB
Senior Member
Posts: 9389
Loc: Plano, TX
Reg: 08-28-03
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06-16-12 07:58 PM - Post#2238039
In response to 350cortina
I second what the guys above said:
That 292 cam is 2-3 sizes too big for for a 3.08 axle and the rest of your parts. It will perform miserably below 2500-3000 RPM.
Isky's description:
High performance use/bracket racing. Rough idle. 2800 Stall. 10-11:1 compr. 4.11-4.56 axle ratio.
Up to 780 CFM Carb.
Given your 3.08 gears and heads, I'd go for the 201262/270-12 cam which is 262/270, 208/216. It will be lots more fun to drive and still let the engine rev to 5500-6000 with good springs.
Isky's description of 201262/270-12:
Excellent performance cam with good vacuum, good
idle. 3.08-3.73 axle ratio, 9.5:1 compr. Up to 650
CFM Carb. Computer compatible. Stock converter. Sounds perfect for your car. 
I would definitely scrap the ProComp rocker arms. They're an accident waiting to happen, IMO.
I'd also start by using a 5/16" - 1/2" heat insulating spacer instead of a 1" aluminum spacer.
A 650 vacuum secondary carb should be about right. Of the two you listed, I'd go with the 600. It's better to err on the small side when it comes to cams and carbs for a street engine.
Real Hot Rods have a Clutch!
1955 210 2dr: 327, Brodix IK180 heads, Jones cam, Muncie M20, Wilwood front brakes
1969 C-10 pickup: 350, TH350
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Edited by MikeB on 06-16-12 08:04 PM. Reason for edit: No reason given.
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busterrm
Contributor
Posts: 999
Loc: Wichita Falls, Tx
Reg: 08-31-10
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06-16-12 11:28 PM - Post#2238108
In response to MikeB
I do agree I did some more calculations, with your heads you would be at the end of your flow numbers if you went any larger than a 650. The 600 would work well, you might have to richen it on the jets a notch or two and on the secondary side with power valve and open the restrictors. But it should work okay.
==== BOB ====
If I can't smoke the tires I want more!
1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2005 Yamaha Vstar 1100 midnight custom |
Edited by busterrm on 06-16-12 11:28 PM. Reason for edit: No reason given.
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