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Discussion Starter · #1 ·
Hi guys I am looking for a replacement cam for my 350 chevy small block. My specs


350 sbc 9:5to1 CR
Dart Iron Eagle Ported 200cc heads milled to 69cc combustion chambers
block was decked 10cc
Quick Fuel 650 DP Q series carburetor
Edelbrock rpm performer air gap intake
Hei with 50,000 volt coil all timing in by 3000rpm
Forged flattop pistons.

I currently have a comb cam big mutha thumpr roller cam and it may sound good but it does not perform like comp says it does and it has over 34 degrees of overlap at 50 duration wich is too much for me engine.

The bmt cam is 243/257 @ 50 with 537/517 lift I believe. I don't take this thing to the track just a weekend type deal. I wanted to use a comp cam 288xr 236/[email protected] 50 with 520/540 lift but I don't like there cams being made of austempered iron. So I looked at isky's website and i found a relly nice cam that is almost like the comp cam but theres is billet steel and they state they can be used with stock type iron distributor gears wich I got.

It specs at 234/246 @ 50 with 530/550 lift. It has a 110 lsa with Intake open 7,Exhaust open 47, Intake closed 53, Exhaust closed 13, that is timing at 50 duration.I feel with only 20 degrees of overlap on the Isky cam will still give me a decent choppy idel with not being too much. I checked summit racing and there website does not have hardly any isky cams and jegs does not either. How long does it take to get a cam if ordered from Iksy themselves? I have never got one of theres before.

Will this cam give me at least 10 inces of vaccume at idle by chance? I only have 6 with the big thumper cam and for performance wise it sucks. It makes decent power but not what comp cam states it does and it sures the hell is not streetable like they claim it is. I want the cam to match good with what I got but have a nice choppy idle as well but not too much overlap. My oldest crane roller cam 234/242 @ 50 539/558 had only 14 degrees of overlap and was on 112 lsa and it was close but not quite what I wanted for the sound but it performed way better then the comp cam.

Thanks guys for your opinion.
Eriic
 

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The Isky cam sounds good. I used there cam in my 4.3 V6 and ordered it from there shop in cali, I`m in Bama and it got here pretty quick. I was also very pleased with there quality, prices and absolutely outstanding customer service. Ever since I went with Isky I`m sticking with them.
 

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eric32 said:
Will this cam give me at least 10 inces of vaccume at idle by chance? *snip* My oldest crane roller cam 234/242 @ 50 539/558 had only 14 degrees of overlap and was on 112 lsa and it was close but not quite what I wanted for the sound but it performed way better then the comp cam.
9.5:1 CR ain't much, but I believe you will be able to get at least 10 in/Hg vacuum w/the Isky cam.

The LSA won't help matters, but w/the reduced overlap from the M-F'er cam, you should be OK. The "sound" should be OK, as well- but I sure wouldn't let what it sounded like be what I chose a cam by.
 

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I can't say on vacuum, but I can say that you will see a big improvement over the thumper cam. I try to steer people away from that line as they are all bark and no bite- as you found out.
 

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cam

Here is what I would do. Look for a cam in the [email protected] range with a 110c/l.

I ran the numbers quick and with the cam you have now, you are looking at 161 psi cranking compression with a dynamic of 8.1

The isky will get you to 166 psi with a dynamic of 8.3

A [email protected] cam will get you to 173psi and a dynamic of 8.5. Thats about perfect for what you want to do. I promise this will give you all the vacuum that you need and a nice seat of the pants feel in you car.

I have run some 355’s with your compression and cams in the [email protected] range. There never as sharp as the same engine with the smaller cam.

This next statement is a for what it’s worth, and will probably start a huge wizzing match..

If the guy that ported those heads did not know what he was doing the cam isn’t going to fix it from being lazy. It will help but it will never be sharp like a set of heads that are done correct.

Keith
 

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k-star said:
Here is what I would do. Look for a cam in the [email protected] range with a 110c/l.

I ran the numbers quick and with the cam you have now, you are looking at 161 psi cranking compression with a dynamic of 8.1

The isky will get you to 166 psi with a dynamic of 8.3

A [email protected] cam will get you to 173psi and a dynamic of 8.5. Thats about perfect for what you want to do. I promise this will give you all the vacuum that you need and a nice seat of the pants feel in you car.

I have run some 355’s with your compression and cams in the [email protected] range. There never as sharp as the same engine with the smaller cam.

This next statement is a for what it’s worth, and will probably start a huge wizzing match..

If the guy that ported those heads did not know what he was doing the cam isn’t going to fix it from being lazy. It will help but it will never be sharp like a set of heads that are done correct.

Keith

There's a lot of truth in all of that, but a smaller cam will diminish your "sound". If you want the best performance you need even a smaller cam, your compression is too low to do well with the cam you speced, it will be noticably better witht he Isky cam, but not its best. How important is the sound vS the performance. If you want the best performance then go with Kstar, if you want the best middle ground the ISKY cam may be a good option.
 

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Maybe this will help>

We run this cam in my daughters 75 T/A , 350 sbc powered, it runs 12:60's in the 1/4 on motor and full, heavy trim weight. ( over 3800 lbs) It has great torque and will have the lopey sound and Vac your looking for > http://www.jegs.com/i/Lunati/638/00010LK/10002/-1

This one is in her 69 T/A and went 10:40 on motor in the 1/4, car is 2750 lbs and will still have some ok vac and the sound you want.>
http://www.jegs.com/i/Lunati/638/00012LK/10002/-1

These Lunati cams work great, i would recomend the 480/480 for your application, the 75 T/A that it's in is a street car now and has power brakes, with very good vac, it works great and sounds awsome. we use a set of Flowmaster delta 40's , X-pipe & 2.5 inch exhaust all thru on it, nice sounding combo. Didn't need the 3" as being used as a street car and the low end torque is awsome with this set up.

Hope this helps a bit.
 

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eric32 said:
Hi guys I am looking for a replacement cam for my 350 chevy small block. My specs


350 sbc 9:5to1 CR
Dart Iron Eagle Ported 200cc heads milled to 69cc combustion chambers
block was decked 10cc
Quick Fuel 650 DP Q series carburetor
Edelbrock rpm performer air gap intake
Hei with 50,000 volt coil all timing in by 3000rpm
Forged flattop pistons.

I currently have a comb cam big mutha thumpr roller cam and it may sound good but it does not perform like comp says it does and it has over 34 degrees of overlap at 50 duration wich is too much for me engine.

The bmt cam is 243/257 @ 50 with 537/517 lift I believe. I don't take this thing to the track just a weekend type deal. I wanted to use a comp cam 288xr 236/[email protected] 50 with 520/540 lift but I don't like there cams being made of austempered iron. So I looked at isky's website and i found a relly nice cam that is almost like the comp cam but theres is billet steel and they state they can be used with stock type iron distributor gears wich I got.

It specs at 234/246 @ 50 with 530/550 lift. It has a 110 lsa with Intake open 7,Exhaust open 47, Intake closed 53, Exhaust closed 13, that is timing at 50 duration.I feel with only 20 degrees of overlap on the Isky cam will still give me a decent choppy idel with not being too much. I checked summit racing and there website does not have hardly any isky cams and jegs does not either. How long does it take to get a cam if ordered from Iksy themselves? I have never got one of theres before.

Will this cam give me at least 10 inces of vaccume at idle by chance? I only have 6 with the big thumper cam and for performance wise it sucks. It makes decent power but not what comp cam states it does and it sures the hell is not streetable like they claim it is. I want the cam to match good with what I got but have a nice choppy idle as well but not too much overlap. My oldest crane roller cam 234/242 @ 50 539/558 had only 14 degrees of overlap and was on 112 lsa and it was close but not quite what I wanted for the sound but it performed way better then the comp cam.

Thanks guys for your opinion.
Eriic
Except for compression ratio and carburetor size, this engine is suffering from too much of too many good things. I guess the place to start is with the question, what do want to use this motor for? This is a good start on a race only motor or a really hot street engine that sacrifices everything to be first to the next traffic signal. This would not be a good engine for a tow truck.

Bogie
 

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engine

oldbogie said:
Except for compression ratio and carburetor size, this engine is suffering from too much of too many good things. I guess the place to start is with the question, what do want to use this motor for? This is a good start on a race only motor or a really hot street engine that sacrifices everything to be first to the next traffic signal. This would not be a good engine for a tow truck.

Bogie

I totally disagree... the only thing out of place could be the heads. (depending on how they were ported) Everything else is fine for a mild street application.

He is asking about the cam and that's the only thing i would change.

That engine with the correct cam would work perfect in a tow truck, unless the heads are ported way to big, with slow air speed.

Keith
 

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Discussion Starter · #10 ·
Whoa a lot of comments and advice and all is apprecitaed. This is not a tow truck but a hot street ride that is not a daily driver. My heads were ported by my dad who has built racing engines for the last 20 plus years and knows all the tricks of the trade like the back of his hand. As far as cam goes I want my cam for more then sound or else I would just leave the stupid big mother thumper cam in it. I liked the crane cam and it did perform really well. The comp big thumpr cam does perform just not like the should as claimed. I am wanting to have a nice choppy idle and performance to go along with everything to match decent. I know I don't have over 10 to 1 compression etc. But I did not want to go too high cause I had a previous motor like that before and had too many issues with pinging regardless of what I did too it.

I am not trying to race the thing just have a nice street rod that is a here and there drive and not all the time type deal. I feel my setup is matched really well minus the cam and maybe borderline on compression but good. I had previous motors with the same setup except with a weiand stealth intake and the old comp 292h cam and it ran excellent and it has more then the isky roller cam.

I will go with the Isky grind and it should run good since its not too far off from my crane cam I had. Just wanted a nice rumpy rump idle with the performance to go with it etc. Yeah you can say I am not matched up good enough. Well everybody has to have a stopping point somewhere. If its hte issue of getting everyting to be perfect then there is no such thing. I could go AFR heads bigger intake etc but I feel I am where I need to be except the cam and be able to run on pump premium gas and it not be overkill.

Thanks guys for the help and such all of you guys are appreciated here by me anyways and have helped me a lot over the last year. All take care
Eric
 
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