Author Topic: Off the shelf Comp cam choice for 403 (Read 11301 times)

Gold member · « **on:** June 07, 2021, 08:10:15 PM »

What's your thoughts on these two Comp Cam choices .

https://www.compcams.com/thumpr-226-241-hydraulic-flat-cam-and-lifter-kit-for-oldsmobile-260-455-cpg.html?utm_source=Browse%20Abandonment&utm_medium=flow-email&utm_campaign=Email%20%231%20%28VDawhL%29&_ke=eyJrbF9jb21wYW55X2lkIjogIlJ6eVZpWiIsICJrbF9lbWFpbCI6ICJqaW1wYXNzYUBzYmNnbG9iYWwubmV0In0%3D

https://www.compcams.com/xtreme-energy-224-230-hydraulic-flat-cam-sk-kit-for-oldsmobile-260-455.html

Wallington · « **Reply #1 on:** June 07, 2021, 08:43:05 PM »

to suit what?

Gold member · « **Reply #2 on:** June 08, 2021, 09:27:38 AM »

Sorry sometimes I think people can read my mind LOL of course my mainly stock 403 Oldsmobile engine still with the stock cam in it from 1979 just looking to make it maybe sound a little better and improve torque and a little more horsepower.only other thing added to the stock motor is the number seven heads to increase compression

Gold member · « **Reply #3 on:** June 08, 2021, 01:03:27 PM »

Spoke to Lunati this is what they recommend . I really like the guy that helped me he explained the difference between comp and Lunati . https://www.lunatipower.com/voodoo-hydraulic-flat-tappet-cam-lifter-kit-oldsmobile-v8-262-268.html

Gold member · « **Reply #4 on:** June 08, 2021, 05:54:13 PM »

Lunati on the way will see . No negative coments please. Will report when In

« **Reply #4 on:** June 08, 2021, 05:54:13 PM »

olds403 · « **Reply #5 on:** June 08, 2021, 08:13:49 PM »

You will like the lunati. that is an older Harold brookshire grind that he did. He was Ultradyne.
What are the rest of the combos on the car ? Are the early 350 heads on it now ?
You are at the limit of the cam before all hell breaks loose for many reasons.

Gold member · « **Reply #6 on:** June 09, 2021, 09:03:38 PM »

Thanks for the input 403. I have owned the car for 7 years now it seemed to be all original. I added the number seven heads along with adjustable valve train very clean inside looks as though it could have had some work done in the past the car has 98000 miles on it. Big difference with the extra compression I just figured might as well do the cam also. I have it all tore down just waiting for the parts to arrive should be back together and running hopefully by the weekend

Gold member · « **Reply #7 on:** June 10, 2021, 12:31:57 PM »

Spoke to Lunati by phone this is with there sales manager . We discuss the best cam for my application and i would order it on line sounds simple. I place the order cam lifter and chain receive conformation of the order my money was taken . I noticed no shipping information so i email no response. Today i call to check on it the cam is on back order and they cant tell me when it will be available just that i am way down on the list. Of course i had to ask why are you selling a part that you dont have in stock and taking peoples money. The guy gets nasty with me i dont understand there parts supplier was shut down for three weeks for Covid . I wasn't calling to get another schooling about covid problems just why wouldn't you tell your customer it is on back order like on Summits Racing site . Long story short guess it wont be running this weekend no idea when it will ship and no one else has it . Do i go with a comp cam or wait that is the question now .

Gold member · « **Reply #8 on:** June 10, 2021, 12:59:45 PM »

Only other choice what do you think Comp Cam https://www.summitracing.com/parts/cca-cl42-600-5#overview

olds403 · « **Reply #9 on:** June 10, 2021, 09:42:05 PM »

I would bite the bullet and run a roller if you can find one. It would cost you more, but better all around. Will need different springs.
Contact Mark Remmel at new Olds performance he is a lunati dealer (863) 206-3320
He had a couple of rollers from what i recall

Gold member · « **Reply #10 on:** June 11, 2021, 09:11:36 AM »

Quote from: olds403 on June 10, 2021, 09:42:05 PM

I would bite the bullet and run a roller if you can find one. It would cost you more, but better all around. Will need different springs.
Contact Mark Remmel at new Olds performance he is a lunati dealer (863) 206-3320
He had a couple of rollers from what i recall

Just sent him a message Thanks again 403 . Only one Thumper cam left in the country at Summit . I am going to buy it just to be safe would like to drive my car this summer . The story Lunati has is just incredible not having any raw material to work with . I noticed the same thing buying the adjustable rockers from Comp sold out everywhere . Lets hope thing will come back inline in 2022

timfarn · « **Reply #11 on:** June 11, 2021, 01:51:50 PM »

Either of those cams will make power, you will know there is a cam in it as well. A little higher stall would not hurt.

Gold member · « **Reply #12 on:** June 11, 2021, 02:56:47 PM »

Quote from: timfarn on June 11, 2021, 01:51:50 PM

Either of those cams will make power, you will know there is a cam in it as well. A little higher stall would not hurt.

I was excited to have the extra compression with the #7 heads . I guess anything will be better than the stock cam . So far a very inexpensive noticeable increase in HP. Cam will be here Tues day should be running for next weekend car show i hope .

olds403 · « **Reply #13 on:** June 11, 2021, 09:54:37 PM »

You will have problems with that cam. Its huge on the exhaust duration 241 @.050 and at 107 lobe separation, What will happen is you wont have much vaccum for power brakes. Brakes wont work unless you go to hydroboost or manual brakes. I bet it will be between 10-12 inches best case with so much exhaust duration. Will will sound like it barely idles. Before you get too far as it appears cams are hard to get....andy iis the owner of OLDSPERFORMANCE PRODUCTS.

https://oldsperformanceproducts.com/product/camshaft-hydraulic-tappet-222-22810/

The other place to try is john at rocket racing

https://shop.rocketracingshop.com/Hydraulic-Flat-Tappet-Cam-Oldsmobile-V8-276-286-LUN10420313.htm

I did text with Mark earlier today. He has a couple of super expensive rollers.

Gold member · « **Reply #14 on:** June 12, 2021, 07:52:55 AM »

Quote from: olds403 on June 11, 2021, 09:54:37 PM

You will have problems with that cam. Its huge on the exhaust duration 241 @.050 and at 107 lobe separation, What will happen is you wont have much vaccum for power brakes. Brakes wont work unless you go to hydroboost or manual brakes. I bet it will be between 10-12 inches best case with so much exhaust duration. Will will sound like it barely idles. Before you get too far as it appears cams are hard to get....andy iis the owner of OLDSPERFORMANCE PRODUCTS.

https://oldsperformanceproducts.com/product/camshaft-hydraulic-tappet-222-22810/

The other place to try is john at rocket racing

https://shop.rocketracingshop.com/Hydraulic-Flat-Tappet-Cam-Oldsmobile-V8-276-286-LUN10420313.htm

I did text with Mark earlier today. He has a couple of super expensive rollers.
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I did speak with Mark the other day. I am going to run the com cam just to get me through the summer then work with him over the winter to fine tune what i need . Nice guy thanks for the referral. Now if i can only get my money back from Lunati they wont answer emails and cant get them on the phone .

« **Reply #14 on:** June 12, 2021, 07:52:55 AM »

Gold member · « **Reply #15 on:** June 17, 2021, 11:36:20 AM »

Well 403 the Com Cam is in and your right not a good choice but should get me through summer. Runs good idles good has plenty of vacuum but dies out when you put it in gear if you dont feather the gas . I will get back to Mark in the fall and order the correct one .

Gold member · « **Reply #16 on:** June 17, 2021, 03:31:52 PM »

Just got back from test drive . I will say this big improvement over stock cam left the drive way spinning tires and that never happened before . The exhaust sounds impressive that's for sure . Comp Cam shows no need for transmission converter change i think that's the problem dies when you put it in gear .

Wallington · « **Reply #17 on:** June 18, 2021, 12:58:56 AM »

You possibly need to stomp on the pedal to keep it from stalling too, another reason it spins the wheels instead of just driving away casually with stock setup!
So which cam is this in it now? And just the head swap otherwise?

Gold member · « **Reply #18 on:** June 18, 2021, 11:54:18 AM »

# 7 heads adjustable valve train and thumper cam . All stock with 90 K ran smooth with original cam no issues with stalling when in gear. I only put this cam in because of the material shortage for cam shafts everything is out of stock . If this was in a manual transmission car it would probably be fine .
https://www.summitracing.com/parts/cca-cl42-600-5#overview

olds403 · « **Reply #19 on:** June 18, 2021, 09:02:07 PM »

You will need a decent convertor 2800-3200 and more fuel at idle. If you run a cam bigger than around 225 duration it will need a convertor. Brakes probably need some help. Hydroboost is in your future.

Gold member · « **Reply #20 on:** June 19, 2021, 06:08:03 AM »

Quote from: olds403 on June 18, 2021, 09:02:07 PM

You will need a decent convertor 2800-3200 and more fuel at idle. If you run a cam bigger than around 225 duration it will need a convertor. Brakes probably need some help. Hydroboost is in your future.

No way this POS is coming out . Mark has something in mind i just need to take a break for a bit. Thanks again for your help and referral .

olds403 · « **Reply #21 on:** June 19, 2021, 03:38:56 PM »

No problem anytime. I have a spare 403 block/short block at Marks place. Will sell it and my BB edelbrock heads there too. Have other stuff at his place and here too. I am DONE !

Gold member · « **Reply #22 on:** July 21, 2021, 06:13:22 AM »

Things didn't work out with Mark but we should be running again with a Engle Cam JM 18-20
Street Cam, 1000-5000 RPM Range
0.488 Intake lift / 0.496 Exhaust Lift
260° Advertised Intake Duration/266° Advertised Exhaust Duration
216° Intake Duration @ .050 / 226° Exhaust Duration @ .050
112° Lobe Separation

Gold member · « **Reply #23 on:** August 04, 2021, 06:10:57 PM »

On the road again with a engle cam JM-18-20 cam pretty mild but a improvement over stock for sure .

olds403 · « **Reply #24 on:** August 06, 2021, 08:11:43 PM »

Yep....been there done that.

« **Reply #24 on:** August 06, 2021, 08:11:43 PM »

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Author Topic: Off the shelf Comp cam choice for 403 (Read 11301 times)