Cam for stock ‘71 402 - Page 2 - Chevelle Tech
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post #16 of 35 (permalink) Old Oct 20th, 19, 1:47 PM
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Re: Cam for stock ‘71 402

Id guess wtih a stock converter and your gearing it may be a little iffy

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post #17 of 35 (permalink) Old Oct 20th, 19, 2:22 PM
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Re: Cam for stock ‘71 402

From mildest to wildest:

https://www.summitracing.com/parts/c...make/chevrolet

https://www.summitracing.com/parts/c...make/chevrolet

https://www.summitracing.com/parts/c...make/chevrolet

With a heavy tank, no compression and no gears, forget about anything over 5000 rpm, you need everything downstairs you can get.

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post #18 of 35 (permalink) Old Oct 20th, 19, 3:16 PM Thread Starter
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Thanks Eric, I’m liking the one in the middle.
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post #19 of 35 (permalink) Old Oct 20th, 19, 9:14 PM
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This https://www.summitracing.com/parts/crn-133901/

1000-4800 powerband. Good duration split for factory heads and restrictive exhaust.
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post #20 of 35 (permalink) Old Oct 21st, 19, 12:52 AM
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Re: Cam for stock ‘71 402

That cam calls for 9.5-10.5 compression. and some gear.
But is that because they want their cam to impress you so they do not get a bad rap.

That is the thing about camshafts. They will get blamed for bad performance ..when it could be the rest of the parts.

It is nice if someone ran the EXACT same combo you have and can tell you this is good and this is junk.

That is hard to do really.

My friend at the cam shop told me I change cams like he changes underwear
Yea I like to try things.
But one thing I learned when I was 18 or 19 I need to run ported heads.

That cam in the link is [email protected] .050
I have ran 224 at .050 single pattern and it was a little down on power vs my [email protected] .050 in a 350".
Made up for it past 4500 rpm and took me from 14.50 to 13.8 et.
But 350" with ported iron heads.

I like to swap cams and see what they do but most people do not.
My 4 door 57 that pulls my boat has 10.87 compression so it runs well with just about any cam I stick into it.

I quit playing with 8.5 compression when I was around 21.
I do want to revisit it but use a turbo in the process.
But even that low compression Turbo trend is not what some of my quick buddies are doing.
10.3 compression and 27 PSI on top of that and running into the 4's in the 1/8 mile!

Friend had stock heads 76cc on his 355" with thick head gasket and non decked block .. ran the 292H with stock springs. valve float at 5600 so he shifted at 5500. It was a turd that sounded awesome.

I raced him and smoked him by 5 bus lengths.
I told him I was shifting at 6900rpm and ran the 270H which was 224 @ .050 on a 110 LSA.
I told him he needs a much smaller cam and he said he did not want to rev it too much past 5500.

I seen him the next month and he installed the 268H which was [email protected] .050.
He said it is the fastest engine he had ever built and it had the smallest cam he ever used.
Low compression and NON ported iron heads

Yep!
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post #21 of 35 (permalink) Old Oct 21st, 19, 7:13 AM
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Re: Cam for stock ‘71 402

Quote:
Originally Posted by Vintage Musclecar View Post
From mildest to wildest:

https://www.summitracing.com/parts/c...make/chevrolet

https://www.summitracing.com/parts/c...make/chevrolet

https://www.summitracing.com/parts/c...make/chevrolet

With a heavy tank, no compression and no gears, forget about anything over 5000 rpm, you need everything downstairs you can get.

Yes, Crane 969391 stock replacement cam for the L34 402 motor. If anything, you can go similar and tighten the LCA to 112.

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post #22 of 35 (permalink) Old Oct 21st, 19, 10:54 AM
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Re: Cam for stock ‘71 402

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Originally Posted by 70L34 View Post
Thanks Eric, I’m liking the one in the middle.
With 402" and no compression and a cruise rpm of ~2K, you don't really want--or need a split pattern cam, a single pattern will make better low end power.

Personally I would use the 10303 cam and install a decent 2 1/4" or 2 1/2"dual exhaust (retaining the manifolds), close the hood and cruise the wheels off of it.

Oh yeah, keep the QJet.

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post #23 of 35 (permalink) Old Oct 21st, 19, 12:00 PM
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Re: Cam for stock ‘71 402

Isky MEGA_Hydraulic 264. Cam And Complete Kit [390264] - $650.00 : ISKY Racing Cams, Do It Right

PS. The "MEGA" series are typically tight LSA, while the CompuCam series are typically wider LSA. The wide will give a smoother idle and a bit more top end pull with a broad flat TQ curve. The tight (108) gives a slight chop at idle and a mid range hump in the TQ curve, sacrificing some top end. I personally would use the MEGA series.
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post #24 of 35 (permalink) Old Oct 21st, 19, 9:38 PM
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Re: Cam for stock ‘71 402

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Originally Posted by 427L88 View Post
This was my choice as well.
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1971 Chevelle
496
CFM Ported Stage 5 Brodix Race-Rites 310cc
10.5 scr
Ultradyne Solid Roller 256/264 .660/.660 108 lsa
CFM Ported Victor Jr / Pro Systems Venom VX 1050
T-56 Magnum 6 Speed, DFX
12 Bolt TrueTrac, 4.56 gear 33 spline Moser axles
30x12.5 ET Street Radial
525++ rwhp
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post #25 of 35 (permalink) Old Oct 22nd, 19, 1:08 AM
 
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I just stumbled across the cam card from a rebuild I did many years ago. Same situation, stock ‘72 402 with measured compression barely over 8:1, stock converter, gears, etc.

At that time Harold Brookshire recommended the following two cams.

https://www.lunatipower.com/high-eff...k-262-272.html

https://www.lunatipower.com/high-eff...k-266-270.html

I went with the smaller of the of the two. Not much to say, it’s a very mild streetable cam that fit the combo and was a healthy bump over the stock 193/204 and .398/.430 lift cam.
My opinion is, unless you bump up the compression and do other supporting mods, stick in this cam size range for a street cruiser and be happy you gained power over stock with no real trade off.
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post #26 of 35 (permalink) Old Oct 22nd, 19, 12:42 PM
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Re: Cam for stock ‘71 402

put a weiand st blower on it along with a small cam that will get it moving
friend used a 264 Isky 144 blower on a 70 convertible with 3.08 stock converter it was nuts how hard/long that car pulled even in high gear.
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post #27 of 35 (permalink) Old Oct 22nd, 19, 12:44 PM
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Re: Cam for stock ‘71 402

The .515 lift,[email protected] 110 LSA Crane works great in a low compression,bone stock 454 and I would imagine it would do the same in a 396/402
JMHO and experience with that cam.
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post #28 of 35 (permalink) Old Oct 23rd, 19, 3:48 PM Thread Starter
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Hey folks! I ended up buying the Isky 264 Mega cam which is just a bit more aggressive than the cam Chris recommended. Wish me luck...I’ll report back when I get it into the car.

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post #29 of 35 (permalink) Old Oct 23rd, 19, 5:36 PM
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Re: Cam for stock ‘71 402

Quote:
Originally Posted by 70L34 View Post
Hey folks! I ended up buying the Isky 264 Mega cam which is just a bit more aggressive than the cam Chris recommended. Wish me luck...I’ll report back when I get it into the car.
Good choice!

Darren
1971 Chevelle
496
CFM Ported Stage 5 Brodix Race-Rites 310cc
10.5 scr
Ultradyne Solid Roller 256/264 .660/.660 108 lsa
CFM Ported Victor Jr / Pro Systems Venom VX 1050
T-56 Magnum 6 Speed, DFX
12 Bolt TrueTrac, 4.56 gear 33 spline Moser axles
30x12.5 ET Street Radial
525++ rwhp
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post #30 of 35 (permalink) Old Nov 1st, 19, 2:49 PM
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Anxious to hear your impressions of this cam in this combo. Seems like a great fit!
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