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Well, after a long hiatus, I purchased a 1972 Chevelle SS with a numbers matching 402 and TH400. Looking to get a bit more performance out of the car, but still keeping all of the original parts that come off of the car. So far I have added an Edelbrock Performer intake, SMI Quadrajet and an MSD Ready-To-Run Distributor. I will be adding 3.31 rear gears to upgrade from the factory 2.73s.



Previous owners have added a set of 215 heads (stock valves) that should bump the compression up to around 9.2-9.5:1 somewhere in that range. Now, comes the fun part... Adding a nice cam to finish up the combo since I am unsure of the cam that is in there now, but it is small. I have a few in mind and am not opposed to upgrading the torque converter as well to a 2000-2500 stall. This is for a street performance car, may take it to the track, but a fun driver overall



Here are a few of the cams I am looking at:


Lunati:
30110512 Solid Flat Tappet

Advertised Duration (Int/Exh): 272/282; Duration @ .050 (Int/Exh): 238/248; Gross Valve Lift (Int/Exh): .550/.570; LSA/ICL: 112/106; Valve Lash (Int/Exh): .020/.022; RPM Range: 2400-6800


10110702 (60202) Hydraulic Flat Tappet

Advertised Duration (Int/Exh): 262/268; Duration @ .050 (Int/Exh): 219/227; Gross Valve Lift (Int/Exh): .530/.542; LSA/ICL: 112/108; Valve Lash (Int/Exh): Hyd/Hyd; RPM Range: 1400-5800


10110703 (60203) Hydraulic Flat Tappet
Advertised Duration (Int/Exh): 268/276; Duration @ .050 (Int/Exh): 227/233; Gross Valve Lift (Int/Exh): .542/.554; LSA/ICL: 110/106; Valve Lash (Int/Exh): Hyd/Hyd; RPM Range: 1800-6200


Comp Cams:
XS268S Solid Flat Tappet
Advertised Duration (Int/Exh): 268/274; Duration @ .050 (Int/Exh): 230/236; Gross Valve Lift (Int/Exh): .553/.568; LSA/ICL: 110/106; RPM Range: 1600-6000


Looking for a good 400-425 and hopefully a decent amount of torque somewhere in the 425-450 range.
 
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there are plenty of cam guys here sure one will be along to add their comments and advice.
 

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Out of the cams you listed the first Lunati would be best. There are several builds on the net, one being Super Chevy where they used a 402 with 820 heads with larger valves (not a benefit from what I have seen on a small bore big block) bowl and gasket port, 10:1 compression, 750HP carb, performer rpm intake. It made 418 hp at 6300, 411 from 56-6000, and 452 trq at 3400 rpm. It also liked 42 degrees timing, which I have seen more than one 396/402 want 40-42 degrees.

You could also look at a hyd roller from Straub, as he has one which would work great. Isky's RR265/275 would also be good.
 

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Out of the cams you listed the first Lunati would be best. There are several builds on the net, one being Super Chevy where they used a 402 with 820 heads with larger valves (not a benefit from what I have seen on a small bore big block) bowl and gasket port, 10:1 compression, 750HP carb, performer rpm intake. It made 418 hp at 6300, 411 from 56-6000, and 452 trq at 3400 rpm. It also liked 42 degrees timing, which I have seen more than one 396/402 want 40-42 degrees.

You could also look at a hyd roller from Straub, as he has one which would work great. Isky's RR265/275 would also be good.
My honest opinion would be the 60203 what difference from that first cam to it?
 

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My honest opinion would be the 60203 what difference from that first cam to it?
It doesn't have the extra exhaust duration which works the best with factory heads, 6 vs 10 int/exh split. Tight 102-106 ICL works better on 396/402 engines especially with under 10:1 compression, which you could advance the 60203 2 more degrees. The VooDoo usually need more spring pressure because of the lobes than that solid does, which increases the chance of a lifter failure.

Another solid to look at is the Crane 131101, Grumpy Jenkins mentions it for many 396/402 builds. 300/310, 238/[email protected]", .544"/.566", .022"/.022" lash 108 LSA 103 ICL. "Excellent low end and midrange torque and hp, fair idle, moderate performance usage, bracket racing with heavy car, auto trans with 2000+ converter, 32-3600 cruise rpm, 10.5-11.5 comp ratio advised, 26-6200 rpm powerband".

And for a hyd the Crane 130201 hyd flat tappet. 278/290, 222/[email protected]", .529"/.525", 108 LSA 103 ICL. "Good midrange torque and HP, fair idle, performance usage, mild bracket racing with heavy car, 9.5 to 10.75 comp ratio advised, 1800-5600 rpm powerband".
 

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Anthony, I'm all about the manufacturer anymore, why dont you call ISKY, right around the corner. Mega 270 or 280 would work mint.
 

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10110702 (60202) Hydraulic Flat Tappet

Advertised Duration (Int/Exh): 262/268; Duration @ .050 (Int/Exh): 219/227; Gross Valve Lift (Int/Exh): .530/.542; LSA/ICL: 112/108; Valve Lash (Int/Exh): Hyd/Hyd; RPM Range: 1400-5800
I have a Lunati hydraulic roller in the 355 in my 65 Impala, and it also is 219/227 @ .050. Great street cam - idles smooth, pulls to 6000.

The other cams on your list are WAY too big, unless you want to go to a high-stall torque converter, which ruins street manners IMHO.
 
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Discussion Starter #8
I have a Lunati hydraulic roller in the 355 in my 65 Impala, and it also is 219/227 @ .050. Great street cam - idles smooth, pulls to 6000.

The other cams on your list are WAY too big, unless you want to go to a high-stall torque converter, which ruins street manners IMHO.

While I will agree with most of what you say, remember that any of the solid cams listed will lose 8-10 degrees of duration because of valve lash so there is that. Also, these small big blocks need RPM to make power, but it is street driven most of the time. The Lunati solid grind is the old 402A2 cam best I can tell, which works wonders in these small big blocks, but the Comp grind is interesting because it will work with stock stalls which is interesting...


I will call Isky to see what they recommend as well, but this selection is mostly what I have pulled based on similar builds to what I have going on. Again, this is the numbers matching block, so I would prefer to not do too much work on the bottom end. Eventually this engine will get pulled for a 454 and bagged, but that won't be for a few years at least.
 

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3.31's are my favorite street gear for a BBC, and the stock valves in those heads will mate up good with regards to torque.
Since you want a fun street driver, why even consider a solid lifter cam?
I would normally suggest a Hyd Flat tappet, but with all the horror stories that I've read here, I would contact Straub for a Hyd Roller - IMO.

Good luck and keep us posted.
I will be in the same boat as you in about a year (3.31's with Muncie).
 

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3.31's are my favorite street gear for a BBC, and the stock valves in those heads will mate up good with regards to torque.
Since you want a fun street driver, why even consider a solid lifter cam?
I would normally suggest a Hyd Flat tappet, but with all the horror stories that I've read here, I would contact Straub for a Hyd Roller - IMO.

Good luck and keep us posted.
I will be in the same boat as you in about a year (3.31's with Muncie).
Oh yeah, I have read all about the "horror stories" but to be honest, I haven't had an issue with a flat tappet cam yet (knock on wood I don't) but I am also preferable to a solid. I had one in my last car which was a 383 stroker and that thing was fun! Not only that, but I only adjusted the valves once a year and it was fine with a good Polylock.

Anyway, I called Isky to get a recommendation from them and here is what they gave me for a custom grind:

Adv. - 276/276
@.050 - 244/244
Lift - .560/.560
LSA - 109
Lash - .016/.016
2000-6000 RPM

The guy I spoke with said he has run something like that in a few 396/402 stock head applications and said it ran really well, so there's another one on the list...
 

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Chris,
What are the cam specs?
That has a nice flat & broad torque curve - if possible I'd like to know the dyno numbers for what it's doing under the 3500 rpm mark.
When my 67 396 4-spd 3:31 car was still on the road, buzzing around town I was usually in the 2200 - 3200 rpm range. Of course out of the city limits was another story.
 

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Anthony,

2k to 6k rpm range is great for 3.31's.

When I was 19 (and stupid) I took my Chevelle up to 6k on a local country road -
with those 3.31's the power poles looked like a picket fence! My buddy yelled (over the glass packs) "How fast are we going?". "I don't know, we buried the speedo way back there!".
 
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well, they only go 110-120mph in the 1/4 mile!

Anthony that is a WICKED INTENSE Isky cam man. I mean 276 to 244.. very much like my old Ultradyne. It ran mint! PLUS, my thought was with the 215's, they dont RPM super super well, ( as compared to OC anyway) so a single pattern would be ok.

PS I put 30,000 miles on my old Ultradyne SFT, and now its going into a drag car for the next 30! :)
 

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Anyway, I called Isky to get a recommendation from them and here is what they gave me for a custom grind:

Adv. - 276/276
@.050 - 244/244
Lift - .560/.560
LSA - 109
Lash - .016/.016
2000-6000 RPM

The guy I spoke with said he has run something like that in a few 396/402 stock head applications and said it ran really well, so there's another one on the list...
This is close to the Isky Z-45 cam that MEJ1990 had in a stock rebuilt L-34. 70 Chevelle, 4-speed Muncie, and 3.31 rear axle. Very streetable around town and would lug down easy for parking lots. Sounded awesome too.


Racing Cam [396245] - $196.00 : ISKY Racing Cams, Do It Right


another option


https://www.summitracing.com/parts/isk-396266/make/chevrolet
 

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Discussion Starter #18
well, they only go 110-120mph in the 1/4 mile!

Anthony that is a WICKED INTENSE Isky cam man. I mean 276 to 244.. very much like my old Ultradyne. It ran mint! PLUS, my thought was with the 215's, they dont RPM super super well, ( as compared to OC anyway) so a single pattern would be ok.

PS I put 30,000 miles on my old Ultradyne SFT, and now its going into a drag car for the next 30! <img src="http://www.chevelles.com/forums/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />
That's what I said! I was like wow that much duration, but if you say so! How was your Ultradyne on power brakes, because the guy at Isky said it had enough vacuum for power brakes and cowl induction which this car has. But, overall I was really happy with the way the Isky rep was on the phone, cordial and responded to questions and had a great personality! The customer service aspect is what is selling me at this point!

By the way, Chris thank you so much for responding and will definitely be looking at your setup as well!
 

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Discussion Starter #20
Well I ended up going with the Isky solid flat tappet. Got everything I needed from them including polylocks and lifters with the edm holes. Should be a nice little setup and am excited to see the power increases from the new cam. The 3.31's so far have been a huge improvement!
 
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