New ATK 210 solid flat 383 combo - Opinions? - Chevelle Tech
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post #1 of 19 (permalink) Unread Jun 12th, 19, 1:41 PM Thread Starter
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Shane
 
Join Date: Aug 2011
Location: Montana
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New ATK 210 solid flat 383 combo - Opinions?

This is going into a 3300lb vehicle .



Zero deck Gm block 4.030
-7cc wiesco, scat 6” , 3.750 crank 10.8:1
ATK 210cc heads w/valve job matched to 1206 , 135lb 1.800 seat 380 open 1.200
300-25 Holley matched to 1206
Standard 750 dp , no choke horn
Bullet solid flat tappet 1.6 rocker
Intake 283 [email protected] [email protected] .573
Exhaust 287 [email protected] [email protected] .574
108 lsa on 104 Icl . Exhaust 112 cl
Th350 , 3800 xhd 10” stall 3.73 gear
Full msd ignition 6al etc..
1 3/4 header 3” exhaust

Was also thinking 248 252 nf lobes from Harold but might to aggressive of a lobe for street ? Also not enough spring ?

Thanks for the opinions !!!!!
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post #2 of 19 (permalink) Unread Jun 12th, 19, 6:35 PM
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I have this in 3500# Chevy. M-21 and 4:11. Perfect street engine for me, similar to what you’re looking at ?

https://www.ebay.com/itm/CHEVY-TURN-...-/332327968139
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post #3 of 19 (permalink) Unread Jun 12th, 19, 7:29 PM
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Jim
 
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Re: New ATK 210 solid flat 383 combo - Opinions?

I might put 1.5 rockers on the ex. should be strong though.

Jim

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post #4 of 19 (permalink) Unread Jun 12th, 19, 8:44 PM
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What’s HP & $ for ATK ?
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post #5 of 19 (permalink) Unread Jun 12th, 19, 9:15 PM Thread Starter
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Shane
 
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Paid 1078 for heads . Currently with machinist to check them out and valve job . Flow numbers seem as good or better than afr 195 ‘s except the exhaust is a little behind .
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post #6 of 19 (permalink) Unread Jun 12th, 19, 9:43 PM
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Gene
 
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Re: New ATK 210 solid flat 383 combo - Opinions?

160 @ .200" is where some real snot starts being made, It should RIP! RATKILLER!

Gene
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post #7 of 19 (permalink) Unread Jun 12th, 19, 10:03 PM
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Ole
 
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Re: New ATK 210 solid flat 383 combo - Opinions?

I like it, but then I'm a sucker for any Chevy V8 with compression and solid lifters.

And I haven't been to Missoula since I and my daughter drove there in my '65 SS for a car show back in '98. Hope it's still a decent town.
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post #8 of 19 (permalink) Unread Jun 12th, 19, 11:25 PM Thread Starter
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Shane
 
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Quote:
Originally Posted by Saltherring View Post
I like it, but then I'm a sucker for any Chevy V8 with compression and solid lifters.

And I haven't been to Missoula since I and my daughter drove there in my '65 SS for a car show back in '98. Hope it's still a decent town.
Property values keep rising . . I live in Billings now . Love Montana .
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post #9 of 19 (permalink) Unread Jun 13th, 19, 7:06 AM
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Mr Bill
 
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Re: New ATK 210 solid flat 383 combo - Opinions?

You can call Bullet to make sure but 380 lbs open pressure on a flat tappet cam is just asking for a wiped lobe in my opinion. If the cam specs you show are for a 1.5 rocker you will be over .600 lift with the 1.6 rockers and even more spring pressure.

If you insist on using them you absolutely will have to take the inner springs out for break in.

That's my 2 cents
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post #10 of 19 (permalink) Unread Jun 13th, 19, 7:45 AM
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jeff
 
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Re: New ATK 210 solid flat 383 combo - Opinions?

I think that lift is with 1.6 rockers looking at bullet cam stuff.
I also feel the open is a bit much.
I have ran [email protected] .050 with 1.6 rockers and with that it had .571" lift and lashed at .026"
My open pressures were 345 and I used a Howards direct lube lifters and Joe Gibbs Break in oil and their Hot rod oil after 2 breakin's.

That cam lasted a few years and is still good but the vehicle was crashed.

I cringe when i get to the 340 psi open area and lately found I did not really need that much open pressure.
The high seat pressures are nice though.
Last 2 cams in my own vehicles got some really light stuff. I went Ovate Beehive springs with tiny retainers.

270 spring rate on an old 280H magnum flat tappet with 110 seat and it will rev to 7500 and then I get valve float.
Another is a Roller with [email protected] .050 and .492" lift. 313 spring rate with 130 seat pressure.

It will rev 7200 rpm lickity split.
Yea I know not as much lift but i proved to myself I did not need all that open pressure.

A solid flat tappet 252 @ .050 duration .536" lift with 1.5 rockers will be taking place of the Roller soon and keeping the same 130 seat and 313 rate springs.
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post #11 of 19 (permalink) Unread Jun 13th, 19, 11:09 AM
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Gene
 
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Re: New ATK 210 solid flat 383 combo - Opinions?

Bill is correct,. I had to break in my UDH SFT TWICE! Both times I removed the inners. Also use oil hole lifters, and anal on hi wear oil. Cam looks mint after 25K ( bottom end redone 10K ago. ) Isky 8005a springs. 135/370 or so. Steel Crower Enduros for long street use btw, imho, & Ti retainers. She saw likely 8000rpms this winter when the clutch literally hung up on a 1/2 shift. Damn 23 degrees!

Gene
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post #12 of 19 (permalink) Unread Jun 13th, 19, 2:13 PM Thread Starter
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Shane
 
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Quote:
Originally Posted by BillK View Post
You can call Bullet to make sure but 380 lbs open pressure on a flat tappet cam is just asking for a wiped lobe in my opinion. If the cam specs you show are for a 1.5 rocker you will be over .600 lift with the 1.6 rockers and even more spring pressure.

If you insist on using them you absolutely will have to take the inner springs out for break in.

That's my 2 cents <img src="https://www.chevelles.com/forums/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />
Lift stated is with 1.6. I will definitely take the inners out ! &#x1f642; &#x1f44d; I honestly thought my spring was a little light to control above 6000.. I was warned my springs were too light for the nf lobes , which I believe are a 28 major. 252-256 cam is not as aggressive and closes exhaust slower/easier .

Thank you for the input . I’m hoping she runs clean to 7 and pulls all the way ! 525-550hp ? Lol Customer should be thrilled . We did this over a blueprint crate that was almost ordered . Talked him into seeing the light &#x1f3c1;&#x1f3c1;. What’s another couple grand &#x1f602;. Actually this has come together quite economically . Under 6 with needing new shortblock , carb , intake , ignition , oil setup , converter etc... pretty proud of myself &#x263a;&#xfe0f;&#x1f602;. Fun factor will be worth it .

I will post videos when done. Parts are arriving by the day . Cam is ordered . Cnc lobes will take week or so .
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post #13 of 19 (permalink) Unread Jun 13th, 19, 2:17 PM Thread Starter
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Shane
 
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Quote:
Originally Posted by 427L88 View Post
Bill is correct,. I had to break in my UDH SFT TWICE! Both times I removed the inners. Also use oil hole lifters, and anal on hi wear oil. Cam looks mint after 25K ( bottom end redone 10K ago. ) Isky 8005a springs. 135/370 or so. Steel Crower Enduros for long street use btw, imho, & Ti retainers. She saw likely 8000rpms this winter when the clutch literally hung up on a 1/2 shift. Damn 23 degrees!
Na small blocks I run 10-30 vr1 . Has not failed me yet &#x1f44d;. I quit using 20-50 when I got on the morel lifter train . Reserved for race cars and power adder. Man I bet we could debate oil and weights for the next couple years !!! &#x1f602;

P.s. I have a couple bbc udharold sft’s out there still living. !! Lash barely moves . Always edm lifters !
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post #14 of 19 (permalink) Unread Jun 14th, 19, 9:23 AM
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Gene
 
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Re: New ATK 210 solid flat 383 combo - Opinions?

The TC gang gave us a heads up on cases of VR-1 at $18 a pop a few months ago, so I stocked up! Been running PennGrade 15-40 on Harold's BBC cam. ( "tiny" 276/284 F10 )

Fwiw, the Isky 8005a with Ti retainers held very stable at well over 7000 rpm ( by accident!) 1.7:1 ratio splayed valve BBC. So, I should think you'd be fine.

Gene
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post #15 of 19 (permalink) Unread Jun 14th, 19, 11:20 AM
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Rick
 
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Re: New ATK 210 solid flat 383 combo - Opinions?

Why not go with a HYD roller or even a baby solid roller cam? With a roller cam you could really get more out of that combo.
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