180, 200+cc heads???

General engine tech -- Drag Racing to Circle Track

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88bluestar
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180, 200+cc heads???

Post by 88bluestar » Sun Oct 29, 2017 11:54 am

I hear many different opinions on this and trying to see what makes the most sense with respect to cost and power. What makes the best power for a dirt track engine, cast iron heads only with 23 degree angle.

180cc runner or larger, valve size, etc?

7000 rpm max 3/8" dirt oval
3000 lbs car with 8.5-9" tread
10.0:1 compression/360 max cid
830 cfm carb Holley 4 bbl
2716 edelbrock intake with 1" open spacer. 2701 can also be used if not vortec related
stock block small block chevy
std weight forged crank, 3.50 stroke
380-400 gm piston weight
low tension metric rings
Jones race cam

mark_follweiler
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Re: 180, 200+cc heads???

Post by mark_follweiler » Sun Oct 29, 2017 12:07 pm

is the 7000 mandated or something you picked? what about the cam?

88bluestar
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Re: 180, 200+cc heads???

Post by 88bluestar » Sun Oct 29, 2017 2:01 pm

Yes, 7000 is the rev limit per rule.

244-248 @.050, .352/.359 cam lift, 1.6 on intake. 108 LSA

GARY C
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Re: 180, 200+cc heads???

Post by GARY C » Sun Oct 29, 2017 3:05 pm

If it has to be as cast the heads are usually smaller than the advertised #, for instance the RHS head pours around 195cc.
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Re: 180, 200+cc heads???

Post by mark_follweiler » Sun Oct 29, 2017 3:11 pm

as cast? porting allowed?

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Re: 180, 200+cc heads???

Post by sanfordandson » Sun Oct 29, 2017 7:57 pm

The 830 carb is way to big.

I'd go bigger on the cam as well. 244/248 is good for a 2bbl but small for a 4bbl. 250/250 would be my choice.

I'd do a 180 runner. Anything bigger can be lazy on the bottom end. You'll want bottom end on a 3k lbs car.

88bluestar
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Re: 180, 200+cc heads???

Post by 88bluestar » Mon Oct 30, 2017 1:34 pm

Porting is allowed

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Re: 180, 200+cc heads???

Post by GARY C » Mon Oct 30, 2017 1:37 pm

Then I would start with the 180 and a good head porter to utilize the best port for the rpm band you will be operating in.
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Re: 180, 200+cc heads???

Post by lefty o » Mon Oct 30, 2017 1:39 pm

id go back in time with the heads. a well ported set of sportsman II's, and add another 10degr to both sides of the cam.

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Re: 180, 200+cc heads???

Post by mark_follweiler » Mon Oct 30, 2017 1:46 pm

GARY C wrote:
Mon Oct 30, 2017 1:37 pm
Then I would start with the 180 and a good head porter to utilize the best port for the rpm band you will be operating in.
this would be the way to go.

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Re: 180, 200+cc heads???

Post by Carnut1 » Mon Oct 30, 2017 3:01 pm

I am guessing 355 ci? Ported 180cc heads will deliver if done right they will finish about 205cc.
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Re: 180, 200+cc heads???

Post by 88bluestar » Mon Oct 30, 2017 3:20 pm

valve size? any advantage to a larger valve

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Re: 180, 200+cc heads???

Post by Carnut1 » Mon Oct 30, 2017 3:36 pm

If you are running a 4.03" bore I would not go larger than 2.055" intake.
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Re: 180, 200+cc heads???

Post by user-29956 » Mon Oct 30, 2017 4:58 pm

52.8mm valve on that bore size should be considered maximal!!!!!!

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Re: 180, 200+cc heads???

Post by dirtracr5 » Mon Oct 30, 2017 7:33 pm

Im my experience the 180 head would be perfect. We build a spec 360 10.5 to 1 engine on gas with a 4bbl and make about 450hp 460tq. We turn 7400 rpm in a 3000lb stockcar. We use a spec eq head thats only around a 170cc runner. I have tried a 200 runner head and they are very lazy on the bottom end and come on like a bottle rocket about 1/2 way down the straightaway.

I agree the 830cfm carb is WAY to big.

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