Dart SHP 180 Heads To Small? - Chevelle Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 8 (permalink) Old Jul 12th, 20, 1:05 PM Thread Starter
Tech Team
mark
 
Join Date: Mar 2009
Location: Mesa, AZ
Posts: 808
Dart SHP 180 Heads To Small?

Cleaning up the garage and gathered all the parts I have to build a nice 385sbc.

I have a 4 bolt 010 short block with Eagle crank and rods. Forged .040 flat tops with two valve reliefs.

The cam is an Isky hydraulic roller #210282294 .050 duration is 234/246 lift will be .565/.587 with my 1.6 Crower rockers. Lobe Center is 110.

Intake is an RPM air gap, with a HP750dp carb. Headers are Hooker Super Comp 1.750

The 180SHP heads I have are un-ported 64cc with 2.02/1.60 valves. Bigger spring with 185 seat and 395 open. Are these heads to small for the rest of the engine combo?

The car is a 69 Camaro, TH350 with a kit and 2,500 Hughes converter, 4:10 posi.

What do you guys think? The heads worked great on my 355, but with the extra 30 cubes, i think there on the small side. I have them, and there all freshened up and ready to bolt on.

1969 Chevelle
412 small block
M-20 4spd
4:10 12 bolt
Sold, went to Sweden

1957 Thundarbird Gasser
Aluminum Shafiroff 582
Richmond 6spd
4:33 59 Olds rear
Dads old race car
He bought it in 1967

1967 Camaro
355 small block
M21 4spd
4:88 12 bolt spool
40yr old drag car
barn find in south PHX AZ
marks412 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old Jul 12th, 20, 4:37 PM
Team Member
George
 
Join Date: Feb 2010
Location: Upper Sandusky, Ohio
Posts: 2,909
Re: Dart SHP 180 Heads To Small?

I have a set of similar sized Edelbrock Performer RPM heads. Ran them on a 355 and 388. They were all done by 6200 on both engines. One had a 221/235/510 lift hyd roller Rpm intake other had a 252/258 638 solid roller vic jr intake.

355 ran 12.80’[email protected]
388 ran 11.80’[email protected]

Same gearing, 1-5/8 headers etc.

Buddy has a similar 383 with afr210’s and smaller solid roller running 11.40’[email protected] I think.

I think 180 is too small but if just a cruiser not trying to get every last hp they would be fine. If you have them might as well run em.

'71 Malibu
3580 #, 6.0 LQ4, Summit pistons, Summit 8702 cam, vic jr, AED 750hp, msd 6014, 11.5:1 compression, NOS Cheater plate
T-350, PTC 9" converter, 12 bolt, spool, 3.90 gears, MT ET R 275/60/15

355 [email protected]
125 [email protected]
388 Mud Motor- [email protected]
100 shot [email protected]
'72 Greenbrier Wagon: 454, 700R4, 12 bolt with 3.73
Geo71 is offline  
post #3 of 8 (permalink) Old Jul 12th, 20, 7:58 PM
Senior Tech Team
jeff
 
Join Date: Jan 2008
Location: yukon ok.
Posts: 5,245
Re: Dart SHP 180 Heads To Small?

I keep wondering what it is with aftermarket heads NON ported that people are having issues with getting RPM from them.

They then assume the runner volume is the culprit as to why it is RPM limited.

I run ported l GM cast iron heads and even the mild ported ones that do not seem to flow well on the intake side they still RPM to 7000 and then some with mild cams [email protected] .050. or [email protected] .050.

I did stick large valves into a small chamber 601 casting come with 1.84-1.50 and I went 1.94 intake valve and the cam was 292H [email protected] .050.

The engine was done right before 7000 rpm.
That was not right as I have ran the small 1.84 valve to 7000+ and it pulled harder with the 280H cam.

Off came the heads after 2 days of tweaking the tune to no avail.

The 1.94 valve was too large and I was getting a washed out spot in the chamber near the spark plug right across from the intake valve.

I unshrouded the chambers and only in that spot.
The engine now pulled hard past 7500 and we just set shift point at 7400 for safety sake.
115 MPH. It did hit 117 once.

I ran some Edelbrock 5089 heads on an FS600 flow bench and at .500" lift they got noisy and the flow was not clean.
I ported them and things smoothed out.

Those heads are on a 355" with a 280H cam ground on a 106LSA.
[email protected] .050 and .480" lift best shift point was 7000 RPM.

I slightly opened and smoothed the push rod pinch also.
I open that up quite a bit on all my iron GM heads.

Could it be the cross section is the limiting factor or could it be the unported bowls or the chamber shape holding out of the box heads back???

I will never know as I can't stick heads on without porting them.

I ran the 280H cam on a 110 LSA in a 385" ported 601 heads 1.84-1.50 valves and not any good porting either.
Intake runner was left stock size and I did not raise the exhaust runner either.
Flow was way less than an RPM head 220cfm intake and in the 150 on the exhaust.
Lapped stock valves no fanyc 3 angle valve job either.
It still pulled to 7000 rpm really quick.
11.9 compression on that one. Runners are under 170CC


If you ask me the 180cc runner is fine. Is the rest of the head up to the task at hand.
jeff swisher is offline  
 
post #4 of 8 (permalink) Old Jul 12th, 20, 10:15 PM
Lifetime Premium Member
Jim
 
Join Date: Nov 1999
Location: International Falls MN
Posts: 6,644
Re: Dart SHP 180 Heads To Small?

Jeff you ever measure the PR pinch on your 305 heads after porting?

Jim

77 Monte
421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. from Jake 200-4r w/ 3.73's
Machine work by Torvinen's machine
11.93 @ 112.7 & tuning
67 Imp.SS for the wife 275 hp 327-TH350
77 cruiser is offline  
post #5 of 8 (permalink) Old Jul 12th, 20, 10:31 PM
Senior Tech Team
 
Join Date: Feb 2019
Posts: 1,155
Re: Dart SHP 180 Heads To Small?

Quote:
Originally Posted by marks412 View Post
Cleaning up the garage and gathered all the parts I have to build a nice 385sbc.

I have a 4 bolt 010 short block with Eagle crank and rods. Forged .040 flat tops with two valve reliefs.

The cam is an Isky hydraulic roller #210282294 .050 duration is 234/246 lift will be .565/.587 with my 1.6 Crower rockers. Lobe Center is 110.

Intake is an RPM air gap, with a HP750dp carb. Headers are Hooker Super Comp 1.750

The 180SHP heads I have are un-ported 64cc with 2.02/1.60 valves. Bigger spring with 185 seat and 395 open. Are these heads to small for the rest of the engine combo?

The car is a 69 Camaro, TH350 with a kit and 2,500 Hughes converter, 4:10 posi.

What do you guys think? The heads worked great on my 355, but with the extra 30 cubes, i think there on the small side. I have them, and there all freshened up and ready to bolt on.
It should run great. I ran Brodix 180 cc head in the late 90's on my 406 and the car ran 10.80's with them. Bigger heads may make more HP but smaller heads will make more torque. Right now I have a flat top 406 with unported 906 Vortec heads that runs in the mid 11's. Your Dart heads on that 385 should go very good.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
68Chevele is offline  
post #6 of 8 (permalink) Old Jul 13th, 20, 1:03 AM
Tech Team
 
Join Date: Aug 2005
Location: KY
Posts: 968
Re: Dart SHP 180 Heads To Small?

Quote:
Originally Posted by 68Chevele View Post
It should run great. I ran Brodix 180 cc head in the late 90's on my 406 and the car ran 10.80's with them. Bigger heads may make more HP but smaller heads will make more torque. Right now I have a flat top 406 with unported 906 Vortec heads that runs in the mid 11's. Your Dart heads on that 385 should go very good.

I agree. Your cam should peak power around 6200 rpm. Your engine will need 235-240 cfm for 100% VE at that rpm. Your heads should flow that without any problem. The smaller head will be worth a little torque at lower rpms over a larger head. Use them.
sleeper is offline  
post #7 of 8 (permalink) Old Jul 13th, 20, 8:52 AM
Senior Tech Team
 
Join Date: Feb 2005
Location: Long Island, N.Y.
Posts: 2,444
Re: Dart SHP 180 Heads To Small?

Quote:
Originally Posted by marks412 View Post
Cleaning up the garage and gathered all the parts I have to build a nice 385sbc.

I have a 4 bolt 010 short block with Eagle crank and rods. Forged .040 flat tops with two valve reliefs.

The cam is an Isky hydraulic roller #210282294 .050 duration is 234/246 lift will be .565/.587 with my 1.6 Crower rockers. Lobe Center is 110.

Intake is an RPM air gap, with a HP750dp carb. Headers are Hooker Super Comp 1.750

The 180SHP heads I have are un-ported 64cc with 2.02/1.60 valves. Bigger spring with 185 seat and 395 open. Are these heads to small for the rest of the engine combo?

The car is a 69 Camaro, TH350 with a kit and 2,500 Hughes converter, 4:10 posi.

What do you guys think? The heads worked great on my 355, but with the extra 30 cubes, i think there on the small side. I have them, and there all freshened up and ready to bolt on.
Those heads will be fine on a 4.000" bore "streeter", been there, done it?

Thanks, Gary in N.Y.

P.S. Two recent builds come to mind, both with some "180" heads, first one made 460 HP @ 5800, second, 475 Hp @ 6100. Both had the same cam, 234*/242* x .540"/.560" x 107* ICL (Blue-Racer #WG5103HR).

Sept. 2019 Drag-Week Winner - N.Y. Legal Streeter - 1956 Chevy Bel-Air 7.23 @ 196+ @ 3800#
Best time to date-11/2019 7.00 @ 204+ @ 3800#
GOSFAST is online now  
post #8 of 8 (permalink) Old Jul 13th, 20, 8:39 PM Thread Starter
Tech Team
mark
 
Join Date: Mar 2009
Location: Mesa, AZ
Posts: 808
Re: Dart SHP 180 Heads To Small?

Thanks for all the input. I was thinking a 200-210 intake runner would be a better fit with this cam.

1969 Chevelle
412 small block
M-20 4spd
4:10 12 bolt
Sold, went to Sweden

1957 Thundarbird Gasser
Aluminum Shafiroff 582
Richmond 6spd
4:33 59 Olds rear
Dads old race car
He bought it in 1967

1967 Camaro
355 small block
M21 4spd
4:88 12 bolt spool
40yr old drag car
barn find in south PHX AZ
marks412 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome