Cannot Establish a Secure Connection

The Internet Browser you are using cannot establish a secure connection to SummitRacing.com or JavaScript is disabled which will prevent you from being able to Log In or Checkout. If JavaScript is enabled the problem is likely due to SSL 3.0 being your default SSL setting. This makes you vulnerable to the "POODLE exploit" and to ensure your security, it is not allowed on our site. Please change your browser security settings to not allow SSL 3.0 and check to make sure that JavaScript is enabled. You can also update your browser using these links.

In-Store Pickup Location Close

Summit Racing® Cast Iron Cylinder Heads for Small Chevy SUM-152123

Get Free Shipping with Your Order over $99!

Cylinder Head, Cast Iron, Assembled, 72cc Chamber, 165cc Intake Runner, Chevy, 302, 327, 350, 400, Each

Estimated Ship Date: Today Would you rather pick it up? Select Location

  • Order this item and get free delivery and handling on your entire order! Oversize fees also waived on this item. Valid on orders shipped in the contiguous United States.

Brand: Summit Racing

Manufacturer's Part Number: SUM-152123

Part Type: Cylinder Heads

Product Line: Summit Racing® Cast Iron Cylinder Heads for Small Chevy

Summit Racing Part Number: SUM-152123

Cylinder Head Style: Assembled

Cylinder Head Material: Cast iron

Cylinder Head Finish: Natural

Combustion Chamber Volume (cc): 72

CNC-Machined Combustion Chamber: No

Intake Runner Volume (cc): 165cc

CNC-Machined Intake Runner: No

CNC-Machined Exhaust Runner: No

Intake Port Location: Standard

Exhaust Port Shape: Square

Exhaust Port Location: Standard

Spark Plug Style: Straight

Intake Valves Included: Yes

Intake Valve Diameter (in): 2.020 in.

Exhaust Valves Included: Yes

Exhaust Valve Diameter (in): 1.600 in.

Valve Springs Included: Yes

Maximum Valve Lift (in): 0.520 in.

Outside Diameter of Outer Spring (in): 1.250 in.

Damper Spring Included: Yes

Number of Springs Per Valve: Single

Retainers Included: Yes

Retainer Material: Steel

Locks Included: Yes

Lock Style: 7 degree

Valve Stem Seals Included: Yes

Valve Stem Seal Style: Umbrella

Rocker Arm Studs Included: Yes

Rocker Arm Nut Thread Size: 3/8-24 in.

Rocker Arms Included: No

Rocker Arm Nuts Included: No

Guideplates Included: No

Valve Cover Mounting Style: Center and perimeter bolt

Accessory Bolt Holes Drilled: Yes

Valve Guides Included: Yes

Valve Guide Material: Cast iron

Valve Seats Machined: Yes

Valve Seat Machine Style: 3-angle

Valve Seat Material: Ductile iron

Steam Holes Drilled: No

Oiling Style: Through pushrod

Machined for O-Ring: No

Heat Crossover: Yes

Quantity: Sold individually.

Notes: Will accommodate center bolt valve covers with minor modifications. Features ductile iron seats on exhaust ports only for use with unleaded gas. Machine work must be done to accommodate guideplates.

In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.

Calculator Compression Calculator

Think you have to scour the local bone yards to find a decent set of GM's old double hump or fuelie cylinder head castings? Not true. In fact, we've brought back classic Chevy performance in a big way with these ready-to-run heads for small block Chevy. Our versions of the popular GM cylinder heads offer great performance for less than it would cost to rebuild an old set of double hump castings.

Warranty

Most Helpful Reviews Review this Product

12 Customer Reviews for Summit Racing SUM-152123 - Summit Racing® Cast Iron Cylinder Heads for Small Chevy

Average Customer Review

5 Star

(11)

4 Star

(1)

3 Star

(0)

2 Star

(0)

1 Star

(0)
+See All 12 Reviews

good value for the price

Summit RacingSummit Racing Verified Purchase

heads worked really well in my boat application. machinist was impressed with the quality of the heads- (this guy builds sprint car engines). was cheaper buying new than reconditioning old heads. all the external accessories bolted up without issue

1 of 1 found this review helpful.

report abuse

Report Abuse Close

If you feel that this review is inappropriate and should be removed from the site, report it to us by clicking the "Report Abuse" button below.

Cancel

Reviewer: GEORGE from WA

Date: May 01, 2014

Appearance
Ease of Installation
Price/Value
Quality

Great value

Summit RacingSummit Racing Verified Purchase

These are super!! I have them on a 406 sb chevy and love the performance!

1 of 1 found this review helpful.

report abuse

Report Abuse Close

If you feel that this review is inappropriate and should be removed from the site, report it to us by clicking the "Report Abuse" button below.

Cancel

Reviewer: BERNARD from NM

Date: March 08, 2014

Appearance
Ease of Installation
Price/Value
Quality

Summit Racing Iron Cylinder Heads SBC

Summit RacingSummit Racing Verified Purchase

Just installed these heads on my SBC 350. I can really feel the difference. I recommend painting them before install.

0 of 0 found this review helpful.

report abuse

Report Abuse Close

If you feel that this review is inappropriate and should be removed from the site, report it to us by clicking the "Report Abuse" button below.

Cancel

Reviewer: ROBERT from CA

Date: January 13, 2015

affordable

Summit RacingSummit Racing Verified Purchase

Looked and looked for a decent pair of aftermarket street heads that didn't cost much but were of good quality and performance. By performance I'm comparing to stock factory heads. It would've cost me more to repair my old 441's. Nice looking machine work. I did notice the ports will need gasket matched at the least. For a mild street motor for my son's first truck these will be perfect. ...read more

0 of 0 found this review helpful.

report abuse

Report Abuse Close

If you feel that this review is inappropriate and should be removed from the site, report it to us by clicking the "Report Abuse" button below.

Cancel

Reviewer: CHAD from KS

Date: January 01, 2015

Appearance
Ease of Installation
Price/Value
Quality

great Deal for the money

Summit RacingSummit Racing Verified Purchase

I have had these heads on two different small blocks and they have always performed satisfactory...Got them on a Gen.1 350 now and runs like a champ...

0 of 0 found this review helpful.

report abuse

Report Abuse Close

If you feel that this review is inappropriate and should be removed from the site, report it to us by clicking the "Report Abuse" button below.

Cancel

Reviewer: RICHARD from MO

Date: December 14, 2014

Appearance
Ease of Installation
Price/Value
Quality

Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

Back To Results
Email this page Close
Close