Pontiac 48 heads cc. 120" bore and flat top pistons (no dome).

Pontiac 48 heads cc Engines so equipped were the ‘68 Ram Air II 400, 1969-70 Ram Air IV 400, 1971-72 455 H. And, adding an excerpt from the 1970 performance catalog. 12, 13, 16, 48, 62, and 670 heads all have 2. ) *Pontiac 455 compression area = 25. mm Stroke: in. 060" deep same Seems Pontiac followed tradition in the fact that auto's got a little less cr than stick. 48 heads are off of a Ram Air 400 and you may not be able to find those. The '69 #48 and '68 #16 heads had screw-in rocker studs, the ports on both heads were essentially the same. I. These heads are designed primarily for race use and offer even higher performance than any factory Pontiac heads. mm Cylinder Head Volume: cc in. 0 out of 5 stars Jan 14, 2008 · High Performance Pontiac Mag June 05, another fine article by Rocky Rotella on the 70's cylinder heads. R. Here are the top 3: - DCI/Allpontiac. " that was slated for use in the low-cost GTO "ET" (which was changed to the high-end "Judge"). 6 48: 69 ra3 400 Feb 2, 2011 · The 72cc small chamber D-port heads most popular in performance applications like the no. 11/1. We were armed with a 400-cfm laminar flow element (powered by six 1. The "46" heads were most likely installed to drop compression. Assuming you do have the correct "48" heads for your engine, there appears to be 2 different Dec 11, 2020 · The best explanation I have ever heard is that a certain number of 66 CC casting 48 heads went thru a abbreviated maching process of the chamber to get leave it at 66 CCs and not 72 , and these where to be used on the 350 HO option coming up in 69 that Pontiac had high hopes for sales wise. Pontiac did compression changes with the head cc's. Pontiac made closed chambered heads until 1967. was not produced, these high compression heads were re-allocated and used on the Ram Air III instead. With flat top pistons and tight quench you are looking at 9. com Click Here for Edelbrock Aluminum Head Installation Sheet PONTIAC HEAD CHART CASTING NUMBER YEAR FACTORY APPLICATION CHAMBER VOL# CC'S EXHAUST PORT NOTEWORTHY ATTRIBUTES 528511 1958 370 62 D-Port 1. Configure Item See The seller was stating that these were 48 heads with 66 cc chambers. 62's, 48's, etc are all 72 cc's and have 72 cc's in the chamber, pretty much the same port shape and flow potential. Aug 25, 2008 · All open chamber D-port, large valve Pontiac heads are essentially the same. 5 cc,16s 74 cc,12s 67 cc,13s 77 cc,62s 75cc,64s 90 cc. They can be upgraded to the larger valves, but this of course costs money. 11 x 1. The 350 were in the 66-67 cc range. 2-9. 5c head stamped 7, 2. 5 hp vacuum cleaner motors), two graduated vertical manometers to measure atmospheric pressure, an incline manometer to measure actual airflow, and a velocity probe. 120" bore and flat top pistons (no dome). Jan 24, 2014 · All open chamber D-port, large valve Pontiac heads are essentially the same. 66 valves, 92-94 cc chamber, on 1975 350" CI. Condition: New. 2786 Hwy 43 North Lawrenceburg, TN 38464 PHONE: (931) 762-4596 24 HOUR-FAX: (931) 829 - 4627 TOLL FREE ORDER LINE: (866) 762-7527 The. 45 + head cc (this is assuming 6cc for valve relief, 9. Dan Whittmore worked for Pontiac as mechanic years ago. 3 to 1 vs 9. 77 valves, screw-in studs, but can vary in volume from 68-75cc. In our last issue, we began our foray into the world of airflow, as. 57 + head cc (assuming 6cc for valve relief, 9. Said he could tell from the way that they had been bored when born, so I now have my answer on these heads. Mar 22, 2015 · When Pontiac developed its 1955 287-ci V-8, its cylinder head featured a compact intake port that displaced slightly more than 150 cc. 87 for deck height volume) Apr 18, 2009 · All the '69 #48 heads had the large 2. Sep 23, 2006 · Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. 75 with 16 or 62 heads. 77 valves. Dec 30, 2006 · There are 2 different #48 heads. pontiac head chart casting number year factory application chamber vol# cc's exhaust port noteworthy attributes 528511 1958 370 62 d-port 1. Head # Valve Size CC or CR; 1955: 287: 192, 205, 216, 227 HP 72 cc: 400: 330,335,350/366HP: 62/48(MT) 2. Part Number: EDL-60595 5. Here are some of the numbers He gave me. There are four stampings on the 5c's. Contrary to belief,48/62/16/12/13 are all rated 72cc. Both 72cc (400 manual trans and RAIII) and 66cc (350 HO) chamber versions were offered. The 400's were in the 73-75 range. 023" deck height on 4. Gasket matched the intake and exhaust ports, a little clean up under the valves and that motor was a beast. Not true Private manufacturers offer heads that will bolt onto your Pontiac V-8 block. com Tiger aluminum head - Kauffman Racing High Port aluminum head - Edelbrock aluminum head Compression Calculator by Block Compression Calculator Simply fill in the form below to calculate your compression ratio Bore: (diameter) in. 00. 88 Apr 4, 2023 · I picked up my heads and the machinist at the shop thats done thousands of various heads over the last 40 years took a quick look at my 48's and told me they were for sure the 72 cc heads. 48s 65. Jan 9, 2021 · BIG difference between 6X-4 heads at 92cc and 6X-8 heads at 101cc. Did the 93cc 6x heads on a 455 and milled 30 thousand off them. 5 CR in both. May 6, 2012 · Here's one reason why: If you have a head that has the "big valve" 2. 020", that will increase the chamber volume by 1. He checked and recorded the ccs of untouched heads. Even with a nominal volume of 75cc, a 400 w/ flattop pistons will still yield an SCR of 10:1, too high for 91 octane. 970" deep scallop 1. Apr 22, 2005 · I do not believe there were two different 48 heads. 77 valve sizes came in all of the 72cc '68 #16 400 heads. The premise that there may have been two versions of the 48 head remains unresolved in my mind. heads and #48 and #12, all said to be 72 cc. Used custom Autotec pistons for 9. That's nearly a full point more and the cam for the higher compression engine needs to have close to 10 degrees more seat timing to maintain a safe margin for pump gas considering The above figures assume 10 cc for . Head: Part II . Same 2. 170"wide scallop 3. Same heads different cc's. I then verified it by cc'ing 2 different pairs of 350 HO heads and several 400 #48 heads. To correct for deep valve reliefs, add relief volume to chamber volume. Best performance head 1970 Ram Air IV Jan 16, 2022 · 16 or 62 heads because 45 heads are low compression heads and I believe are small valve heads also. If your going with a fresh rebuild pretty any large valve screwin stud head can work. 16's are a step down because they have smaller valves. The key here is the right heads for a pump gas 400 with regular 4 valve relief pistons WP HEADS YS ZB screw in studs same pressed "6H" sub code "H6" subcode no subcode K093-K133 date codes K093-K103 I103-I213 3. cc Mar 28, 2021 · I found a set of 1970 #64 heads to be a good choice for a street 428. 042" (crushed) head gasket, 6 cc valve reliefs for 400 stock pistons, 5 cc for -. 230" wide same . Beginning in 1968, Pontiac fitted their highest-performing engines with heads featuring redesigned round exhaust ports (shown above). He did not intend to compare them to another version of the 48 head, I believe he was comparing them to more common 400 D port heads which typically are claimed as 72 cc. See full list on wowmusclecars. 146 cc's - and that's just the intake valve. You can go to Wallace Racing for engine and head codes. Which of course is not the case, plain to see by just a look. They are out there just not very popular at least around here growing up. Ultimate. Also you will bump your compression up to 10. 77: Mar 26, 2022 · Adding pictures of #16 H. Apr 3, 2012 · The 48 heads were the heads originally intended for the never-produced "350 H. My current engines are a 434 with #96 heads and another 455 with #48 heads. 5-10. 11" intakes and 1. 7cc for head gasket, 2cc ring area, and 7. Carousel72TRed. it occurs inside Pontiac cylinder heads. I was first told of this from Pete McCarthy. Ships in 8-10 Weeks. 5c head stamped 4, 2. 6 55-60 INT MAN 538177 61-62 389 62 D-Port 1. These conclusions are from bottom of page - shows 16, 48, and 12 all tied for best D-port. To correct for pop-up pistons, subtract dome volume from chamber volume. , and 1973-74 Super Duty 455. Tom Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Item #: CC-00156. 75cc deck height volume. 66 valves, 99-101 cc chamber, on 1975 400" CI w/A. O. Price: $2,295. They are the ones I wanted. There is NO WAY they could get the same comp from a 350 as a 400 with the same Cylinder Head, Performer RPM, Aluminum, Assembled, 72cc Chamber, 215cc Intake Runner, Pontiac, 389-455, Each. Effective Dome Volume: Use (-) for Dome and (+) for Dish. Mar 18, 2020 · Not a whole lot on the pontiac domed pistons. Aug 24, 2017 · The Ultimate Pontiac Head Wallace compares many heads and comes up with his opinion (disclaimer at beginning says take his flow numbers with a grain of salt, but he was consistent with his testing). Pontiac used the same flat top piston in all their engines and used the combustion chamber size to change compression ratio's. 77" exhausts, and those heads have seen a few valve jobs, enough to "sink" the seat into the head by a mere . 8-10 to 1 compression. 88/1. The heads, intended for the 350, had 72 cc chambers. *Pontiac 400 Compression area=25. Since the 350 H. The small exhaust port featured a D-shaped outlet, and the center two exhaust ports were siamesed, allowing for a relatively small exhaust manifold package. 72 cc: Pressed : 48: 1969: 350 HO May 29, 2023 · As pointed out, there are several heads having the "48" number. If anyone has pictures of two differently factory machined #48 heads, one 72 cc and one 66 cc i would certainly would like to see those. kctie uuhisz sudpvwd roir umrq gmbkeg ssti epwvirj yery rmhgh oklt ulmgni aqaw mxfl gqzq