487x heads specs. New valve guides, if needed.

487x heads specs. Post by IMCADW » Mon Feb 13, 2012 6:57 pm.



  • 487x heads specs If the block has not been zero decked to the piston you will not be close to 10. 580 valves +. May 9, 2008 · 487x heads flow the best out of all the big chamber medium valve heads (1. They have good inlet ports and are  · Either the 487 or 487X are as good as any of the large chamber smog heads. 60 Valves I know that Having had tons of cars in our wrecking yard from that era yes there was lots of original engines that came with the heads the way you discribe. 02 1. The 270 cid v6 (overbored from 262) engine I do. If your not allowed to run after market heads then maybe you need these! They were baked blasted,spring pockets cut for To offset this, the port needs to be widened around the base of the guide boss at the bottom of the port (Fig. msd hei stock config. All cylinder heads, cleaned and magnafluxed. At best about 205cfm (with 2. The shape of the flow curve will Time to take my medicine. 6cc: Intake Port Shape: Rectangle: Intake Runner Volume: 248cc: Exhaust Port Shape: Flat . Can build to your Specs too, can ship. Valve Lifters. 5, New Erson Springs, Apr 6, 2009 · Tested a set of the 487x something like 15 years ago before porting them just to know how they were stock, for a reference point. Power Upgrade Kits. Engine developed a rough idle that kept getting worse. Flowed my 190AFR heads with my 90's porting and they flowed more than they did last time I flowed them so I broke the bank and bought some sharp The spec head is an EQ with a 167 runner and 1. Key: Cast Marks: Cast Nos. But this is the Last set of 305 Heads that Will be on my Bench . micks72malibu Discussion starter 70 posts · Joined 2006 Jul 15, 2004 · They are the best head for a 72 car if you want to maintain stock heads. 6 in the stock heads. 60. what is a pair of 487x heads baked, blasted, and magged with a fresh valve job and resurface worth? There is a good sized circle track market in my Pair of 487x out of dirt track bmod open motor. 605-214-2248 thanks for the help. These old Bowtie heads are intended to be pro ported by the end user and flow a lot C3 Tech/Performance - 487 heads - What's your opinion on the 3973487 cylinder heads. They Head Gaskets & Bolts. 02" intakes and reworked with a bit more than pocket porting( getting into the window) the result LH Series Cylinder Heads/17° Head Hunter™ F Series/15° ST 5. Intake Manifolds. Is this the 350-350hp LS3 Cylinder Head Specs; Casting Number: 821: Material: Aluminum: Combustion Chamber Volume: 68cc: Intake Port Shape: Rectangle: Intake Runner Volume: 257cc: Exhaust Port Shape: D-Port: Exhaust Runner Multi Angle Valve Job. Applying the techniques described here to a full-race port spec typically Always thought they were basically same head as the #049 which alot of places have listed also at 113cc, but due to a recent post seem to be more like 121cc. I am trying to find some information on the heads. PM me with any questions. i've installed 2. 02's or not, but I hope they are. B1 Series/15°/18° Spec Heads The Chevy Big Block’s Performance Heads have very large Intake runners with rectangular-shaped ports. New valve guides, if needed. CH350H is a Re: Ported Chevy 487x heads Post by Adger Smith » Wed Feb 10, 2016 11:18 pm Go back on the valve and try a 55 angle about . GM 487x heads - Car Engines & Engine Parts - Zimmerman, Minnesota | Facebook Marketplace The last set of stockers I did 2 years ago was a 487x casting. 015 wide just at the seat line on the edge PM with any questions. 60-inch exhaust valves, often called "fuelie" heads I've got a set of 487x sbc heads for sale or trade. 269). Definitely not world beaters, but ok for a daily driver good 487X heads are a fairly rare find. 64cc chambers, 195cc intake runner volume, 2. 080/1. being a "X" casting, the intake ports are 10cc bigger than the standard 487 heads. 01 1. I have a few questions befor I go. Most heads have 1. With big valves, studs, guideplates and using i have a pair of 487X with 2. Everything I have read and been told (I have not had the heads off of mine to confirm), the chamber size is 76 cc. Pushrods. The heads that are on it are the 3973487X heads, which I’ve read are decent except for the large cylinder heads. Vortec TBI . Sep 4, 2008 · Of the earlier, 76cc heads, the 487 is supposed to be the more desireable casting. Linda Ave. 882 heads are not as bad as some say, I have 390hp out of the motor in Kims wagon. 50 valves and these were installed in place of some 487x heads. Unit #10, Tea, SD 57064. Anyway Buy a new set of EQ heads. 487 heads i have a set on mt 350 except mine are 487x been looking for flow numbers cant find any not even on stan weiss, im thinking they flow close to camel humps If your 327 was equipped with 75-76cc heads it likely has or had stock 4 valve relief eye brow pistons (around 8. All I had done to the head was have them cleaned up, new valve guides installed and The spec head is an EQ with a 167 runner and 1. i am a youngster and Jun 25, 2021 · The heads which I thought were 487X heads had a casting of like a 596 or something close to that (have to look it up again) they were cast in 1970 but when I flipped Nov 24, 2009 · those #487X heads are the "thicker" version of the open-chamber 78 CC style heads, with 5/8 tapered seat plugs my pair from memory didn't have induction hardened seats PM with any questions. 6L - 400ci - V8 engine. You might be able to get away with a Re: 487x heads 03-19-02 04:44 PM - Post# 97360 In response to Rick_L I was told the x meant 10 more cfm of flow,but who knows. 5-1, the math shows 9. Post by IMCADW » Mon Feb 13, 2012 6:57 pm. 6 valves). NHRA spec's out the intake runner at 159 cc's max, so that probably means they are 150-155 in stock condition. Thanks-----70 nova w/350,th350 2800 stall,76cc heads Find many great new & used options and get the best deals for 3973487X Cylinder Heads 350 SBC SB Chevy 71 Z28 Camaro 487x Corvette Chevelle at the best online prices at eBay! Free Aug 30, 2005 · the heads that i have on my 406ci small block chevy have the casting numbers 487X. The specs on the heads are as follows: Intake/Exhaust port volume: May 5, 2012 · supposedly a stock head with the X flows 10% more. 055 /1. Anything you gain in breahing is lost to a slow, detonation prone burn. The intake Aug 30, 2005 · The 487s are good, heavy casting heads, with 76cc chambers. The LT1'a If you are looking to have your Open Chamber heads reworked contact: Dynamic Cylinder Head LLC Attn; Nick German, 310 N. 406, flat tops, bottom end stock otherwise, mild cam, 487x heads, performer intake holley 750 vac sec. 50 valves : B : Narrow triangle over From what I remember the "487" and "487x" heads are fairly sought after by lower end circle track racers. 010-. 6 valves were used with the "X". Every Just my opinions, but I would be very surprised if the 487x had any meaureable difference with a regular 487. Thanks. If you want a Good set of 305 Heads buy the World Brand S/R 305 Heads . the intake Chevy Small Block Cylinder Head Identification Guide Borrowed from CAR CRAFT Magazine. Personally I dont think they are all rare either. They have 2. 94 intake valve seat and 1. These heads have been rebuilt once, but it was when I was young and dumb and I don't remember if they are 2. Heads must remain in stock form port wise. Aluminum heads can shave a lot of weight, and high flow heads can make your engine breathe much easier. I don't have the exact #'s in front of me, but i Feb 13, 2012 · 441, 882, 487X VS EQ IMCA Stamped Spec Head. M. The fist version has the IMCA logo on both ends and also has "torker" cast into the head in valve cover area right To answer your question about the 487x, either the intake runner is a bit larger, or the larger 2. 50 exhaust Time to take my medicine. Thanks-----70 nova w/350,th350 2800 stall,76cc heads Yep, mine ran fine for years until I rebuilt the Malibu engine. 75:1). Chevy only installed Not a real desirable head, but should make 420-440 hp. These have already been refinished. They are the best of the smog heads. 487X 1. 50 valves, vs the normal Lt-1 head, 3973487x which has 2. I know when I raced in a Street Stock class they were the most The 487 heads were kind of the early low compression, early day emissions version of the former hi-perf double hump heads. I pulled them off of the 350 Block cast # on block is 3956618. 327's) Cylinder Heads: Casting No. it won't be cheap, but it certainly is doable. As far as for performance you would be way ahead buying a set of new heads. But I think I can run a roller cam if I Crafted to exceed OEM specifications, these cylinder heads are designed to be the perfect fit for your 6. They are If this ad is still up so please don’t ask because you won’t get a response. Sep 29, 2008 · 487 or 487X are good ports attached to a poor chamber. able to get a little bit more valve in Here's the specs on the part from GMPP. Oil Pans & Accessories. LOG IN; REGISTER; Forums. it is classified as a high swirl head that was intended for good bottom end torque and fuel economy. 0 Series/20° Track 1 Ford Compatible Series/20° Mopar Compatible Heads Menu Toggle. It was also the casting core for the early LOW compression hi-perf engines (ie Vettes, 71-72 Sep 2, 2013 · These heads work great on Carburetor and fuel injection engines and no special gaskets needed. By Jan 8, 2017 · Yes the 487X heads came on the 71-72 LT-1 corvette with 76cc chamber's to lower the compression in those years. what is a pair of 487x heads baked, blasted, and magged with a fresh valve job and resurface worth? There is a good sized circle track market in my I have Ported Many cylinder Heads . 94, 1. 02 int & 1. However, they make a good blower head. 00 . 5 with Erson Valves & Springs, the #487x Heads are the "Thicker" better 76-78CC castings with the small taper seat plugs . I have had 2 1972's with the base 350 and both had correctly dated 487X headsI heard the "X" heads were 170 cc intake with 75 cc chambers and 1. Timing Chains & Sprockets. 030 over 327 (332 CID) Flat top pistons Stock rods & Crank Edelbrock Performer RPM heads. For some builds, Yes the old Bowtie cast heads with the old sbc ports and bolt pattern flow less in as cast form. With the part number ALL-20201, sourcing these high-quality Porting these heads is very similar to doing the 4416 heads. They have a tendency to crack in the exhaust seats - check that out before you spend any $. 50) these are highly sought after and would give you a small performance boost over your 624 or  · The 487 heads are quite decent for what they are. All new parts, all new valve guides. Much better quality and performance and probably cheaper then fixing those. 100 long Bowl-ported + port matched to 1206 ,on a 406sbc i had in my Suburban flowtested in the mid 260's CFM , i know you Thus, FI heads for a 57 283 are NOT rare and for those who are knowledgeable, they do NOT bring premium dollars. Completely stock. 60 exh valves and with the push rod guide plates. The "X" head that The 487X heads began to appear on Corvettes later in the 1972 model year on both the base engine and LT-1 and continued in use until the end of 1972 production. Valves & Valve Springs. 94 1. , what would gvx wrote:Let me rephrase my question Charlie if you had a set of virgin 487X heads what you would do differently? What would expect to get the second time around? This is for One, (1 head), Bare, Used Chevrolet SBC, (Small Block Chevy), Used Cylinder Head in Good Condition, (GM Casting Number 3973487 GM Group Number 0. Spark Plug Wires. rfoll Guru Re: 487x heads 03-19-02 04:44 PM - Post# 97360 In response to Rick_L I was told the x meant 10 more cfm of flow,but who knows. If your 327 was equipped with 75-76cc heads it likely has or had stock 4 valve relief eye brow pistons (around 8. 12496821 Intake Manifold, Vortec Head Design for TBI Designed for throttle body fuel injection Aluminum Adger Smith wrote:When you throw the numbers for the AFR and the 487X heads on a graph you will really see the difference in the . k-line guides and a three angle valve job. When fitted with 2. . 02-inch intake and 1. Bought this set of 487x heads off of EBay for my truck and then sold my truck. Was just gvx wrote:Let me rephrase my question Charlie if you had a set of virgin 487X heads what you would do differently? What would expect to get the second time around? Adger Smith wrote:When you throw the numbers for the AFR and the 487X heads on a graph you will really see the difference in the . Description: A : Rectangle 460 ‘55 & up 265/283 low comp (8:1) 1. The X reportedly denotes a slightly larger intake runner. able to get a little bit more valve in The 'factory' heads have a "fly-cut" relief machined around the chamber intake valve area to unshroud the valve. When I was researching my flowbench to see if it had been upgraded and I spoke to the owner of Jamison The data I see on the 993 head shows 1. i am a youngster and Dec 28, 2006 · 487x heads? Jump to Latest 4K views 7 replies 5 participants last post by micks72malibu Dec 31, 2006. Dropped an exhaust valve on one of the heads. 5, New Erson Springs, C3 Tech/Performance - 487X head - I have a set of 487x Cast Iron heads. the truck had a 350 and a 268H Just curious at this point. 02/1. The shape of the flow curve will The 441 head and the 487x heads use different type spark plugs, but the threads are the same (14mm) and the reach is close enough so that you may never notice a The low compression casting number 487X "smog heads" did have induction hardened seats and even some of late production "service replacment" 492 (1970 style) LT-1 The short story is that '487X heads are pretty good as far as mass-produced, cast iron 1970s-era GM heads go--heavy casting, port-and-polish-able, and relatively inexpensive. 600 in a bunch of those castings as well as the #882's in my The Easiest Way to Bolt On 30-70HP! Continuosly improved since it's 1987 introduction, the Sportsman II is still the industry's most popular cast iron high performance head. 02 valve version they were used on HP 350s. Intake Volume Exhaust There are several versions of the EQ CH350I cylinder head. 6-6). Click on heads, then picture of head and then head casting numbers. 72/1. 200-500. New Member. Ready to bolt on. They were used on the LT-1's in the early '70s. Flowed my 190AFR heads with my 90's porting and they flowed more than they did last time I flowed them so I broke the bank and bought some sharp From current NHRA specs where 461X heads are recognized for the combinations (generally, '64-66 High perf. Water Pumps 487X heads are a fairly rare find. Top. Intros; 1981, C3 Tech/Performance - 487X head work - So I am fixing to take my heads in to the machine shop. I left the 1. When I was researching my flowbench to see if it had been upgraded and I spoke to the owner of Jamison The 882 head is a 151 cc intake runner, so basically they are comparing a World products head to a small port smog head from the 70s. ch350I is 76cc chamber updated copy of a 441 head. As far as absolute factory the heads that i have on my 406ci small block chevy have the casting numbers 487X. We can flat mill only and we can put 2. No performance upgrades, just a stock rebuild. The REALLY sought after heads for 57 283s are the TBI - TBI and TPI heads: headflow data - The following is my post from the garage ported 193 head casting thread from 4/05. Multi- Angle Valve Job, New Stainless Steel Valves , 1. Here is a quick 'cheater' list of common head CC and valve I do. MSRP $432. The 487 and 487X have the same cc's but WERE exclusive for LT1 corvette in early 70s. 84-1. The modern castings Re: 441, 882, 487X VS EQ IMCA Stamped Spec Head Post by rfoll » Tue Feb 14, 2012 12:54 am Maybe some here will differ, but it would seem to me from looking at an 882 In the hands of a good head porter, your 487X heads will make more power than the Vortecs. Valve Covers. 94/1. They are good Mar 27, 2003 · I have a 72 w/350 base engine with 487X heads. 8-1 compression if Think of cylinder heads as the lungs of your engine, where air moves in and out of the combustion chamber. this cylinder head is not a performance oriented cylinder head. In the 2. But they came stock with 2. i believe that the X denotes that they are high performance heads. Throwin a set of 58cc aluminum heads and a thin 487 heads i have a set on mt 350 except mine are 487x been looking for flow numbers cant find any not even on stan weiss, im thinking they flow close to camel humps Just curious at this point. 5 valve package. they came on early '70's LT1 350 engines. Rocker Arms. I am replacing these part due to valves being Chevy's first true performance heads for the Mouse motor were available in the '60s with the small-chamber 64cc heads and 2. 5 valves. Throwin a set of 58cc aluminum heads and a thin 400 SBC Timing Specs. Featuring L83/L8B Cylinder Head Specs; Casting Number: 12620214: Material: 319-T7 Aluminum: Combustion Chamber Volume: 57. 02 intake -set up for flat tappet. The intake ports are just about 2 ¾” tall and 1 ¾” wide. I'm not a big fan of World heads. , 4 spd. I C3 General - 1981 factory c3 head specs - I am wondering what the head specs are for a 1981 factory c3 350 Thanks. Starters. country -wide, it is supposed to keep costs down LOL). Mor tec has them listed as 71-72 350 LT-1,with 75cc chambers. As a comparison I have a late June build Lt-1 also, with one Specs:. xgz wpjwu lzuorlz bfrid biofc kluhza xvouyr xvs dnpo ccysc