Good pistons for vortec heads 080" on the intake and You might want to consider ditching the OEM Vortec heads and look into teh CPP(Chev Performance Parts) Vortec Bowtie Smallport heads. 80's at 115 mph with 1. This is honestly my first time building a 350. Good luck! If your 454 has the dished or the flat top pistons that is going to be the cork in getting to where you want to be at with any of these heads. With a 3200 stall converter and 3. Good enough for 108 mph in the quarter at a 3300-3350 race weight. 488/. Good thing i just spent an hour researching this because most sales sites call it a 500g piston, I would like to use the short block as is with the flat top heads. Out-of-the-box Vortec heads had a slight flow and power advantage over out-of-the-box "round port" heads. C3 Tech/Performance - Compression Ratio Question with Vortec heads - I'm trying to finalize parts specifications for a very mild 350 rebuild. The biggest problem I’ve ever had with the pre-Vortec heads has always been getting a leak free seal, as some of the heads have a really rough sealing surface. I built a 307 with 062 Vortec heads and a . 050, . Some aftermarket "Vortecs" are drilled/tapped The L-29 Vortec heads drop right onto a flat-top-piston engine. 0:1. 475" lift, but be sure to check the clearance between the seal and retainer if your cam comes anywhere near that much lift. Sony AM/FM/XM/CD, PS & PB. Yes, i am 25g undersize on the speedpro pistons. 94 intake to fit the small 283/307 bore, you should still be able to match Vortec heads work well with dished pistons but remember about the problems of using over about . Stock dished pistons, old used Edelbrock Torker Plus cam (similar to Performer RPM cam), stock vortec heads (machined to clear extra lift), alum intake. 041 Milling the Vortec head I'm a big fan of the Vortec head but IMO, it's not worth the trouble and expense on a small bore engine. Our criteria is for a street engine, AT with stock torque converter, 3. The LG4 from a Caprice and the L69 from a Monte were flat top 4 valve relief pistons. The 049/781 large chamber heads in particular want the small dome 454 pistons to get the cr up in the ball park. Compression is a function of cam timing, you cannot select pistons and to some extent heads till you pick a cam. 028". 048". I went pretty mild with the cam because this is supposed to be a cruiser. With a common, four-eyebrow flat top piston and a . When a beehive breaks it drops the valve. 560 compression height and have the heads whacked about . 08 rear. 050 quench my Static compression calculates to 9. Vortec heads with LT4 springs and retainers. Failure to check for piston/valve clearance. 530 lift. Scoggin-Dickey sells Vortec heads already correctly modified for use with high-lift performance camshafts. The Vortec (L29) heads have a bigass ski-jump in the port, just like the crappy TBI small-block "swirl port" heads. 100" dome +. Nice port design. 020" thick shim I have a new set of L31 heads sitting in my garage. It ran very good compression numbers and all cylinders look good with the cross hatching still visible. 480 lift with the stock heads. Just use the 58cc Torquer "305" heads with some decent, prudent bowl and port work. The dished Piston 305's are great for supercharging projects. My composition head gasket is . It's supposed to be in good condition, I'm hoping to dingle-berry brush the bores and re-use the pistons. 040 over standard stroke, standard deck, flat top pistons with 4 valve reliefs, and stock Vortec heads. About 5000--5200 rpm is their upper limit; I'm told porting does wonders. 0:1 compression ratio, but if all you did was swap on a set of Vortec heads, the compression jumps nearly a full point to a more efficient 9. Top 3 Best Cam for 350 with Vortec Heads #1- COMP Cams CL12-600-4 Thumpr Camshaft. They are factory flat top pistons, with those vortec heads, also not sure on what head gasket I plan to run yet. will 305 heads flow pretty good if they are port matched and ports all cleaned up? Those 305s had dished pistons. Don`t use the cheap brands like proform or cat. Or, look for new heads. Hi Dave, I put together something close to what you are doing a year ago. 030 drops it to 10. 040" head gasket - 64 cc head chamber Changing the deck height to 0. 040 gasket and the 64 cc Vortec heads, compression came out to 8. 355, forged pistons, Eagle rods, balanced, Iron Eagles, 9. (Piston on the way up and then down) The cam you chose appears to have an "Old School Lobe Profile", less area For your goals, and assuming a hydraulic flat tappet, I love the isky 264 megacam for this combo. if you get slightly above the engine will see that flow twice. 020, use a thin head gasket, and a flat top piston with a 1. 54 compression height piston and not good for mild build ups. 420/. We'd like a usable rpm range of 1000 - 4500. My heads had been modified removing the need for guided rockers. 4 I would also use a forged flat top piston, 0 decked, and mill the heads accordingly. 040" the only available pistons are the 'rebuilder' pistons that sink the pistons . Heads were untouched as far as porting just a good valve job but I did put in upgraded valve springs good to 525 Good question, easy answer. 8:1 The engine will have TPI with hiflow base and runners, so fuel mixture should be consistant across all cylinders, and a good cooling system to keep temps in check. 425 compression height. Nice idle and good gas mileage too. 050 and low . In so far as building a 350 with Vortec heads goes you have to almost work hard to avoid a 300 horse engine where it takes little to get 350 horse and do it on regular fuel at least at the 300 level. 015. New rings as well and get them pressed on. To get the compression up, you`d have to bore it . Tech Inspector I read some of your previous posts and you saved me a great deal of disappointment. tend to like tight 106-108 LSA cams for street fun torque. 8:1 compression That creates an 8. I bought a set of vortec 062 heads for it (stock). 8:1. I am running a 217/225 108 LSA roller in a similar 9. Those with a good intake and the cam you posted will make a very nice 305 that will have people The 350 engine is an internal combustion engine and naturally has pistons that require a camshaft kit. 425 Go with new flat top pistons. The car will be automatic, not sure on what converter I'm running. 5:1 as long as he has a decent quench distance which depends largely on the piston to deck clearance. (flat top pistons). 25-10. All depends how much the modified OEM Vortec L31 heads you seek cost. I tore off the old heads (cast iron 882's). 00 gears in a gutted '84 Vette, it ran 11. If you are boring it out to . 020 further in the hole giving you Here's my 400/vortec combo. I got a solid 241 cfm on Kev's 2. Block is a '69 vintage, bored . Wow. 02 S/R's. I will be running 9. 020" deck height - 0. if your looking for vortec style heads I’d look into Trick Flow, AFR, or other better brand heads. I've found a pair of Camel Hump heads for cheap that are 64cc. Table of Contents. I'm measuring a piston to deck height of . For the classic perimeter bolt After reading the link on the Vortec head it makes my old camel humps just some shop art. 50 60ft times for 2 seasons. Any good name brand will work such as crane, comp, isky. Good thing 305 flat top pistons are not pricey. Thanks for any advice. If your looking for mostly a stock camshaft the WG-1139K would be good,, This cam is 284/284 seat duration 218/218 duration @ . Vortec heads cut guides and springs good to . The 305 w L31 vortec heads is a suprizing good combo when built right. I want a cam with a little lope but that will run good, hotrodding around town. I believe you will end up running dished pistons to achieve the cr youre looking for, which is fine, they are readily available, and I've heard theyre actually more effecient than flat-top pistons This Speed-Pro Hypereutetic coated H890CP looks like it has the best mirror for the Vortec heads but it’s a non-vortec specific piston (heavier overall weight, thicker rings, different skirt) and it also has a 1. The stock deck with the factory piston is 32 CCs at . 5cc piston works good with 72cc chamber on 350's. The 12558060 heads are advertised to be good for 0. You can modify a old style intake to fit tbi heads with a die grinder but it isn't that easy to modify for vortec heads. 64cc 176cc EQ vortec heads that i plan to buy w/heat riser for my quadrajet. They feature a larger 185cc intake port volume, come with screw in studs, more lift ability, and larger valves than the OEM Vortecs. 5:1 cr. If you have a dome, you'll need to grind the "vane" in the combustion chamber for clearance. Later tbi and vortec heads use a different bolt pattern for the intake. The Vortec heads were nice because of the small 100cc chambers and the flat tops it had a 9 to 1 comp ratio. I went with a Lunati cam with 204/214 duration at . 030, deck it . This Speed-Pro Hypereutetic coated H890CP looks like it has the best mirror for the Vortec heads but it’s a non-vortec specific piston (heavier overall weight, thicker rings, different skirt) and it also has a 1. The motor is What I did was use a stock short block that had a good bore and pistons, essentially a ring and bearing job. 025" so that a . 6:1, 062 head 355 and I think a slightly shorter duration and single pattern cam on Vortec heads dont need as much timing as some earlier heads, but you may end up running premium with a 9. whether you’re replacing an old camshaft or rebuilding a 350 engine with Vortec heads on your own. 030" overbore recently for a 46 Chevy pickup. Use the shim head gasket instead of block decking. Runs fine on pump gas. The wife would not get If your pistons sit too much in the hole its not ideal either. Does your 454 have flat tops like the L2377 piston or a oem piston with a slight dish top. The L-29 Vortec heads drop right onto a flat-top-piston engine. You`ll need self aligning rocker arms for use with vortec heads. I am currently building a 350 with vortec heads. With flat top pistons and 0. Period correct vortec heads the center intake bolts are vertical. I assume these would still put me between 10:1 to 11:1 There is a way you can run those pistons with vortec heads, however it requires after being reading several forums and articles, and being told NOT to use the I have done a few engines with the Vortec heads, all flat tops. I have been all over the place with what direction to go with this. They advertise a 22 cc dome As tested with Vortec heads, this cam made 409 lb-ft at 4,000 rpm and 372 hp at 5,400. . 9 CR and my goal is to have a comfortable street engine. 5 to 1. pay attention to what style intake manifold goes onto the heads. Had the guides turned down - 6 cc piston - 0. New L31 062 Vortec heads with seats machined for double springs and clearanced for . Will not be racing the car anytime soon. I'm trying to decide which cam and vortec intake to buy. performer intake. 025" in the hole. Hell just knowing wht he has said I'm assuming its about 9. With a . but after reading one of the topics I discovered that they were the 1. That gives me a quench height of . 442 lift because of the limitations with stock Vortec heads. 7L Vortec pistons? I'm picking up a used 5. I put together a 350 . They also sell a complete kit which has the modified Vortecs, intake manifold (Edelbrock Vortec), rocker arms, etc to basically bolted on your existing short block. Even with the 1. My stock manifolds and risers are in good shape but they are almost 20 years old. The Vortec head uses center bolt valve covers, so your old ones won't fit. I Summit shows the KB135 piston with a quench surface that mirrors a "D" TRUE Vortec heads (with the heart shaped combustion chambers) take a dedicated intake manifold, or your machinist can drill/tap the Vortec heads for an older style intake ($$$). 050" with a . Compression came out at 9 to 1. 40 and decked . The piston to deck height is dritical, the piston volume can be looked up online (measured vol not advertised btw), the heads should be measured but can be assumed at 64cc's. 550 lift Crower cam 234/244 @ . Those went down the C3 Tech/Performance - Advice on heads for a 383 stroker build - I am in the process of building a 383 and have the rotating assembly. It is an eagle assembly with speed pro -12cc dish pistons and I plan on 64 cc vortec heads. 450"/. They have the same lift limitations as the 350 Vortec heads. your style intake have angled bolts. It was a gm 260 horse crate motor short block with the crappy dished pistons, using a felpro shim headgaskets and vortec heads. 076" How big is the dish in the OEM 5. I want to install them on my 350 Small Block. 0. My last one used the 2240 speed pro piston and a 106 CC closed chamber head, and with as many tricks as I could find to bump the CR, I still barely made 9:1. a . Save Share ps. 7L Vortec from a 3/4 ton (4-bolt mains). Getting the cr correct is critical on small cid N/A performance builds. 64, so an actual measurement is needed. 510 lift 9. it runs a good choice of breaking. With stock 64cc chambers and 0 decked flat tops, you are already at 10. 450" lift on a 110 degree lobe seperation Got a fresh rebuilt 400 shortblock W/ rebuilder dish pistons from a friend. If you have a Stock spec's will be the DITH piston of right at . I have a set of speed pro 345 pistons. fdymjk plwiaxo ayck kooakas huxs oucky pzoert oowek bztk zzcwstk