292 flow #s

[randy331]

I ran across a set of 292 casting sbc heads awhile back. They had been gasket-matched and bowl-blended. It was a poor job, but I flowed one port anyway. Later, when looking closer, I may have picked the worst port to flow. I did a search and found 292 heads Larry had posted peak flow of 292 cfm. I took it they had been extensively ported.
Here is what the port I have flows.
@ 28" W/ 2.02 valve

.200 127 cfm
.300 177 cfm
.400 206 cfm
.500 239 cfm
.600 242 cfm
I have no I idea if this is good or bad for this head. Does anyone have the following info?
#1 What should this head flow as cast?
#2 Without welding or having the castings too thin, what would be REASONABLE flow #s?
#3 Is going to a 2.05 valve a good idea with these heads?
#4 Recommendations on valve job/angles for this head?
#5 Would you use different valve job for .500' lift than .600 lift cam?

Thanks for any help; Randy

[RL]

Just looking at a Chevy site is says

Chevy Turbo 201/177 std
882 205/142

[greengrinder]

They flow low 200s-220s with 2.02 and a good valve job.
292" – 3917292, or 340292. Both are good performance heads. The 3917292 was found on 1968 327 and 350 engines, had 1.94/1.50" valves, 64CC combustion chambers, straight plug configuration, not sure on the accessory holes, and I do not have any port volume data on these heads. These heads have double hump casting marks. The 340292 was available from GM "over the counter". This version had angle plug configuration, 2.02/1.60" valves, 64CC combustion chambers. These were known as the "Turbo" heads.
Basically if you cant run a vortech style head, and have to run a stock head, this would be a good casting to use. 292cfm out of one of those heads must have been extensively modified, wow.
Kurt

[randy331]

This head is the angle plug (turbo) head. I was just trying to find out if the work done on them helped or hurt, and what would be a good goal.
Any more help is appreciated.

Greengrinder, I didn't know they used 292 on other castings.

RL; Your saying the 292 turbo angle plug head only flowed 201/ 177 un ported.

Does anyone have flow#s on a decent port job. Not welded or epoxied, etc? Flow #s at other than peak lift would be nice.

Thanks; Randy

[Airhog]

[quote="randy331"]This head is the angle plug (turbo) head. I was just trying to find out if the work done on them helped or hurt, and what would be a good goal.
Any more help is appreciated.

Greengrinder, I didn't know they used 292 on other castings.

RL; Your saying the 292 turbo angle plug head only flowed 201/ 177 un ported.

Does anyone have flow#s on a decent port job. Not welded or epoxied, etc? Flow #s at other than peak lift would be nice.

Thanks; Randy[/

I have a set bone stock 340292 I'll let ya know in about a week. I have another set that went 214@28 with very little bowl work and now sits at 237@28with short side done and bowl work. So 200-220 sounds about right.

[bill jones]

-I ported one set of 292's before I ever had a flowbench (in the late 1970's) and then I checked the flow after I got my bench in 1980.

-Valves were steel 2.060" flat head intakes and 1.635" TRW exhaust (might have been a #S2803 exhaust)
-------------------------------------------------------------
-Then some time later I flowtested a pair of ports on a stock head---most likely with 2.02 x 1.6 valves.

-This is an average of all 8 ports at 28"
--------------ported-------------------------stock----------
-------intake-----exhaust------------intake----exhaust
.100---68-----------57------------------61--------56
.200--141---------117-----------------120-------98
.300--189---------171-----------------164------123
.400--222---------189-----------------190------130
.500--245---------201-----------------206------132
.600--256---------207-----------------212------119

-I don't know what the very best ports flowed---never really cared.
-----------------------------------------------
-This set of heads eventually developed a water leak across a seam at the SSR area.

-Didn't weld it up---just put a head plate on the head---sucked a vacuum and squirted some spray carburetor cleaner and let the vacuum suck it into the crack---then I covered the crack with loctite and sucked the loctite into the crack.

-Never had a water leak after that repair.
-------------------------------------------------------------
-Personally I would probably not go larger than a 2.050"intake and if I was going to HAVE to buy new intake valves I would get 2.050's.

-I wouldn't waste a lot of time on changing the valve seat angles---but I do NOT like to ever use 60 degree in the exhaust bowl----I use a 52 instead and then hand blend and make a nice roll from the 45 to the bowls.
-Using multi-angle Serdi type cutter blades I'd use a nice round roll from the 45 into the bowl.

-Probably maximum unshroud of the intake shroud wall is a good idea.

[highVE]

I've actually got a set on the shelf a customer supplied thinking they might be a good choice. (he got them for the "bubble"). 1 was cracked so we did a differant set of heads (like i originally wanted) anyways....they were ported back in August of 1981, as stamped on the side of the heads. (kinda funny since in was only 1 month old )

They had a 2.08" int valve and 1.6" exh. i flowed them with valves i had at the shop, They pulled to .650" and fell off at .700". max cfm was 278. the intake bowl area was huge, (didn't figure crossection) compared to the entrance. 45* seat, with a top cut that made a poor transition into the chamber wall do to IMO, to big of a valve. For what it's worth they moved 178 on the exh @.650"
Therse are the angle plug castings.

Mike Theroux
www.mikesportingservice.com

[rmcomprandy]

I read this thread earlier so I went back into my records a "few" years and took the flow numbers from an "early 80's" pair of NASCAR "Winston Cup" #292 heads which were ported by Butch Elkins of Diamond/Elkins Racing Engines.
There was NO welding or super thin wall sections as they were for 500 mile engines. Intake ports measured an average of 197.4 cc's in volume; 2.020" int. (10° backside) seats 32°-45°-56°-70°-82° / 1.625" exh. (20° backside) seats 35°-45°-52°hand blended to port venturi.
Here are those average numbers for all 8 ports;
INTAKE
.200" - 137.1
.250" - 166.4
.300" - 195.7
.350" - 217.2
.400" - 234.6
.450" - 243.9
.500" - 253.3
.550" - 262.6
.600" - 267.3
.650" - 272.0

EXHAUST
.200" - 110.3
.250" - 136.1
.300" - 156.6
.350" - 172.6
.400" - 185.0
.450" - 191.0
.500" - 194.5
.550" - 196.9
.600" - 198.1
.650" - 199.3

[randy331]

Thanks everyone, this is exactly the kind of info I was looking for.
Airhog, I'm looking foward to seeing your info also.
I had suspected the low lift flow was down, and it looks like it is. Who ever did the valve job had sunk the intake to the point there is a vertical lip all the way around the valve about .060" tall. At the manifold flange they had opened it up but tapered it down very abruptly just past the pushrod. I've done some work on it and will hopfully get it flowed in the next few days. Now I have some info to compare to.

Thanks again to all that have posted and to those that will.

Thanks; Randy

[maxracesoftware]

i have a ton of old Flow Sheets on #292 Turbo Heads
with various Port Volumes and valve sizes.

Here are a few Flow Numbers (16 years ago)

old pair of Lee Shepherd Racing Heads for SS/CS Jan 16, 1991
305 CID 2.040 Int / 1.600 Exh
SF-600 Bench 4.000" Bore Fixture
Lift__Intake__Exhaust (with short pipe)
.200_126.1__128.5
.300_193.2__184.0
.400_233.6__217.7
.450_247.6
.500_258.2__230.5
.550_264.9
.600_268.9__235.6
.650_272.8
.700_274.4__239.0
.750_277.9

the older Shepherd heads had a few cracks,
so valvetrain was transfered over into new Ron's Heads

old pair of Ron's Porting service for SS/CS Jan 16, 1991
305 CID 2.040 Int / 1.600 Exh
using same valves as Shepherd Heads
SF-600 Bench 4.000" Bore Fixture
Lift__Intake__Exhaust (with short pipe)
.200_118.3__119.9
.300_173.1__157.1
.400_209.9__183.5
.450_224.7
.500_240.5__217.7
.550_251.5
.600_261.2__224.1
.650_269.1
.700_274.0__227.3
.750_279.1

[Ed-vancedEngines]

A little off topic but not by much.

Larry,
Do you have any history on tests of the 034 cast BowTie Heads? I ask this here because I think both the 034 and the 292 Turbo were similar. Am I wrong?

Ed

[maxracesoftware]

Sept 3 , 1985 MadCap Racing Heads 194.0 CC Port Volume
2.035/1.600 C/ED
SF-600 Bench 4.000" Bore Fixture
Lift__Intake__Exhaust (with short pipe)
.200_122.2__115.2
.300_170.5__153.7
.400_212.9__193.1
.450_229.6
.500_243.4__215.6
.550_253.9
.600_261.0__222.0
.650_265.7
.700_266.5__221.1

March 4 , 1986 Meaux C/ED Benoit 2.055/1.600 197 CC Port Volume
57.3 cc Chambers
SF-600 Bench 4.000" Bore Fixture
Lift__Intake__Exhaust (with short pipe)
.200_130.1__118.7
.300_186.3__166.5
.400_228.3__212.6
.450_241.5
.500_257.8__245.4
.550_264.5
.600_271.2__256.1
.650_276.0
.700_279.9__257.0
.750_281.5


October 12, 1985 Meaux 2.055/1.600 Tulip Titanium 209.6 CC Ports
SF-600 Bench 4.000" Bore Fixture
Lift__Intake__Exhaust (with short pipe)
.200_132.5__119.5
.300_188.2__163.1
.400_233.4__207.0
.450_251.3
.500_263.1__236.9
.550_268.1
.600_273.6__250.8
.650_281.9
.700_285.4__262.5
.750_289.7

April 9, 1985 brand new out of box pair of #292's
with 2.080/1.600 valves
HeadBolt Tubes 213CC Ports
only 1 Intake Port finished so far
SF-600 Bench 4.000" Bore Fixture
Lift__Intake__Exhaust (with short pipe)
.200_129.3
.300_188.2
.400_236.5
.450_252.3
.500_270.4
.550_279.1
.600_285.4
.650_290.1
.700_297.6
.750_298.8

these Heads brand new..still sitting in corner of FlowBench Room
gathering dust
the last time i flow tested them was that April 9, 1985
22 years ago

i have 1 more used #292 casting as a spare 2.055/1.600 valve job

[maxracesoftware]

A little off topic but not by much.

Larry,
Do you have any history on tests of the 034 cast BowTie Heads? I ask this here because I think both the 034 and the 292 Turbo were similar. Am I wrong?

Ed

Ed, i have also a bunch of Flow Data over the years on
the #034's Heads.
There are at least 4or 5 versions of these cast iron 034's in
the years they made them.
the first version is not enlarged outward on exhaust side of casting,
so it looks similar to old 292's or SBC heads except for small exh ports

the second version Chevy enlarged the water jacket side on exhaust/
sparl plug outside..so it has a very noticeable exterior , with more metal
around combustion chamber

the 3rd or 4th version was about the same,
but had a dip in intake flange casting where heat-riser was located

The #034 had a higher Ski-Jump Short Turn
with no water above intake ports + smaller CSA exh ports

i have 2 Band-sawed (1)034 and (2)292 heads i could Post pics of
later


Ed if you asked me that same question about 10 years ago,
i'd now exactly all the specifics

i ported a pair of #034's for Benoit's C/ED in 1980's,
according to 3-4 page article in National Dragster "Bayou Bullet"
it was the first C/ED to run in 7 second ET
set Record C/ED at 7.97 ET ??
he later ran 7.80's but not a Points Meet where the record could have
been reset..later switched over to B/ED with Pontiac-Brodix 23deg
raised runner heads 337CID or 338 CID ??

[Ed-vancedEngines]

I was asking because I did a set of the latest of the Cast Iron versions and did not get to check them that I put on a customer engine that has yet to be fired.

Intakes were matched to a Fel-Pro 1206 and no radical reshaping was done, except for pushrod pinch which I mostly got rid of, but port match was carrried very deep into the port beyond Short Turn. The valve pockets were opened some and blended after being cut with a cutter for a 2.05. Same with exhaust with a 1.625. Exhaust port was raised a bunch and widened slightly. all giude bosses were smoothed.

I was just kinda wondering. I know when you usually do one it is far more done than I will do.

Ed

[Ricky Mcconathy]

It's threads like this that make me really respect ya'll "old timers"
I get to see Jimmy Bell fairly often and it's a real treat to hear some of the stories from the guys that have been in this industry for so long.
B/ED sure has come a long way.
Larry, as always, thanks for the great info.
ricky mcconathy