Straub technologies has the patriot head for $700 From his postings the flow pretty good.

 

i submit and digress to the astute engine builders here...

just please ..when a 2005 nissan maxima...smokes your vette... do not blame me....

best of luck bro ..

 

I run a dual plane intake and I've never been beaten by a 2005 Nissan Maxima (whatever that is).

 

The Torker is about the worst type of single-plane intake - a low-rise, single-plane. Given the plenum volume, I just can't see any real benefit from it.

I'd agree that in general a 4-speed car with deep gears could run a decent mid-rise single-plane without major issues - but in this case given the RPM range it doesn't seem to make sense.

 

digress (daɪˈɡrɛs)
vb (intr)

1. to depart from the main subject in speech or writing

2. to wander from one's path or main direction


Scott

 

Personally, I would rebuild the bottom end since you are half way there once you pull the heads or try to replace the rear main seal. It sounds like you need/want low end grunt and a dual plane manifold is what you will need for sure along with a holley carb, cam and headers.Oh and one of the best items for any carburated engine is a MSD ignition system! Good luck.

 

Daltman4437,
As mentioned previously in this thread I have been eyeballing the Edelbrock 2022 Top End Kit. I did some math on it and...assuming your motor passes a good leak down/compression test, then this is an option. I am going to perform a leak down/compression test in the next week or two. looking at all the info here is the compression work up, all assuming you use the Dual Plane intake with the kit as well as your Q-Jet.

Edelbrock 2022 kit gasket info:
Head Gasket:
4.125 Bore
.039 Compressed
8.70 CC Volume

Calculate Compression as follows: ** and my math may not be 100% so corrections please if needed **

Bore: (diameter) - 4.00
Stroke: 3.48
Cylinder Head Volume: 64 (per the kit)
Effective Dome Volume: 0 *assumed as standard from factory
Deck Clearance: .050 *assumed as standard from factory
Compressed Gasket Thickness:.039
Number of Cylinders:8

Compression Ratio: 9.7 : 1
Total Displacement (in.3) : 349.85
Total Displacement cc's :5735.25

As you can see 9.7 is rather nice for a $1,500.00 top end kit, with room to grow, and being on a budget.

 

Not sure if these two are correct.

Piston down the bore is .025 for a stock 350 I thought.

The stock pistons must have at least valve cutouts so piston volume more like 7cc's or better?

If you put a .039 gasket with a .025 deck clearance your gonna end up with a .064 squish band. That distance makes it much more detonation prone.

 

FWIW, there's no "standard" deck height for a factory GEN I engine - I have seen them at .020- and at .050+.

 

All correct. Actual compression on the L82 with 64 CC heads added is right at 9.5 using the correct numbers and figuring .025 in the hole. With that edlebrock cam with an intake closing point of 65 degrees DCR is 7.5 to 1 with aluminum heads. Capable of 320 HP. If your putting this combo on an L48 with dish pistons DCR drops to 6.5 to 1. Very poor combination. There are much better options than this poorly matched top end kit for less money.

 

There's more than 1 post on the forum on the edelbrock top end kits, were the poster is disappointed with the out come. Imo if the op can swing it, afr 180cc + a hydraulic roller, if budget constraints don't allow, contact Chris straub about the heads he selling.

 

This is why I love the forum - great info

 

So the L-82 pistons are 12cc's?

 

Is there a Top End Kit you recommend? I think I am in same boat as Daltman4437, if the bottom end is good, want to keep it in tact. Lets assume our Budget is 2K. All here seem to recommend rip out the flat tap and put in a roller and then AFR heads and an intake. We all also agree to keep our Q-Jet's are they are really good and 750 cfm. I like the idea of the kits as everything is there minus pushrods, rocker's and valve covers. I know having a 350 block we have a lot of options.

 

I think a lot of the top-end kits that are sold don't really save you an appreciable amount of money, if any, if you total up the cost for each individual component. They are mostly for people who don't want to spend the time and effort to pick out their own components.(Not that there is anything wrong with that.) Kind of the "fast food" of hot-rodding. You would be better served by doing your homework, and making your own combo, or picking someone to trust, and going with their recommendation. Billla and 63mako are a couple of guys who have a good rep on this forum; they don't always agree on details, as Billla is a little more conservative than 63mako, but they generally see eye-to-eye on things. You will do well trusting their judgement, if you give them enough info to work with.

At the very least, ditch that big, thick head gasket that comes with the kit, and use a Felpro 1094 gasket. It's .015" compressed thickness, and will help a little with compression and quench.

Scott

 

Here are the actual numbers using a Edlebrock 2022 kit on an L82

Cylinder Head Volume 64CC
Piston Volume 7CC
Gasket Thickness .039 ............. 1094 gasket thickness .015
Gasket Bore 4.125 ............. 1094 gasket bore 4.100
Cylinder Bore 4.000
Deck Clearance .025
Stroke 3.48

Compression Ratio 9.465 to 1 ............. 1094 gasket compression ratio 10.03 to 1

Rod length 5.7
Intake closing point ABDC 65 degrees

Dynamic compression ratio 7.563 to 1 ............. 1094 gasket dynamic compression ratio 8.001 to 1

Quench .064 ................ 1094 quench .040

Just swapping in a felpro 1094 gasket from the one in the kit changes everything. It turns into a fairly good build with good quench and DCR but cam and build are a little big for an auto with 3.08 gears without a convertor and/or rear gear swap. A manual trans and/or 3.55-3.73 gears this is pretty sweet.

Put this top end on an L48 it is pretty bad no matter what you do. You end up with 8.492 to 1 compression and a HORRIBLE 6.808 to 1 dynamic compression ratio. Even with the Felpro gasket you end up with 8.931 to 1 compression and 7.149 to 1 Dynamic Compression. Add some elevation into the mix this is a terrible setup with no redeeming qualities. Put this combo in front of a stock automatic with stock convertor and 3.08 gears your likely to increase your 1/4 mile ET compared to stock and it wouldn't spin the tires. These guys putting these kits together for edlebrock should be in a different occupation.

Edit: Sorry I was a little off on my numbers in the earlier post because I was working off the top of my head. These numbers are right .

 

7cc

 

So 63Mako what would you suggest ? I have an 81 L81 with auto and 3.73 in the rear. Want the same HP as daltman4437 (he has the 79 L82), and want to utilize the bottom end assuming a good compression/leak down test. Suggested make/Model of cam, lifters, rockers, heads, etc?

 

All Stock now? If so, Do you have headers, 2 1/2" dual exhaust and free flowing mufflers? Need that first.
Cam: http://www.summitracing.com/parts/hr...make/chevrolet
Heads:http://www.summitracing.com/parts/af...make/chevrolet
Make sure springs match cam requirements, call Howards cams for requirements and AFR for correct matching spring
Rockers, 1.6:http://www.summitracing.com/parts/cc...make/chevrolet
Head Gasket:http://www.summitracing.com/parts/fel-1094/overview/
Measure after assembly for correct length pushrods.
This would really like a 2000 stall convertor but with your gearing your fine.
This will get you 400-425 hp at the flywheel, good manners and match for your car for under $2500 if the exhaust is done. I would mill the heads .020.
Stock your @ 190 net HP. If this is too much $ look at the Dart 180 SHP or Patriot (promaxx) 185 heads. They will cost you noticeable power. If your ok with <350 HP and want it cheaper go vortec and flat tappet. You will need intake, different cam & rockers. No room to upgrade much.

 

Thanks 63Mako! Got some homework to do (and yes mine is all stock just as Daltman4437. New exhaust is on order for me from corvette central, true dual with magnaflow. I also have the option of adding in a chip from hypertech since my 81 is CCC.