[ChevroletSS]

Hey guys started this new post so there wasnt anymore confusion, Sorry bout that. I have a 94 c1500 roller block (638) fully machined for roller setup and fuel pump. The plan is to get a forged bottom end from howards. This engine is going in a 79 El Camino SS with a 4 speed Muncie Trans, and 3.73 gears. Below is a list of parts I am going to use to try and reach my goal of 500 HP and TQ around there also. What do you all think about these parts? Ill be coming to you all in the future for help and advise while building this and Ill also have pictures posted in the project journal.

Here are two parts list with dyno results. They are fairly the same but Im thinkin one of these would work. Also thinking about going with the E-Street EFI system.

http://www.summitracing.com/search/p...et-efi-systems


Horsepower:503 HP @ 5500 rpm
Torque:517 @ 4500 rpm
Engine:383ci
Heads:AFR Street 195 Cylinder Heads
Compression:9.5
Carburetor:Holley 0-4779 750 cfm
Ignition:MSD Distributor 36° Timing
Cam:Comp Cams 12-433-8 Hyd Roller Cam
Exhaust:1 3/4" Headers
Fuel:93 Octane Pump Gas





Horsepower:491 @ 5500 rpm
Torque:501 @ 4000 rpm
Engine:383ci
Heads:AFR 180cc Street Cylinder Heads
Compression:9.5
Carburetor:Holley 0-4779 750 cfm
Ignition:MSD Distributor 36° Timing
Cam:Comp Cams 12-432-8 Hyd Roller Cam
Exhaust:1 3/4 Headers
Fuel:93 Octane Pump Gas

[vinniekq2]

I like your choices.I hope that Muncie is built up?That really sounds like a fun engine with good manners. If you share the ride with a better 1/2 maybe disconnect the secondary linkage on the carb. If you like shifting gears???? what about the 180 heads with a little more cam timing?

[cdminter59]

I vote for the 503 hp and AFR 195 heads. In IMO the AFR 180 heads are more for a 355 ci engine. Good luck with your build.

[ChevroletSS]

Thanks guys Im sure Ill get back with you for some help on a few things. Tech Inspector got me intrested in those heads. What do you mean by: "If you share the ride with a better 1/2 maybe disconnect the secondary linkage on the carb. If you like shifting gears"

[vinniekq2]

SS thats 2 separate sentences. I would disconnect the secondaries to limit power if my wife drove the car.She already spun out her Jimmy twice on the same hill and same corner.I threatened to enter her in "Canadas worst driver" TV show. Im getting better at cooking,,,,
The shifting gears thing is: If you used the smaller heads,to get the HP back use a slightly bigger cam,giving a little more on top end. This would give you the opportunity to drive it more like a sports car.I like engines that rev freely and that takes a little more cam timing,though not ideal,I think they are more fun

[ChevroletSS]

I actually dont like how fast I have to shift in this car. I cant even count to 1 before I gotta shift to second and the same going from 2 to 3rd. But from third gear on to 4th its nice with what I have in it now but I cant imagine how its gonna be when I get this 383 in there. Might switch to a automatic. As far as rods go. What is the purpose of 6 inch rods compared to 5.7 inch?? Are 6inchers what are in 400sbc?? Im trying to figure out what rods Im gonna go with. Do you need shorter pistons with 6 inch rods???

[vinniekq2]

chev uses a shorter rod in the 400.For you buy a 5.7 or 6 as part of a kit.Do not buy cheap rods or crank,buy quality.

[ChevroletSS]

But what is the difference in the rods besides length???

[vinniekq2]

The deflection angle of the rods at mid stroke compared to tdc/bdc.A longer rod will have the same deflection(determined by stroke) spread over a longer distance(rod length) a lot of unimportant math comes into affect,
what is the piston speed at different parts of the stroke

what is the side thrust on the cylinder wall

which one will produce more horse power(marginal under certain circumstances)

If it was critical,we would all have 318 dodges

[ap72]

Originally Posted by ChevroletSS

But what is the difference in the rods besides length???

weight and side loading and to a lesser extent piston travel.

In general go with the longest rod you can.

[ChevroletSS]

So the longer the rod mean less the piston has to travel up and down. Hey vinnie are you saying a 318 has 6 inch rods???

Thanks

[vinniekq2]

The stroke remains constant,just different speeds at different parts of the stroke and different side load angles.
the 318 has 6.2 rods where a stock chevy is 5.7

[ap72]

Originally Posted by ChevroletSS

So the longer the rod mean less the piston has to travel up and down. Hey vinnie are you saying a 318 has 6 inch rods???

Thanks

total travel is the same, but the acceleration and velocity throughout the travel are slightly different.

[1Gary]

What Howards told me,is they stopped building a 5.7 3.75 was because of thrust side load complaints.

[ap72]

Originally Posted by 1Gary

What Howards told me,is they stopped building a 5.7 3.75 was because of thrust side load complaints.

one of the major reasons to go with a longer rod, the other is that you can lighten your rotating assembly.