Help Me Build a Chevy 350
09-05-2003, 05:58 PM
#41
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Re: Help Me Build a Chevy 350 My SBC in my boat will give you a idea of what it takes to make 450 hp and 428 tq at the engine.
5.7L 4 bolt main Jasper Marine Shortblock
Bored .60" to 360 cubic inches
224/224 .480/.480 112LSA Cam
AFR 195 Aluminum Heads with 2.02I @ 1.60E
2.450" Dual Valve Springs
Edelbrock Performer RPM Intake
Lunati Gold Race Forged 1.6 Roller Rockers
Lunati Chromoly Hardened Pushrods
Holley #4479 Double Pumper 750 CFM Carb
A more aggressive cam would really add some life to this setup but in a marine engine you need a cam that will idle at 900 rpms max otherwise it is very hard on the boats lower unit shifting into gear and reverse with a cam that idles above 900 rpms.
5.7L 4 bolt main Jasper Marine Shortblock
Bored .60" to 360 cubic inches
224/224 .480/.480 112LSA Cam
AFR 195 Aluminum Heads with 2.02I @ 1.60E
2.450" Dual Valve Springs
Edelbrock Performer RPM Intake
Lunati Gold Race Forged 1.6 Roller Rockers
Lunati Chromoly Hardened Pushrods
Holley #4479 Double Pumper 750 CFM Carb
A more aggressive cam would really add some life to this setup but in a marine engine you need a cam that will idle at 900 rpms max otherwise it is very hard on the boats lower unit shifting into gear and reverse with a cam that idles above 900 rpms.
09-08-2003, 04:18 PM
#42
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Re: Help Me Build a Chevy 350 So I was talking to my boss about heads today and he was telling me to get the stock GM heads machined to 2.02 fuelies. Save money, just as good, blah blah blah.
Now this guy is the owner of a mechanic shop and is damn good at what he does, his brother told me to do the same thing and he used to build engines for a living. These guys are smart, but very opinionated too. I don't know what the hell to think anymore, throw info at me.
Now this guy is the owner of a mechanic shop and is damn good at what he does, his brother told me to do the same thing and he used to build engines for a living. These guys are smart, but very opinionated too. I don't know what the hell to think anymore, throw info at me.
09-08-2003, 04:40 PM
#44
Re: Help Me Build a Chevy 350 OK, I've owned the original '70 LT1, a '93 LT1, and a '01 LS1. They're all good engines, but for $2500 at a wrecking yard you can get a good LS1 out of a '98 or '99, and install it in the ride of your choice. I would go this route if I were you; the LS1 is a better engine and much easier to work on than the other two.
09-08-2003, 05:42 PM
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Re: Help Me Build a Chevy 350
Which stock GM heads? I think that advice is crap. This is why I see cammin' old cars that run 14's at the track.
Note that he does have these same heads he speaks of on a '57 Bel Air, it just barely inches out a '96 SS with about 280 crank HP from 80-120.
09-08-2003, 05:46 PM
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Re: Help Me Build a Chevy 350
OK, I've owned the original '70 LT1, a '93 LT1, and a '01 LS1. They're all good engines, but for $2500 at a wrecking yard you can get a good LS1 out of a '98 or '99, and install it in the ride of your choice. I would go this route if I were you; the LS1 is a better engine and much easier to work on than the other two.
09-08-2003, 07:34 PM
#47
Re: Help Me Build a Chevy 350 Understood, but keep in mind a lot of what you are learning doesn't even apply to todays engines; sadly its obsolete technology. Buy someones blown LS1 for cheap and rebuild that: you won't have to scrape gaskets, you will learn about torque-to yield fasteners and PCM tuning, and you will have a very good engine you can be proud of when you are done. JMHO . . .
09-08-2003, 09:48 PM
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Re: Help Me Build a Chevy 350
Message JnJSpdShop on AIM and ask about his trickflows. He has a nice set that already have alot of money into porting, etc.. I believe he might have flow numbers too.. I can't remember.. he is only asking $800, and they have a ton of money in porting.. I would have loved to buy them for my v8 s10 before I sold it last week 
-Josh
-Josh
Aluminum Trickflows
2.02 / 1.60 valves
64cc chambers
ton of porting
flow numbers are coming soon
have about 2,000 miles on them
spring with dampener from TPIS good to a .550 lift.
Asking $850 + shipping
So what do you guys think about that? Unless something is wrong with the heads it sounds pretty good to me. One thing I need to know is who JnJSpdShop is, and if I can trust him. Anyone know him or ever done work with him?
09-08-2003, 10:36 PM
#49
Re: Help Me Build a Chevy 350 As for the ProTop Lines being too much for the street, nonsense...there is no such things as too much cylinder head...just too little engine. 
Build a 406 the 56 extra cubes will help with the bigger heads. A 406 with 6 inch rods can be a sweet engine. Basicaly just a bigger 350.
Build a 406 the 56 extra cubes will help with the bigger heads. A 406 with 6 inch rods can be a sweet engine. Basicaly just a bigger 350.
09-08-2003, 10:39 PM
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Re: Help Me Build a Chevy 350
As for the ProTop Lines being too much for the street, nonsense...there is no such things as too much cylinder head...just too little engine.
Build a 406 the 56 extra cubes will help with the bigger heads. A 406 with 6 inch rods can be a sweet engine. Basicaly just a bigger 350.
Build a 406 the 56 extra cubes will help with the bigger heads. A 406 with 6 inch rods can be a sweet engine. Basicaly just a bigger 350.
09-09-2003, 01:23 PM
#51
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Re: Help Me Build a Chevy 350
As for the ProTop Lines being too much for the street, nonsense...there is no such things as too much cylinder head...just too little engine.
Build a 406 the 56 extra cubes will help with the bigger heads. A 406 with 6 inch rods can be a sweet engine. Basicaly just a bigger 350.
Build a 406 the 56 extra cubes will help with the bigger heads. A 406 with 6 inch rods can be a sweet engine. Basicaly just a bigger 350.
All this talk about SBC being "obsolete" technology is bunk as well. The principles of engine building are universal, and from what I've read in your posts, that seems to be exactly what you're looking to learn. You're on an LS1 site, so naturally you're going to get pushed in that direction, but believe it or not, engines existed before this platform.
There's nothing wrong with doing a SBC buildup. The 23 degree SBC will be in tons of cars down at the dragstrip for years to come. My advice stands. If you plan to run this on the street more than the track, skip the huge ports. Without a huge cam, there's no point in the big port volume, and big cams don't like street driving either. You'll end up with a huge stall converter, compression above what pump gas will support, and a car that you'll be looking to sell.
09-09-2003, 01:40 PM
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Re: Help Me Build a Chevy 350
As for the ProTop Lines being too much for the street, nonsense...there is no such things as too much cylinder head...just too little engine.
Build a 406 the 56 extra cubes will help with the bigger heads. A 406 with 6 inch rods can be a sweet engine. Basicaly just a bigger 350.
Build a 406 the 56 extra cubes will help with the bigger heads. A 406 with 6 inch rods can be a sweet engine. Basicaly just a bigger 350.
All this talk about SBC being "obsolete" technology is bunk as well. The principles of engine building are universal, and from what I've read in your posts, that seems to be exactly what you're looking to learn. You're on an LS1 site, so naturally you're going to get pushed in that direction, but believe it or not, engines existed before this platform.
There's nothing wrong with doing a SBC buildup. The 23 degree SBC will be in tons of cars down at the dragstrip for years to come. My advice stands. If you plan to run this on the street more than the track, skip the huge ports. Without a huge cam, there's no point in the big port volume, and big cams don't like street driving either. You'll end up with a huge stall converter, compression above what pump gas will support, and a car that you'll be looking to sell.
09-27-2003, 03:50 AM
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Re: Help Me Build a Chevy 350 Well, back from the dead!
Here are the flow numbers for the heads, what do y'all think?
__________________________________________________ _
Cylinder Head | TrickFlow TFS SN-23592-3
Intake Valve dia. | 2.020
Exhaust Valve dia. | 1.600
---------------------------------------------------
test bench | SuperFlow 1020
flow test pressure | 28"
---------------------------------------------------
Intake lift | flow (cfm)
0.100 | 69
0.200 | 138
0.300 | 194
0.400 | 238
0.500 | 251
0.600 | 249
0.700 | 245
Exhaust lift | flow (cfm)
0.100 | 60
0.200 | 103
0.300 | 137
0.400 | 165
0.500 | 183
0.600 | 193
0.700 | 195
----------------------------------------------------
Here are the flow numbers for the heads, what do y'all think?
__________________________________________________ _
Cylinder Head | TrickFlow TFS SN-23592-3
Intake Valve dia. | 2.020
Exhaust Valve dia. | 1.600
---------------------------------------------------
test bench | SuperFlow 1020
flow test pressure | 28"
---------------------------------------------------
Intake lift | flow (cfm)
0.100 | 69
0.200 | 138
0.300 | 194
0.400 | 238
0.500 | 251
0.600 | 249
0.700 | 245
Exhaust lift | flow (cfm)
0.100 | 60
0.200 | 103
0.300 | 137
0.400 | 165
0.500 | 183
0.600 | 193
0.700 | 195
----------------------------------------------------
09-27-2003, 06:28 PM
#55
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Re: Help Me Build a Chevy 350 Interesting combination, as far as I/E goes.. I'd say that the heads have a good flow at .500 on the intake side. Thats really what you want considering the size of the cam you are going to be using with this combo. Its wierd that the intake port goes downward while the exhaust port continues to improve. These will outflow the double hump heads, vortec heads, lt1 heads, etc. Exhaust side flows really well, looks like they'd work in our goal of 450hp. Although there alot better heads out there, these flow well for the price Some people swear by TFS, others say they are junk. I take it these heads had most of the work done to the exhaust side?
BTW: this link is good for head flow #'s
http://www.chevyhiperformance.com/te...598/index.html
Go down to the bottom and check out the categorys for small blocks..
Exhaust side flows really well, looks like they'd work in our goal of 450hp. Although there alot better heads out there, these flow well for the price Some people swear by TFS, others say they are junk. I take it these heads had most of the work done to the exhaust side? BTW: this link is good for head flow #'s
http://www.chevyhiperformance.com/te...598/index.html
Go down to the bottom and check out the categorys for small blocks..
