'63 Chevy step side

[gmctrucks]

With some nice sounding mufflers it's going to sound mean since it so short. Look what I just bought for $23.00 shipped im just going to get a GMC cap or have the whole thing covered with gray leather like my OEM one that's looking bad will see. I think it going to look good. Keep up the good work look on Ebay or craigskist.org for deals. You can even put power steering on it and A/C my cousin did back in the late 70s.

 

[63chevystepside]

Over off Shields, like beside or just behind a corner car lot? That would be Gary's Differential and that dude is high priced. He wanted $40 just to install a damn U joint in a driveshaft I was gonna carry in. I said to hell with that. I used my vise and sockets and did it myself for FREE and had it done in the amount of time it would have took me to just drive there let alone wait and drive back. Called him for something else too cuz I had a coworker that worked there and said he could get me a discount. So after I got the price, then I said, OK now how about that discount and he said that was discounted 20%. Like hell, I got it done cheaper without a discount at Agnew, the place I told you about that does good driveline work. Also call Bluementhals. They do good differential work.

Ok i will...if you need help putting the tranny in just give me a hollar.

 

[hotrodpc]

With some nice sounding mufflers it's going to sound mean since it so short. Look what I just bought for $23.00 shipped im just going to get a GMC cap or have the whole thing covered with gray leather like my OEM one that's looking bad will see. I think it going to look good. Keep up the good work look on Ebay or craigskist.org for deals. You can even put power steering on it and A/C my cousin did back in the late 70s.

That's nice JeemC. Looks like that came off one of those Medium Duty Top Kick trucks. You need to be putting that biggo honkin steering wheel on your truck. You'll be owning the road with that biggo wheel !!!

 

[63chevystepside]

Hey, Hot Rod---got a few questions about something like to have your input on. I was thinking about the 350/305 heads you said it would not flow as much air in the system at top end an the 750 holly on a 350/305 would make it lack for air two--is that right?

 

[63chevystepside]

Here is my big question and thought...stock bottom half 350(double roll chain) with a cam-110lobe-288duration-480lift rpm range 2200-6200 with stock HO 305 heads with long slot 1.5 rockers z28 springs-alu. eldrbrock or weiland intake-600 eldrbrock or 750 holly carb-hei with a weight set and super coil-16 intial timing to help it in top end-headers-hi flow 180 thermostat -electric fuel pump-electric fan-car balancer for quicker accel-maybe some kind of cold ram air kit...thought maybe that cam and timing might help with breathing at top end...tell me what you think-yes i know 350 heads would be better an vortec heads...---i got all this stuff and just need bear min. to put it togather---can it be done and hold about the 6000rpm-6500rpm and flow as much air as needed an have the compression HO 305 heads do for a 350?---if my calulations are right-this set up would give quite a bit more power from the get go to the 6000rpm.----any draw backs? 305 heads on a 350 will add about 3 to 5% horse power-sure they don't flow well at higher rpms but can't that be overcame by timing an cam and a cold ram air kit? Not sure if that 3 to 5% added horse power is per cyclinder but if so it add somewhere from 80 to 140 horse power on a 350 horse power engine. Im not a big fan of the 305/350 thing either-just wondering...i heard some guys put 350 valves in those heads and port them an they do just like a 350 but with the added compression?

 

[hotrodpc]

I'm not saying its going to starve for air. Its just physically impossible to cram that much air down the ports. It not going to starve at all, but more air means bigger explosion and more power in the combustion chamber. The ONLY advantage to 305 heads is higher compression and thats really not big of a deal when the best pump gas you can get is 91 octane. You can compesate with a big cam with valve overlap to bring the dynmaic compression ratio down and run on 87-91 octane just fine. But, just saying don't expect the big performance. Think about the purpose of a big cam, and is the 305 head really doing it justice? IMO, its the making of a motor that SOUNDS mean as hell but has no go. Then the guy next to you with a mild RV cam and a set of vortecs idling almost as smooth as can be sounding stock is gonna give you a spankin and embarass the hell outta you. Why? Becasue he is cramming more into the cylinder with better breathing heads. Head ports are always the bottleneck of air flow. This is why selecting a good head casting and maybe even work it over a bit will run much better.

 

[63chevystepside]

I'm not saying its going to starve for air. Its just physically impossible to cram that much air down the ports. It not going to starve at all, but more air means bigger explosion and more power in the combustion chamber. The ONLY advantage to 305 heads is higher compression and thats really not big of a deal when the best pump gas you can get is 91 octane. You can compesate with a big cam with valve overlap to bring the dynmaic compression ratio down and run on 87-91 octane just fine. But, just saying don't expect the big performance. Think about the purpose of a big cam, and is the 305 head really doing it justice? IMO, its the making of a motor that SOUNDS mean as hell but has no go. Then the guy next to you with a mild RV cam and a set of vortecs idling almost as smooth as can be sounding stock is gonna give you a spankin and embarass the hell outta you. Why? Becasue he is cramming more into the cylinder with better breathing heads. Head ports are always the bottleneck of air flow. This is why selecting a good head casting and maybe even work it over a bit will run much better.

ok don't want no spanking so i stay from that combo...wants the normal compression on a stock 350? Is there a way to tell by how much compression your getting what kinda of pistons you got? all things being equal...does a cam or boring raise compression?

 

[hotrodpc]

I'm not saying its going to starve for air. Its just physically impossible to cram that much air down the ports. It not going to starve at all, but more air means bigger explosion and more power in the combustion chamber. The ONLY advantage to 305 heads is higher compression and thats really not big of a deal when the best pump gas you can get is 91 octane. You can compesate with a big cam with valve overlap to bring the dynmaic compression ratio down and run on 87-91 octane just fine. But, just saying don't expect the big performance. Think about the purpose of a big cam, and is the 305 head really doing it justice? IMO, its the making of a motor that SOUNDS mean as hell but has no go. Then the guy next to you with a mild RV cam and a set of vortecs idling almost as smooth as can be sounding stock is gonna give you a spankin and embarass the hell outta you. Why? Becasue he is cramming more into the cylinder with better breathing heads. Head ports are always the bottleneck of air flow. This is why selecting a good head casting and maybe even work it over a bit will run much better.

ok don't want no spanking so i stay from that combo...wants the normal compression on a stock 350? Is there a way to tell by how much compression your getting what kinda of pistons you got? all things being equal...does a cam or boring raise compression?

The later 350's are about 8.5 or 9 to 1 compression stock. That's using a dish piston and 76cc heads. Smaller combustion chamber heads raise compression, flat tops without a dish in the piston raises compression, longer stroke raises compression, boring will raise it a tad, milling the head will raise it. There is static compression ratio which is what we talk about when we say 9 to 1 or, 10 to 1 pistons etc. That's what you mathematically have by calcutating bore x stroke, head cc volume, head gasket type or whatever. Then there is dynamic compression ratio which is our ACTUAL compression ratio. With a big cam, your intake valve isn't always fully closed when the piston starts coming up on compression stroke, so you lose all that compression til the intake valve is fully closed. So if you have a static compression ratio of 10:1, but a big cam, your actual compression ratio could be 9:1 for the lost compression. This is why if you have a high compression motor, with a big cam to compensate you can still run pump gas. I'm not the expert in explaining this stuff, so you might want to do some searches for things like dynamic compression ratio and see what you find out.

 

[63chevystepside]

I'm not saying its going to starve for air. Its just physically impossible to cram that much air down the ports. It not going to starve at all, but more air means bigger explosion and more power in the combustion chamber. The ONLY advantage to 305 heads is higher compression and thats really not big of a deal when the best pump gas you can get is 91 octane. You can compesate with a big cam with valve overlap to bring the dynmaic compression ratio down and run on 87-91 octane just fine. But, just saying don't expect the big performance. Think about the purpose of a big cam, and is the 305 head really doing it justice? IMO, its the making of a motor that SOUNDS mean as hell but has no go. Then the guy next to you with a mild RV cam and a set of vortecs idling almost as smooth as can be sounding stock is gonna give you a spankin and embarass the hell outta you. Why? Becasue he is cramming more into the cylinder with better breathing heads. Head ports are always the bottleneck of air flow. This is why selecting a good head casting and maybe even work it over a bit will run much better.

ok don't want no spanking so i stay from that combo...wants the normal compression on a stock 350? Is there a way to tell by how much compression your getting what kinda of pistons you got? all things being equal...does a cam or boring raise compression?

The later 350's are about 8.5 or 9 to 1 compression stock. That's using a dish piston and 76cc heads. Smaller combustion chamber heads raise compression, flat tops without a dish in the piston raises compression, longer stroke raises compression, boring will raise it a tad, milling the head will raise it. There is static compression ratio which is what we talk about when we say 9 to 1 or, 10 to 1 pistons etc. That's what you mathematically have by calcutating bore x stroke, head cc volume, head gasket type or whatever. Then there is dynamic compression ratio which is our ACTUAL compression ratio. With a big cam, your intake valve isn't always fully closed when the piston starts coming up on compression stroke, so you lose all that compression til the intake valve is fully closed. So if you have a static compression ratio of 10:1, but a big cam, your actual compression ratio could be 9:1 for the lost compression. This is why if you have a high compression motor, with a big cam to compensate you can still run pump gas. I'm not the expert in explaining this stuff, so you might want to do some searches for things like dynamic compression ratio and see what you find out.

Iv been searching and havent found anything that says like a 10 to 1 engine will have 180psi of compression...i checked the 63 its the one with the 305 heads and 350 block it has 140 BUT the pink truck has 180 and they both are right at 20 inch vaccum. the 63 is at 10 degrees intial and the pink one is at 16 and has a cam...guy who had this before me said he got the engine from oreillys?-i know you don't want more than 20psi per cyclinder...just wondering whats up the 350 is all 350 in the pink truck and the 63 is 80-86 and the pink is a 74---what kinda of compression would a 10 to 1 have?

 

[63chevystepside]

ok i got out my chilton book and a 1974 350 will have 8.5:1 and a 150psi-ok that being said my 63 is closer to 8:1 even with the 305 head set up on a 350---must be lower compression pistions like that engine in that truck you bought from me. The pink one is like 180psi so that tells me its deck must of been done and heads milled and or since it was rebuilt they had to of bored it at least 30 over??? Whatever they did its at a 180psi vs stock was 150psi...it makes the block a 290hp engine instead of the 160hp engine---then adding in all my mods-its a stout 350.