'63 Chevy step side

[63chevystepside]

Ok its a 4 bolt bored 40 over and i think the crank is a 327or a 307---crank casting numbers i found are 3941174c-1 any one know if this is a 327or a 307 crank number? Everything iv looked at says 3941174 is a 327 or 307 but what is the c-1 at the end of the number? Can't find any 3941174c-1 but i can 3941174 an its a 327or 307. and crank was stamped with a 10 so its turned 10.

 

[63chevystepside]

Piston number on top i found was L3022 and it has 4 relief valves---are these 327 pistons?

 

[66nova]

As far as compression goes, you can NOT calculate compression ratio with a cylinder pressure test. You need to know your bore, stroke, cylinder head chamber size, and head gasket thickness. You also need to know quench. Cam timing has too much bearing on a pressure test.

As far as head gasket goes, you need to know your bore. You pick the gasket that matches that size. So, I guess a .040 over 350???

I'm guessing you have a 327 crank, but a good place to ask is

www.speedtalk.com

 

[63chevystepside]

As far as compression goes, you can NOT calculate compression ratio with a cylinder pressure test. You need to know your bore, stroke, cylinder head chamber size, and head gasket thickness. You also need to know quench. Cam timing has too much bearing on a pressure test.

As far as head gasket goes, you need to know your bore. You pick the gasket that matches that size. So, I guess a .040 over 350???

I'm guessing you have a 327 crank, but a good place to ask is

www.speedtalk.com

Yea the 180psi i was getting on that other engine is the cyclinder pressure-your right which was done by the cam-everything else i don't know other than the heads are 194-but im guessing since oreilly did it they just put everything back to stock and just did what they had to-on this other engine i was talking about i think the crank is a 307/327 the numbers being (3941140) in a 350blk the numbers being (14010207) and i notice a 10 stamped on the crank so its turned 10 and now im interested in what kinda pistons i got-they would have to be 327 pistons(40 over) the numbers on top of the piston is L3022F i can see a number by looking up through the bottom on the back of the piston 1436 with 92 underneath that number. the piston has 4 relief valves and it looks flat. Summit shows a piston with that number but it shows it as a 350 piston? The head gasket number is 1178VC. The engine is a 4 bolt---im thinking its a 350 converted over to a 327---and it had 305 heads and not the HO kind either(suck) those head numbers are 14022801 and it is the 7 bolt ehaust---it just also with this engine the "cyclinder pressure" was low like 130psi---an id think with those 305 heads it be higher?---sorry 66-i got two projects going on at the same time.---Just went and took another look at those pistons they don't have that little dot that i saw on the summit ones but they have a trangle looking spot on the ouskirt of the piston?

 

[63chevystepside]

Just realized why the "cyclinder pressure" was low-its because its a stock cam---so this engine is a 350 4 bolt block bored 40 over with flat top pistons with a 327 crank turned 10 and had 305 heads with headers an a 6500rpm performer intake-so im just going to clean it up and put it back together an put a cam i got that is 110lobe 272duration 454lift rpm range 1800 to 5500 and i wont have to change the springs or the rockers and that rpm range of the cam im going to put in will be perfect for this set up. Actually this engine is bascial a 333.

 

[63chevystepside]

How to find TDC---iv in the past have had to deal with engines that either have the wrong balancer-or wrong timing tab or stokers. Recently on a engine i went and got a brand new timing chain cover with the correct timing tab for the balancer(at least i thought at first). a bud of mine is a engineer and gave me this info which he used in hi performance engines so i thought id pass it on to those that would like to make sure they have everything where it needs to be---Take a spark plug and hollow it out then take take it and put it in the number one spark plug hole then take a grade 8 bolt long enough to touch the piston enough as it comes up and put the bolt through the hollow plug makeing sure the bolt stays "flushed" at all times then turn the balancer by hand slowly and gently to the top til the piston touches that grade 8 bolt then take a tape measure and measure from the mark of the balancer to the 0 on the timing tab(write it down) then turn the balancer the opposite direction by hand slowly til it again touches that grade 8 bolt then measure again from the balancer line to the 0 on the tab(write it down) then take those two measurements add them together then divide them by 2 and that number is from the balancer line to the tab TDC. Note:From where you took your two measurements "the inbetween" which is the shortest distance from where you took the measurements right smake in the middle is the TDC. This is how you can make sure your crank... is where its suppose to be-then put you timing chain on or dial in your cam... iv found two cases so far where with what balancer and timing tab i had "even using the right one" was one was off two degrees and the other 4 degrees-id do this method then install a double roll chain at 4 degrees retard/or for those who dial in cams dial it. Hope this helps someone

 

[63chevystepside]

You can double check this by putting a mark on the balancer when piston is at top both times then measure the shortest distance between these two marks and right in the middle of those two marks is TDC.

 

[63chevystepside]

With a proper dialed in crank and a 4 degree retard double roll chain you could get as much as 8 degrees more out of your engine---and thats enough to win a race, to be noticed when driving it, having everything exactly right and getting all you can out of what you got...

 

[63chevystepside]

I have noticed when putting on the double roll chain at 4 retard i had to move crank 2 more degrees-so with my set up when the balancer is at 6 degrees after on the timing tab the crank gear is at the spot where 4 retard is aligned up with the dot on the cam gear.

 

[63chevystepside]

The 63 is running!!! I still got to get the holly blue electric fuel pump(just got one on i had 30gph) got to get the shifter and got to get the drive shaft done-got to get the exhaust done-then it be back on the road. Iv been tinkering with the 327 doing the little things this 327 will be a quick project i got everything but a few odds and ends and just need the holly blue electric fuel pump on this one two but thought about just putting in the stock manual fuel pump and later getting the other pump to get it in and going. I will take some pics this after noon and give ya'll a look see.