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Buddies buildin a 383

Deuling

Deuling

“I like to make things”
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Like the title says.
He bought the 383 block from summit ready to go (very nice looking block)
Then he got the eagle rotating assy with pistons and everything and felpro blue gaskets.
305 heads all rebuilt.
Gonna get a MSD dizzy and the edelbrock performer manifold for the tbi setup.
ARP engine bolt kit
Comp Cam (cant remember which but biggest cam for his tbi setup that comp said to use)
Moroso 7qt deep oil pan with moroso high volume pump and pickup. (the $120 pump)

Going in his GMC 3/4ton. 14sf rear 6 lug.

Only pic Ive got is this one next to mine at the sand dunes.


All thats left now is to put the flywheel on and get the manifold and valve covers and such. Not going in for a bit, we are gonna take the front clip off, and then sand and repaint the whole truck the same color. Gonna build a strong 700r4 to put behind it.
Just thought i would log the pics and such here for later.
So far at this point hes only got $2600 into it so not a bad deal for a nice motor and I think a good way to do it.


Sorry for the crappy cell phone pics

383.jpg


Yes I know fram oil filter. I tried to talk him out of it but couldnt, very stubborn and i cant tell him what to do to his own motor. Just a filter anyways, oh well lol.

3832.jpg


3833.jpg
 
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A 383 can be a good dependable engine.Why would he want a 305 head though?With a flat top piston if that's what he has his compression will be high and being a iron head isn't gonna help with that.The small valves don't help with power either.
 
From what ive heard alot of 305 heads had bigger valves than the 350s and thats why.
 
Deuling said:
From what ive heard alot of 305 heads had bigger valves than the 350s and thats why.
Click to expand...

Valve size should be the same. They're probably 1.94s. The do have a smaller chambers. Raising compression.
 
plyr2k said:
Valve size should be the same. They're probably 1.94s. The do have a smaller chambers. Raising compression.
Click to expand...

Yah not quite sure on the subject. Oh well he plans to put some alluminum ported heads on eventually, as do I, we shall see who gets there first:D
 
Did he buy the rotating assembly balanced?

Sounds like a good build. From what I know about the 305 heads, they don't flow well, smaller valves in some and some had 1.94/1.5s, they had smaller combustion chambers.
they will prob be fine with a mild cam and tbi set up.

Those look like 305 tbi heads.... And haven't dealt with them, but should be ok. Maybe same as 350 tbi heads

Also, how did you guys come up with compression ratio? Because with a flat top and small.chambers I'm thinking higher than 9:1

Just curious and willing to assist if needed.

Get a casting number from heads before you button it up. Just want to compare a tbi 305 to a tbi 350 heads for future reference.
 
I think he just got the ratio from the piston specs... Idk ill have to ask him and ill get the casting # off the heads for you.

And it says the rotating assembly is all balanced...:dunno:
Now that i look it may be 9.7:1 from the eagle stuff. Ill ask him later
 
Cool no worries,

I'm curious cuz the last one I did with flat tops and tbi heads mathematically came out to 10.34:1 after all true measurements.
 
63chevyll said:
Cool no worries,

I'm curious cuz the last one I did with flat tops and tbi heads mathematically came out to 10.34:1 after all true measurements.
Click to expand...

Yah it may be a bit higer, if so he will need to get his tbi adjusted possibly I guess. If this motor goes well it will determine whether my next engine ( down the road ) will be a nice 383 or a BBC. Cuz a 383 for $2600 befor intake and such is a darn good deal
 
I think those intakes only got up to 1.84 on the 305's, making them pretty small for a 383...it should have 2.02 or 2.05's. looks like it's a 6K rpm engine so those heads will starve it for air....low end torque should be great though.
 
76zimmer said:
I think those intakes only got up to 1.84 on the 305's, making them pretty small for a 383...it should have 2.02 or 2.05's. looks like it's a 6K rpm engine so those heads will starve it for air....low end torque should be great though.
Click to expand...

I didnt quite understand the idea from the start but oh well lol. It will just leave plenty of room for improvement with bigger heads. I wish he woulda gone roller motor though.
 
Yeah, a 383 with the larger stroke raises the compression considerably over the same piston for a 350. I have 18cc dish pistons and 64 cc chambers and my compression is 9.8:1 in my regal. Those 305 heads just seam way out of place. definitely the bottle neck in his engine, and potentially damaging compression if he really has flat tops and small chambers.
 
Don't spend all that money on a motor and still used the worst oil filter on the face of the earth!!!
 
You should really use a compression calculator to figure it out rather than going by whAt eagle tells you. You need to take several other things into account, including the deck height (I believe summit machines the deck surface on those blocks). With iron heads and that setup the compression may be high enough to where you need to run octane boosters or way retard the timing to keep it from pinging. Just my .02. Cool build though
 
Cool build. I'm not quite sure what he has in mind for this engine, but its not going to have any top end. A couple of guys I know put 305 heads on their 350's, but they are in jeeps. They build great power quick, but sign off soon. Should be interesting to see how a 383 handles it. :popcorn:
 
63chevyll said:
then tell him you wont help him fix it when the filter clogs and hurts a bearing.
Click to expand...

Ill just laugh and say I told ya so:D

But if my 408 on Royal Purple and Wix filters doesnt last as long as his ima be pissed lol
 
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