valleyguy

After years of searching for another F-body I have finally found what I was looking for...anyway one to the question...its an 86 with a 5 speed, the motor is suppose to be an allen armstrong 350 (he builds some crazy engines) and it has a holly 4BBL double pumper. Problem is I live in a small town here and there isnt a mechanic around here that would touch carb let alone be old enough to even know what one looks like haha. I have very little carb no how other than what i have read in magazine's, so whats a guy to do in the tunning department?? As of now it kinda runs like crap...decent when your crusin but if you stand on it it just starts breaking down but if you ease on the gas its fine but I can't tell if the secondaries are even opening...also is there a number on the carb I can get to tell what cfm it is?? any help would be muchly appreciated.

1FastZ

post the number on the carb and more than likely I can look up the number in my book.

valleyguy

Thanks I'll get the number off it tomorrow...worked late tonight then had to put an alternator on the daily, so I'm done for the night haha

Air_Adam

You're looking for the 4 digit number (sometimes followed by a dash and another number) on the choke horn.

valleyguy

Thanks...glad you said that cause who knows what numbers I might have come up with haha

sofakingdom

iTrader: (1)

valleyguy

sorry it took so long but I have those numbers now...
List-4776-2
1587

those where all the numbers I found and in that exact way. thanks for the help guys this forum is so much more helpful than others I've been on.

Codename 47

iTrader: (4)

That's a 600 cfm Double Pumper.

valleyguy

sweet thanks...at least now I have something to start with.

Air_Adam

4776 = 600cfm double pumper, 4150 body style (4160 is vacuum secondary).

Codename 47

iTrader: (4)

It's also possible that carb may be too small for the motor. Maybe post up some more specs on your fuel system and motor specs too. Lets see what we can do for you.

I would make sure the jets, squirters and cams are all stock. Tune from there. When you give it gas, make sure you see gas squirting into both the primaries and secondaries. You may also need to check into your fuel delivery; you may need a better fuel pump ect.

spears_107

I have a 750 cfm double pumper carb, would that be too big for a H.O. 350?

1FastZ

nope
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Here is a link you may want to check out.

http://www.holley.com/

1FastZ

thats what I came up with also

Air_Adam

Find out first for certain if its a 305 or 350... a 600cfm would be just right for a 305, and would work nicely on a mildish 350 too. A 750 DP would be too much for any 305, and too much for alot of 350s as well.

When it comes to carbs - when in doubt, go with the smaller one. The smaller one will give better driveability and steet manners.

valleyguy

I wish I could tell you guys stuff about the motor but unfourtunetly I know nothing about it. I was (told) it was an allen armstrong motor, and around here that is a big bonus, he even builds some race motors that are shipped to him from the state's. As far as specs go I'm thinking it's not much more than 30 bore and a little refresh (the guy told me 300 horse at the crank but I higly doubt it) and maybe (maybe) a little better cam, it doesnt have a lumpy idle tho but it could just be a very mild cam. Im trying to get ahold of the orignal owner so I can get some info on the motor. I spent almost 3 hours cleaning and detailing it and decided to take a better look at the carb....and its filthy inside lots of crap on it. I think over the winter I'll pull it off and give it a cleaning and a rebuild (well not me but you get the idea) then go from there. Also do holly's make any noise? Cause not hearing the (4bbl) noise is what got me wondering. again I really apreciate all the help you guy's are great.

valleyguy

Is there an easy way to see the numbers on the back of the block? cause I just spent like 20 mins with my womans compact thing trying to get it down there far enough but still couldn't haha the heater core lines are only a little in the way but there is a bunch of wires in the split loom that are really in the way....any one know some tricks? haha

Codename 47

iTrader: (4)

Yeah it's a pain in the ***.
The key is to remove all the excess stuff, like heat and windshield wiper motors etc (sarcasm). Who needs heat?

As for your previous post. First things first, ID the block. Lets find out if its a 350 or 305. Then pop off the valve covers and get the casting numbers on the heads. We can find out some more about what you've got going on there. That's a good start, granted you still wont know what type of pistons you've got or what cam you're running. If someone told you it's 300 hp, it's probably just a 350 with stock heads and a mild cam. Did you say it had an aftermarket intake? Good luck.
-Greg

valleyguy

I didnt say but it does have a wiend (sp?) intake on it, oh and a stupid cold air intake thing of a chevy truck...chrome tube with a filter on it, but no worries Im on the look out for a nice open element cleaner.

Codename 47

iTrader: (4)

Cool. "Weiand". Does this car have headers and a catback exhaust?

valleyguy

yes it has all new piping front to back (headers are old) and a vortex muffler (some sort of chambered muffler)

89RsPower!

heater core shouldnt be in the way if you're looking for the casting number, the # is on the drivers side, heater core is on the pass side..

valleyguy

Haha no wonder I couldn't find it I feel smart haha. are the head casting numbers on both heads or just one?

SpitotRs305

head casting numbers are on both heads... normally between the center rocker arms

valleyguy

sweet I actually went out and bought an extendable mirror so I could see the casting on the block and now I can check the haed numbers at the same time. thanks

valleyguy

Okay I got all the numbers I could see and I was on that mortec site and none of my numbers are on there? Now the engine one its possible I messed that one up, but the ones on the head I know are right cause I double checked them after I wrote them down...Ill post up the numbers and see if you guys can help me out cause Im lost.

block...3670100, I think the six might be a nine now that i think about it but it still didn't show up.
Heads...64..which I assume is the cc...8782461...then under it B274 and GM6 was in the middle of the head. thats all I can come up with...Im gonna go see if i messed up the block one after my back recovers haha

valleyguy

Haha Block is 3970010...Im pretty sure but mortec lis 3 engines with that number??

Codename 47

iTrader: (4)

That's a 350. It went into multiple different vehicles. The thing you'd want to find out is whether it's a two or four bolt main. Four bolts are stronger, but for this application it doesn't really matter.

I can't seem to find anything on those heads.
B274 would be the date casting. I think that means Feb 2nd 1974.

valleyguy

Maybe I did mess up on the heads but Im almost positive thats what they are...give me a sec and Ill pull the cover of again...takes like 10 seconds....just has those wing things on it you take off with you hand...I don't really care for them but what can you do

Codename 47

iTrader: (4)

I'm pretty sure the head casting is "3"782461. According to Mortec that's a camel hump head.

valleyguy

haha yea there was a bit of oil on the 3 and it looked like an 8 lol oh well at least now I know haha thanks for all the info and help. So if I go looking for parts for this motor what years could I use? or are they pretty much all the same...ie starters,alternators,and belts and stuff like that

Codename 47

iTrader: (4)

Pretty much all the same. What do you need to buy?

valleyguy

nothing really rite now but next summer when its outa storage Im gonna put new belts on it and change the oil...just little things like that

Codename 47

iTrader: (4)

Yeup. Just run some 10W30, and a standard small block oil filter which the parts store will be able to supply you with. As for belts, you may just want to take off the ones that are on there now, take them in and get ones that are the same (size). I would assume they are just v belts.

valleyguy

sweet thanks man...by the way I added you to my msn..hope you dont mind

Codename 47

iTrader: (4)

That's cool. But I've got to study for some Physics here. Shoot me a PM or an IM if you've got more questions and I'll try to help. Good luck.

valleyguy

thanks