foney_email

I am replacing the engine in my t/a with another 350. The problem is that the heads on that running motor are crap 75 cc heads.

cast # 3998991

Should I even use these, or should I get a new set. Money is kinda an issue. The heads from my old engine are having some issues. Whoever built that engine, decided to put two different heads on it. Anyway, could I use these heads for a core exchange, or maybe try to trade them for a set of 305 heads?

five7kid

iTrader: (14)

List them on eBay under "Marine, Anchor"...

If you find someone who has a clue, they're going to laugh at an exchange. If you find someone who doesn't, are you going to want to get heads from them?

It shouldn't be too difficult to find a set of 305 heads.

thebigwelsh

I got a set of 882 heads you can have for cheap. only 60k miles on em. Or ya can trade me somehting i need for my 350 swap and well call it even.......

aim=headsinner
thebigwelsh@yahoo.com

1987formula

find some 993 heads they flow good there also a thicker casting and less prone to cracking.If you have them mildly ported there a great head to run and all your assceories will bolt right up.

ljnowell

993 heads??? Yuck.

F-BIRD'88

What are the "two different heads" that are on your old motor?

You may have two different heads with different casting numbers, but functionally they could be essentually the same. May not be as big of an issue as you think.

foney_email

The passenger's side reads :
3927188
E2201 GM 53

The driver's side reads:
3947041
ka s GM 8

F-BIRD'88

Yaousa! Well the "188" head is a low perf 307 2bbl327 head. about 74cc chambers

The 041 head is a late camel back type with hi perf 64cc chambers.

I would see if I could locate a matching casting to the 041 head and use them on the 350. If you look on Mortec.com you'll find many suitable castings that are the same or simular.
Any of the "hi perf" "fuelie" "LT1" "Z/28" 64cc castings from the late 60's to 1971 will do. Like 040, 186, 492, 370, 414 etc.
They are functionally, the same.
Many machine shops have these laying around and will sell you the odd head from a broken set, at reasonable prices.
have them renewed with new 2.02x 1.60 valves, new springs and guide relineing with a nice multi angle valve job. Mild/ moderate hand porting will wake them up for street performance.

foney_email

Do you guys think that these heads would be better than what I have?

Jay

five7kid

iTrader: (14)

1 of your current heads - no better.
1 of your current heads - worse

thebigwelsh

SHHHHHHHH i wanna get rid of these damn things, they are just laying around my shop, and i need a radiator and a driveshaft damnit!

five7kid

iTrader: (14)

It is possible that a set of 882's may produce a better overall effect vs. a mismatched pair of heads. On the other hand, the loss of even more compression and relatively poor flow would make them a very poor choice with performance in mind.

At the risk of repeating myself: It shouldn't be too difficult to find a set of 305 heads. Non-swirls, of course...

foney_email

I spent 2 hours at the scrap yards yesterday. I found 2 small block 400's, several 350's, and a few 2.8's. One of the heads had 80cc chambers. and every other one had 76cc chambers. There were some 2.02's but one of the heads was cracked.

One pickup with the 400 had a 4 speed, tall mr gasket valve covers, edelbrock intake, and a 4 barrel rochester. Oh yeah accel super coil. I love finding old auto's that had performance in mind. Of course non of the things I found were any use to me.

The point is, I found no 305 heads. I have another scrap yard guy around here, that is willing to look for me. It is too hard to look now. 9 to 5 sucks. The yards are closed weekends.

I will go out of town this weekend though. What casting for 305 heads do you guys suggest.

Jay

five7kid

iTrader: (14)

For perimeter bolt covers ('86-earlier), 416 or 601. If you're willing to deal with the different bolt angles of the centerbolts, 081.

Huffs_91_RS

If you have $500 the vortecs are not that bad. They use a different intake to. All together you would be lookin at $650.

twisselman1968

I ave two sets of 305 heads that are 53cc chambers but there perimeter bolt valve covers and standard intake bolt angle of course if you don't mind that I'de get rid one of the sets real cheap probaly $35 plus shiping ??? and I've also got a set of 350 heads that are 60cc chamber if you want a little less comp. , both sets of 305 heads came of good running motors but puffed smoke when you started them...tipacle chevy but if your interested just email me at Twisselman1968@hotmail.com

foney_email

You've got mail

TexasB4C

iTrader: (1)

I have a 92 350 TPI with 305 centerbolt heads on it and have been told that the 305 heads are really limiting my potential, ive been told i need to get 350 heads, but i thought they were the same?

am I right, whats the difference i know some have different valve sizes but are the intake and exhaust ports the same, and arent 305 heads good because of the higher compression ratio?

i have a pair of 305 heads ported and polished and al that good stuff sitting around but they are early 80's perimeter valve cover bolt , will they bolt on to my 350 with TPI intake

thanks for any help

five7kid

iTrader: (14)

305 TPI heads will have about the same port volumes as 350 TPI heads, but smaller intake valves and smaller chambers.

Ported with 1.94" intake valves, the only difference will be the chamber size.

F-BIRD'88

which 305 heads do you have? swirl port heads will limit the performance potential. other non swirl port heads have lots of potential (as good or better than 083 350 heads) once you've ported them and installed larger valves.

What are the casting numbers on your heads?

TexasB4C

iTrader: (1)

the casting number is 14014416
i have 1.94 intakes and 1.5 exhausts
i havent cc'd the combustion chambers yet but will get around to it
i didnt look at the heads that are on it yet but they are supposed to be stock 92 305 TPI heads, so i guess ill go with my other ones that are prepped already ill just have to get new valve covers for them
are there any fitment concerns i should worry about with the TPI intake and SLP headers

thanks for the help so far

F-BIRD'88

You may have to enlongate the 4 center manifold bolt holes in the TPI intake manifold and put some washers under those 4
bolts . The center bolt holes ar at a different angle on most TPI manifolds and heads. the 416 heads have all the intake bolts at the same angle.
The old style pre 86 valve covers may not clear the air conditioning pump brackets.

TexasB4C

iTrader: (1)

could i use "short" valve covers to clear the a/c bracket
ive seen short and tall pre 86 valve covers in summit
thats why im askin lol
so the 416 heads wont just bolt up to the TPI intake