[77 TRASHCAN]

I'll be measuring the 17's, ASAP, it'll be a while, my burrette, and stand are at my dad's shop, an hour away.

[77 TRASHCAN]

LOL, I just read on Wallace Racing, they list the 68, as 8.6:1. 265 HP, maybe low comp 2Bbl to run on low octane (regular) gas???

I wouldn't think a 67 350 would be lower comp and a 70 350. My motor book lists the 68 350 as 9.2:1...Time will tell...

[g-body_vet]

Originally Posted by 77 TRASHCAN

I currently have a 350 Pontiac in my car. It would be a good choice to do what you are doing. As mentioned above, you will need ALL the motor mount stuff, and all the brackets, because the 305 is a Chevrolet, and a different trans. The motor mount parts might be the biggest challange...but you will need that stuff for the 455, when that day comes.

Also, as mentioned above, pull the intake, valley pan, and oil pan. Seal it back up, if it's worthy.

Bret, are the 46's the old 350 H.O. heads??? What are the 94's???

The 305 can go in the river.....
.

I have all of my parts collected to swap a pontiac mill. I'm going with 301 mounts from a GP to make it a seamless deal. Trans will be a 200-4R. I've had a few people try to discourage me from using it but I WANT THAT OD! I do a lot of expressway driving and a 3 speed won't cut it, especially since we have the highest gas prices in the nation. I know it needs to be built to withstand any amount of torque and that will be addressed when the time comes. I've already priced parts and looked into it's weaknesses. I already have all the linkage from a Monte SS too. I have a posi carrier & 3.23's waiting to be installed as well.

I know a lot of the guys on here build their cars for track time too. My car will never see a drag strip. I'm not worried about making my car hook, launch, or ever run low 11's.

I have a buyer for the 305 and he's giving me more than what I'll pay for the 350! Otherwise I'd be finding a boat owner to give it to.

[77 TRASHCAN]

g-bod,
I was wondering if you know what year 350 you are buying??? I am assuming that 68-69 350's only have the 2 motor mount bolt holes in the block (Assuming, because I don't know for sure). Your motor mount set up would need the 70 and up 5 bolt block...Jujst a thought....

[g-body_vet]

Originally Posted by 77 TRASHCAN

g-bod,
I was wondering if you know what year 350 you are buying??? I am assuming that 68-69 350's only have the 2 motor mount bolt holes in the block (Assuming, because I don't know for sure). Your motor mount set up would need the 70 and up 5 bolt block...Jujst a thought....

It's a '71 Block with 94 heads. He also has a '73 with 46's. I picked the '71 and he's throwing in a non-egr 4bbl intake, extra Q-jet and an HEI.

[g-body_vet]

No luck on finding that intake. I'll just use the one from my 455 since I'm going to run it as is.

[hurryinhoosier62]

I hate to disillusion some of you guys, but I owned a '76 Grand Prix with a 350 Pontiac/TH400/2.92:1. It was a 2-barrel motor that consistantly delivered 19-21mpg.
I was in my early 20's back then(1985),so that engine was flogged regularly. It NEVER
let me down. It was sold to a neighbor when I bought my '72GP. He was still driving it
10yrs later!

[77 TRASHCAN]

No knocks on 350's from me. I just want to wake mine up a little, on a budget. I've heard of many Pontiac 350's that ran great.

g-body,
Don't be afraid of an EGR intake on the 350, especially a 77 or 78.

[g-body_vet]

I talked to the guy today and the '71 350 had water in one of the cylinders

At least he had the decency to call before I made the trip on Thurs.

He has a few others that he's going check for me. No big deal. If worst comes to worst I'll just go full speed ahead on the 455 like I had planned anyway.

[70temp455]

I'd say "Yeah" if I could get mine running again. I put on a 4bbl and HEI and it aint right !
Andy

[77 TRASHCAN]

Originally Posted by g-body_vet

I talked to the guy today and the '71 350 had water in one of the cylinders

At least he had the decency to call before I made the trip on Thurs.

He has a few others that he's going check for me. No big deal. If worst comes to worst I'll just go full speed ahead on the 455 like I had planned anyway.

What about the other 350 he had???, It wouldn't be much different....

A 400 would be nice...

[g-body_vet]

Originally Posted by 77 TRASHCAN

What about the other 350 he had???, It wouldn't be much different....

A 400 would be nice...

He doesn't want to let any of the 400's go very cheap. Yeah I could probably find one if I looked, but I have a good rapport going with this guy and he's willing to take partial trades for scrap metal on a 350. He's into demo derby stuff and yanks all the BOP engines when they build a car....which equates to a trailer full of engines. I'm dropping my block off at his buddy's machine shop tomorrow and hopefully I'll get a chance to see exactly what he has up there.

[77 TRASHCAN]

Originally Posted by Donovan

Let us know what you find out... I believe you'll find that these heads are over 80cc

Well..., as Johnny Carson would say...correcto mundo there Pontiac breath.....

The most original 17 head of the two (one had been worked on w/ a 45 degree intake seat...) I searchd out the best valve w/ the most margin, and the best seat (all looked VERY good)

83.5 cc's for the 17 head. That puts the comp ratio @ about 8.25:1...yee ha. I have a feeling this 17 head is the same as the 11 heads on my 350 now...

[Donovan]

good deal thanks for the note

[77 TRASHCAN]

Another note...
One of my Pontiac fellow enthusiast's told me, and I read the same in Jim Hand's book, that essentially ALL 67 and up "D" port heads have the same port shape/volume. Jim Hand says they are all around 153 cc's. Just for curiosity I measured the same port that I cc'd the chamber on. it was 150.5 cc's. The difference in most of those heads is the chambers and valve size. The deeper chambers changes the port alignment.

I have a 77 (from my car) and a 78 400. I might re-work the 17's, install 2.11 and 1.77 valves in them, give them a Jim Hand port job, and use them on a 400 (maybe) I'll have to evaluate the 400's first.

I think that the small valve (my opinion) 350's from 68-70 and all about the same chamber size as I measured, then in 71 the chambers got way bigger to knock the comp ratio down to 7.6:1 My motor book lists the 68 and 69 small valve 350's as 9.2:1.
Not knowing the deck height of a stock 350, it could even be less. I'm guessing at 8.25:1 w/ the 8.35 cc chambers using Jim Hand's compression ratio guide for the popular Pontiac engines on page 74 of his book. I found a head/compression ratio chart @ Wallace Racing, they list the 68 350's as 8.6:1, crap at least they are closer that my Motor Book.

One thing that Jim Hands tells you in his book, is to check every head for it's chamber volume, never to take it for granted...Thanks again Jim Hand!!!

One good thing I did uncover, I cc'd a chamber on a 6X-4 head, it came in @ 93 cc's. I was glad about that one, I've heard that some -4's can be quite a bit more...