Hot Rod Forum : Hotrodders Bulletin Board

Hot Rod Forum : Hotrodders Bulletin Board (http://www.hotrodders.com/forum/)
-   Engine (http://www.hotrodders.com/forum/engine/)
-   -   pontiac 350 (http://www.hotrodders.com/forum/pontiac-350-a-224637.html)

robhardy 10-03-2012 06:55 PM

pontiac 350
 
ok,
i had no idea how hard it is to find a decent pontiac engine. the '70 455 ho was fried, bought a 76 that had been freshened that ended up having cracked heads and a block that i suspect is full of porosity.
long story short, i bought a 71 350 today. completely unassembled has been sitting for a couple of years.
the details are bored .40 over, 94 heads that appear to have had a valve job te same time the block was bored.
crank is 10/10 new pistons on stock rods, new power sealed cs-641 cam and lifters all in the box, new oil pump in the box, new timing set in the box, new bearings in the box.
i have a torker ii intake and a holley (probably 750) of of the 70. i also have the 64 heads from that engine that look pretty fresh (7/16 studs and roller rockers).
from the 76 i have a brand new lunati cam 07703 (too aggressive).
i want to combine what i've got for now and keep chasing a 400 or 455.
how much gain will i see by using the 64 heads vs the 94 heads? should gain c/r and between the roller rockers (i'll check but i'm betting they are 1.65's and the big valves i think the wimpy cam would be ok).
then add the torker ii and the holley along with ram air cast headers. i know there are some assumptions but if i'm right am i making 300 hp? 375+ pounds of torque?
i'm not planning on racing and the car will probably never see anything past 90 mph no matter what i put in it.
turbo 400 and i think 342 gears.
i've been so busy trying to get a running motor that i haven't really been looking that closely at some of what i have.
thanks for any input.

LATECH 10-03-2012 07:27 PM

The 94 heads would be what you want to run. The 64 are too big chamberwise. Compression would be to low.
My 64 has the same 350 in it you are talking about. It is a 71 350 with 94 heads.Runs OK. Has 2 barrel is probably stock.
I have a 389 that I have been trying to finish, and will this winter.
Pontiac engines are out there. Just need to look in the right place. I know where there is a 68 400 4bbl, and a 73 400 4bbl both good cores from a reputable guy.
The carb you have will be too big if it is a 750. A 600 would be closer to optimum. A quadrajet on a stock pontiac 4 barrel intake is a great combo...believe it or not.
one of the comp cams XE grinds might be a good cam choice. Maybe a Lunati VooDoo. Nothing wrong with a summit cam either.
Something like a 212/218 @.050 would be plenty for a 350.Dont go too big, especially on a 350.

robhardy 10-03-2012 07:37 PM

the specs i'm finding show the 94 heads with 96 cc chambers and the 64 heads with 87 cc chambers unless i mis-read something.

LATECH 10-03-2012 07:38 PM

You should CC the heads to see just exactly what the chamber size in for both. Its the only way to really know where your compression will be at. None of the head charts I looked at are consistent, nor have they been accurate in the past, some yes and some not.
I am guessing the 94s will be smaller chambers, as the 64 are from a 455 , which usually means larger chambers due to cylinder size.

robhardy 10-03-2012 07:43 PM

i kind of figured the carb would be a little big for it.
i'm not really looking to sink a ton into this engine since i'm planning on putting a 400 or 455 in it.

robhardy 10-03-2012 07:47 PM

Quote:

Originally Posted by LATECH (Post 1595954)
You should CC the heads to see just exactly what the chamber size in for both. Its the only way to really know where your compression will be at. None of the head charts I looked at are consistent, nor have they been accurate in the past, some yes and some not.
I am guessing the 94s will be smaller chambers, as the 64 are from a 455 , which usually means larger chambers due to cylinder size.

i haven't looked at them side by side but memory of the 64 chambers vs looking at the 94 chambers i would say the 94's looked smaller. the valves are definitely smaller but i don't know if a 350 really needs the giant valves.

LATECH 10-03-2012 07:48 PM

Sounds like with what you have, you have most of what you need to build it. A cam wont be expensive, just pick the right one.
A pontiac intake and quadrajet wont break the bank, but you will need to look around to find a deal. Edelbrock performer is a good alternative intake, but i would opt for a quadrajet to put on top. Easy to work on and reliable.
CC those heads, so you can determine compression.

LATECH 10-03-2012 07:54 PM

The 350 will need the heads with smaller valves.The bore size restricts the clearance between the cylinder wall and the valve, causing valve shrouding, basically impeding flow. if you look at the top of the cylinder bore of the 350, you will see 2 notches in the top of the bore.This is a relief or "chamfer" to help airflow around the valve as it is so close to the cylider wall that it wont allow good airflow in that area without it.

LATECH 10-03-2012 08:05 PM

If the #64 heads are indeed 87 CC chambers, they would be Ideal for a 455 street motor.

robhardy 10-03-2012 08:25 PM

Quote:

Originally Posted by LATECH (Post 1595963)
If the #64 heads are indeed 87 CC chambers, they would be Ideal for a 455 street motor.

they are one year heads. 1970 455 h.o. they only went into grand prix's and gto's. rated at 365 hp in the goat and 370 in the grand prix.
the small valve issue solves that problem. i've got a 76 cast iron intake but i think mr. p-body told me it won't work on the older blocks but i'll double check that. there is cast iron intake for sale locally. i may slap an xe 256 in it and i'll definietely get a smaller carb.
my plan is to use that torker intake, the 64 head and the big carb on a 400. i'm just waiting for the right block to come along.
for now i want to drive this car while the weather is nice. that's why the 350 is going in for now.
i've had this car for a month and haven't been able to drive it.

WDCreech 10-03-2012 08:41 PM

Rob, I sent you a PM.

Bill

robhardy 10-03-2012 09:32 PM

thanks bill

robhardy 10-05-2012 02:32 PM

carb is a street avenger 670 cfm. should be fine.
my only goal for this engine is a quick 0-60. the cam is 198 on the intake 212 on the exhaust with a lift of around 440 or somewhere.
going to have the heads re-surfaced and cc'd. the only question is whether or not the torker ii will destroy the low end torque.
i have a 76 stock intake. can that be modified to fit the 71 heads?
if that's not a cheap, simple mod and the torker ii will kill the motor off the line then a performer is probably the easy fix.
that cam probably plays out well before 5000 rpm's and i'm thinking i'm not running too big of a risk off the tires not grabbing with an almost stock 350.
so, the torker ii seems mis-matched to me. being wrong about that would make me happy.

LATECH 10-05-2012 04:24 PM

Torker II wont be a good intake.Single plane open plenum chambers actually kill low end torque.
A stock intake or performer is good.
IIRC you need to run the 72-76 gaskets on the 71 and earlier heads to seal the intake at the exhaust crossover.
Wallace racing has a guide for that in the text articles. I was looking there a whil back for the same info. I have 1972 heads that I was thinking of running a 1965 intake on.
Cam should be OK.You could go a tad bigger, but the cam you listed should give good response on the street for a close to stock motor. The lift is better than stock so it should help on the low end .

LATECH 10-07-2012 10:26 AM

Use the 350 block
Use the #94 heads
Use the 10/10 crank
Use the bearings you have too
Use the 76 intake you have , just need the 72-79 intake set for it to work. Use a 1972 up gasket set for the assembly.
You also have timing set , use that
The cam you listed 198/212 @.050 is an ok choice for a close to stock setup
About the only thing I dont see is an oil pump and gasket set. That shouldnt run more than about 200 bucks . That will give you a running engine.USE A STOCK Pressure Oil pump, not high volume/high pressure.
Do you have timing cover and balancer/pulleys and engine brackets?
Is the intake a 2 barrel?


All times are GMT -6. The time now is 07:07 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.