DEBATE: Which heads are better?....Chevy 350, Pontiac 350, Olds 350 or Plymouth 350. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-29-2005, 10:40 PM
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DEBATE: Which heads are better?....Chevy 350, Pontiac 350, Olds 350 or Plymouth 350.

I was just wondering who thinks what about these heads. Id like to find out the design advantages/disadvantages of each and find out there flaws. Lets have some fun here.sorry im bored.tv stinks right now.

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Old 11-29-2005, 10:43 PM
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unless you talk about the LS engine series, for factory heads, hands down, Olds 5A, case closed.
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Old 11-29-2005, 11:43 PM
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You should edit that, Plymouth 340.

68
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Old 11-29-2005, 11:49 PM
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Probably depends on what block you're going to try to bolt them onto.
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Old 11-30-2005, 03:12 PM
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Quote:
Originally Posted by 68Velle
You should edit that, Plymouth 340.

68
SORRY....But Chrysler also had a 350 CI engine in late 50s
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Old 11-30-2005, 03:15 PM
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you didnt mention Buick 350.
depends on best for what... torque, horse power, velocity, highest flow, best stock, best ported, availability, how universal, used on normally aspirated , or blown applications, also to say 350 Chevy..or whatever...kind of depends on what 350. a 70 350 LT-1...or an 82 350 smog truck engine.
way to many variables to answer
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Old 11-30-2005, 04:13 PM
How fast is fast enough?
 
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Buick 350 heads make the best boat anchors.
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Old 11-30-2005, 04:28 PM
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Just as a tough, should this include Ford 351 heads also...Not that I would choose them as the best, but this is the "350 or close to" engine ford created and I would personnaly include them myself in this thread for comparison purpose...
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Old 11-30-2005, 04:56 PM
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pontiacs in my opinion

im not an expert at well... anything, but in my opinion i think pontiac is the best for a few reasons,

1, you can put up to 2.11 n 1.77 valves in it, but if you want to go this route, its actually cheaper to run a 400-455 head. they slap right on and everything interchanges basically.

2, pontiac (pre 77) are the only heads that i know of that have stock machined combustion chambers. now i may be wrong, let me know if i am.

3, they can be ported to flow more than 250 cfm.

just my opinion about the whole deal.

rock on!
B

Last edited by h0trod389; 11-30-2005 at 07:49 PM.
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Old 11-30-2005, 06:24 PM
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I don't want to mention any names or get derogatory, but I know this little blond__________________

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Old 12-01-2005, 09:18 AM
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Quote:
Originally Posted by h0trod389
im not an expert at well... anything, but in my opinion i think pontiac is the best for a few reasons,

1, you can put up to 2.11 n 1.77 valves in it, but if you want to go this route, its actually cheaper to run a 400-455 head. they slap right on and everything interchanges basically.

2, pontiac (pre 77) are the only heads that i know of that have stock machined combustion chambers. now i may be wrong, let me know if i am.

3, they can be ported to flow more than 250 cfm.

just my opinion about the whole deal.

rock on!
B
Pontiac combustion chambers have a poor burn characteristic causing them to require a lot of timing advance.

tom
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Old 12-01-2005, 09:19 AM
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Quote:
Originally Posted by stepside454
SORRY....But Chrysler also had a 350 CI engine in late 50s
Chrysler made a 350 in 1958. Hardly a common engine.

tom
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Old 12-01-2005, 12:36 PM
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Best bone stock iron heads are 1970-91 AMC 360/401 heads, followed by Chrysler Magnum series heads in the 90s-now (the 318 and 360 EFI engines, which may have been discontinued over the last couple years??). Nice big ports and valves, and the contour of the ports was very well done. The AMC heads are roughly equivalent to later Chevy LS-1 heads right from the factory, and flow great numbers with just a minor clean-up. Chrysler bought AMC in 1987 and created the Magnum heads shortly after based on the AMC port design.

It's the SHAPE of the port for any head more than the size. The best example I can think of is the AMC six cylinder (well, I am an AMC fan...). Late 1960s (65-68) heads have the biggest ports but don't flow real well because they go in then make almost a 90 degree turn over the valve. When the 4.0L came out in 1987 AMC redesigned the ports and combustion chamber -- actually the whole head (though bolt pattern remained the same -- a 2000 head will bolt to a 65 block). The intake ports on the 4.0L head are just about half the size of a 65 head, but flow MUCH better! The intake ports were mainly raised about 1/4" and made smaller to improve the bend radius. That increased velocity and made the head flow much better than the old huge ports with the 90 degree bend. In 1991 the ports were raised another 1/8" for an even better turn radius. This added 10-13 hp with no other changes. There was a slight change in the cam and computer programming also (for emissions reasons), but that didn't have much impact on power. There was a 13 hp gain with the head, cam, and computer change total.

The point is shape means more than size.
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Old 12-03-2005, 03:47 PM
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Quote:
Originally Posted by 68Velle
You should edit that, Plymouth 340.

68
Chrylser did make a 350 B engine.... then "bored" it to 361.

But I think 340 or 360 LA engine would be appropriate.
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Old 12-27-2006, 04:00 AM
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i dont think that question could best be answered unless one knew things like intended use ,bore/stroke /camspecs/compression ratio/rod length/vehicle weight/gears/rpm/fuel octane.
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