![]() |
|
Sponsored Links | |||
Advertisement
|
|
|
||||
Quote:
Since port flow is limited they do respond to more cam duration but are pretty insensitve to lifts beyond .4 inch. The 191 head is the low compression version of these heads. This comes from direct experience can't speak for what you've heard. Unless you're building a low RPM grunt motor for a working truck these are not going to get you much performance. They are highly resistant to porting techniques, it would be useful to reduce the swirl vane but there isn't much meat in the casting, you get into the coolant jackets long before the vane is usefully reduced. If you're looking for high RPMs and better horsepower that comes at those RPMs then you need to look for different heads. I put them up for sale on Ebay or Craig's List or see if you can trade them to a shop for a set of L31 Vortecs or other modern head. The L31's are a bolt on 30-50 horsepower over any older head, the power range depending on cam thus the range. And that's out of the box without any porting. These can be found inexpensivly as rebuilt as well as new and there are many aftermarket copies in aluminum or iron many of which use conventional intake bolts as well as the unique Vortec bolt pattern. The Swirl Port heads also have a unique bolt pattern the angle of the bolts at the plenum was changed from meeting the head at a 90 degree to a 70 degree angle. If you end up using these any manifold you buy need to have that accommodation or include a modification kit, something to watch for. The larger chambered (76cc versus 64cc of the 193 head) need to be used with a flat top piston to get the compression up. Bogie |
The Following User Says Thank You to BogiesAnnex1 For This Useful Post: | ||
EragonSuperH (10-08-2015) |
|
||||
They are a great cylinder head for what they were designed for which was a truck.. If your towing or hauling, their off idle torque is perfect.. If your drag racing, they are scrap iron..
I had a 1995 k1500 and it was about as perfect as a truck engine as it could be, and it was a 305. |
|
|
|
|||||
We used them on a dished piston 350 we installed in my nephews 51 bus Coupe, along with a built Powerglide, a 2500 RPM stall converter, and 4.88:1 Positraction in a 56 housing/axles. I was "told" they came off a 305 "Vortec". The car is a sort of "street gasser". I've heard the same, "they're only good to 4500 RPM", but they were handy at the time with only 14K, take off miles on them. The engine will rev easily to 6000 RPM without hesitation, and pulls solid all the way. I'm NOT saying they're a great head, but they're not as bad as a lot of guys say they are. I've also heard that removing the "ramp" from them does absolutely nothing to improve on their performance. I think for low end torque, use in a light car, used with low gearing, or for use in a truck, they're fine. junior stocker
|
|
||||
Quote:
The Vortec 305 L30 was rated at [email protected]/285 lb/ft [email protected] The truck TBI 350;s were rated at 200-210hp and 300 lb/ft torque, so those Vortec 305 heads aren't that bad comparatively. The L30 Vortec 305 heads with have the 059 or 520 last 3 digits of the casting number. peace Hog |
|
|||||
Quote:
|
|
|||||
Quote:
|
|
|||||
Quote:
|
The Following User Says Thank You to jokerZ71 For This Useful Post: | ||
AutoGear (10-09-2015) |
|
|||||
Quote:
|
|
|||||
Quote:
|
|
|||||
Those #'s look about rite.They also are your best clue as to why they get a bad name as far as performance.The flow hits a wall after .450 lift.Without port work,there is no improvement.What ever gets made,has to be made by 4500 rpm,maybe slightly more with a bigger cam. 330 HP...Maybe...in a perfect world with a perfect setup,but,i doubt it. 414 ft/lb of torque...I don't think so.
|
|
|||||
Quote:
![]() |
|
Tags |
350, 5000 rpm, good or bad, swirl port heads, tbi |
Recent Engine posts with photos |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
cam for swirl port heads build | kottunmewth | Hotrodding Basics | 20 | 07-25-2014 10:54 PM |
spark plugs- carb with swirl port heads | red82c10 | Engine | 1 | 02-23-2012 11:02 AM |
Swirl port heads? | Plaintoast | Engine | 1 | 02-03-2009 03:16 PM |
Swirl port heads | junior stocker | Engine | 3 | 04-28-2007 04:14 PM |
TBI Swirl Port Heads | 1BDMNTY | Engine | 2 | 06-17-2003 09:52 PM |