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Engine - General, Exhaust & Induction Topics about the general engine items, exhaust system discussed here & Improving the intake tract - air filter to intake valve.

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Old 11-03-2012, 01:05 PM   #61
Re: a 655 after porting  
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He's got a 16 valve hybrid in a rear drive shadow, just saw the pope mention somone else breaking a cylinder and it sounds kind of like what happened to larry buford (kclarryb).
I think I met him at SDAC this year. Is this his shadow?
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Old 11-03-2012, 02:45 PM   #62
Re: a 655 after porting  
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Oh my god !

RWD ???
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Old 11-03-2012, 05:23 PM   #63
Re: a 655 after porting  
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Yep thats the guy, he had a thread somwhere cant seem to find it tho.

Its too bad we cant get somone to make us a new head casting, i was kinda bewildered when i opened up my car craft this month and found sombody making heads for some old sixtys 200 ci ford inline six, how come we cant get a break like that ?

sorry if im getting off topic guys..
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Old 11-19-2012, 10:47 PM   #64
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This is the scan I promissed on the head, been having a busy couple weeks.



a 655 after porting-scan0001.jpg
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Old 11-20-2012, 01:30 AM   #65
Re: a 655 after porting  
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Thanks Rob,

It would be nice if this graph also have stock 655 and 782 head flows to have a comparison, especially if these values are linked to the machine which has measured them.
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Old 11-20-2012, 05:04 AM   #66
Re: a 655 after porting  
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Looks good man!
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Old 11-20-2012, 08:29 AM   #67
Re: a 655 after porting  
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Thanks Rob,

It would be nice if this graph also have stock 655 and 782 head flows to have a comparison, especially if these values are linked to the machine which has measured them.
I'd have to hunt for it but I have the graphs on those here already in another thread.
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Old 09-25-2014, 12:14 AM   #68
Re: a 655 after porting  
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Thanks Rob,

It would be nice if this graph also have stock 655 and 782 head flows to have a comparison, especially if these values are linked to the machine which has measured them.
was reading something and forgot to post the 655 vs 782. The test is with a 655 with 81 valves, nasty and the 782 was with todays valves and muilti angle seats. Actually I guess they aren't muilti angle it leaves a nice radius on the seat but what ever. The 655 gives it a beating anyway.

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Old 09-25-2014, 07:49 AM   #69
Re: a 655 after porting  
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Thanks Rob,

If I understand well :
- both heads flow the same at low lift,
- exhaust flows are close between the 2 head.

You need a special ported intake to use a 655 head, can a stock 2 piece intake be used ?
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Old 09-25-2014, 09:36 AM   #70
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you can use the two piece but you need someone who does aluminum welding to add a lot of material to the bottom of the runners

if you tried to port the bottom of the intake runners to match the lower opening of the 655 port you will break through the intake as it's cast only to end up with a big hole

if you have an intake and a gasket , place the gasket against the intake & look at the point where the lowest part of the opening in the gasket is , then look at the underside of the intake - you should see the outside of the bottom of the intake is about even with the hole in the gasket - this is why you run out of material if you try to port the intake as cast to match

AND , Thanks pope for posting that graph - I've got a buddy that's been a na-sawer ever since he saw the diff in the two heads port floors
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Old 09-25-2014, 09:57 AM   #71
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Wow! did this really take 2 years to find and post this graph or is there some sort of time error on the server??

11-20-2012 09:29 AM - then - Today 1:14 AM
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Old 10-16-2014, 01:22 PM   #72
Re: a 655 after porting  
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Wow! did this really take 2 years to find and post this graph or is there some sort of time error on the server??

11-20-2012 09:29 AM - then - Today 1:14 AM
the last one was a graph from a 655 vs 782 thread from a lot longer ago. I just added it for a question I didn't see from long ago.

The graph is stock untouched 655 vs stock 782 with better valves. The 655 was a vintage 81 head with 81 valves that have a 3/32" ridge sticking up on them and only the sharp 45 degree seats. Not rounded non edged valves and seats like the new stuff on the 782. Either way though didn't mater much. The intake ported has big valves and new seats. But other than smoothing the port and removing the tiny emissions bumps on the floor there was no enlarging or reshaping of the intake port over stock. Basically sand out the edges after big valves and done, the ports are actually larger than the 44mm big valve stock. But at least your real close once you cut the seats to 44mm, big valve seats are only 41mm out of the box..
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