I did my exaust ports like yours, but didnt get as extreme on push rod pinch or valve guide on intakes. I am freshening up a stock 318, nothing fancy, will have long tube headers and 4 bbl, but stock cam at least for now. It will be in a 4:10 geared 77 w200 with 33's automatic. I guess looking for more efficency and power than I currently have.
@@black_sheep_fab9411 update, this weekend I unshrouded the valves, they look better. I did make a flow ball. Then I looked at my roller cam block I wanted to use and saw the block is cracked at upper cyl head bolt hole between #3 . I guess this is common with later 318 blocks. cracked pretty deep. But I have a 75 block with a mild cam I can use. The roller block cyls and pistons looked better than other 318.
Erg runners I don't worry about that much. I find they don't affect flow that much. I have filled them with aluminum before but unless ur in a max effort kind of thing I don't feel they are even worth addressing.
I always heard these early 90s heads off 318s were sought after... but I don't see why after seeing this... I've got some myself that need worked over but looks like alot of trouble for lil bit of power when new aluminum heads are everywhere ... just my thoughts.....
The combustion chamber looks much more modern, a lot like a GM Vortec style. Idk How much that helps overall power, but it's probably good for high compression on 87 octane.
From what I experience u just need volume in that area so taking it completely out is far more beneficial than shaping it. I shaped the first few I did until I got a flow bench and realized how big of a problem that area is
I've heard the biggest valves you want to go in a 318 is 1.91 chevys in the intake. At least I think they were 91
I was always blown away by how bad the pushrod pinch is on a SBM.
And I thought the big blocks were terrible. Yikes !
I did my exaust ports like yours, but didnt get as extreme on push rod pinch or valve guide on intakes. I am freshening up a stock 318, nothing fancy, will have long tube headers and 4 bbl, but stock cam at least for now. It will be in a 4:10 geared 77 w200 with 33's automatic. I guess looking for more efficency and power than I currently have.
Ya the pinch isn't too big of an issue until you get it opened up down around the short side and bowl. Then it will start to be the restriction
@@black_sheep_fab9411 update, this weekend I unshrouded the valves, they look better. I did make a flow ball. Then I looked at my roller cam block I wanted to use and saw the block is cracked at upper cyl head bolt hole between #3 . I guess this is common with later 318 blocks. cracked pretty deep. But I have a 75 block with a mild cam I can use. The roller block cyls and pistons looked better than other 318.
Nice work.👍
Great video. What is your solution for the egr runner on the exhaust valve? Do you grind the intake valve guide all the way down even ?
Erg runners I don't worry about that much. I find they don't affect flow that much. I have filled them with aluminum before but unless ur in a max effort kind of thing I don't feel they are even worth addressing.
I always heard these early 90s heads off 318s were sought after... but I don't see why after seeing this... I've got some myself that need worked over but looks like alot of trouble for lil bit of power when new aluminum heads are everywhere ... just my thoughts.....
I won't argue that. Lol
The biggest gain as a bolt on would be the compression boost in my opinion. After that, they need a ton of work to fully utilize
Where's the fun in that? I've learned a lot porting out my 714s.
The combustion chamber looks much more modern, a lot like a GM Vortec style. Idk How much that helps overall power, but it's probably good for high compression on 87 octane.
Does anyone know if these heads were used on the Final carbureted engines (88-89 Fifth Avenue) or were these just used with EFI engines in trucks?
Can't say with certainty but I'd say there is a good chance.
👍💪
Does taking away the tail behind the intake valve boss help? I feel like it should be a blade like the LS3 heads added
From what I experience u just need volume in that area so taking it completely out is far more beneficial than shaping it. I shaped the first few I did until I got a flow bench and realized how big of a problem that area is
@black_sheep_fab LS3 heads flow ~300 cfm on the intake so I like their design methodology, which is shoot air straight into the cylinder, no swirl
@@archivegarage7638 ya that would be fine if you had a head that was designed with enough csa to incorporate the wing. These don't have it.
@@black_sheep_fab9411 How did you like that 360 with 318 heads?
@@archivegarage7638 runs really good for how mild of a combo it is. Gave it a good compression bump as well as the improved flow.
Excellent job....
Thank you