Thread: Early 308 head thread
19-11-2014, 06:27 PM #46
19-11-2014, 06:30 PM #47
Lookin good Pete.!
19-11-2014, 06:41 PM #48
Fair mismatch there...epoxy an option?
19-11-2014, 07:04 PM #49
19-11-2014, 07:04 PM #50
epoxy is a much cheaper and quicker option, its a time factor thing, i can epoxy this and grind it out without having to set it all up and mark out again, if i tig it i will have to mill it afterwoods and mark it out again which will take hours, with the epoxy i can fill it then grind and finish mill
Last edited by HPE PETE; 19-11-2014 at 07:09 PM.
19-11-2014, 11:02 PM #51
20-11-2014, 09:08 AM #52
i have decided to weld the intake, due to the fact that its out on nearly all planes i would have to epoxy one side then let it set, them epoxy the roof and let it set then epoxy the other side and let it set before i can grind it
20-11-2014, 09:12 AM #53
- Join Date
- Oct 2008
Almost be cost effective to start with a new manifold. Shame that one has been attacked.
20-11-2014, 09:43 AM #54
20-11-2014, 02:55 PM #55
- Join Date
- Aug 2010
20-11-2014, 03:44 PM #56
Nice thread Pete!!
Hope I'm not sullying it too much with these pics. But my questions never make sense without pics.
I've been doing a set of black heads, that I think the intakes are done on except for hitting the roof.
My thinking is that you need to slow the air as it gets to the ssr so it stays on the wall of the turn. I've got a bunch of measurements for the csa as the port progresses, my min is approx 7.5mm before the ssr at 1.68 sq in and at the ssr its about 1.8 sq in.
With the measurements here would you raise the roof more around the short turn than the rest of the port? Or is the taper through the port along the lines of right as is?
My plan is to go about 50 thou into the roof. But dunno whether to keep it constant or try to get my min csa further back towards the entry?
They're for a 308, comp cams solid roller 242/248 @ 50 with valve lift of approx 620.
And heres my shabby work so far.
Any words of wisdom are much appreciated mate. Thanks.
20-11-2014, 04:01 PM #57
With those gains from the ferrea valve, what are the difference between the angles on the valves? What do you consider the best angles to have on a valve?
20-11-2014, 06:17 PM #58
Mate those heads are looking good, SSR looks good in fact the whole port looks good..........to be honest dont get too hung up on your port dimensions on a early head just make them big enough to flow the numbers that means grind anywhere you can to acheive the results, i havent measured cross sections on either of these heads, being a 355's they are never going to end up too big as the casting is the limiting factor
i took a port mould of my heads this morning and when you look at it it really looks small but the casting wont allow any more
in the case of the valves the ferrea valve has a flatter head compared to the other valve we tested
Last edited by HPE PETE; 20-11-2014 at 06:20 PM.
20-11-2014, 06:27 PM #59
more testing today on our 2nd set of heads
with some revisions we have surpassed our goal of 500hp potential @ .600 lift, we have lost a couple of cfm down low but this is partially due to the fact i took some of the top cut of the seat when i flattened the chamber, some of this may come back when the seats are final cut
Last edited by HPE PETE; 20-11-2014 at 06:29 PM.
20-11-2014, 06:34 PM #60
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- Jul 2010
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