Re: 2.15 int. Valve too big for 318 @30 over?
[Re: roadrunninMark]
#2622725
02/17/19 10:59 PM
02/17/19 10:59 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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I Live Here
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Kalispell Mt.
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your about 323 CID, a 5.7 hemi is 345 so not a big difference in CID, there are bone stock 5.7s with well over 300 CFM from the factory so no that is not too much flow. It will however be hard to get that big of valve and flow in a 318 wedge head configuration, the valve will need shifted towards the bore centerline to get that big of a valve in there, a 2.02 barely works on a stock bore 318, a .030 over bore gives you an extra .015 clearance meaning a .030 bigger valve for a grand total of 2.05 valve size... to fit a 2.15 you would need to move the valve about .050. If you do that you will have to put a very small exhaust valve in or move it over also further shrouding that one. I don't think ex flow is all that important but you do eventually get to a point where you just got to much coming in and not enough out. Also if you got to moving valves around and that big of a valve your KB167 has a valve releif that will not clear the valves anymore. Bottom line is that in order to get that big a valve in it you will have to spend a mountain of money for little to no gain, so possible? Yes. Reasonable? No. If you really want that much flow a mild W2 rework will easily do that with a 2.02 valve. If you want it to drive similar to the 5.7 hemi get as high of a rocker ratio as you can to straighten out the PR angle as much as possible and run a short duration fast lifting cam and proper timing events and it should be very streetable. Those new hemis have giant sewer pipe size ports and crazy flow numbers but can be super tame fun to drive every day engines.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: roadrunninMark]
#2622739
02/17/19 11:30 PM
02/17/19 11:30 PM
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Joined: Oct 2011
Posts: 3,036 bean town ....Ca
WHITEDART
master
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master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
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I read before that a 318 can have valve interference with the cylinder wall if the valve is too large? My 318 has been bored 30 over and I wanted to know if a 2.15 intake valve would be too big. Also, is a 300 cfm flow too much for a street engine? The engine has the kb167s in plus a 274 retro roller cam. I want a nice street engine so I want some low end power, not the top end. I ran 2.14 intakes on a 4.030 408cid... you are still under 4 in with a 318 I would measure twice to be sure
In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: roadrunninMark]
#2622742
02/17/19 11:38 PM
02/17/19 11:38 PM
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Joined: Jan 2003
Posts: 14,492 So. Burlington, Vt.
fast68plymouth
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I want a nice street engine so I want some low end power, not the top end. Then you don’t want 2.15 intake valves, or any heads that size valve would be suitable for. Heads for good low end street power on a 318 would be like EQ magnum heads, and use the 1.92 intake valve.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: roadrunninMark]
#2622790
02/18/19 01:28 AM
02/18/19 01:28 AM
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Joined: Jan 2003
Posts: 11,706 Portage,michigan
B3422W5
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They ARE too much for your intentions. ( the heads)With very little convertor( a big key to a “ racy” 318) and 3.55 gears sounds like you are just kinda looking for a street cruiser with some punch. The kind of heads Fast68 above mentioned are a good way to go I say all this as a guy who raced a 3400 pound pump gas 30 over 318 that ran mid 11’s with iron heads. Pretty trick little piece .That took a 5,000 convertor
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: roadrunninMark]
#2622802
02/18/19 01:56 AM
02/18/19 01:56 AM
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Joined: Feb 2005
Posts: 20,154 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,154
PA.
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The heads are a pair of Edelbrock race heads, should be 58cc chambers.
Victor heads or race prepped standard Edelbrock heads. Just wondering because it sure as heck doesn't take a 2.15 valve to flow 300 cfm. A 2.05 valve is plenty.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: roadrunninMark]
#2623038
02/18/19 07:48 PM
02/18/19 07:48 PM
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Joined: Feb 2005
Posts: 20,154 PA.
pittsburghracer
"Little"John
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"Little"John
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PA.
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Man you are going WAY over-kill with the Edelbrock Victor heads. Don't get me wrong I want a set BAD but I gotta wait till I need new pistons because those heads require them. My Friend got his small block ProMax heads from Jegs so it may be worth calling them. I also talked to the owner of ProMaxx a couple of years ago but I have to many Edelbrock heads on my shelf now. Not sure I would run that Victor head on a 318 but that choice is yours.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: roadrunninMark]
#2623368
02/19/19 03:59 PM
02/19/19 03:59 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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I Live Here
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Kalispell Mt.
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How about the big mouth Hughes head or get Pittsburgh to do a set like that?
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: HotRodDave]
#2623373
02/19/19 04:11 PM
02/19/19 04:11 PM
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Joined: Feb 2005
Posts: 20,154 PA.
pittsburghracer
"Little"John
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"Little"John
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Posts: 20,154
PA.
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How about the big mouth Hughes head or get Pittsburgh to do a set like that? Lol. Come on now in never even finished a set for myself yet. One of these days I’ll get back on that project
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: roadrunninMark]
#2623392
02/19/19 05:30 PM
02/19/19 05:30 PM
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Joined: Feb 2006
Posts: 604 TN
1DGEMAN
mopar
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mopar
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TN
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Not to hijack the thread, but on the subject of after market heads. what are guys doing for pre 72 340s with positive deck pistons? Most of the heads I see have closed chambers and the pistons would not clear. I thought a nice aluminum head that flows well would be better than working over one of my sets of X heads.
Real Men shift for themselves
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: BcudaChris]
#2623408
02/19/19 06:57 PM
02/19/19 06:57 PM
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Joined: Feb 2005
Posts: 20,154 PA.
pittsburghracer
"Little"John
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"Little"John
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Doesn't Edelbrock offer a specific head for those 340's? Seems like I've seen one on Summitt. Yes they do. That's what is on my Son's 360 that runs low 10's. I picked up a damaged set on Moparts years ago for 450.00 and fixed them and then ported them.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: 1DGEMAN]
#2623446
02/19/19 08:53 PM
02/19/19 08:53 PM
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Joined: Jun 2018
Posts: 350 Mequon, WI
gzig5
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Mequon, WI
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Not to hijack the thread, but on the subject of after market heads. what are guys doing for pre 72 340s with positive deck pistons? Most of the heads I see have closed chambers and the pistons would not clear. I thought a nice aluminum head that flows well would be better than working over one of my sets of X heads. I'm pretty sure that is the difference on the ProMAXX 63 and 65 CC heads. The 65 have a little more room for the positive height pistons. I think the Edelbrock do the same, hence the 340 version?
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Re: 2.15 int. Valve too big for 318 @30 over?
[Re: gzig5]
#2623712
02/20/19 02:46 PM
02/20/19 02:46 PM
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Joined: Feb 2006
Posts: 604 TN
1DGEMAN
mopar
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mopar
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Posts: 604
TN
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I'm pretty sure that is the difference on the ProMAXX 63 and 65 CC heads. The 65 have a little more room for the positive height pistons. I think the Edelbrock do the same, hence the 340 version? [/quote]
So the 65cc heads are an open chamber design to clear the piston. The only pics i could find of them looked like closed chambers but maybe that was a generic pic?
Real Men shift for themselves
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