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1.88 Int. valve H.P potential??? #852457 11/13/10 11:28 AM 11/13/10 11:28 AM
Joined: Dec 2007 Posts: 214 canada,NB J jb15 OP enthusiast
jb15 OP enthusiast J Joined: Dec 2007 Posts: 214 canada,NB	Building a engine for my wifes car,360ci with 1.88 Int., wondering if anyone has a Idea as to H.P I can get with this Dia. valve if ports and bowels are just cleaned up, and guides tapered some??? Don't want to build Her a total turd.. ,lol, Thanks. Jim. pic of Wifes new to her car.. 6299593-cudadoorsnew003.JPG (145 downloads)

Re: 1.88 Int. valve H.P potential??? [Re: jb15] #852458 11/13/10 11:55 AM 11/13/10 11:55 AM
Joined: Jan 2003 Posts: 6,840 The Swamp S Sixpak master
Sixpak master S Joined: Jan 2003 Posts: 6,840 The Swamp	There are a lot of low compression 340 and 360 motors in NHRA stock classes that are going well into the low 11 and beyond with those valves. How far is the valve job sunk on them now? If the valves are sitting low they're a good candidate for a 2.02; but the 1.88's will get the job done.

Re: 1.88 Int. valve H.P potential??? [Re: Sixpak] #852459 11/13/10 02:16 PM 11/13/10 02:16 PM
Joined: Jan 2003 Posts: 5,895 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,895 Florida	I'll second that. The quality of the heads and valve job are much more important than the small amount, if any, gain you'd get from slightly bigger valves. But if you do get replacement 1.88" intake valves, get stainless that have more of a "nailhead" design as opposed to the "tulip" OEM style. They flow a bit better.

Re: 1.88 Int. valve H.P potential??? [Re: Locomotion] #852460 11/13/10 02:57 PM 11/13/10 02:57 PM
Joined: Oct 2004 Posts: 1,752 detroit area M moderncylinder top fuel
moderncylinder top fuel M Joined: Oct 2004 Posts: 1,752 detroit area	ive ported heads with a 1.88 valve on a 360 with a std stroke in a 3300lb or so volare has gone 9.90's in good air,,, 10.10 or 10.0's in normal air,,, made about 600hp

Re: 1.88 Int. valve H.P potential??? [Re: moderncylinder] #852461 11/13/10 04:12 PM 11/13/10 04:12 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	6299956-DSCN2185.JPG (300 downloads)

Re: 1.88 Int. valve H.P potential??? [Re: S/ST 3040] #852462 11/13/10 04:46 PM 11/13/10 04:46 PM
Joined: Dec 2007 Posts: 214 canada,NB J jb15 OP enthusiast
jb15 OP enthusiast J Joined: Dec 2007 Posts: 214 canada,NB	thanks Guys, and thanks for the porting picture, was hoping to get around 375 to 400hp, with stock pistons,car is streetable,also going to be a very cheep build,I have a old holley strip dominator intake and 750cfm holley to throw at it along with head work,right hdr.cam, we'll see.. Jim.. 6299995-newcudapic.jpg (167 downloads)

Re: 1.88 Int. valve H.P potential??? [Re: jb15] #852463 11/13/10 05:04 PM 11/13/10 05:04 PM
Joined: Jan 2003 Posts: 5,895 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,895 Florida	If it's a mild, stock compression, streetable combo, perhaps a dual plane intake would work better providing more bottom end and midrange.

Re: 1.88 Int. valve H.P potential??? [Re: Locomotion] #852464 11/13/10 06:00 PM 11/13/10 06:00 PM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	what do those flow S/ST?

Re: 1.88 Int. valve H.P potential??? [Re: Locomotion] #852465 11/13/10 06:12 PM 11/13/10 06:12 PM
Joined: Apr 2009 Posts: 3,422 Toronto M mshred master
mshred master M Joined: Apr 2009 Posts: 3,422 Toronto	This is great info! i was wondering how much potential my 308 castings would have with home porting and the stock 1.88" intake valve. Id like to a hit a 11 in my 360 powered 3400lb car

Re: 1.88 Int. valve H.P potential??? [Re: mshred] #852466 11/13/10 08:00 PM 11/13/10 08:00 PM
Joined: Jan 2003 Posts: 5,895 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,895 Florida	Quote: This is great info! i was wondering how much potential my 308 castings would have with home porting and the stock 1.88" intake valve. Id like to a hit a 11 in my 360 powered 3400lb car It shouldn't be a problem, but it's not just the heads. It's the whole car combo. I've been 11.31 with unported OEM heads at 3,540+ lbs under IHRA Stock crate motor rules. S/ST's heads are, I bet, are on a Super Stock combo. Other 1.88 360 Stock classed cars in NHRA and IHRA have been in the high 10's with 1.88" valves.

Re: 1.88 Int. valve H.P potential??? [Re: jb15] #852467 11/13/10 08:36 PM 11/13/10 08:36 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: thanks Guys, and thanks for the porting picture, was hoping to get around 375 to 400hp, with stock pistons,car is streetable,also going to be a very cheep build,I have a old holley strip dominator intake and 750cfm holley to throw at it along with head work,right hdr.cam, we'll see.. Jim.. 375hp - maybe on the very high end with some major block / head work ( it won't be a cheap build)to address the stock piston low comp. issue. Mid to low 12's if ALL ELSE is matched correctly ( also won't be a streetable gear )and the car is a fly weight. 10,s = fantasy land! Fastest 300

Re: 1.88 Int. valve H.P potential??? [Re: Crizila] #852468 11/13/10 09:07 PM 11/13/10 09:07 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	The factory dish piston and open chamber head is a recipe for detonation

Re: 1.88 Int. valve H.P potential??? [Re: emarine01] #852469 11/13/10 09:46 PM 11/13/10 09:46 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	2.02 valves likely won't help you much if at all below about 6000. I have personally swapped out heads with 1.88 valves to 2.02's making sure to have the chamber cc's the same and no porting or gasket matching done to either set. 0 gain. Have a friend running wysota street stock and they heads must be stock type. They went from 2.02 to 1.88 and it made world of difference in coming out of the corners. Made an animal out of the car. Have won multiple track championships with it.

Re: 1.88 Int. valve H.P potential??? [Re: MoparforLife] #852470 11/13/10 09:59 PM 11/13/10 09:59 PM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	i would say stay with the 1.88 if on a budget and looking for a 375hp motor, but on my 360 i went with the 2.02, i'm putting out about 400 to 420hp i think the Chrysler engineers knew what they were doing when they had the 2.02 valves in the hot 68-71 340's. those stock NHRA cars are running wild gears, big $$$ trans, Besides the F.A.S.T 340 cars are using 2.05 in there J's to get the flow and they are making 500hp with stock intake and exhaust manifolds Last edited by ademon; 11/13/10 10:06 PM.

Re: 1.88 Int. valve H.P potential??? [Re: ademon] #852471 11/13/10 10:03 PM 11/13/10 10:03 PM
Joined: Jul 2008 Posts: 30,474 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,474 Florida STAYcation	THIS a small-block ? ...oh-tay .... But the BB head with the 1.88 intake valve ....HP potential ? ....not-so-much

Re: 1.88 Int. valve H.P potential??? [Re: dOc !] #852472 11/13/10 10:22 PM 11/13/10 10:22 PM
Joined: Aug 2003 Posts: 11,179 Atco NJ DJVCuda I Live Here
DJVCuda I Live Here Joined: Aug 2003 Posts: 11,179 Atco NJ	i get 317 at the wheels with stock heads 1.88 intakes and air injection ports in the exhaust. std bore 360 - kb 107's and a mopar 474 lift cam. thats anywhere from 365 to 380 at the crank. 9.4:1 compression

Re: 1.88 Int. valve H.P potential??? [Re: ademon] #852473 11/13/10 10:27 PM 11/13/10 10:27 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: what do those flow S/ST? I'd say on that port, probably 254 CFM @ .700" There is more in them but, require a considerable amount of work.

Re: 1.88 Int. valve H.P potential??? [Re: S/ST 3040] #852474 11/13/10 11:03 PM 11/13/10 11:03 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Ran low 11.70's and a best of 11.69 with the above mentioned heads with KB107's & 485/495 lift cam in the Duster. In my case 1.88 or 2.02 made absolutely no difference in ET or MPH.. LD340 Intake and 750 Holley. Clean it, if it's Dirty. Oil it, if it Squeaks. But: Don't fix it, if it Works!

Re: 1.88 Int. valve H.P potential??? [Re: MoparforLife] #852475 11/14/10 06:15 AM 11/14/10 06:15 AM
Joined: Aug 2004 Posts: 2,128 sweden S sshemi top fuel
sshemi top fuel S Joined: Aug 2004 Posts: 2,128 sweden	if the seats are low, sure go with the 2.02s. And if you do, flow throughout the lift will go up but probably not so much that you will notice. A stainless valve will outlast the stock ones with a million miles.

Re: 1.88 Int. valve H.P potential??? [Re: sshemi] #852476 11/14/10 08:35 AM 11/14/10 08:35 AM
Joined: Dec 2007 Posts: 214 canada,NB J jb15 OP enthusiast
jb15 OP enthusiast J Joined: Dec 2007 Posts: 214 canada,NB	So mid to high 11's in this ,79 Arrow shoud be no problem. Jim. 6301036-cuda2010oct...jpg (87 downloads)

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