440 with 915 heads? Going for quench - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer 440 with 915 heads? Going for quench

Print Thread

440 with 915 heads? Going for quench #1205931 03/29/12 06:10 PM 03/29/12 06:10 PM
Joined: Oct 2011 Posts: 460 Oklahoma V VoodooCLD OP mopar
VoodooCLD OP mopar V Joined: Oct 2011 Posts: 460 Oklahoma	So i'm about to build a 440. I have a 69 block with steel crank, and a brand new set of .060 over trw 2355 pistons. I've read that the pistons are about .020 in the hole if the deck isn't cut. Everyone says to deck the block to get a zero deck piston, but whats the point? Why wouldn't i just get a steel .020 head gasket (compressed thickness) and get my optimum .040 quench that way while running 915 head? are these set ups basically the same? any pros, cons? If i did run this set up, do you think i'd be able to run on pump gas? They are iron heads, and i believe the pistons would give it a compression ratio in the tens with the 915 heads. any help/experience would be great

Re: 440 with 915 heads? Going for quench [Re: VoodooCLD] #1205932 03/29/12 07:49 PM 03/29/12 07:49 PM
Joined: Aug 2009 Posts: 113 utah J jjl member
jjl member J Joined: Aug 2009 Posts: 113 utah	The deck probably won't be square,and easy way to find piston to deck height is to install 1 piston and rod assembly in each corner and see what needs to be milled.So you gain two things zero deck and square.Chamber size will vary,the last set I did with 2.14 1.81 valves and milled was 77.cc. formally orangemonster

Re: 440 with 915 heads? Going for quench [Re: jjl] #1205933 03/29/12 08:17 PM 03/29/12 08:17 PM
Joined: Oct 2011 Posts: 460 Oklahoma V VoodooCLD OP mopar
VoodooCLD OP mopar V Joined: Oct 2011 Posts: 460 Oklahoma	Ok that makes sense. Do you think i can get away running that high compression with iron heads on pump gas?

Re: 440 with 915 heads? Going for quench [Re: VoodooCLD] #1205934 03/29/12 09:34 PM 03/29/12 09:34 PM
Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada R RUNCHARGER I Live Here
RUNCHARGER I Live Here R Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada	I vote to mock it up. If indeed those pistons will sit .020 to .030 in the hole there's no need to spend money decking the block and dealing with all the intake fitment issues that may cause. I ran some 915's on a 440 with Ross pistons at -.030 and it ran like a bear on pump gas with a .528 mechanical cam. Sheldon

Re: 440 with 915 heads? Going for quench [Re: VoodooCLD] #1205935 03/29/12 09:45 PM 03/29/12 09:45 PM
Joined: Aug 2003 Posts: 43,190 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,190 Bend,OR USA	What is that piston, flat top with no valve reliefs, six pak piston with four valve reliefs or the high compression piston with the small dome? If they are the small dome high compression pistons be very careful on how much compression the motor will have with the iron heads I have built a lot of stock stroke 440 motors with iron heads, both open and close chamber heads, 9.6 to 1 is the most I'll use on the compression ratio for a pump gas motor BTW, 500 HP and 540 + ft. lbs torque is not hard to make with a stock stroke, 9.5 to 1 comp. ratio iron headed 440 Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: 440 with 915 heads? Going for quench [Re: Cab_Burge] #1205936 03/29/12 10:05 PM 03/29/12 10:05 PM
Joined: Jan 2007 Posts: 401 Ohio, USA Dr-Dave2 mopar
Dr-Dave2 mopar Joined: Jan 2007 Posts: 401 Ohio, USA	L2355F is Flat top 4 valve relief 6 pac replacement piston

Re: 440 with 915 heads? Going for quench [Re: VoodooCLD] #1205937 03/29/12 10:56 PM 03/29/12 10:56 PM
Joined: Feb 2005 Posts: 4,314 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,314 Prospect, PA	You'll probably be above 10.5 and will likely not run on pump gas unless you have a very large cam, IMO. My 10.3 CR 440 with 915 was not even close with pump gas, but the cam was fairly small.

Re: 440 with 915 heads? Going for quench [Re: BSB67] #1205938 03/29/12 11:07 PM 03/29/12 11:07 PM
Joined: Nov 2005 Posts: 1,943 San Angelo, Texas, U.S.A. 1968RR top fuel
1968RR top fuel Joined: Nov 2005 Posts: 1,943 San Angelo, Texas, U.S.A.	In my opinion, the whole pump-gas question depends on the cam duration. I run a 440 with Indy SRs (72 cc chambers) and the Keith Black forged flat tops (two valve reliefs) on pump gas with no problem. Of course, I also run Comp's XE295HL cam, and that helps. Are the chamber sizes of the two versions of the 915s different? If so, which version do you have? "When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson

Re: 440 with 915 heads? Going for quench [Re: VoodooCLD] #1205939 03/30/12 10:47 AM 03/30/12 10:47 AM
Joined: Oct 2007 Posts: 735 New York R/T1968R/T super stock
R/T1968R/T super stock Joined: Oct 2007 Posts: 735 New York	I have run that exact combo many times. I found those pistons to be between .022-.025 in the hole. with a .020 steel shim gasket your looking at about 10.3 Static compression. The important thing is your Dynamic compression. If you can keep it low enough (8.0) with quench it should be ok. camshaft selection is important. Try this calculator http://www.projectpontiac.com/ppsite15/compression-ratio-calculator Last edited by R/T1968R/T; 03/30/12 10:50 AM.

Re: 440 with 915 heads? Going for quench [Re: 1968RR] #1205940 03/30/12 10:56 AM 03/30/12 10:56 AM
Joined: Jan 2003 Posts: 75,017 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,017 U.S.S.A.	Quote: In my opinion, the whole pump-gas question depends on the cam duration. I run a 440 with Indy SRs (72 cc chambers) and the Keith Black forged flat tops (two valve reliefs) on pump gas with no problem. Of course, I also run Comp's XE295HL cam, and that helps. Are the chamber sizes of the two versions of the 915s different? If so, which version do you have? ppppssssstttt , Indy SR's are ALUMINIUM , of course you can run it on pump gas . 915's all have the same chamber size.

Re: 440 with 915 heads? Going for quench [Re: VoodooCLD] #1205941 03/30/12 11:01 AM 03/30/12 11:01 AM
Joined: Jan 2003 Posts: 75,017 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,017 U.S.S.A.	Quote: So i'm about to build a 440. I have a 69 block with steel crank, and a brand new set of .060 over trw 2355 pistons. I've read that the pistons are about .020 in the hole if the deck isn't cut. Everyone says to deck the block to get a zero deck piston, but whats the point? Why wouldn't i just get a steel .020 head gasket (compressed thickness) and get my optimum .040 quench that way while running 915 head? are these set ups basically the same? any pros, cons? If i did run this set up, do you think i'd be able to run on pump gas? They are iron heads, and i believe the pistons would give it a compression ratio in the tens with the 915 heads. any help/experience would be great Ok , now that I have that out of the way .... What is the chamber CC of the heads? You need to know that. You don't need to zero deck the pistons, but it would be a very good idea to at least have the block squared, cut the least amount to accomplish that. Does the block need to go .060 ? The bigger the bore the higher the compression is going to be. Once you have the specs and figure out the compression you can contact someone like board member fast68plymouth or Dan at Performance Only to spec you a cam for your combo that will help you build a pump gas engine with what you have ... assuming it's not 11.0 ...

Re: 440 with 915 heads? Going for quench [Re: JohnRR] #1205942 03/30/12 11:07 AM 03/30/12 11:07 AM
Joined: Nov 2011 Posts: 2,154 Its a TRAP! DARTH V8Я Oh No!! I just had a moron attack!
DARTH V8Я Oh No!! I just had a moron attack! Joined: Nov 2011 Posts: 2,154 Its a TRAP!	And for chits and giggles, cc more then one chamber. You'll be like wtf is going on here So open up the other chambers to match the largest one. But yah at the very least square the block, however much that takes off. Then after cc'ing the heads, you can choose gaskets, etc..

Re: 440 with 915 heads? Going for quench [Re: JohnRR] #1205943 03/30/12 11:58 AM 03/30/12 11:58 AM
Joined: Nov 2005 Posts: 1,943 San Angelo, Texas, U.S.A. 1968RR top fuel
1968RR top fuel Joined: Nov 2005 Posts: 1,943 San Angelo, Texas, U.S.A.	Quote: Quote: In my opinion, the whole pump-gas question depends on the cam duration. I run a 440 with Indy SRs (72 cc chambers) and the Keith Black forged flat tops (two valve reliefs) on pump gas with no problem. Of course, I also run Comp's XE295HL cam, and that helps. Are the chamber sizes of the two versions of the 915s different? If so, which version do you have? ppppssssstttt , Indy SR's are ALUMINIUM , of course you can run it on pump gas . 915's all have the same chamber size. Agreed, but I you would think that the difference in chamber sizes between the 915s and SRs (about 6 or 7 cc) should more than compensate for any differences in thermal expansion. And even though most SRs are aluminum (including mine), Indy did offer iron SR sets (at least for a while). "When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson

Re: 440 with 915 heads? Going for quench [Re: 1968RR] #1205944 03/31/12 01:32 PM 03/31/12 01:32 PM
Joined: Oct 2011 Posts: 460 Oklahoma V VoodooCLD OP mopar
VoodooCLD OP mopar V Joined: Oct 2011 Posts: 460 Oklahoma	I bought a bunch of parts off a guy, and got those brand new pistons with it. I have a 69 block thats .030 over with some surface rust on the cylinders. I also have a 74 block thats standard. I think i'm just gonna drop them both off, and have them try to use the 69 block first (its in worse shape with quite a bit of rust) and if i have to, have them use the 74 block. I'm pretty sure the 915 heads have the smaller exhaust valve. Although its weird becuase i have the old valves (they are the bigger valve, but don't sit as flush as the proper intake valve) and i also have brand new 2.14 intake and 1.81 exhaust. I would have to have the heads worked to get the new valves to fit. I have a set of 906's that are pretty ready to run as well as some 452 with slighty burnt exhaust valves. Think i'll probably just build the short block, run the 906 heads. Then sell the 915's, and pick up some aluminum heads down the road.

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1