Moparts Main Index | READ - Info & Help Page | Moparts Sponsors | Tech Archive

Forums Calendar Active Threads Search Forum Help
Previous Thread
Next Thread
Print Thread
452 to replace 915 in a pinch? #695705
05/12/10 10:42 AM 05/12/10 10:42 AM
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2
2734bbl Offline OP
member
2734bbl  Offline OP
member
2

Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
Heres what I got:

440
steel crank
KB237
Zero deck
Stock rods w/ARP
balanced
Crane 528/552- 242@50 Hyd #H-242/3520-2-8
iron adjustables 1.5
RPM intake

My problem is I have this short block with .040 MLS and 915 heads in mind.Turns out one of the 915s is unusable.

I have a set of 452s that are fresh and ready to go.


My question is can I go with a steel shim and the 452s and maybe a little mill work and be OK as far as quench? If not do you guys have any recomendations?

3500lbs Dart post,TTIs,3200 Fairbanks vert,3.91 gears,750 DP and MSD.
Thanks!
Re: 452 to replace 915 in a pinch? [Re: 2734bbl] #695706
05/12/10 10:44 AM 05/12/10 10:44 AM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
DaytonaTurbo  Offline
Too Many Posts

Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
915 and 452 have a totally different chamber design. With a 915 you build for quench with a flat top piston, with a 452 you need a domed piston to build for quench. Your combo will run fine with the 452, it just won't have quench.
Re: 452 to replace 915 in a pinch? [Re: 2734bbl] #695707
05/12/10 11:50 AM 05/12/10 11:50 AM
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 75,005
U.S.S.A.
the open part of the chamber on a 452 will not be the same from chamber to chamber , to get quench with them and the piston you have ,of course this is ASSuMEing that your piston is at ZERO deck , you would need to cut at least .100 off the head and use a steel shim gasket . Of course cutting that much off the head will create a new set of problems, like much higher compression ratio and possible piston to valve clearance .

find another 915 or just put on the 452's and cross your fingers ...
Re: 452 to replace 915 in a pinch? [Re: JohnRR] #695708
05/12/10 12:04 PM 05/12/10 12:04 PM
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2
2734bbl Offline OP
member
2734bbl  Offline OP
member
2

Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
Yes I know the quench wont be ideal.It is zero deck.

I was considering milling to 83 CC and steel shim gasket. I'd like to keep the CR 10 to 10.5 if I can. If I have to mix my fuel a little I'm good with that.I believe the 915s would put me above that even with a .040 gasket?
Re: 452 to replace 915 in a pinch? [Re: 2734bbl] #695709
05/12/10 12:06 PM 05/12/10 12:06 PM
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 75,005
U.S.S.A.
That's too much compression for pump gas, PLAN on mixing and probably more than just a LITTLE .
Re: 452 to replace 915 in a pinch? [Re: JohnRR] #695710
05/12/10 12:14 PM 05/12/10 12:14 PM
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2
2734bbl Offline OP
member
2734bbl  Offline OP
member
2

Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
So I think 452 with no milling and steel shim be my best option.

Thanks
Re: 452 to replace 915 in a pinch? [Re: 2734bbl] #695711
05/12/10 12:27 PM 05/12/10 12:27 PM
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem Offline
master
Dodgem  Offline
master

Joined: Mar 2008
Posts: 5,746
Ontario, Canada
I would use the 452 with a .040 gasket will give you 10 to 1 roughly so on the edge for 93 with that cam.
Re: 452 to replace 915 in a pinch? [Re: Dodgem] #695712
05/12/10 07:26 PM 05/12/10 07:26 PM
Joined: Feb 2009
Posts: 1,274
Ontario.Canada
C
can.al Offline
pro stock
can.al  Offline
pro stock
C

Joined: Feb 2009
Posts: 1,274
Ontario.Canada
..i'm not a big block guy but i have been told 452's have a better water jacket design,cool better and have hardened seats....
Re: 452 to replace 915 in a pinch? [Re: can.al] #695713
05/13/10 08:26 AM 05/13/10 08:26 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
Not enough dumb comments...yet

Joined: Jan 2003
Posts: 24,562
Brookeville, Md
you'll be fine with the 452's. Many of us if not all tossed engines together with no requard for quench and they ran fine. BTW what is quench anyway? Fancy talk. put it together and lay the hammer down.

[IMG]http://i66.tinypic.com/pui5j.jpg[/IMG]
Coming soon!!!!
Re: 452 to replace 915 in a pinch? [Re: 2734bbl] #695714
05/13/10 08:55 AM 05/13/10 08:55 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
R

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
452's flow well and have hardened seats but can be crack prone but if yours are fresh/checked out you are past that. As said you'll lose your good quench (I'm a firm believer in it) and lower the CR. Might see if you can locate another 915 as recently on here there was a single for sale and there were 2 more singles in the last ~ several months or so. EDIT they were cheap as singles tend to be

Last edited by RapidRobert; 05/13/10 09:05 AM.
live every 24 hour block of time like it's your last day on earth
Re: 452 to replace 915 in a pinch? [Re: can.al] #695715
05/13/10 09:24 AM 05/13/10 09:24 AM
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 75,005
U.S.S.A.
Quote:

..i'm not a big block guy but i have been told 452's have a better water jacket design,cool better and have hardened seats....



You need to have a block that has the cooling holes to get the benifit of the revised cooling passages and I'm pretty sure not all 452's have the passages, only those that have the 5/8 hex peanut plugs.
Re: 452 to replace 915 in a pinch? [Re: Mr.Yuck] #695716
05/13/10 09:24 AM 05/13/10 09:24 AM
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 75,005
U.S.S.A.
Quote:

you'll be fine with the 452's. Many of us if not all tossed engines together with no requard for quench and they ran fine. BTW what is quench anyway? Fancy talk. put it together and lay the hammer down.




Re: 452 to replace 915 in a pinch? [Re: RapidRobert] #695717
05/13/10 09:30 AM 05/13/10 09:30 AM
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2
2734bbl Offline OP
member
2734bbl  Offline OP
member
2

Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
Well the book says 11.5 with a closed chamber heads and an .040 gasket(I assume)so thats too much for 91 octane(all we got here)and although I dont mind mixing a little I dont think I can get away with it.There is always a thicker head gasket I suppose.With the 452s it's more like 9.7.

Both sets of heads I have are 2.08/1.74 and the cam is not all that big so I dont think it will make that much difference anyway?It's gonna get driven often so do you think the extra compression is worth it?

Motor is going together one way or the other this weekend but I did find another 915 local.

Thanks for all the replies so far.

Re: 452 to replace 915 in a pinch? [Re: JohnRR] #695718
05/13/10 10:02 AM 05/13/10 10:02 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
Not enough dumb comments...yet

Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Quote:

Quote:

you'll be fine with the 452's. Many of us if not all tossed engines together with no requard for quench and they ran fine. BTW what is quench anyway? Fancy talk. put it together and lay the hammer down.







where ya been John? missed ya. really at 16-18 earlys 20's who knew any of that? He'll be fine w/ the 452's.
Re: 452 to replace 915 in a pinch? [Re: Mr.Yuck] #695719
05/13/10 10:56 AM 05/13/10 10:56 AM
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2
2734bbl Offline OP
member
2734bbl  Offline OP
member
2

Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
Quote:

Quote:

Quote:

you'll be fine with the 452's. Many of us if not all tossed engines together with no requard for quench and they ran fine. BTW what is quench anyway? Fancy talk. put it together and lay the hammer down.







where ya been John? missed ya. really at 16-18 earlys 20's who knew any of that? He'll be fine w/ the 452's.



I have indeed been down that road. I once put J heads on the 273 in my 67 Barracuda thinking I was doin a good thing.....OOPS

Moderated by  Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer 
Privacy Policy · Forum Rules · Mark All Read Contact Us · Moparts




Moparts Main Index | READ - Info & Help Page | Moparts Sponsors | Tech Archive


Powered by UBB.threads™ PHP Forum Software 7.7.1