Posted By: 70satelliteguy
Anyone using 7/16 pushrods??? - 02/11/11 01:49 AM
Did you have to clearance your block to accomodate these? I am using a MP Mega block.
Thanks Mike
Thanks Mike
Anyone using 7/16 pushrods???
Posted By: AndyF
Re: Anyone using 7/16 pushrods??? - 02/11/11 02:01 AM
Shouldn't have to clearance the block but you'll most likely need to whittle on the heads a bit.
Posted By: 70satelliteguy
Re: Anyone using 7/16 pushrods??? - 02/11/11 02:04 AM
Thanks Andy, how about clearance problems with solid body Comp roller lifters ?
Mike
Mike
Posted By: Cab_Burge
Re: Anyone using 7/16 pushrods??? - 02/11/11 03:00 AM
Quote:I switched my 527 bracket motor to Manton 7/16 ball and cup from 3/8 ball and ball(switch heads and rockers) I had to trim the 440-1 heads with the 7/16 pushrods, didn't need to with the 3/8 pushrods on the SR heads
Thanks Andy, how about clearance problems with solid body Comp roller lifters ?
Mike
Put them in and check for rubbing 
Both sets of rockers,T&D and Harland Sharps are 1.65 ratio so that does play a part in the pushrods rubbing 
Posted By: MR_P_BODY
Re: Anyone using 7/16 pushrods??? - 02/11/11 03:19 AM
I didnt have to touch the block for 7/16 tapered
PRs but had to remove a ton of material from my B-1M/Cs
PRs but had to remove a ton of material from my B-1M/Cs
Posted By: 70satelliteguy
Re: Anyone using 7/16 pushrods??? - 02/11/11 06:33 PM
Thanks for the replys.
Mr. P body, what block are you using and are the tapered 7/16 pushrods ones just as strong ?. I have never seen any of those.
Thanks Mike
Mr. P body, what block are you using and are the tapered 7/16 pushrods ones just as strong ?. I have never seen any of those.
Thanks Mike
Posted By: Monte_Smith
Re: Anyone using 7/16 pushrods??? - 02/11/11 11:19 PM
Although you can make 7/16 pushrods work on INDY heads, it gets tight and takes lots of grinding. Unless you are just running insane spring pressure, usually a set of 3/8 pushrods with a .120 wall will do the trick.
Monte
Monte
Posted By: CompWedgeEngines
Re: Anyone using 7/16 pushrods??? - 02/11/11 11:21 PM
How much open and closed spring pressure do you plan on running ?
What is the intended useage of this engine?
What is the intended useage of this engine?
Posted By: MR_P_BODY
Re: Anyone using 7/16 pushrods??? - 02/12/11 02:41 AM
Quote:
Thanks for the replys.
Mr. P body, what block are you using and are the tapered 7/16 pushrods ones just as strong ?. I have never seen any of those.
Thanks Mike
I sold all my B-1m/c stuff along with the mega block
but I was going to use the 7/16 tapered instead of 3/8"
straight because of high spring pressures(around 1000
or more open) but I clearanced the heads for them
Posted By: Cudahlr
Re: Anyone using 7/16 pushrods??? - 02/12/11 03:35 AM
The bigger the pushrod, the better! Steve Morris, told me that he runs 9/16" pushrods in most of his larger engines. He said that he gained 43 hp from switching from 1/2" to 9/16" on his engine.
Posted By: moparacer
Re: Anyone using 7/16 pushrods??? - 02/12/11 03:48 AM
I have 7/16 in mine with a low deck and Indy heads.
I think the only place I ran into problems was the end of the heads #1 #2 #7 #8 exhaust.
Had to clearance them a bit.
I think the only place I ran into problems was the end of the heads #1 #2 #7 #8 exhaust.
Had to clearance them a bit.
Posted By: DemonDust
Re: Anyone using 7/16 pushrods??? - 02/12/11 03:56 AM
Running 7/16 in my R5 no clearancing required. Totally different animal as well....
Posted By: Cab_Burge
Re: Anyone using 7/16 pushrods??? - 02/12/11 04:46 AM
Quote:Mike, I'm not Mr Pbody but here is a picture of a 7/16 single tapered pushrod on the right, straight 7 1/6 in the middle and a 3/8 on the left side(looking down at them
Thanks for the replys.
Mr. P body, what block are you using and are the tapered 7/16 pushrods ones just as strong ?. I have never seen any of those.
Thanks Mike
) I tried using 8 7/16 single tapered to avoid trimming the heads on the intake sides, it didn't work 
The 440-1 heads use a offset intake rocker and I didn't want to change the intake rollers to offsets so I tried the single tapered pushrods instead, that didn't work either 
I ended up using them on the exhaust sides and used the straight .095 wall x 7/16 diameter on the intakes 
BTW, the single tapered I ordered are .167 wall on the straight 7/16 part and end up being .120 at the 3/8 tapered ends IHTHs 
Posted By: joshking440
Re: Anyone using 7/16 pushrods??? - 02/12/11 06:33 AM
I run 3/8 intake 7/16 exhaust stock block and b1 heads. But like mr body said, had to remove tons of material from the heads
Posted By: 572stealth
Re: Anyone using 7/16 pushrods??? - 02/12/11 11:57 AM
any real world gains by switching to thicker/larger pushrods? I have .080 wall 3/8 and was thinking of going to .135 wall 3/8. B1MC heads with 350 seat and 920 open.
Posted By: 70satelliteguy
Re: Anyone using 7/16 pushrods??? - 02/12/11 02:35 PM
Thanks all for the reply's and for the pictures CAB !
I am changing roller cams on my 572 with the 572-13 heads. The spring pressures I am changing to are right with Mr. P body's are at 1000. I had been using 3/8 .080 pushrods with my other cam( 800 +) pressure but Chuck at Best Machine suggested going with the better springs and pushrods. He also suggested the tapered pushrods should help if I run into problems with the head clearance.
Thanks Mike
I am changing roller cams on my 572 with the 572-13 heads. The spring pressures I am changing to are right with Mr. P body's are at 1000. I had been using 3/8 .080 pushrods with my other cam( 800 +) pressure but Chuck at Best Machine suggested going with the better springs and pushrods. He also suggested the tapered pushrods should help if I run into problems with the head clearance.
Thanks Mike
Posted By: dvw
Re: Anyone using 7/16 pushrods??? - 02/13/11 04:21 PM
I just mocked up my mega block which previously had 3/8" pushrods. There were slight witness marks at the very top of the inner lifter valley. My 7/16" tapered pushrods fit. Though they were very close. A little grinding was all that was needed. The heads needed a little also. I have -1s
Doug
Doug
Posted By: Cab_Burge
Re: Anyone using 7/16 pushrods??? - 02/13/11 05:42 PM
Quote:I switch pushrods on the dyno my bracket motor when it had the SR heads and T&D rockers arms on it. I had a set of Smith Bros 3/8x.083 that they custom made for the motor(I wanted thicker but they insisted that .083 was more than enough for 275 lbs and 680 lbs opened
any real world gains by switching to thicker/larger pushrods? I have .080 wall 3/8 and was thinking of going to .135 wall 3/8. B1MC heads with 350 seat and 920 open.
One of them broke in the middle during a dyno pull 
) that I ended up replacing (after I fixed the motor) during another dyno session. I switch from the .083x3/8 Smiths to a set of .120 wallx3/8 diameter sereis 3 Mantons with no other changes, the motor made 8 HP more and the peak HP RPM went up 300 RPM 
I know there is more HP and valve train benifits in better pushrods than most people think BTW, you might want to try a set of 7/16 x.095 if they will fit
Posted By: Steve Barton
Re: Anyone using 7/16 pushrods??? - 02/14/11 07:43 AM
Just wondering if any one has used the Comp Hi Teck push rods. I'm building an R3, Indy heads 360-2 with a bullet cam 700 valve lift. heads and cam cam from ryanj ?