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#1
12-27-2023, 09:32 PM
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KRE Dport head pushrod clearance
I have a set of as-cast KRE Dport heads. Do they have enough clearance in the pushrod slot to use 1.65 rockers? Thanks
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#2
12-28-2023, 04:43 AM
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It depends a whole lot on what the base circle diameter that your cam is and what the plunger height is in the lifters your running.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
12-28-2023, 08:34 AM
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Quote:
I have 2 sets of KRE dport heads on engines from SD Performance and the push-rod holes would have to be elongated to fit 1.65 rockers. You could give KRE a call and ask them about their heads. These heads usually have production numbers on them. Actually if you were to post a pic it may be obvious by the size of the push-rod hole.
__________________
68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick. Best so far 10.12@133 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
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#4
12-28-2023, 10:15 AM
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I have put 1 .65 ratio rockers on multiple sets of KRE D port heads over the years without any modifications. Never had any issues.
__________________
62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
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#5
12-28-2023, 10:36 AM
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It seems counterproductive to have a pushrod hole that wouldn't support 1.65s or more than X lift. That seems like a 101 failure to me.
So, I don't believe that it wouldn't support 1.65 rockers and more than @.469 lift. Since there may be confusion, or conflicting info here, contacting the manufacturer would be the best option. .
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#6
12-28-2023, 10:49 AM
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But Gary what length push rods are you running in all of these heads, stock 9.130”?
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#7
12-28-2023, 11:03 AM
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I did call the manufacturer and waiting for a reply. Thought I'd post here to see what other people's experiences were. Doing the math with a 1.65 rocker my lift will be .628 with the Comp cam currently in the engine.
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#8
12-28-2023, 02:28 PM
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Quote:
I wish he still posted, here!
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
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#9
12-28-2023, 06:09 PM
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Quote:
__________________
62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
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#10
12-28-2023, 08:18 PM
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Quote:
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 466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
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#11
12-28-2023, 09:28 PM
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My set would have been ok with 5/16 pushrod but I'm running 3/8 so needed a little work
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#12
12-28-2023, 09:59 PM
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Utilizes standard pushrod location for 5/16" pushrods.
Pushrod tubes are designed to accommodate 1.65 rockers without grinding on the heads. .
__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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