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#1
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3/8" pushrods with Edelbrock round port heads
Are any of you using 3/8" pushrods with the E heads, and did you have to grind out the pushrod holes in the heads for clearance?
Cam is a solid roller, .625" lift with 1.50 roller rockers I'm not against using 3/8" tapered to 5/16" at the rocker end if anyone has used these? Thanks. |
#2
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Taff
I'm actually using a 1/2" pushrods for my WP. I center the 1/2" drill to the pushrod hole and drilled it to a bigger 5/8" hole in my mill. I'm using a 1.6 TD rocker shafts. This is for my boosted 482. |
#3
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wow, i got into the intake port using 7/16 p/rods
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#4
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I do have a wide port eheads so maybe it don't apply here.
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#5
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I do have a wide port eheads so maybe it don't apply here. I'm running boost with my junk.
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#6
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I’m using 3/8 pushrods with my standard port E-heads (72cc).
I did drill out the intake port pushrod access holes for 9/16 stainless thin-wall tubing, epoxied them into the ports (nice and secure) and used red Glypyal to coat the entire port so I can run e-85 and not have to worry about the ethanol degrading the epoxy. The other pushrod holes were all drilled out to 9/16. No tubing. No issues. Using T&D shafts with Crower stand shims. |
#7
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Im using 3/8" in mine . Had .090" Milled off one side all the way through and .050" off the other side of the hole and then still had to file it the rest of the way with a 3/8' diameter round file to get .040" to clearance the rod to the head . It took some time but no issues with it hitting .. So the holes are of an oval shape . Theres no need to hog it out ..
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My Half AN Injun..... |
#8
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I have 3/8 pushrods in my wideports...when drilling we got into the port slightly but we welded it up and finished it out...turned out perfect.
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#9
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I'm running 3/8" in mine. Butler opened them up for 1.65 rockers but I ended up using Comp SBC adjustable guide plates as that was all I could get for a 3/8" pushrod over here and spent a fair amount of time setting each rocker up so the pushrod clears and still rides the valve stem properly. Works great on my motor.
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#10
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Have 3/8" pushrods and 1.65 rockers with my first gen Edelbrock round ports. Forgot who warned me to be somewhat careful and only take the necessary cut back towards the rocker stud because the wall was said to be somewhat thin to the coolant area. Had a machine shop oval shape the pushrod holes with the Bridgeport for that reason, but when I changed to a cam with .720/.723 lift I just went in and did the second clearance myself with the die grinder. Didn't have to widen the pushrod hole at all.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
#11
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Ok thanks, I'll clearance the holes in the normal way then (same as my iron heads), just mill/grind back the top half of the holes at an angle towards the rockers. I've smoothed off the port pushrod bulges and I don't want to break through into the ports by running a bigger drill bit through the holes.
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