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#1481
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The BBC Chevy ones made the best valve pattern. Setup with Butlers recommended pushrods. I got the crower stainless steel
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#1482
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Not understanding so which ones did you use. Crower or BBC ones. Thanks
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#1483
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Crower stainless but for a BBC
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#1484
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Gotcha
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#1485
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Butler recommended the BBC rockers?
.
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. 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 |
#1486
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No they provided the pushrod length necessary. I was overloaded with information I didn’t understand yesterday but basically this is my 2nd go round with this. My Pontiac rockers just never made the grade with these heads but the BBC make the grade perfectly
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#1487
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Quote:
You should ask them about using BBC rockers, see what they say. Bookmark this thread for future reference. .
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. 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 |
The Following User Says Thank You to HWYSTR455 For This Useful Post: | ||
#1488
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Quote:
Already called it after the first motor broke. It's the rockers. Interesting tidbit ... assume for the moment the OP was running the Lunati 712 cam in the ill-fated motor. With 1.7 ratio rockers his lifts were .606"/.623" (I/E). If the rockers were 1.8 ratio, .642"/.660" (I/E). If the cam was the 713 , then .634"/.640" (I/E) w. 1.7 rockers and .671".678" (I/E) w. 1.8 rockers.
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Triple Black 1971 GTO Last edited by NeighborsComplaint; 03-08-2023 at 04:26 PM. |
The Following User Says Thank You to NeighborsComplaint For This Useful Post: | ||
#1489
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Dave - did the builder have Pontic Crower SS on hand as well or just the BB SS Crowers?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
#1490
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Yes he had a few different brands. Caster1 had the same problem with his engine
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#1491
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The only thing that I can think of there’s a distinct possibility The stud placement on those heads are a little off compared to standard placement. Enough so the BBC rocker work perfectly.
I’ve kind of run into this situation before.
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The Following 2 Users Say Thank You to Gach For This Useful Post: | ||
#1492
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They work and I have good geometry, no problems on the test stand
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#1493
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I believe it, and don’t think it had anything to do with the original failure. Like I said I’ve run into this situation before.
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The Following User Says Thank You to Gach For This Useful Post: | ||
#1494
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Wayne said that it had happened on mine and Tommys engage but obviously he had never experienced it with factory parts.
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#1495
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Quote:
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"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
#1496
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FYI,in 1963 pontiac offered 1.75 rockers for it 421 SD heads!I have a half set of NOS ones.Tom
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The Following 2 Users Say Thank You to tom s For This Useful Post: | ||
#1497
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If the geometry is correct, lift not going to matter. As long as the duration doesn’t exceed 200 at .200 lift thats when the issue manifests itself. I doubt his hydraulic roller was.
Here’s what I did fine to be a issue, I’ve found 2 blocks that the lifter bores had hair line crack. Remember certain lifter bore are attached to the block like a cup handle. 2 and #6. I think #2 let go on his block.
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The Following User Says Thank You to Gach For This Useful Post: | ||
#1498
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Yes it was #2
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#1499
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Back on the road. For some reason the hydroboost seems a little spongier than it was before but maybe it’s just my mind playing tricks on me
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
#1500
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Good job.
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