#41  
Old 07-20-2021, 06:01 PM
Dragncar Dragncar is offline
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96 heads right here ,300$.. Will solve your problem.
https://forums.maxperformanceinc.com...56#post6266056

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  #42  
Old 07-21-2021, 01:39 PM
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MTBE was Much more dense than Alcohol is , so YES, it was easier to make this work in the 90's.
While alcohol does have a higher octane, its not Dense, so More heat is on its way, which doesn't help with knock, or ping.

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Old 07-21-2021, 02:00 PM
69hardtop 69hardtop is offline
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I have a 1970 455 D-port with 64 heads. When we rebuilt it I went with a 15cc dish piston and a 068 Melling cam. My heads ccíd our right around 89-90 so my calculated compression is mid 9ís or so. I run 93 octane all the time with no issues, never really tried anything with a lower octane. I did have it balanced also. Itís pretty smooth, plenty of torque and pulls hardÖI was criticized for not going with a more aggressive cam profile but Iím super happy with results

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Old 07-21-2021, 02:40 PM
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Originally Posted by 69hardtop View Post
I have a 1970 455 D-port with 64 heads. When we rebuilt it I went with a 15cc dish piston and a 068 Melling cam. My heads ccíd our right around 89-90 so my calculated compression is mid 9ís or so. I run 93 octane all the time with no issues, never really tried anything with a lower octane. I did have it balanced also. Itís pretty smooth, plenty of torque and pulls hardÖI was criticized for not going with a more aggressive cam profile but Iím super happy with results
People love to say you didnt build in enough power, but THEY dont buy the gas or pay for the added problems it can cause, especially for a fun driver.
what T stat you run?

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Old 07-21-2021, 02:56 PM
69hardtop 69hardtop is offline
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People love to say you didnt build in enough power, but THEY dont buy the gas or pay for the added problems it can cause, especially for a fun driver.
what T stat you run?
I run a 180 degree thermostat, fan shroud and Hayden heavy duty clutch fan. 12 degrees initial timing with ported vacuum. No cooling issues at allÖ..and I didnít clearance my water pump divider plate because I bought the stainless one and I couldnít get it to move much, and didnít want to use a BFH
64 GTO with M20 and 3.55 rear

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Old 07-21-2021, 06:02 PM
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Pretty sure i use the 180 T-stats for best results. 160 being too cold, and 198 being stoopid hot.

Here's the short block status: Slugs keyed to Rods for thrust surface and valve relief. numbering stamped and sharpied.

Many (6) grandkid interrupts so sharpie keeps the status.
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  #47  
Old 07-21-2021, 06:18 PM
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Gm ( ac delco) makes a 170 T stat I have used for many years as well, just a Fyi

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  #48  
Old 07-21-2021, 10:33 PM
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Working with some serious looking internals for the project. Aluminum rods, look like maybe GRPís? Be a shame to drop the compression with guts like that. Its saying letís ROCKÖ

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Old 07-22-2021, 07:28 AM
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Working with some serious looking internals for the project. Aluminum rods, look like maybe GRPís? Be a shame to drop the compression with guts like that. Its saying letís ROCKÖ
Forged crank, BME Rods (+1 GRP matched replacement). Good block.

Maybe best to trade this Flattop shortblock for a dished 455 shortblock!

  #50  
Old 07-22-2021, 09:53 AM
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67Fbird 67Fbird is offline
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Originally Posted by 69hardtop View Post
I run a 180 degree thermostat, fan shroud and Hayden heavy duty clutch fan. 12 degrees initial timing with ported vacuum. No cooling issues at allÖ..and I didnít clearance my water pump divider plate because I bought the stainless one and I couldnít get it to move much, and didnít want to use a BFH
64 GTO with M20 and 3.55 rear
They BFH is the ONLY way I have gotten the wp plate to move.
I have also carved out a piece of 6x6 and use a little hand press to move it. Past experience has been 1/4" OVER PRESS.(due to memory)...so it lands where you want

  #51  
Old 07-22-2021, 10:02 AM
sdbob sdbob is offline
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I often wonder how much cam,horsepower do you need for the street,I'm 73? My younger days ran the 068 in 389,400,421.i was happy with overall ,mileage,driveability, performance. Now I'm not into street racing or burning off my tires,breakage.i guess im 'stale'.

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  #52  
Old 07-22-2021, 04:57 PM
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I often wonder how much cam,horsepower do you need for the street,I'm 73? My younger days ran the 068 in 389,400,421.i was happy with overall ,mileage,driveability, performance. Now I'm not into street racing or burning off my tires,breakage.i guess im 'stale'.
About 400 hp is fine. Any more up to 500 hp is nice but I don't want any compromise in Reliability, high octance additcions, or valvetrain that won't surivive Summer highway.

I think 550+ hp is not happening on 87-89 octane.

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Sold 2003: 12.00/112MPH/1.61 60'/26"x3.31:1/10"/469 #48/245-255-110LSA/Q-Jet-Torker/3650Lbs//18MPG 94oct
Sold 1994: 11.00/123MPH/1.50 60'/29.5"x4.10:1/10"/469 #48/245-255-110LSA/Dual600s-Wenzler/3250Lbs//94oct
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