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#1
04-21-2022, 05:20 PM
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Ideas for building a street 455 for my 63 Lemans
I'm slowly working to get my 63 running. I have 2 good 455s. One is a low mileage 74. I'm thinking changing the heads to 6X( I have 16s,96s,7m5, couple sets of 6Xs). Intake if all goes to plan will be the new 'bathtub' intake. Trans will be rebuilt M40 with L88 type convertor. I was wondering if stock (exhaust)6Xs will be good? No cam selected yet,that's another selection I need advice on. I'm thinking(cost) flat tappet hydraulic. I just want nice driver I can have some fun. I could put my spare SD in it but keeping that for spare for other 2 cars. Thanks Bob.
Last edited by sdbob; 04-21-2022 at 05:23 PM. Reason: Change wording |
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#2
04-21-2022, 06:29 PM
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There where two different 96 castings, I am assuming you have the D exh port version and if that’s the case then those are the heads I would rebuild an use on the 455.
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I do stuff for reasons. |
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#3
04-21-2022, 06:35 PM
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Bob,I have a set of 96s on my 62 GP 421 with a bathtub right now.DEAD stock,not even port match.Im running a 068 cam in it and drives great.Tom
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#4
04-21-2022, 07:21 PM
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Ok thank you. Hmm.068 I've used that cam, cheap nos in lot (4)of engines I built in the past. I was thinking high lift 041.Ill need a converter. IllTalk to Cliff when I'm ready.
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#5
04-21-2022, 07:34 PM
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my car is a 4 speed car.3.42 first gear and 2.68 in the back,coming to a rolling type stop I just leave in 2nd gear.Can drive in 4th gear at 1500 RPMs and just feed the throttle.Your car is much lighter.FWIW,Tom
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#6
04-21-2022, 08:19 PM
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Agree 96’s would be best choice.
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#7
04-21-2022, 10:01 PM
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6X heads have hardened exhaust seats, screw in studs, guide plates and the -8 versions are 101cc which makes a little under 9.5 to 1 in a 455 with flat top pistons and tight squish. The -4 version has smaller chambers, most I've checked were right at 92cc, but I'v e seen a few sets as small as 88cc.
96's as mentioned are also a good choice. 7M5 heads are horrible, HUGE chambers and I can't remember finding a set where one or both weren't cracked across the exhaust seats on the two inner exhaust valves.........
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#8
04-22-2022, 09:03 AM
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My 455 (in signature below) is just 8.3:1, unported "66" castings. Still have pressed-in studs, stock rockers & adjusting nuts work fine with the lower-lift cam. Runs cools, uses the cheapest gas I can find. 3.08 gears, stock torque converter. I've only had to track once, and the track was poorly prepped - even with 255/60-15 MT drag radials I was blowing the tires away if I launched with more than about half-throttle. Transmission was screwing up and shifting WAY late, as well. I still ran several 13.2's @ 102.8-104mph, with 60' in the 1.88-1.91 range.
It is a VERY "nice driver" combination, IMHO. My wife even enjoys driving it.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust |
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